USG CORP
S-1, 1994-01-07
CONCRETE, GYPSUM & PLASTER PRODUCTS
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 7, 1994

                                                       REGISTRATION NO. 33-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                                USG CORPORATION
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                          <C>                         <C>
         DELAWARE                       3275                36-3329400
      (State or other            (Primary Standard       (I.R.S. Employer
      jurisdiction of                Industrial           Identification
     incorporation or           Classification Code            No.)
       organization)                  Number)
</TABLE>

                           125 SOUTH FRANKLIN STREET
                          CHICAGO, ILLINOIS 60606-4678
                                 (312) 606-4000
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)
                            ------------------------

                            ARTHUR G. LEISTEN, ESQ.
             SENIOR VICE PRESIDENT - GENERAL COUNSEL AND SECRETARY
                           125 SOUTH FRANKLIN STREET
                          CHICAGO, ILLINOIS 60606-4678
                                 (312) 606-4000
           (Name, address and telephone number of agent for service)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                 <C>
     FRANCIS J. GERLITS, P.C.                 SETH A. KAPLAN
         Kirkland & Ellis             Wachtell, Lipton, Rosen & Katz
     200 East Randolph Drive               51 West 52nd Street
     Chicago, Illinois 60601             New York, New York 10019
</TABLE>

                            ------------------------

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

    If  any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to  Rule 415 under the Securities Act  of
1933, check the following box. / /
                            ------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                                PROPOSED MAXIMUM
 TITLE OF EACH CLASS OF                       PROPOSED MAXIMUM     AGGREGATE         AMOUNT OF
    SECURITIES TO BE          AMOUNT TO        OFFERING PRICE       OFFERING       REGISTRATION
       REGISTERED          BE REGISTERED(1)     PER SHARE(2)        PRICE(2)            FEE
<S>                       <C>                 <C>               <C>               <C>
Common Stock, par value
 $0.10 per share........   9,775,000 shares       $29.625         $289,584,375        $99,857
<FN>
(1) Includes  1,275,000 shares that the Underwriters have the option to purchase
    to cover over-allotments, if any.
(2) Estimated in accordance with Rule 457 solely for the purpose of  calculating
    the registration fee.
</TABLE>

    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT  SHALL THEREAFTER BECOME EFFECTIVE IN  ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT  OF 1933 OR  UNTIL THIS REGISTRATION  STATEMENT SHALL  BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                             CROSS REFERENCE SHEET
                   PURSUANT TO ITEM 501(B) OF REGULATION S-K
  SHOWING LOCATION IN PROSPECTUS OF INFORMATION REQUIRED BY ITEMS OF PART I OF
                                   FORM S-1.

<TABLE>
<CAPTION>
REGISTRATION STATEMENT
ITEM NUMBER AND CAPTION                                                   CAPTION OR LOCATION IN PROSPECTUS
- -------------------------------------------------------------  --------------------------------------------------------
<C>        <S>                                                 <C>
       1.  Forepart of the Registration Statement and Outside
            Front Cover Page of Prospectus...................  Outside Front Cover Page of Prospectus
       2.  Inside Front and Outside Back Cover Pages of
            Prospectus.......................................  Inside Front Cover Page of Prospectus; Outside Back
                                                                Cover Page of Prospectus; Additional Information
       3.  Summary Information, Risk Factors and Ratio of
            Earnings to Fixed Charges........................  Prospectus Summary; Risk Factors
       4.  Use of Proceeds...................................  Purpose of the Offering and Use of Proceeds;
                                                                Management's Discussion and Analysis of Financial
                                                                Condition and Results of Operations
       5.  Determination of Offering Price...................  Not applicable
       6.  Dilution..........................................  Dilution
       7.  Selling Security Holders..........................  Ownership of Common Stock
       8.  Plan of Distribution..............................  Outside Front Cover Page of Prospectus; Underwriting
       9.  Description of Securities to Be Registered........  Prospectus Summary; Dividend Policy; Capitalization;
                                                                Description of Capital Stock
      10.  Interests of Named Experts and Counsel............  Legal Matters
      11.  Information with Respect to the Registrant........  Outside Front Cover Page of Prospectus; Prospectus
                                                                Summary; Risk Factors; Dividend Policy; Purpose of the
                                                                Offering and Use of Proceeds; Capitalization; Dilution;
                                                                Selected Consolidated Financial Data; Management's
                                                                Discussion and Analysis of Financial Condition and
                                                                Results of Operations; Business; Management; Certain
                                                                Relationships and Related Transactions; Description of
                                                                Capital Stock; Legal Matters; Experts; Financial
                                                                Statements
      12.  Disclosure of Commission Position on
            Indemnification for Securities Act Liabilities...  Not Applicable
</TABLE>
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS BE  ACCEPTED  PRIOR  TO  THE  TIME  THE  REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL  OR  A
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THE SECURITIES IN
ANY STATE IN WHICH SUCH OFFER, SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR  TO
REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>

<TABLE>
<S>                <C>                     <C>
PROSPECTUS         SUBJECT TO COMPLETION               [LOGO]
8,500,000 SHARES      JANUARY 7, 1994
USG CORPORATION
COMMON STOCK
($.10 PAR VALUE)
</TABLE>

Of  the 8,500,000  shares of  common stock  ("Common Stock")  being offered (the
"Offering"),  6,000,000  shares   are  being  sold   by  USG  Corporation   (the
"Corporation"  or "USG") and 2,500,000 shares are being sold by a stockholder of
the Corporation (the "Selling Stockholder").  See "Ownership of Common Stock  --
Selling  Stockholder." The Company will not receive any of the proceeds from the
sale of Common Stock by the Selling Stockholder.

The Common Stock is traded on the New York Stock Exchange (the "NYSE") under the
symbol "USG." On January  3, 1994, the  last reported sale  price of the  Common
Stock  as reported on the NYSE Composite  Tape was $29.625 per share. See "Price
Range of Common  Stock." Potential  investors are encouraged  to obtain  current
trading price information.

PROSPECTIVE  INVESTORS SHOULD CONSIDER CAREFULLY THE MATTERS DISCUSSED UNDER THE
CAPTION "RISK FACTORS."

THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  NOR HAS THE SECURITIES
AND EXCHANGE  COMMISSION OR  ANY  STATE SECURITIES  COMMISSION PASSED  UPON  THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

<TABLE>
<S>                          <C>             <C>             <C>             <C>
                                                             PROCEEDS TO     PROCEEDS TO
                             PRICE TO        UNDERWRITING    CORPORATION     SELLING
                             PUBLIC          DISCOUNT        (1)             STOCKHOLDER
Per Share..................  $               $               $               $
Total (2)..................  $               $               $               $
<FN>
(1) Before  deduction of  expenses payable by  the Corporation,  estimated to be
    $810,000.
(2) The Corporation and the Selling Stockholder have granted to the Underwriters
    a 30-day option to purchase up  to 637,500 and 637,500 additional shares  of
    Common  Stock, respectively, at  the Price to  Public, less the Underwriting
    Discount, solely  to  cover over-allotments,  if  any. If  the  Underwriters
    exercise  such  option  in full,  the  total Price  to  Public, Underwriting
    Discount, Proceeds to Corporation and  Proceeds to Selling Stockholder  will
    be             ,           ,             , and           , respectively. See
    "Underwriting."
</TABLE>

The shares of Common Stock are offered subject to receipt and acceptance by  the
Underwriters,  to prior sale and to the  Underwriters' right to reject any order
in whole or in part and to withdraw, cancel or modify the offer without  notice.
It is expected that delivery of the shares will be made at the office of Salomon
Brothers  Inc, Seven  World Trade  Center, New  York, New  York, or  through the
facilities of The Depository Trust Company, on or about           , 1994.

SALOMON BROTHERS INC                                         LAZARD FRERES & CO.
                           SMITH BARNEY SHEARSON INC.

The date of this Prospectus is           , 1994.
<PAGE>
                      [PICTURES TO BE FILED BY AMENDMENT]

    IN CONNECTION WITH THE OFFERING,  THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A  LEVEL  ABOVE THAT  WHICH MIGHT  OTHERWISE  PREVAIL IN  THE OPEN  MARKET. SUCH
STABILIZATION, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

                                       2
<PAGE>
                               PROSPECTUS SUMMARY

    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION AND  FINANCIAL STATEMENTS  (INCLUDING THE  NOTES THERETO)  CONTAINED
ELSEWHERE  IN THIS PROSPECTUS. UNLESS THE CONTEXT OTHERWISE REQUIRES, REFERENCES
TO "USG" AND THE "CORPORATION" MEAN USG CORPORATION, A DELAWARE CORPORATION, AND
ITS SUBSIDIARIES. UNLESS OTHERWISE SPECIFIED,  THE INFORMATION PROVIDED IN  THIS
PROSPECTUS  ASSUMES NO EXERCISE OF  THE UNDERWRITERS' OVER-ALLOTMENT OPTION. SEE
"UNDERWRITING."

                                THE CORPORATION

    Through  its  subsidiaries,  USG  is  a  leading  manufacturer  of  building
materials  in North America which  produces a wide range  of products for use in
residential and nonresidential construction, repair  and remodeling, as well  as
products  used  in certain  industrial processes.  United States  Gypsum Company
("U.S. Gypsum") is the largest producer of gypsum wallboard in the United States
and accounted for  approximately one-third  of total  domestic gypsum  wallboard
sales  in 1992. USG Interiors,  Inc. ("USG Interiors") is  a leading supplier of
interior  ceiling,  wall  and  floor  products  used  primarily  in   commercial
applications.  L&W Supply Corporation ("L&W  Supply") is the largest distributor
of wallboard  and  related  products in  the  United  States and  in  1992  sold
approximately  23% of  U.S. Gypsum's  wallboard production.  In addition  to its
United States  operations,  the Corporation's  76%  owned subsidiary,  CGC  Inc.
("CGC"),  is the largest  manufacturer of gypsum products  in eastern Canada and
the Corporation's USG International unit ("USG International") supplies interior
systems and gypsum wallboard products in Europe, the Pacific and Latin  America.
In  the nine months ended  September 30, 1993, the  Corporation had net sales of
$1.4 billion and generated  EBITDA of $165 million.  In the year ended  December
31,  1992, the Corporation had net sales of $1.8 billion and generated EBITDA of
$159 million.

    The Corporation believes that  its leading industry  positions and low  cost
structure  position it to take advantage of the long term potential in its three
industry segments:  Gypsum  Products,  Interior Systems  and  Building  Products
Distribution.

    GYPSUM  PRODUCTS.   U.S.  Gypsum  has vertically  integrated  operations for
extracting, processing,  producing and  marketing gypsum  and related  products,
such  as  "SHEETROCK"  brand  wallboard, joint  compound  and  industrial gypsum
cements and fillers. U.S. Gypsum also manufactures cement board, which it  sells
under  the "DUROCK" brand name.  Due to the vertical  integration of its key raw
materials (gypsum and paper), its technical  expertise and the proximity of  its
plants to major metropolitan areas, U.S. Gypsum believes that its delivered cost
for  gypsum wallboard is generally  lower than its competitors'.  As a result of
efficiency  improvements  and  cost   reduction  efforts,  U.S.  Gypsum's   unit
manufacturing  cost for gypsum  wallboard in 1992  (measured in nominal dollars)
was lower than its unit  manufacturing cost in 1982,  despite a 28% increase  in
the  United States producer  price index for  construction materials during this
period. In the year ended December 31, 1992, the Gypsum Products segment had net
sales of $1.1 billion and generated EBITDA of $123 million before allocation  of
corporate expenses.

    INTERIOR  SYSTEMS.  The Interior Systems segment manufactures and markets an
integrated line of  products used primarily  for commercial interiors.  Products
include  ceiling grid and  ceiling tile, access floor  systems, wall systems and
mineral wool insulation and soundproofing  products. In 1992, USG Interiors  was
the  leading producer of ceiling grid and the second largest producer of ceiling
tile in  the  United States,  accounting  for over  one-half  and  approximately
one-third  of total  domestic sales of  such products, respectively.  CGC is the
largest producer of ceiling grid and the second largest marketer of ceiling tile
in Canada. Through USG International, the Interior Systems segment has a growing
presence in Europe, the  Pacific and Latin America.  In the year ended  December
31,  1992,  the Interior  Systems  segment had  net  sales of  $548  million and
generated EBITDA of $59 million before allocation of corporate expenses.

    BUILDING PRODUCTS DISTRIBUTION.  The Building Products Distribution  segment
is  conducted through  L&W Supply, which  accounted for approximately  9% of all
gypsum  wallboard  sold  in  the  United  States  in  1992.  L&W  Supply's   130
distribution  centers  located  in 33  states  offer  a wide  range  of building
products

                                       3
<PAGE>
to construction contractors, including wallboard, ceiling tile and ceiling grid.
L&W Supply  is able  to  provide less  than  truckload quantities  of  materials
directly  to  job  sites and  place  the materials  in  areas where  work  is in
progress,  thereby  reducing  contractors'   material  handling  and   inventory
requirements.  In  the  year  ended December  31,  1992,  the  Building Products
Distribution segment had net  sales of $464 million  and generated EBITDA of  $5
million before allocation of corporate expenses.

    U.S.  INDUSTRY TRENDS.  Demand for  the Corporation's products in the United
States is largely influenced by the  three major components of the  construction
industry:  new  residential construction  (single  and multi-family  homes), new
non-residential construction (offices, schools,  stores and other  institutions)
and  repair  and  remodel  activity.  In  recent  years,  structural  changes in
residential construction activity combined with growth in the repair and remodel
component have partially mitigated the impact of the cyclical demand in  overall
new  construction components.  New residential  construction has  shifted toward
more single family housing, which typically requires twice as much wallboard  as
a  multi-family home, and the  average single family home  size has increased by
approximately 17% since 1985.  In addition, the repair  and remodel segment  has
become  an increasing  percentage of the  Corporation's business.  For 1992, the
Corporation  estimates   that  the   repair   and  remodel   segment   comprised
approximately  36%  of  1992  industry-wide  demand  for  gypsum  wallboard  and
approximately half  of  industry-wide  demand  for  interior  systems  products.
Largely as a result of these factors, United States industry shipments of gypsum
wallboard  were 20.3 billion square feet in 1992, as compared to 20.1 billion in
1985, despite an approximate  31% decline in the  number of housing starts  from
1.7 million units in 1985 to 1.2 million units in 1992.

    Industry  shipments of  gypsum wallboard  during the  nine months  and three
months ended  September  30,  1993  were  4%  and  5%  higher  than  during  the
corresponding  periods  in 1992,  respectively.  The Corporation  estimates that
industry capacity utilization for gypsum wallboard has increased from an average
of approximately 83% during 1992 to over  90% during the third quarter of  1993,
with  U.S.  Gypsum  operating at  over  90%  of capacity.  USG's  average gypsum
wallboard price increased  to $80.70  per thousand  square feet  ("MSF") in  the
three  months ended September 30, 1993, as compared to its 14 year low of $67.77
reached in the three months ended March 31, 1992.

    The Corporation's  principal  executive offices  are  located at  125  South
Franklin  Street, Chicago, Illinois 60606. Its  telephone number at that address
is 312-606-4000.

                               THE RESTRUCTURING

    On May 6, 1993, the  Corporation completed a comprehensive restructuring  of
its  debt (the  "Restructuring") through  the implementation  of a "prepackaged"
plan of reorganization under the federal bankruptcy laws. In the  Restructuring,
the  Corporation (i) converted  approximately $1.4 billion  of subordinated debt
and accrued interest into  Common Stock and warrants  to purchase Common  Stock,
(ii)  converted approximately $340 million of  its bank obligations into 10 1/4%
Senior Notes due 2002 ("Senior 2002 Notes") and (iii) extended the maturities of
its  remaining  bank   debt  and   certain  public  debt.   Subsequent  to   the
Restructuring,  the Corporation also completed  an exchange offer that converted
an additional $138 million  of bank debt into  Senior 2002 Notes and  eliminated
all scheduled bank debt amortization prior to December 31, 1997. Taken together,
the Restructuring and the subsequent exchange of bank debt for Senior 2002 Notes
significantly  reduced  the Corporation's  overall  interest and  debt repayment
obligations and  extended  the  maturities  of  a  substantial  portion  of  its
remaining debt.

                  PURPOSE OF THE OFFERING AND USE OF PROCEEDS

    The  Offering is part of a refinancing  strategy which also includes (i) the
placement (the "Note Placement") of $150 million principal amount of new  senior
notes  due 2001 (the  "Senior 2001 Notes")  with certain institutional investors
and (ii) the  amendment of USG's  bank credit agreement  (the "Credit  Agreement
Amendments"  and,  together  with  the  Offering  and  the  Note  Placement, the
"Transactions"). The Credit Agreement Amendments will, among other things, amend
existing mandatory bank term loan

                                       4
<PAGE>
prepayment provisions  so as  to  allow USG,  upon  the achievement  of  certain
financial  tests, to retain  additional free cash  flow for capital expenditures
and the  purchase  of its  public  debt.  The Credit  Agreement  Amendments  are
contingent on the consummation of the Offering.

    USG  expects to use a portion of the  net proceeds from the Offering and the
Note Placement,  together  with  approximately $150  million  of  existing  cash
generated  from operations, to pay $140 million  of its bank debt and to redeem,
at 100% of principal amount,  $75 million of its 8%  Senior Notes due 1995  (the
"Senior  1995  Notes") and  $35 million  of its  9% Senior  Notes due  1998 (the
"Senior 1998 Notes"). The Corporation also expects  to use a portion of the  net
proceeds  to  purchase up  to a  total of  approximately $128  million aggregate
principal amount of its outstanding 8%  Senior Notes due 1996 (the "Senior  1996
Notes") and 8% Senior Notes due 1997 (the "Senior 1997 Notes"). The remainder of
the  net proceeds  will be available  for general  corporate purposes, including
capital expenditures for cost reduction, capacity improvement and future  growth
opportunities.

    Sources  and  uses of  funds  in the  Transactions  are estimated  to  be as
follows:

<TABLE>
<CAPTION>
                                                                           (DOLLARS IN MILLIONS)
<S>                                                                        <C>
Sources:
  The Offering, net of the estimated underwriting discount and
   expenses..............................................................        $     169
  The Note Placement.....................................................              150
  Cash on hand...........................................................              150
                                                                                     -----
                                                                                 $     469
                                                                                     -----
                                                                                     -----
Uses:
  Payment of bank debt...................................................        $     140
  Redemption of Senior 1995 Notes and Senior 1998 Notes..................              110
  Purchase of Senior 1996 Notes and Senior 1997 Notes....................              128
  General corporate purposes.............................................               91
                                                                                     -----
                                                                                 $     469
                                                                                     -----
                                                                                     -----
</TABLE>

    Collectively, the  Transactions are  designed, among  other things,  to  (i)
reduce  the  Corporation's financial  leverage, (ii)  reduce  the amount  of the
Corporation's debt  maturing  in  1995  through 1998,  (iii)  extend  the  final
maturity  of a significant  portion of the Corporation's  debt, (iv) improve the
Corporation's  financial  and  operating  flexibility  under  its  bank   credit
agreement   and  (v)   provide  funds   for  general   corporate  purposes.  See
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations  -- Liquidity and Capital Resources" and "Purpose of the Offering and
Use of Proceeds."

                                       5
<PAGE>
                                  THE OFFERING

<TABLE>
<S>                                 <C>
Common Stock offered by:
  The Corporation.................  6,000,000 shares
  The Selling Stockholder.........  2,500,000 shares
    Total.........................  8,500,000 shares
Common Stock outstanding (a):
  Prior to the Offering...........  37,158,085
  After the Offering..............  43,158,085
Use of Proceeds...................  Payment of indebtedness and general corporate  purposes,
                                    including   capital  expenditures  for  cost  reduction,
                                    capacity improvement  and future  growth  opportunities.
                                    See "Purpose of the Offering and Use of Proceeds."
NYSE Symbol.......................  USG
<FN>
- ------------------------
(a) Does  not include (i) warrants  to purchase up to  an aggregate of 2,601,619
    shares of  Common Stock  which are  immediately exercisable  at a  price  of
    $16.14  per share and (ii)  options held by management  to purchase up to an
    aggregate of 1,673,000 shares of Common Stock which will become  exercisable
    at  a  price of  $10.3125  per share  in the  years  1994 through  1996. See
    "Management -- Executive Compensation and Benefits."
</TABLE>

                                       6
<PAGE>
                         SUMMARY FINANCIAL INFORMATION
       (Dollars in millions, except per share data and wallboard prices)

    The following tables present summary historical financial data, summary  pro
forma financial data and certain other information. Due to the Restructuring and
implementation of fresh start accounting, financial statements subsequent to May
6,  1993 are not  comparable to financial  statements for periods  prior to that
date. Accordingly, a vertical line has been added to separate such  information.
The  information  in the  tables should  be read  in conjunction  with "Selected
Consolidated Financial Data," "Management's Discussion and Analysis of Financial
Condition  and  Results  of  Operations,"  "Pro  Forma  Condensed   Consolidated
Financial  Information" and the  Corporation's Consolidated Financial Statements
and notes thereto, all of which  are included elsewhere in this Prospectus.  See
"Index to Consolidated Financial Statements and Supplemental Data."

    The  unaudited pro  forma income  statement data  for the  nine months ended
September 30, 1993 and the  year ended December 31,  1992 and the unaudited  pro
forma  balance  sheet data  as of  September 30,  1993 were  prepared as  if the
Transactions had occurred on January 1, 1993, January 1, 1992 and September  30,
1993,  respectively. The unaudited pro forma  income statement data reflects the
implementation of  the  Restructuring, including  the  adoption of  fresh  start
accounting  prescribed by AICPA Statement of  Position 90-7, and the issuance of
$138 million in aggregate principal amount of Senior 2002 Notes in exchange  for
bank  debt as  if those transactions  had also  occurred on January  1, 1993 and
January 1,  1992, respectively.  The unaudited  pro forma  financial data  shown
below  does not purport to be indicative of the results of operations that would
actually have been reported had  such transactions actually been consummated  on
such  dates  or  of  the results  of  operations  that may  be  reported  by the
Corporation in  the future.  For  additional detail,  see "Pro  Forma  Condensed
Consolidated Financial Information."

HISTORICAL INFORMATION

<TABLE>
<CAPTION>
                                                                       NINE
                                                                      MONTHS
                                      MAY 7 THROUGH     JANUARY 1     ENDED        YEARS ENDED DECEMBER 31
                                      SEPTEMBER 30     THROUGH MAY   SEPTEMBER  ------------------------------
                                          1993          6 1993(A)    30 1992      1992       1991       1990
                                     ---------------   -----------   --------   --------   --------   --------
INCOME STATEMENT DATA:
<S>                                  <C>               <C>           <C>        <C>        <C>        <C>
  Net sales........................        $ 829         $ 591        $1,341     $1,777     $1,712     $1,915
  Gross profit.....................          168           109           246        317        327        416
  Amortization of excess
   reorganization value............           71            --            --         --         --         --
  Operating profit.................            5            38            87         99        133        195
  Interest expense.................           56            86           253        334        333        292
  Interest income..................           (3)           (2)           (8)       (12)       (11)        (8)
  Other (income)/expense, net......           (6)            6            --          1          5          5
  Reorganization items.............           --          (709)(b)        --         --         --         --
  Net earnings/(loss)..............          (46)(c)     1,434          (131)      (191)      (161)       (90)
  Average number of common shares
   (d).............................   37,157,477
  Net loss per common share (d)....        (1.23)(c)
  Dividends paid per common share
   (d).............................           --
BALANCE SHEET DATA (as of the end
 of the period):
  Total assets.....................        2,186         2,194         1,676      1,659      1,626      1,675
  Total debt.......................        1,543(e)      1,555(e)      2,706      2,711      2,660      2,600
  Total stockholders'
   equity/(deficit)................          (52)            4        (1,812)    (1,880)    (1,680)    (1,518)
OTHER INFORMATION:
  EBITDA (f).......................          102            63           132        159        194        280
  Capital expenditures.............           16            12            27         49         49         64
  Gross margin (g).................         20.3%         18.4%         18.3%      17.8%      19.1%      21.7%
  EBITDA margin (h)................         12.3          10.7           9.8        8.9       11.3       14.6
  Gypsum wallboard shipments: (i)
    Total U.S. Industry............          9.2           6.7          15.3       20.3       18.4       20.7
    U.S. Gypsum....................          3.1           2.3           5.4        7.2        6.6        7.2
  U.S. Gypsum wallboard price
   (j).............................       $79.41        $75.81        $71.01     $71.58     $72.53     $79.08
</TABLE>

                                       7
<PAGE>
PRO FORMA INFORMATION

<TABLE>
<CAPTION>
                                                                      NINE     YEAR
                                                                     MONTHS    ENDED
                                                                      ENDED   DECEMBER
                                                                    SEPTEMBER   31,
                                                                    30, 1993   1992
                                                                    --------- -------
<S>                                                                 <C>       <C>
INCOME STATEMENT DATA:
  Operating profit/(loss)........................................... $  (14)  $  (66)
  Interest expense..................................................     86      116
  Interest income...................................................     (5)     (10)
  Other (income)/expense, net.......................................     (1)      (5)
  Earnings/(loss) before extraordinary gain and changes in
   accounting principles (k)........................................   (100)    (188)
  Earnings/(loss) before extraordinary gain and changes in
   accounting principles per common share (k).......................  (2.28)   (4.34)
BALANCE SHEET DATA (as of the end of the period):
  Total assets......................................................  2,126
  Total debt........................................................  1,315(l)
  Total stockholders' equity/(deficit)..............................    103
OTHER INFORMATION:
  EBITDA (f)........................................................    165      159
  Amortization of excess reorganization value.......................    128      170
<FN>
- ------------------------------
(a) Fresh start accounting adjustments were recorded on May 6, 1993.
(b) Reflects  one-time gain from reorganization items, including an $851 million
    gain from recording reorganization value  in excess of identifiable  assets,
    partially  offset  by  other  fresh  start  adjustments,  fees  and expenses
    associated with  the Restructuring  and a  write-off of  deferred  financing
    costs associated with the 1988 Recapitalization.
(c) For  the period of May 7 through  September 30, 1993, amortization of excess
    reorganization  value  and  reorganization  discount  reduced  reported  net
    earnings by $75 million, or $2.03 per share.
(d) Common  shares and per share data for periods prior to May 7, 1993 have been
    omitted because, due to the Restructuring and implementation of fresh  start
    accounting, they are not meaningful.
(e) Total  debt  as of  September  30 and  May 6,  1993  are shown  at principal
    amounts. The carrying amounts  (net of unamortized reorganization  discount)
    as  reflected  on the  Corporation's balance  sheets as  of those  dates are
    $1,453 million and $1,461 million, respectively.
(f) EBITDA represents earnings before interest, taxes, depreciation,  depletion,
    amortization,   non-cash   postretirement  charges,   reorganization  items,
    extraordinary  gain,  discontinued  operations  and  changes  in  accounting
    principles. The Corporation believes EBITDA is helpful in understanding cash
    flow generated from operations that is available for taxes, debt service and
    capital  expenditures.  In addition,  EBITDA  facilitates the  monitoring of
    covenants related to  certain long-term  debt and  other agreements  entered
    into in conjunction with the Restructuring.
(g) Gross profit as a percentage of net sales.
(h) EBITDA as a percentage of net sales.
(i) In billions of square feet.
(j) Represents  average price per  thousand square feet  realized by U.S. Gypsum
    during the periods shown.
(k) For pro  forma nine  months ended  September  30, 1993  and the  year  ended
    December   31,  1992,  amortization  of   excess  reorganization  value  and
    reorganization discount reduced pro forma  net earnings by $134 million  and
    $177  million,  respectively,  or  $3.11  per  share  and  $4.10  per share,
    respectively.
(l) Total pro forma  debt as of  September 30,  1993 is shown  at the  principal
    amount.  The carrying amount (net of unamortized reorganization discount) as
    reflected on  the  Pro Forma  Condensed  Consolidated Balance  Sheet  as  of
    September 30, 1993 is $1,246.
</TABLE>

                                       8
<PAGE>
                                  RISK FACTORS

    PROSPECTIVE  PURCHASERS OF THE  COMMON STOCK OFFERED  HEREBY SHOULD CONSIDER
CAREFULLY THE FACTORS  SET FORTH  BELOW, AS WELL  AS THE  OTHER INFORMATION  SET
FORTH IN THIS PROSPECTUS.

HIGH LEVERAGE

    The  Corporation  will  remain  highly  leveraged  upon  completion  of  the
Transactions. As  of September  30,  1993, the  Corporation had  $1,543  million
principal amount of total debt (which had a carrying amount of $1,453 million on
the  Corporation's  balance  sheet  after  deducting  unamortized reorganization
discount of $90 million) and stockholders' equity/(deficit) of ($52) million. As
adjusted to  reflect  the  Offering  and  the debt  repayments  to  be  made  in
connection  with the Transactions,  the Corporation's total  principal amount of
debt and stockholders' equity  as of September 30,  1993 would have been  $1,315
million  and $103 million, respectively. However, the Corporation is expected to
have a deficit  in stockholders'  equity at least  during the  period from  1993
through  1998 when reorganization value in excess of identifiable assets will be
amortized. See "Risk Factors -- Recent Losses," "Selected Consolidated Financial
Data," "Purpose of the Offering and Use of Proceeds" and "Capitalization."

    The degree to which the Corporation is leveraged will pose risks to  holders
of  the  Common Stock,  including,  but not  limited  to, the  following:  (i) a
significant portion  of the  Corporation's  cash flow  from operations  will  be
dedicated  to the payment of principal and interest on its indebtedness, thereby
reducing the funds  available to the  Corporation for its  operations; (ii)  the
Corporation's  ability to obtain additional financing  in the future for working
capital, capital expenditures, acquisitions, general corporate purposes or other
purposes will be restricted; (iii)  certain of the Corporation's borrowings  are
and  will continue to  carry variable rates  of interest, which  could result in
higher interest expense in the event of an increase in interest rates; and  (iv)
certain  indebtedness contains financial and  restrictive covenants, the failure
to comply with which may  result in an event of  default which, if not cured  or
waived, could have a material adverse effect on the Corporation. These and other
factors  could have  material adverse  effects on  the marketability,  price and
future value of the Common Stock.

LIQUIDITY; RELIANCE ON RECOVERY IN CONSTRUCTION-BASED MARKETS

    The Corporation believes that cash generated by operations and the estimated
levels of liquidity available  to the Corporation will  be sufficient to  permit
the  Corporation  to satisfy  its debt  service  requirements and  other capital
requirements for the foreseeable future. However, the Corporation is subject  to
significant business, economic and competitive uncertainties that are beyond its
control.  In particular, the  Corporation's ability to  satisfy its debt service
requirements and other capital requirements will require the continuation of the
recovery in the construction-based markets which began in 1992. Therefore, there
can  be  no  assurance  that  the  Corporation's  financial  resources  will  be
sufficient for the Corporation to satisfy its debt service obligations and other
capital  requirements. See "Risk Factors -- Cyclical Business" and "Management's
Discussion and  Analysis of  Financial Condition  and Results  of Operations  --
Liquidity and Capital Resources."

RECENT LOSSES

    During  the period  from May 7  through September 30,  1993, the Corporation
reported a net  loss of $46  million after  the amortization of  $71 million  of
reorganization  value in excess of  identifiable assets. The Corporation expects
to report net  losses at least  until its excess  reorganization value is  fully
amortized  in 1998.  Such amortization  will be  $170 million  per year  in 1994
through 1997 and  $57 million  in 1998. Although  a significant  portion of  the
Corporation's  recent net losses are the result  of non-cash items, there can be
no assurance that the Corporation will have net income in the future.

CYCLICAL BUSINESS

    The Corporation's business is cyclical in nature and sensitive to changes in
general economic conditions, including, in particular, conditions in the housing
and construction-based markets. As a result of this cyclicality, the Corporation
has experienced and in the future could experience reduced revenues and margins,
which  may  affect  the  Corporation's  ability  to  satisfy  its  debt  service
obligations  on a timely basis. See  "Business" and "Management's Discussion and
Analysis of Financial Condition and

                                       9
<PAGE>
Results of  Operations." During  1992, a  modest recovery  in the  Corporation's
markets  was evidenced by increases in  housing starts and wallboard pricing and
shipments, in addition to  improvement in sales  of other construction  products
over  1991. This recovery continued in 1993.  However, there can be no assurance
that the modest recovery which began in 1992 will continue.

NONCOMPARABILITY OF HISTORICAL FINANCIAL INFORMATION

    As a result of  the adoption of fresh  start accounting upon emergence  from
bankruptcy,  the  Corporation's assets  and  liabilities were  adjusted  to fair
values and retained  earnings were  restated to zero.  The historical  financial
information  presented herein should not, therefore,  be viewed as indicative of
the  Corporation's  future  financial  performance.  For  a  discussion  of  the
Corporation's results of operations since emergence from Chapter 11 proceedings,
see  "Management's Discussion and Analysis of Financial Condition and Results of
Operations."

ASBESTOS LITIGATION

    One of  the  Corporation's subsidiaries,  U.S.  Gypsum, is  a  defendant  in
asbestos  lawsuits alleging  property damage  (the "Property  Damage Cases") and
personal injury (the "Personal Injury  Cases") and seeking compensatory and,  in
many  cases, punitive damages. This litigation has  not had a material effect on
the Corporation's liquidity  or earnings. To  date, virtually all  costs of  the
Personal Injury Cases have been paid by insurance. U.S. Gypsum estimates that it
is  probable that the Personal Injury Cases  pending at December 31, 1992 can be
disposed of for an amount between $80 million and $100 million, virtually all of
which is expected  to be  paid by  insurance. U.S. Gypsum  is unable  to make  a
reasonable  estimate of  the cost  of disposing  of its  pending Property Damage
Cases, some of which  are class actions or  involve multiple buildings. Many  of
U.S.  Gypsum's insurance carriers  are denying coverage  for the Property Damage
Cases, although U.S. Gypsum  believes that substantial  coverage exists and  the
trial  court in U.S. Gypsum's insurance  coverage action (the "Coverage Action")
against its carriers has so ruled (such ruling has been appealed).

    In view of the limited insurance funding currently available to U.S.  Gypsum
for Property Damage Cases resulting from continued resistance by a number of its
insurers  to providing  coverage, the effect  of the asbestos  litigation on the
Corporation will depend upon a variety of factors, including the damages  sought
in  Property  Damage Cases  that  reach trial  prior  to the  completion  of the
Coverage Action, U.S.  Gypsum's ability  to successfully defend  or settle  such
cases,  and the resolution  of the Coverage  Action. As a  result, management is
unable to determine whether an adverse  outcome in the asbestos litigation  will
have  a material adverse effect on the results of operations or the consolidated
financial position  of the  Corporation.  The Corporation's  independent  public
accountants have also noted this uncertainty in their report with respect to the
financial statements of the Corporation. See "Business -- General Information --
Asbestos  Litigation"  and  "Consolidated  Financial  Statements  --  Report  of
Independent Public Accountants."

CREDIT AGREEMENT AND OTHER RESTRICTIONS

    The Credit Agreement contains  restrictions on the Corporation's  operations
including, among other things, limitations on the ability of the Corporation and
certain  subsidiaries  to incur  additional  indebtedness, to  create,  incur or
permit the existence  of certain  liens, to  make certain  investments, to  make
capital  expenditures above certain levels, to  make certain sales of assets, to
make certain  payments with  respect  to outstanding  stock  and debt,  to  give
certain  guarantees, to  effect certain  fundamental changes  and to  enter into
certain types  of transactions.  Although the  Credit Agreement  Amendments  are
designed  to increase the  Corporation's financial and  operating flexibility in
certain  regards,  the  foregoing   restrictions  will  nonetheless  limit   the
Corporation's  ability to respond  to opportunities or  changes in its business.
See "Description Of Credit Agreement."

    In addition, after January  1, 1995, the Credit  Agreement will require  the
Corporation  to achieve and  maintain certain financial  ratios and tests. There
can be no assurance that  the Corporation will be  able to achieve and  maintain
compliance  with the prescribed financial ratios and tests or other requirements
under the Credit Agreement. Failure to achieve or maintain compliance with  such
financial  ratios and  tests or  other requirements  under the  Credit Agreement
would result in a default that could lead to the

                                       10
<PAGE>
acceleration of the  Corporation's obligations  under the  Credit Agreement.  An
acceleration under the Credit Agreement would in turn permit the acceleration of
other indebtedness of the Corporation. The acceleration of any such indebtedness
would result in its becoming immediately due and payable and could result in the
Corporation  becoming subject to a proceeding under the federal bankruptcy laws.
See "Description Of Credit Agreement."

    In addition  to  the restrictions  and  covenants contained  in  the  Credit
Agreement,  the Senior  2002 Notes  contain restrictions  on the  ability of the
Corporation and  the  Subsidiaries  to incur  additional  indebtedness,  to  pay
dividends  on the  Common Stock,  to effect  certain fundamental  changes and to
enter into certain types of transactions. See "Description of Credit  Agreement"
and "Description of Other Debt Obligations."

RESTRICTIONS ON COMMON STOCK DIVIDENDS

    The  Corporation  anticipates that  no cash  dividends will  be paid  on the
Common Stock for the foreseeable  future. Further, the Corporation's ability  to
pay  cash dividends  on the  Common Stock  is restricted  under a  number of the
Corporation's  existing  agreements.  See  "Dividend  Policy,"  "Description  of
Capital Stock," "Description of Credit Agreement" and "Description of Other Debt
Obligations."

ANTITAKEOVER PROVISIONS

    The   Corporation's   Certificate   of   Incorporation,   the  Corporation's
Shareholder Rights  Plan  and  the  Delaware  General  Corporation  Law  contain
provisions  that could  have the effect  of delaying  or preventing transactions
that result in a change of control of the Corporation, including transactions in
which stockholders  might  otherwise receive  a  substantial premium  for  their
shares   over  then  current  market  prices,  and  may  limit  the  ability  of
stockholders to approve  transactions that  they may deem  to be  in their  best
interests. See "Description of Capital Stock."

FUTURE SALES OF COMMON STOCK

    Water Street Corporate Recovery Fund I, L.P. ("Water Street"), together with
its  affiliates  Goldman,  Sachs  &  Co.  and  The  Goldman  Sachs  Group,  L.P.
(collectively the "Water Street Entities"), beneficially owned 16,105,840 shares
of Common Stock (including 116,070 warrants), or approximately 43% of the Common
Stock outstanding  as  of December  31,  1993.  Water Street  proposes  to  sell
2,500,000  shares  of Common  Stock in  the Offering.  Upon consummation  of the
Offering, the Water Street Entities  will beneficially own 13,605,840 shares  of
Common  Stock (including 116,070  warrants), or approximately  32% of the Common
Stock to be outstanding after the Offering. Goldman, Sachs & Co. is the  general
partner  of Water Street.  Messrs. Zubrow and  Fetzer, who are  directors of the
Corporation, are general partners of Goldman, Sachs & Co.

    On February 25, 1993, the Corporation  entered into a letter agreement  with
the  Water  Street Entities  (the "Water  Street  Agreement"). The  Water Street
Agreement, among other things,  (i) restricts purchases of  Common Stock by  the
Water  Street  Entities; (ii)  governs voting  by the  Water Street  Entities of
shares of Common Stock beneficially owned by them; (iii) restricts transfers  by
the  Water Street Entities of  shares of Common Stock  to any person, except for
(a) sales  consistent  with  Rule  144  of  the  Securities  Act  of  1933,  (b)
underwritten  public  offerings, (c)  persons not  known to  be 5%  holders, (d)
pledgees who  agree  to be  bound  by certain  provisions  of the  Water  Street
Agreement,  (e) in  the case  of Water  Street, distributions  to Water Street's
partners in accordance with the governing partnership agreement, (f) pursuant to
certain tender or exchange offers for shares of Common Stock and (g) pursuant to
transactions approved  by  the  Board;  (iv)  requires  that  the  Corporation's
Shareholder  Rights Plan  provide temporary  exemptions for  ownership of Common
Stock by the  Water Street  Entities; and (v)  provides Water  Street with  four
demand  registrations and unlimited piggyback  registrations, subject to certain
limitations. During the 180-day period after the effective date of the Offering,
Water Street (and any Water Street Entity that receives a distribution of Common
Stock from Water Street and  owns 5% or more of  the then outstanding shares  of
Common Stock) shall not request a demand registration of Common Stock. Except in
the case of the Offering, the Corporation and Water Street have mutual piggyback
rights on registrations initiated by either, generally on a 50-50 basis.

                                       11
<PAGE>
    There can be no assurance as to what effect future sales by the Water Street
Entities  would have on the trading markets for the Common Stock. See "Ownership
of Common Stock" and "Certain Relationships and Related Transactions."

                               THE RESTRUCTURING

    In July 1988, the  Corporation consummated a  plan of recapitalization  (the
"1988 Recapitalization") in part in response to an unsolicited takeover attempt.
Approximately  $2.5  billion in  new  debt was  incurred  by the  Corporation to
finance the  1988 Recapitalization,  pay related  costs and  repay certain  debt
existing  at  that  time.  The  1988  Recapitalization  immediately  changed the
Corporation's capital structure to one that was highly leveraged. At the time of
the  1988  Recapitalization,  the  Corporation  projected  that  it  would  have
sufficient  cash flows to meet its debt  service obligations in a timely manner.
However, the Corporation was  adversely affected by a  cyclical downturn in  its
construction-based  markets  which resulted  in  the Corporation's  inability to
achieve projected operating results  and service certain  debt obligations in  a
timely manner.

    On  May  6,  1993  (the "Effective  Date"),  the  Corporation  completed the
Restructuring  through   the  implementation   of   a  "prepackaged"   plan   of
reorganization  (the "Prepackaged Plan") which was confirmed under Chapter 11 of
Title 11 of the United States Code (the "Bankruptcy Code") by the United  States
Bankruptcy  Court for the District of  Delaware. The principal components of the
Restructuring were:

       - Conversion of  approximately $1.4 billion  of subordinated  debt
       and  accrued interest  into approximately  36.1 million  shares of
        Common Stock and warrants  to purchase approximately 2.6  million
        additional shares of Common Stock.

       -  Extension of the maturity of the Corporation's bank obligations
       through the issuance of approximately $340 million of Senior  2002
        Notes,  approximately $56  million aggregate  principal amount of
        capitalized interest notes and approximately $540 million of term
        loans  with  mandatory  amortizations  from  1994  to  2000;  the
        implementation  of  mandatory  prepayment provisions  and  a cash
        sweep mechanism;  and the  extension  of the  Corporation's  then
        existing revolving credit facility through July 13, 1998.

       - Extension of the maturity of $100 million of senior notes due in
       1991  and $10 million of Senior 1996 Notes through the issuance of
        $75 million of Senior 1995 Notes  and $35 million of Senior  1998
        Notes.

Substantially  all other  obligations of  the Corporation  and its subsidiaries,
including obligations arising out of asbestos litigation and certain other legal
proceedings against the Corporation  or its subsidiaries,  were not affected  by
the  Restructuring  and  remained  outstanding. See  "Risk  Factors  -- Asbestos
Litigation," "Business  --  General  Information  --  Asbestos  Litigation"  and
"Management's  Discussion  and Analysis  of Financial  Condition and  Results of
Operations -- Projected Liquidity."

    Subsequent to the Restructuring, on  August 10, 1993 the Corporation  issued
$138 million of additional Senior 2002 Notes in exchange for $92 million of bank
term loans and $46 million of capitalized interest notes. In connection with the
issuance  of the additional  Senior 2002 Notes, USG's  bank credit agreement was
modified as follows: (i) scheduled bank term loan amortization payments totaling
$95 million due in 1994, 1995 and 1996 were eliminated ($3 million was added  to
the  final maturity  of the  bank term  loan due  in 2000);  (ii) $9  million of
capitalized interest notes originally due in 1998 were paid; and (iii) the  cash
sweep  mechanism was modified to permit the application of up to $165 million of
cash otherwise subject to  the cash sweep  mechanism in 1994,  1995 and 1996  to
repayment  or purchase of senior debt due prior  to January 1, 1999 or bank term
loans, at the discretion of the Corporation.

                                       12
<PAGE>
                  PURPOSE OF THE OFFERING AND USE OF PROCEEDS

    The net proceeds to  the Corporation from the  Offering are estimated to  be
approximately  $169 million (or $187 million if the Underwriters' over-allotment
option is exercised in full), based on an assumed offering price of $29.625  per
share  (the last reported sale  price of the Common  Stock on the NYSE Composite
Tape on  January  3,  1994),  and after  deducting  the  estimated  underwriting
discount and offering expenses.

    The  Offering is part of a refinancing  strategy which also includes (i) the
placement of $150  million principal amount  of Senior 2001  Notes with  certain
institutional  investors in the  Note Placement and (ii)  the amendment of USG's
bank credit agreement (the "Credit Agreement"). The Credit Agreement  Amendments
will,  among other  things, amend existing  bank term  loan mandatory prepayment
provisions so as to allow USG, upon the achievement of certain financial  tests,
to retain additional free cash flow for capital expenditures and the purchase of
its  public  debt.  The  Credit  Agreement  Amendments  are  contingent  on  the
consummation of the Offering.

    USG expects to use a portion of  the net proceeds from the Offering and  the
Note  Placement,  together  with  approximately $150  million  of  existing cash
generated from operations, to pay $140 million  of its bank debt and to  redeem,
at  100%  of principal  amount, $75  million of  its Senior  1995 Notes  and $35
million of its Senior 1998 Notes. The Corporation also expects to use a  portion
of  the net  proceeds to purchase  up to  a total of  approximately $128 million
aggregate principal amount of its outstanding Senior 1996 Notes and Senior  1997
Notes. The remainder of the net proceeds will be available for general corporate
purposes,   including   capital  expenditures   for  cost   reduction,  capacity
improvement and future growth opportunities.

    Sources and  uses  of funds  in  the Transactions  are  estimated to  be  as
follows:

<TABLE>
<CAPTION>
                                                                                   (DOLLARS IN MILLIONS)
<S>                                                                                <C>
Sources:
  The Offering, net of the estimated underwriting discount and expenses..........        $     169
  The Note Placement.............................................................              150
  Cash on hand...................................................................              150
                                                                                             -----
                                                                                         $     469
                                                                                             -----
                                                                                             -----
Uses:
  Payment of bank debt...........................................................        $     140
  Redemption of Senior 1995 Notes and Senior 1998 Notes..........................              110
  Purchase of Senior 1996 Notes and Senior 1997 Notes............................              128
  General corporate purposes.....................................................               91
                                                                                             -----
                                                                                         $     469
                                                                                             -----
                                                                                             -----
</TABLE>

    Collectively,  the  Transactions are  designed, among  other things,  to (i)
reduce the  Corporation's financial  leverage,  (ii) reduce  the amount  of  the
Corporation's  debt  maturing  in  1995 through  1998,  (iii)  extend  the final
maturity of a significant  portion of the Corporation's  debt, (iv) improve  the
Corporation's financial and operating flexibility under the Credit Agreement and
(v)  provide funds for general  corporate purposes. See "Management's Discussion
and Analysis of Financial Condition and  Results of Operations -- Liquidity  and
Capital Resources."

                                       13
<PAGE>
                                 CAPITALIZATION

    The  following table sets forth the unaudited consolidated capitalization of
the Corporation and its subsidiaries as of September 30, 1993 and as adjusted to
give effect  to the  Transactions, including  the sale  of 6,000,000  shares  of
Common  Stock by the Corporation  in the Offering, based  on an assumed offering
price of $29.625 per share (the last reported sale price of the Common Stock  on
the  NYSE  Composite Tape  on January  3, 1994).  This table  should be  read in
conjunction with  the  Pro  Forma Condensed  Consolidated  Financial  Statements
contained elsewhere in this Prospectus.

<TABLE>
<CAPTION>
                                                                              AS OF SEPTEMBER 30, 1993
                                                                             --------------------------
                                                                             HISTORICAL   PRO FORMA(A)
                                                                             -----------  -------------
<S>                                                                          <C>          <C>
                                                                                    (UNAUDITED)
                                                                               (DOLLARS IN MILLIONS)
Total Debt:
Bank debt..................................................................   $     449     $     309
Senior notes and debentures
  8% Senior Notes due 1995.................................................          75            --
  8% Senior Notes due 1996.................................................          90            26
  8% Senior Notes due 1997.................................................         100            36
  9% Senior Notes due 1998.................................................          35            --
  9 1/4% Senior Notes due 2001.............................................          --           150
  10 1/4% Senior Notes due 2002............................................         478           478
  7 7/8% Sinking Fund Debentures due 2004..................................          38            38
  8 3/4% Sinking Fund Debentures due 2017..................................         200           200
Industrial revenue bonds and other secured debt............................          78            78
                                                                             -----------  -------------
Total principal amount of debt.............................................       1,543         1,315
Less unamortized reorganization discount...................................         (90)          (69)
                                                                             -----------  -------------
Total carrying amount of debt..............................................       1,453         1,246
                                                                             -----------  -------------
Stockholders' Equity/(Deficit):
  Preferred Stock, $1 par value, 36,000,000 shares authorized, no shares
   outstanding.............................................................          --            --
  Common Stock, $0.10 par value, 200,000,000 shares authorized, 37,157,553
   shares outstanding prior to the Offering, 43,157,553 shares outstanding
   upon consummation of the Offering (b)...................................           4             5
  Capital received in excess of par value..................................          --           168
  Deferred currency translation............................................         (10)          (10)
  Reinvested earnings/(deficit)............................................         (46)          (60)
                                                                             -----------  -------------
    Total stockholders' equity/(deficit)...................................         (52)          103
                                                                             -----------  -------------
      Total capitalization.................................................   $   1,401     $   1,349
                                                                             -----------  -------------
                                                                             -----------  -------------
<FN>
- ------------------------
        (a) Assumes purchases by the Corporation of $64 million principal amount
    of  Senior 1996 Notes and $64 million principal amount of Senior 1997 Notes.
    Such purchases are assumed to be made at 100% of principal amount.  However,
    the  Senior 1996 Notes and Senior 1997  Notes are not callable and there can
    be no assurance  that the Corporation  will be able  to purchase the  Senior
    1996  Notes or Senior 1997 Notes as shown. Funds not used to purchase Senior
    1996 Notes and Senior 1997 Notes within 12 months after the consummation  of
    the Offering may become subject to the cash sweep mechanism under the Credit
    Agreement. See "Description of Credit Agreement."
</TABLE>


                                       14
<PAGE>
<TABLE>
    <S> <C>
        (b)  Does not  include (i)  warrants to purchase  up to  an aggregate of
    2,602,472 shares  of Common  Stock which  are immediately  exercisable at  a
    price of $16.14 per share and (ii) options held by management to purchase up
    to  an  aggregate of  1,673,000  shares of  Common  Stock which  will become
    exercisable at a price of $10.3125 per share in the years 1994 through 1996.
    See "Management -- Executive Compensation and Benefits."
</TABLE>

                          PRICE RANGE OF COMMON STOCK

    The Common Stock is listed on the NYSE under the symbol "USG." In connection
with the issuance of  shares of Common Stock  pursuant to the Prepackaged  Plan,
trading  of the Common Stock commenced on the NYSE on a when-issued basis on May
7, 1993 and a regular-way basis on May  21, 1993. During the period from May  6,
1993,  the date the Corporation emerged  from Chapter 11 bankruptcy proceedings,
through December 31, 1993,  the high and  low sales prices  of Common Stock,  as
reported  on the  NYSE Composite  Tape, were $30  1/2 per  share and  $9 5/8 per
share, respectively.  The  last reported  sale  price  of the  Common  Stock  as
reported  on the NYSE Composite  Tape on January 3, 1994  was $29 5/8 per share.
The high and the low sales prices of the Common Stock by quarter during 1993, as
reported on the NYSE Composite Tape, were:

<TABLE>
<CAPTION>
                                                                             MAY 7         JULY 1        OCTOBER 1
                                                                            THROUGH       THROUGH         THROUGH
                                                                            JUNE 30     SEPTEMBER 30    DECEMBER 31
                                                                          -----------  --------------  -------------
<S>                                                                       <C>          <C>             <C>
High....................................................................   $      14   $      22 5/8   $    30 1/2
Low.....................................................................       9 5/8              13        20 1/4
</TABLE>

    Although common stock of the Corporation was publicly traded prior to May 7,
1993, the historical sales prices are  not comparable with the sales prices  set
forth  above due  to the  Restructuring. Potential  investors are  encouraged to
obtain current trading price  information. As of December  31, 1993, there  were
approximately 13,898 stockholders of record of Common Stock.

                                DIVIDEND POLICY

    Since July 1988, the Corporation has not declared or paid any cash dividends
on  its  Common Stock.  The Corporation  does  not presently  intend to  pay any
dividends in  the  foreseeable future.  In  addition, the  Corporation's  Credit
Agreement   and   certain  other   debt   instruments  currently   restrict  the
Corporation's ability to  pay dividends  to common  stockholders. Moreover,  the
Corporation  is prohibited from paying any dividends without surplus earnings or
capital earmarked  for this  purpose  under Delaware  corporate law.  See  "Risk
Factors  --  Restrictions on  Common Stock  Dividends," "Description  of Capital
Stock," "Description  of  Credit  Agreement"  and  "Description  of  Other  Debt
Obligations."

                                       15
<PAGE>
                                    DILUTION

    The following table presents certain information concerning the net tangible
book  value per  share of  the Common  Stock as  of September  30, 1993,  and as
adjusted to  reflect  the  sale of  6,000,000  shares  of Common  Stock  by  the
Corporation  in the Offering, at an assumed public offering price of $29.625 per
share (the last reported sale  price of the Common  Stock on the NYSE  Composite
Tape on January 3, 1994) and after deducting the estimated offering expenses and
underwriting discounts:

<TABLE>
<S>                                                        <C>        <C>
Assumed public offering price per share..................             $   29.63
Net tangible book value (deficit) per share before the
 Offering (1)............................................  $  (22.28)
Increase per share attributable to payments by new
 investors...............................................       6.69
                                                           ---------
Pro forma net tangible book value (deficit) per share
 after the Offering......................................               (15.59)
                                                                      ---------
Dilution per share to new investors (2)..................             $   45.22
                                                                      ---------
                                                                      ---------
<FN>
- ------------------------
          (1) Net tangible book value per share of Common Stock is determined by
              dividing  the Corporation's  tangible net  worth at  September 30,
              1993  by  the   aggregate  number  of   shares  of  Common   Stock
              outstanding.
          (2) Dilution  is determined by subtracting net tangible book value per
              share after the Offering from the public offering price per share.
</TABLE>

             PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

    The unaudited Pro  Forma Condensed Consolidated  Statements of Earnings  for
the  nine months ended September  30, 1993 and the  twelve months ended December
31, 1992 and the unaudited Pro Forma Condensed Consolidated Balance Sheet as  of
September  30, 1993 illustrate the effect of the Transactions. The unaudited pro
forma condensed consolidated financial statements should be read in  conjunction
with  "Selected Consolidated  Financial Data"  and "Management's  Discussion and
Analysis of Financial Condition and Results of Operations" and the Corporation's
Consolidated Financial Statements and related notes thereto contained  elsewhere
in this Prospectus.

    The  unaudited Pro Forma  Condensed Consolidated Statements  of Earnings for
the nine months ended  September 30, 1993 and  the twelve months ended  December
31,  1992 were prepared as  if the Transactions had  occurred on January 1, 1993
and January 1, 1992, respectively.  Due to the Restructuring and  implementation
of  fresh start accounting,  financial statements for periods  after May 6, 1993
are not comparable  to financial  statements prior  to that  date. However,  for
presentation  of  the Pro  Forma Condensed  Consolidated Statement  of Earnings,
results for the first  nine months of  1993 are shown  under the caption  "Total
Before Adjustments." The adjustments set forth under the caption "Restructuring"
reflect the implementation of the Prepackaged Plan on May 6, 1993, including the
adoption  of fresh  start accounting prescribed  by AICPA  Statement of Position
90-7, and the issuance of $138  million in aggregate principal amount of  Senior
2002  Notes  on  August 10,  1993  in exchange  for  bank debt  as  though those
transactions had  also  occurred  on  January  1,  1993  and  January  1,  1992,
respectively.

    The unaudited Pro Forma Condensed Consolidated Balance Sheet as of September
30, 1993 was prepared as if the consummation of the Transactions had occurred on
September 30, 1993.

                                       16
<PAGE>
                                USG CORPORATION
             PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS
                      NINE MONTHS ENDED SEPTEMBER 30, 1993
                                  (UNAUDITED)
                  (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                           PRO FORMA ADJUSTMENTS
                                                      TOTAL BEFORE    --------------------------------
                                                     ADJUSTMENTS (A)  RESTRUCTURING (C)  TRANSACTIONS    PRO FORMA
                                                     ---------------  -----------------  -------------  -----------
<S>                                                  <C>              <C>                <C>            <C>
Net sales..........................................     $   1,420         $                $             $   1,420
Cost of products sold..............................         1,143                                            1,143
                                                          -------           -------      -------------  -----------
Gross profit.......................................           277                                              277
Selling and administrative expenses................           163                                              163
Amortization of excess reorganization value........            71                57(d)                         128
                                                          -------           -------      -------------  -----------
Operating profit/(loss)............................            43               (57)                           (14)
Interest expense...................................           142               (39)(e)          (17)(g)         86
Interest income....................................            (5)               --                             (5)
Other (income)/expense, net........................            --                (1)                            (1)
Reorganization items...............................          (709)              709(f)                          --
                                                          -------           -------      -------------  -----------
Earnings/(loss) before taxes on income,
 extraordinary gain and changes in accounting
 principles........................................           615              (726)              17           (94)
Taxes on income....................................            21               (16)               1             6
                                                          -------           -------      -------------  -----------
Earnings/(loss) before extraordinary gain and
 changes in accounting principles..................           594              (710)              16          (100)
                                                          -------           -------      -------------  -----------
                                                          -------           -------      -------------  -----------
Earnings/(loss) before extraordinary gain and
 changes in accounting principles per common
 share.............................................            --(b)                                         (2.28)(h)
                                                           -------                                      -----------
                                                           -------                                      -----------
</TABLE>

  See accompanying Notes to the Pro Forma Condensed Consolidated Statement of
                                   Earnings.

                                       17
<PAGE>
                                USG CORPORATION
      NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS
                      NINE MONTHS ENDED SEPTEMBER 30, 1993
                                  (UNAUDITED)
                             (DOLLARS IN MILLIONS)

    The  following  notes set  forth the  explanations  and assumptions  used in
preparing the unaudited Pro Forma Condensed Consolidated Statement of  Earnings.
The pro forma adjustments are based on estimates by the Corporation's management
using information currently available.

    (a) Due  to the Restructuring and  implementation of fresh start accounting,
        financial statements for periods after May 6, 1993 are not comparable to
        financial statements prior  to that date.  However, for presentation  of
        the  Pro Forma Condensed Consolidated Statement of Earnings, results for
        the first nine months of 1993 are shown under the caption "Total  Before
        Adjustments."

    (b) Due  to the Restructuring and  implementation of fresh start accounting,
        earnings/(loss) before  extraordinary  gain and  changes  in  accounting
        principles  per common  share for  the first  nine months  of 1993 shown
        under the  caption  "Total Before  Adjustments"  is not  meaningful  and
        therefore has been omitted.

    (c) The  adjustments set forth under the caption "Restructuring" reflect the
        implementation of the  Prepackaged Plan  on May 6,  1993, including  the
        adoption  of  fresh start  accounting prescribed  by AICPA  Statement of
        Position 90-7, and the issuance of Senior 2002 Notes on August 10,  1993
        in  exchange for  bank debt,  as if  those transactions  had occurred on
        January 1, 1993.

    (d) Reflects amortization of  excess reorganization value  which would  have
        been recorded during the period of January 1 through May 6, 1993 had the
        Restructuring been consummated on January 1, 1993.

    (e) Reflects  net reduction of interest expense  for the period of January 1
        through May 6,  1993 as a  result of the  assumed implementation of  the
        Prepackaged  Plan and issuance of Senior  2002 Notes on January 1, 1993.
        The net reduction has been estimated as follows:

<TABLE>
<S>                                                             <C>        <C>
Decrease in interest expense:
  Bank debt...................................................  $     (21)
  7 3/8% senior notes due 1991................................         (3)
  13 1/4% senior subordinated debentures......................        (22)
  16% junior subordinated debentures..........................        (18)
                                                                ---------
                                                                           $     (64)
Increase in interest expense:
  Senior 1995 Notes...........................................          2
  Senior 1998 Notes...........................................          1
  Senior 2002 Notes...........................................         18
                                                                ---------
                                                                                  21
Amortization of reorganization discount.......................                     4
                                                                           ---------
Net reduction of interest expense.............................                   (39)
                                                                           ---------
                                                                           ---------
</TABLE>

     (f) Reflects the  elimination of  the net  gain from  reorganization  items
         associated  with  the implementation  of the  Prepackaged Plan  and the
         adoption of fresh  start accounting,  since this gain  would have  been
         recorded in the period prior to January 1, 1993.

                                       18
<PAGE>
                                USG CORPORATION
NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS (CONTINUED)

    (g) Reflects   net  reduction  of  interest  expense  as  a  result  of  the
        Transactions. The net reduction has been estimated as follows:

<TABLE>
<S>                                                             <C>        <C>
Decrease in interest expense:
  Bank debt...................................................  $     (11)
  Senior 1995 Notes...........................................         (4)
  Senior 1996 Notes...........................................         (4)
  Senior 1997 Notes...........................................         (4)
  Senior 1998 Notes...........................................         (2)
                                                                ---------
                                                                           $     (25)
Increase in interest expense:
  Senior 2001 Notes (assumed to bear interest at 9 1/4% per
   annum).....................................................                    11
Write-off of unamortized reorganization discount..............                    (3)
                                                                           ---------
Net reduction of interest expense.............................                   (17)
                                                                           ---------
                                                                           ---------
</TABLE>

    (h) Pro forma  earnings/(loss)  before  extraordinary gain  and  changes  in
        accounting principles per common share is computed based upon an average
        of  43,157,468 shares of  Common Stock assumed  to be outstanding during
        the nine  months  ended  September  30,  1993.  Amortization  of  excess
        reorganization  value  and  reorganization  discount  reduced  pro forma
        earnings/(loss) before  extraordinary  gain and  changes  in  accounting
        principles per common share by $3.11 (or $134 milllion in total).

                                       19
<PAGE>
                                USG CORPORATION
             PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS
                          YEAR ENDED DECEMBER 31, 1992
                                  (UNAUDITED)
                  (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                           PRO FORMA ADJUSTMENTS
                                                                      --------------------------------
                                                         HISTORICAL   RESTRUCTURING (A)  TRANSACTIONS    PRO FORMA
                                                         -----------  -----------------  -------------  -----------
<S>                                                      <C>          <C>                <C>            <C>
Net sales..............................................   $   1,777       $                $             $   1,777
Cost of products sold..................................       1,460              (4)(b)                      1,456
                                                         -----------        -------      -------------  -----------
Gross profit...........................................         317               4                            321
Selling and administrative expenses....................         218              (1)(c)                        217
Amortization of excess reorganization value............          --             170(d)                         170
                                                         -----------        -------      -------------  -----------
Operating profit/(loss)................................          99            (165)                           (66)
Interest expense.......................................         334            (200)(e)          (18)(i)        116
Interest income........................................         (12)              2(f)                         (10)
Other (income)/expense, net............................           1              (6)(g)                         (5)
                                                         -----------        -------      -------------  -----------
Earnings/(loss) before taxes on income, extraordinary
 gain and changes in
 accounting principles.................................        (224)             39               18          (167)
Taxes on income/(income tax benefit)...................         (33)             48                6            21
                                                         -----------        -------      -------------  -----------
Earnings/(loss) before extraordinary gain
 and changes in accounting principles..................        (191)             (9)              12          (188)
                                                         -----------        -------      -------------  -----------
                                                         -----------        -------      -------------  -----------
Earnings/(loss) before extraordinary gain
 and changes in accounting principles per
 common share..........................................          --(h)                                       (4.34 )(j)
                                                         -----------                                    -----------
                                                         -----------                                    -----------
</TABLE>

                                       20
<PAGE>
                                USG CORPORATION
      NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS
                          YEAR ENDED DECEMBER 31, 1992
                                  (UNAUDITED)
                             (DOLLARS IN MILLIONS)

    The  following  notes  set  forth  the  explanations  and  assumptions  used
preparing the unaudited Pro Forma Condensed Consolidated Statement of  Earnings.
The pro forma adjustments are based on estimates by the Corporation's management
using information currently available.

    (a) The  adjustments set forth under the caption "Restructuring" reflect the
        implementation of the  Prepackaged Plan  on May 6,  1993, including  the
        adoption  of  fresh start  accounting prescribed  by AICPA  Statement of
        Position 90-7, and the issuance of Senior 2002 Notes on August 10,  1993
        in exchange for bank debt, as those transactions had occurred on January
        1,  1992. The  net gain  from reorganization  items associated  with the
        implementation of the Prepackaged Plan  would have been recorded in  the
        period prior to January 1, 1992.

    (b) Reflects  (i) the reversal of 1992  goodwill amortization of $3 million;
        (ii) adjusted depreciation expense of $2 million due to a write-down  of
        property,  plant and equipment; and (iii)  increased pension costs of $1
        million.

    (c) Reflects the adjustment  of rent  expense to  the fair  market value  of
        various operating leases.

    (d) Reflects  amortization of  excess reorganization value  which would have
        been recorded during the period of  January 1 through December 31,  1992
        had the Restructuring been consummated on January 1, 1992.

    (e) Reflects  net reduction of interest expense  for the period of January 1
        through December 31, 1992 as a  result of the assumed implementation  of
        the  Prepackaged Plan  and issuance of  Senior 2002 Notes  on January 1,
        1992. The net reduction has been estimated as follows:

<TABLE>
<S>                                                            <C>        <C>
Decrease in interest expense:
  Bank debt..................................................  $     (86)
  7 3/8% senior notes due 1991...............................         (7)
  13 1/4% senior subordinated debentures.....................        (97)
  16% junior subordinated debentures.........................        (74)
                                                               ---------
                                                                          $    (264)
Increase in interest expense:
  Senior 1995 Notes..........................................          6
  Senior 1998 Notes..........................................          2
  Senior 2002 Notes..........................................         45
                                                               ---------
                                                                                 53
Amortization of reorganization discount......................                    11
                                                                          ---------
Net reduction of interest expense............................                  (200)
                                                                          ---------
                                                                          ---------
</TABLE>

     (f) Reflects interest  income that  would  not have  been received  on  the
         proceeds  from the sale  of the Corporation's  DAP, Inc. subsidiary had
         the Restructuring occurred on January 1, 1992.

    (g) Reflects reversal of amortization of deferred financing costs associated
        with the 1988 Recapitalization which were amortized in 1992.

    (h) Due to the Restructuring and  implementation of fresh start  accounting,
        historical  earnings/ (loss)  before extraordinary  gain and  changes in
        accounting principles per common share  for the year ended December  31,
        1992 is not meaningful and therefore has been omitted.

                                       21
<PAGE>
                                USG CORPORATION
NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF EARNINGS (CONTINUED)

     (i) Reflects  net  reduction  of  interest  expense  as  a  result  of  the
         Transactions. The net reduction has been estimated as follows:

<TABLE>
<S>                                                             <C>        <C>
Decrease in interest expense:
  Bank debt...................................................  $      (8)
  Senior 1995 Notes...........................................         (6)
  Senior 1996 Notes...........................................         (5)
  Senior 1997 Notes...........................................         (5)
  Senior 1998 Notes...........................................         (3)
                                                                ---------
                                                                           $     (27)
Increase in interest expense:
  Senior 2001 Notes (assumed to bear interest at 9 1/4% per
   annum).....................................................                    14
Write-off of unamortized reorganization discount..............                    (5)
                                                                           ---------
Net reduction of interest expense.............................                   (18)
                                                                           ---------
                                                                           ---------
</TABLE>

     (j) Pro forma  earnings/(loss) before  extraordinary  gain and  changes  in
         accounting  principles  per  common  share is  computed  based  upon an
         average of 43,178,175 shares of Common Stock assumed to be  outstanding
         during  the  year  ended  December  31,  1992.  Amortization  of excess
         reorganization value  and  reorganization discount  reduced  pro  forma
         earnings/(loss)  before  extraordinary gain  and changes  in accounting
         principles per common share by $4.10 (or $177 million in total).

                                       22
<PAGE>
                                USG CORPORATION
                 PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                            AS OF SEPTEMBER 30, 1993
                                  (UNAUDITED)
                  (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA)

                                     ASSETS

<TABLE>
<CAPTION>
                                                                            HISTORICAL    ADJUSTMENTS    PRO FORMA
                                                                            -----------  -------------  -----------
<S>                                                                         <C>          <C>            <C>
Current assets:
  Cash and cash equivalents...............................................   $     157   $     (59)(a)   $      98
  Receivables.............................................................         292                         292
  Inventories.............................................................         147                         147
                                                                            -----------  -------------  -----------
    Total current assets..................................................         596         (59)            537
Property, plant and equipment, net........................................         754                         754
Reorganization value in excess of identifiable assets.....................         776                         776
Other assets..............................................................          60          (1)(b)          59
                                                                            -----------  -------------  -----------
    Total assets..........................................................       2,186         (60)          2,126
                                                                            -----------  -------------  -----------
                                                                            -----------  -------------  -----------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable........................................................         101                         101
  Accrued expenses........................................................         211                         211
  Notes payable...........................................................           8                           8
  Long-term debt maturing within one year.................................           6                           6
  Taxes on income.........................................................          14                          14
                                                                            -----------  -------------  -----------
    Total current liabilities.............................................         340                         340
                                                                            -----------  -------------  -----------
Long-term debt............................................................       1,439        (207)(c)       1,232
Deferred income taxes.....................................................         173          (8)(d)         165
Other liabilities.........................................................         286                         286
Stockholders' equity/(deficit):
  Preferred stock.........................................................          --                          --
  Common stock............................................................           4           1(e)            5
  Capital received in excess of par value.................................          --         168(e)          168
  Deferred currency translation...........................................         (10)         --             (10)
  Reinvested earnings/(deficit)...........................................         (46)        (14)(f)         (60)
                                                                            -----------  -------------  -----------
    Total stockholders' equity/(deficit)..................................         (52)        155             103
                                                                            -----------  -------------  -----------
    Total liabilities and stockholders' equity............................       2,186         (60)          2,126
                                                                            -----------  -------------  -----------
                                                                            -----------  -------------  -----------
Book value/(deficit) per common share.....................................       (1.40)        3.78           2.38
                                                                            -----------  -------------  -----------
                                                                            -----------  -------------  -----------
</TABLE>

 See accompanying Notes to the Pro Forma Condensed Consolidated Balance Sheet.

                                       23
<PAGE>
                                USG CORPORATION
          NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                            AS OF SEPTEMBER 30, 1993
                                  (UNAUDITED)
                             (DOLLARS IN MILLIONS)

    The  following  notes set  forth the  explanations  and assumptions  used in
preparing the unaudited Pro Forma Condensed Consolidated Balance Sheet. The  pro
forma  adjustments are based on estimates  by the Corporation's management using
information currently available.

    (a) Reflects the reduction in cash and cash equivalents as follows:

<TABLE>
<S>                                                                 <C>
  Payment of bank debt............................................  $    (140)
  Retirement of Senior 1995 Notes.................................        (75)
  Retirement of Senior 1996 Notes.................................        (64)
  Retirement of Senior 1997 Notes.................................        (64)
  Retirement of Senior 1998 Notes.................................        (35)
  Issuance for cash of Senior 2001 Notes in the Note Placement....        150
  Issuance of Common Stock in the Offering........................        169
                                                                    ---------
  Total...........................................................        (59)
                                                                    ---------
                                                                    ---------
</TABLE>

            Assumes purchases by the Corporation of $64 million principal amount
        of Senior 1996  Notes and $64  million principal amount  of Senior  1997
        Notes.  Such  purchases are  assumed  to be  made  at 100%  of principal
        amount. However, the  Senior 1996 Notes  and Senior 1997  Notes are  not
        callable and there can be no assurance that the Corporation will be able
        to  purchase the Senior 1996 Notes or  Senior 1997 Notes as shown. Funds
        not used to purchase Senior 1996  Notes and Senior 1997 Notes within  12
        months  after the consummation of the Offering may become subject to the
        cash sweep mechanism  under the  Credit Agreement.  See "Description  of
        Credit Agreement."

    (b) Write-off  of deferred financing costs associated with debt to be repaid
        in the Transactions.

    (c) Reflects net reduction of long-term debt as follows:

<TABLE>
<S>                                                                 <C>
  Payment of bank debt............................................  $    (140)
  Retirement of Senior 1995 Notes.................................        (75)
  Retirement of Senior 1996 Notes.................................        (64)
  Retirement of Senior 1997 Notes.................................        (64)
  Retirement of Senior 1998 Notes.................................        (35)
  Issuance of Senior 2001 Notes in the Note Placement.............        150
                                                                    ---------
                                                                         (228)
  Write-off of related unamortized reorganization discount........         21
                                                                    ---------
  Total...........................................................       (207)
                                                                    ---------
                                                                    ---------
</TABLE>

    (d) Reflects reduction in  deferred taxes as  a result of  the write-off  of
        unamortized  reorganization  discount  related to  debt  retired  in the
        Transactions.

    (e) Reflects the issuance  of 6,000,000  shares of Common  Stock, par  value
        $0.10 per share, in the Offering, yielding net proceeds of $169 million.

                                       24
<PAGE>
                                USG CORPORATION
          NOTES TO THE PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
                                  (CONTINUED)

     (f) The extraordinary loss, net of taxes, is estimated as follows:

<TABLE>
<S>                                                          <C>       <C>
   Write-off of unamortized reorganization discount:
   Bank debt...............................................  $(13   )
   Senior 1995 Notes.......................................      (2)
   Senior 1996 Notes.......................................      (3)
   Senior 1997 Notes.......................................      (2)
   Senior 1998 Notes.......................................      (1)
                                                             -------
                                                                       $  (21)
   Write-off of deferred issuance costs....................                (1)
   Estimated tax benefit...................................                 8
                                                                       -------
   Total...................................................               (14)
                                                                       -------
                                                                       -------
</TABLE>

                                       25
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
       (DOLLARS IN MILLIONS, EXCEPT PER SHARE DATA AND WALLBOARD PRICES)

    The  following table  sets forth selected  historical consolidated financial
information of  the  Corporation for  the  post-Restructuring period  of  May  7
through  September 30, 1993  and for the pre-Restructuring  periods of January 1
through May 6, 1993, the nine months ended September 30, 1992 and the five years
ended December 31, 1992.  Due to the Restructuring  and implementation of  fresh
start  accounting,  financial  statements  subsequent to  May  6,  1993  are not
comparable to financial statements for periods prior to that date.  Accordingly,
a  vertical line  has been added  to separate such  information. The information
provided below has  not been  audited. However, the  selected annual  historical
consolidated  financial information  presented below  has been  derived from the
Consolidated Financial Statements of the Corporation and its subsidiaries  which
were  examined by Arthur Andersen & Co., whose report with respect to certain of
such financial statements  appears elsewhere in  this Prospectus. The  following
financial  information should be  read in conjunction  with "Pro Forma Condensed
Consolidated Financial  Statements," "Management's  Discussion and  Analysis  of
Financial   Condition  and   Results  of   Operations"  and   the  Corporation's
Consolidated Financial Statements and notes  thereto, all of which are  included
elsewhere  in this Prospectus.  See "Index To  Consolidated Financial Statements
and Supplemental Data."
<TABLE>
<CAPTION>
                                                                            NINE
                                                                           MONTHS
                                            MAY 7 THROUGH    JANUARY 1     ENDED            YEARS ENDED DECEMBER 31
                                            SEPTEMBER 30    THROUGH MAY  SEPTEMBER   --------------------------------------
                                                1993         6 1993(A)    30 1992      1992      1991      1990      1989
                                           ---------------  -----------  ----------  --------  --------  --------  --------
INCOME STATEMENT DATA:
<S>                                        <C>              <C>          <C>         <C>       <C>       <C>       <C>
  Net sales...............................        $829         $591         $1,341     $1,777    $1,712    $1,915    $2,007
  Cost of products sold...................         661          482          1,095      1,460     1,385     1,499     1,506
                                           ---------------  -----------  ----------  --------  --------  --------  --------
  Gross profit............................         168          109            246        317       327       416       501
  Amortization of excess reorganization
   value..................................          71           --             --         --        --        --        --
  Selling and administrative expenses.....          92           71            159        218       194       203       209
  Restructuring expenses..................          --           --             --         --        --        18        --
                                           ---------------  -----------  ----------  --------  --------  --------  --------
  Operating profit........................           5           38             87         99       133       195       292
  Interest expense........................          56           86            253        334       333       292       297
  Interest income.........................          (3)          (2)            (8)       (12)      (11)       (8)      (10)
  Other (income)/expense, net.............          (6)           6             --          1         5         5        15
  Reorganization items....................          --         (709)(b)         --         --        --        --        --
  Nonrecurring gain.......................          --           --             --         --        --       (34)      (33)
  Taxes on income/(income tax benefit)....           4           17            (27)       (33)      (53)       (6)        3
  Extraordinary gain, net of taxes........          --          944             --
  Changes in accounting principles, net...          --         (150)            --
  Earnings/(loss) from discontinued
   operations, net........................          --           --             --         --       (20)      (36)        8
                                           ---------------  -----------  ----------  --------  --------  --------  --------
  Net earnings/(loss).....................         (46)(c)    1,434           (131)      (191)     (161)      (90)       28
                                           ---------------  -----------  ----------  --------  --------  --------  --------
                                           ---------------  -----------  ----------  --------  --------  --------  --------
  Average number of common shares (d).....  37,157,477
  Net loss per common share (d)...........       (1.23)(c)
  Dividends paid per common share (d).....          --
BALANCE SHEET DATA (as of the end of the
 period):
  Total assets............................       2,186        2,194          1,676      1,659     1,626     1,675     1,585
  Total debt..............................       1,543(e)     1,555(e)       2,706      2,711     2,660     2,600     2,428
  Total stockholders' equity/(deficit)....         (52)           4         (1,812)    (1,880)   (1,680)   (1,518)   (1,438)
OTHER INFORMATION:
  EBITDA (f)..............................         102           63            132        159       194       280       361
  Capital expenditures....................          16           12             27         49        49        64        76
  Gross margin (g)........................        20.3%        18.4%          18.3%      17.8%     19.1%     21.7%     25.0%
  EBITDA margin (h).......................        12.3         10.7            9.8        8.9      11.3      14.6      18.0
  Gypsum wallboard shipments: (i)
    Total U.S. Industry...................         9.2          6.7           15.3       20.3      18.4      20.7      21.3
    U.S. Gypsum...........................         3.1          2.3            5.4        7.2       6.6       7.2       7.2
  U.S. Gypsum wallboard price (j).........      $79.41       $75.81         $71.01     $71.58    $72.53    $79.08    $85.68

<CAPTION>
                                              1988
                                            --------
INCOME STATEMENT DATA:
<S>                                        <C>
  Net sales...............................    $2,070
  Cost of products sold...................     1,536
                                            --------
  Gross profit............................       534
  Amortization of excess reorganization
   value..................................        --
  Selling and administrative expenses.....       223
  Restructuring expenses..................        20
                                            --------
  Operating profit........................       291
  Interest expense........................       178
  Interest income.........................       (13)
  Other (income)/expense, net.............        16
  Reorganization items....................        --
  Nonrecurring gain.......................        --
  Taxes on income/(income tax benefit)....        43
  Extraordinary gain, net of taxes........
  Changes in accounting principles, net...
  Earnings/(loss) from discontinued
   operations, net........................        58
                                            --------
  Net earnings/(loss).....................       125
                                            --------
                                            --------
  Average number of common shares (d).....
  Net loss per common share (d)...........
  Dividends paid per common share (d).....
BALANCE SHEET DATA (as of the end of the
 period):
  Total assets............................     1,806
  Total debt..............................     2,643
  Total stockholders' equity/(deficit)....    (1,471)
OTHER INFORMATION:
  EBITDA (f)..............................       383
  Capital expenditures....................        81
  Gross margin (g)........................      25.8%
  EBITDA margin (h).......................      18.5
  Gypsum wallboard shipments: (i)
    Total U.S. Industry...................      21.3
    U.S. Gypsum...........................       7.3
  U.S. Gypsum wallboard price (j).........    $90.65
</TABLE>

                                       26
<PAGE>
NOTES TO SELECTED CONSOLIDATED FINANCIAL DATA

(a) Fresh start accounting adjustments were recorded on May 6, 1993.

(b) Reflects one-time gain from reorganization items, including an $851  million
    gain  from recording reorganization value  in excess of identifiable assets,
    partially offset  by  other  fresh  start  adjustments,  fees  and  expenses
    associated  with  the Restructuring  and a  write-off of  deferred financing
    costs associated with the 1988 Recapitalization.

(c) For the period of May 7  through September 30, 1993, amortization of  excess
    reorganization  value  and  reorganization  discount  reduced  reported  net
    earnings by $75 million, or $2.03 per share.

(d) Common shares and per share data for periods prior to May 7, 1993 have  been
    omitted  because, due to the Restructuring and implementation of fresh start
    accounting, they are not meaningful.

(e) Total  debt as  of September  30  and May  6, 1993  are shown  at  principal
    amounts.  The carrying amounts (net  of unamortized reorganization discount)
    as reflected  on the  Corporation's balance  sheets as  of those  dates  are
    $1,453 million and $1,461 million, respectively.

(f)  EBITDA represents earnings before interest, taxes, depreciation, depletion,
    amortization,   non-cash   postretirement  charges,   reorganization  items,
    extraordinary  gain,  discontinued  operations  and  changes  in  accounting
    principles. The Corporation believes EBITDA is helpful in understanding cash
    flow generated from operations that is available for taxes, debt service and
    capital  expenditures.  In addition,  EBITDA  facilitates the  monitoring of
    covenants related to  certain long-term  debt and  other agreements  entered
    into in conjunction with the Restructuring.

(g) Gross profit as a percentage of net sales.

(h) EBITDA as a percentage of net sales.

(i)  In billions of square feet.

(j)   Represents average price per thousand  square feet realized by U.S. Gypsum
    during the periods shown.

                                       27
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

PERIODS ENDED SEPTEMBER 30, 1993 COMPARED WITH 1992 RESULTS OF OPERATIONS

    On May 6, 1993, the  Corporation completed a comprehensive restructuring  of
its  debt through implementation  of the Prepackaged Plan  as confirmed on April
23, 1993  by  the  Bankruptcy  Court.  As a  result  of  the  recording  of  the
Restructuring  transaction  and implementation  of  fresh start  accounting, the
Corporation's results  of operations  after  May 6,  1993  as presented  in  the
consolidated  financial  statements are  not comparable  to results  reported in
prior periods. See  Note 3 of  the Notes to  the Consolidated Interim  Financial
Statements   for   information  on   consummation   of  the   Restructuring  and
implementation of fresh start accounting.

    To facilitate a  meaningful comparison  of the Corporation's  1993 and  1992
operating  performance, the following discussions of  results of operations on a
consolidated basis and by segment are  presented on a traditional third  quarter
and  nine months basis for both  years. Consequently, 1993 information presented
below does not comply with accounting requirements for companies upon  emergence
from  bankruptcy which  call for  separate reporting  for the newly-restructured
company and the predecessor company.  Included in the following discussions  are
comparisons  of EBITDA. The  Corporation believes that  EBITDA, which represents
earnings before interest, taxes, depreciation, depletion, amortization, non-cash
postretirement charges, reorganization items, extraordinary gain and changes  in
accounting   principles,  is  a  useful  supplement  to  net  income  and  other
consolidated  income  statement  data  as  an  indicator  of  the  Corporation's
operating  performance and is helpful in  understanding cash flow generated from
operations that is available for taxes, debt service and capital expenditures.

CONSOLIDATED RESULTS OF OPERATIONS (DOLLARS IN MILLIONS):

<TABLE>
<CAPTION>
                                                                               THREE MONTHS ENDED       NINE MONTHS
                                                                                                           ENDED
                                                                                  SEPTEMBER 30          SEPTEMBER 30
                                                                              --------------------  --------------------
                                                                                1993       1992       1993       1992
                                                                              ---------  ---------  ---------  ---------
<S>                                                                           <C>        <C>        <C>        <C>
Net sales...................................................................  $     514  $     474  $   1,420  $   1,341
Cost of products sold.......................................................        409        380      1,143      1,095
                                                                              ---------  ---------  ---------  ---------
Gross profit................................................................        105         94        277        246
Selling and administrative expenses.........................................         56         55        163        159
Amortization of excess reorganization value.................................         43         --         71         --
                                                                              ---------  ---------  ---------  ---------
Operating profit............................................................          6         39         43         87
                                                                              ---------  ---------  ---------  ---------
                                                                              ---------  ---------  ---------  ---------
Calculation of EBITDA:
  Operating profit..........................................................  $       6  $      39  $      43  $      87
  Amortization of excess reorganization value...............................         43         --         71         --
  Depreciation and depletion................................................         14         14         42         42
  Other.....................................................................          2          1          9          3
                                                                              ---------  ---------  ---------  ---------
  EBITDA....................................................................         65         54        165        132
                                                                              ---------  ---------  ---------  ---------
                                                                              ---------  ---------  ---------  ---------
</TABLE>

    Net sales  of  $514 million  for  the third  quarter  of 1993,  the  highest
quarterly  net sales since the second quarter of 1989, increased $40 million, or
8.4%, over the third quarter of 1992.  Gross profit rose $11 million, or  11.7%,
in  the third quarter of 1993  over the 1992 period and,  as a percentage of net
sales, improved to 20.4%  from 19.8% .  For the first nine  months of 1993,  net
sales  and gross profit were up $79 million, or 5.9%, and $31 million, or 12.6%,
respectively, while gross profit as a percentage of net sales increased to 19.5%
from 18.3% for the first nine months of 1992. These improvements in 1993 results
primarily reflect increased gypsum wallboard pricing.

                                       28
<PAGE>
    Selling and administrative expenses increased  slightly in each 1993  period
versus  1992. However, these expenses  as a percentage of  net sales declined to
10.9%  and  11.5%  in  the  third  quarter  and  first  nine  months  of   1993,
respectively, from 11.6% and 11.9% in the comparable 1992 periods.

    As   of  May   7,  1993,  the   Corporation  began   amortizing  its  excess
reorganization value  which  was  established in  accordance  with  fresh  start
accounting  rules. This amortization amounted to  $43 million and $71 million in
the third quarter  and first  nine months of  1993, respectively,  with no  1992
counterpart.  Consequently,  1993  operating  profit is  not  comparable  to the
prior-year periods.

    EBITDA of $65 million  in the third quarter  of 1993, the highest  quarterly
result  since the third quarter of 1990, increased $11 million or 20.4% over the
third quarter of 1992. For the first  nine months of 1993, EBITDA increased  $33
million,  or  25.0%, over  the prior-year  period.  These increases  reflect the
improved gross margin performance.

RESULTS OF OPERATIONS BY GEOGRAPHIC AREA (DOLLARS IN MILLIONS):

<TABLE>
<CAPTION>
                                                                                        THREE MONTHS ENDED SEPTEMBER 30
                                                                                  --------------------------------------------
                                                                                       NET SALES                EBITDA
                                                                                  --------------------  ----------------------
                                                                                    1993       1992       1993        1992
                                                                                  ---------  ---------  ---------     -----
<S>                                                                               <C>        <C>        <C>        <C>
United States:
  Gypsum Products...............................................................  $     263  $     234  $      44   $      33
  Interior Systems..............................................................        102         99         13          15
  Building Products Distribution................................................        143        125          3           3
  Corporate.....................................................................         --         --         (7)         (8)
  Intrasegment eliminations.....................................................        (64)       (57)        --          --
                                                                                  ---------  ---------  ---------         ---
Total United States.............................................................        444        401         53          43
Total Canada....................................................................         37         41          5           5
Total Other Foreign.............................................................         55         55          7           6
Transfers between geographic areas..............................................        (22)       (23)        --          --
                                                                                  ---------  ---------  ---------         ---
Total USG Corporation...........................................................        514        474         65          54
                                                                                  ---------  ---------  ---------         ---
                                                                                  ---------  ---------  ---------         ---
</TABLE>

<TABLE>
<CAPTION>
                                                                                               NINE MONTHS ENDED
                                                                                                  SEPTEMBER 30
                                                                                  --------------------------------------------
                                                                                       NET SALES                EBITDA
                                                                                  --------------------  ----------------------
                                                                                    1993       1992       1993        1992
                                                                                  ---------  ---------  ---------     -----
<S>                                                                               <C>        <C>        <C>        <C>
United States:
  Gypsum Products...............................................................  $     728  $     670  $     108   $      80
  Interior Systems..............................................................        284        280         36          39
  Building Products Distribution................................................        387        345          5           4
  Corporate.....................................................................         --         --        (18)        (21)
  Intrasegment eliminations.....................................................       (175)      (163)        --          --
                                                                                  ---------  ---------  ---------         ---
Total United States.............................................................      1,224      1,132        131         102
Total Canada....................................................................        108        117         14          12
Total Other Foreign.............................................................        154        157         20          18
Transfers between geographic areas..............................................        (66)       (65)        --          --
                                                                                  ---------  ---------  ---------         ---
Total USG Corporation...........................................................      1,420      1,341        165         132
                                                                                  ---------  ---------  ---------         ---
                                                                                  ---------  ---------  ---------         ---
</TABLE>

                                       29
<PAGE>
UNITED STATES

    Comparing the  third  quarter of  1993  to the  third  quarter of  1992  for
domestic  Gypsum Products  (represented by  U.S. Gypsum  and USG International's
gypsum products exports), net sales increased $29 million, or 12.4%, and  EBITDA
improved  $11 million, or  33.3%. For the  first nine months  of 1993, net sales
rose $58 million,  or 8.7%, and  EBITDA increased $28  million, or 35.0%.  These
improved  results primarily reflect the  sixth consecutive quarterly increase in
gypsum wallboard selling prices. U.S. Gypsum's wallboard prices increased  10.5%
and  9.7% in the third quarter and first nine months of 1993, respectively, over
the corresponding 1992 periods.  Wallboard volume rose 1%  to a record level  in
the third quarter of 1993, while nine months 1993 volume was virtually unchanged
from  a  year ago.  In  the third  quarter  of 1993,  unit  manufacturing costs,
excluding non-cash postretirement charges, for wallboard were 3% higher than  in
the  comparable period  in 1992,  largely due to  a higher  level of maintenance
expenditures and higher energy costs in 1993. Improved sales of joint  compound,
DUROCK  cement  board  and  other  products  used  in  residential  construction
contributed to the favorable domestic Gypsum Products results.

    Net sales  for  domestic  Interior  Systems, which  is  represented  by  USG
Interiors  and  USG  International's  interior  systems  exports,  increased  $3
million, or 3.0%, and $4 million, or  1.4%, in the third quarter and first  nine
months  of 1993, respectively,  over the comparable 1992  periods. EBITDA in the
third quarter and first nine months of 1993 decreased $2 million, or 13.3%,  and
$3  million, or 7.7%, from the  respective 1992 periods. These results primarily
reflect increased sales  of lower margin  products and increased  costs for  raw
materials in 1993.

    Building Products Distribution (L&W Supply) net sales increased $18 million,
or  14.4%, and $42 million, or 12.2% in  the third quarter and first nine months
of 1993  over the  respective  1992 periods.  These increases  reflect  improved
gypsum  wallboard  selling  prices and  volume  and increased  sales  of related
building materials products. EBITDA  recorded in the third  quarter of 1993  was
unchanged  from the third  quarter of 1992.  For the first  nine months of 1993,
EBITDA increased $1  million, or 25.0%  from the comparable  1992 period.  These
results  reflect the aforementioned  sales improvements in  gypsum wallboard and
related building materials products partially offset by increased unit costs.

CANADA

    Third quarter  1993  net sales  for  the Corporation's  Canadian  operations
(primarily  CGC) declined $4 million,  or 9.8%, from the  third quarter of 1992.
Net sales for the first nine months of 1993 were down $9 million, or 7.7%,  from
1992. These declines were primarily attributable to the strengthened U.S. dollar
compared  with the Canadian dollar  and lower levels of  volume resulting from a
sluggish Canadian  construction market.  However, EBITDA  was unchanged  in  the
third  quarter of  1993 compared with  the third quarter  of 1992 and  was up $2
million, or 16.7%, in the  first nine months of 1993  versus 1992 due to  higher
selling  prices for gypsum wallboard. Canadian gypsum wallboard prices have been
impacted by the Canadian government's  finding announced earlier this year  that
dumping  of U.S.-made gypsum wallboard had occurred and the resulting imposition
of duties for a period  of five years on  gypsum wallboard imported into  Canada
from the United States at prices below certain levels.

OTHER FOREIGN

    Net   sales  for  the  Corporation's  Other  Foreign  businesses  (primarily
operations  in  Europe,   the  Pacific   and  Latin  America   managed  by   USG
International)  were unchanged  in the third  quarter of 1993  versus 1992 while
decreasing by $3 million,  or 1.9%, in  the first nine months  of 1993 from  the
comparable 1992 period. These results reflect the continuing recession in Europe
and   the  impact  of  the  strengthened  U.S.  dollar  compared  with  European
currencies. However,  EBITDA  improved slightly  in  both 1993  periods  due  to
organizational  streamlining implemented in the fourth  quarter of 1992 and from
improved cost control.

                                       30
<PAGE>
OTHER EARNINGS INFORMATION

    As a result of the Restructuring,  interest expense was reduced compared  to
prior  periods. Interest  expense of  $34 million in  the third  quarter of 1993
represents a  significant  reduction  versus  the third  quarter  of  1992  when
interest expense was $81 million.

    In connection with the Restructuring, the Corporation recorded in the period
of  January 1 through May  6, 1993 a one-time  reorganization items gain of $709
million, which primarily consisted  of an $851 million  gain from recording  the
Excess Reorganization Value pursuant to SOP 90-7.

    Income  tax expense of $3 million and  $1 million was recorded for the third
quarter and the period of May 7 through June 30, 1993, respectively. Income  tax
expense  of $17 million was recorded for the  period of January 1 through May 6,
1993. Income tax benefits  of $7 million  and $27 million  were recorded in  the
third  quarter and first  nine months of  1992, respectively. See  Note 8 of the
Notes to the Consolidated Interim Financial Statements for information on income
taxes.

    Also in connection with the  Restructuring, the Corporation recorded in  the
period  of January 1 through May 6, 1993 a one-time after-tax extraordinary gain
of $944 million resulting primarily from  the exchange of subordinated debt  for
Common Stock and warrants.

    A  one-time after-tax net charge  of $150 million was  recorded in the first
quarter of 1993 representing the cumulative  impact of the adoption of SFAS  106
and  SFAS  109. See  Notes 7  and 8  of  the Notes  to the  Consolidated Interim
Financial Statements for information related to these accounting changes.

    Net losses of $25 million and $21 million were recorded in the third quarter
and the period of May 7 through  June 30, 1993, respectively. These losses  were
attributable  to amortization  of excess  reorganization value  amounting to $43
million and  $28 million  for  the respective  periods. Such  amortization  will
continue  over the next five years. Net earnings of $1,434 million were recorded
in the period of  January 1 through May  6, 1993, reflecting the  aforementioned
reorganization  items gain and extraordinary gain. Net losses of $33 million and
$131 million were recorded in the third  quarter and first nine months of  1992,
respectively, primarily due to high levels of interest expense.

LIQUIDITY AND CAPITAL RESOURCES

WORKING CAPITAL

    As  of  September 30,  1993, working  capital  (current assets  less current
liabilities) amounted to $256 million and the ratio of current assets to current
liabilities was 1.75 to  1, a substantial improvement  versus December 31,  1992
when  current liabilities exceeded current assets  by $2.6 billion and the ratio
of current assets to current liabilities was  .21 to 1. This improvement is  due
to  the impact of  the Restructuring, which  was completed on  May 6, 1993. From
December 31, 1990 through May 6, 1993, the Corporation endured a deficit working
capital position, primarily resulting from the inclusion of most long-term  debt
issues  in current liabilities due to various  defaults upon certain of the debt
issues. Upon consummation of the Restructuring, all previously existing defaults
were waived or  cured and  long-term debt  included in  current liabilities  was
treated as follows: (i) $1.4 billion of subordinated debt, including accrued but
unpaid  interest  thereon, was  exchanged for  Common  Stock and  warrants; (ii)
certain other long-term  debt was exchanged  for new long-term  debt; and  (iii)
remaining  long-term  debt was  reclassified to  long-term liabilities.  Also in
connection with the Restructuring, the Corporation repaid $140 million principal
of a revolving credit facility in the second quarter of 1993. See Note 3 of  the
Notes   to  the   Consolidated  Interim  Financial   Statements  for  additional
information related to the Restructuring.

    On August 10, 1993, the Corporation issued $138 million of Senior 2002 Notes
in exchange for $92 million  of bank term loans  and $46 million of  capitalized
interest  notes.  The Corporation  did not  receive any  cash proceeds  from the
issuance  of  these  securities.  The  transaction  improved  the  Corporation's
financial  flexibility and responded to strong market demand for the Senior 2002
Notes by replacing near-term maturities of  the bank term loans and  capitalized
interest  notes with the longer term Senior  2002 Notes. Issuance of these notes
will cause  a  modest  increase  in  future  interest  expense  from  the  level
experienced  since the Restructuring  was consummated, but  eliminated bank term
loan aggregate

                                       31
<PAGE>
payments of $95 million due in 1994, 1995 and 1996 and all but approximately  $1
million  of  $47 million  of capitalized  interest  notes due  in 2000.  (The $3
million portion of the $95 million of bank term loans that was not exchanged for
Senior 2002 Notes was added to the final  maturity of the bank term loan due  in
2000.)  Furthermore, in connection  with this offering,  the Corporation will be
permitted, at its option, to apply up to $165 million of cash otherwise  subject
to  the cash sweep mechanism  of the Credit Agreement in  1994, 1995 and 1996 to
repayment or purchase of senior debt due  prior to January 1, 1999 or bank  term
loans,  at the discretion  of the Corporation. See  Note 10 of  the Notes to the
Consolidated  Interim  Financial  Statements   for  more  information  on   this
transaction.

    Accrued  expenses of $211  million as of  September 30, 1993  were down $342
million, or 61.8%, from the December 31, 1992 level due to the cancellation  and
discharge   of  $375  million  of  accrued   interest  in  connection  with  the
Restructuring. Inventories of $147 million  as of September 30, 1993,  increased
$34  million, or 30.1%,  from December 31,  1992 primarily due  to a fresh start
accounting adjustment.  Accounts payable  of $101  million as  of September  30,
1993,  rose $10 million, or  11.0%, from December 31,  1992 due to the increased
level of business and improving trade credit.

CASH FLOWS

    Cash flows for the period  of May 7 through  September 30, 1993 produced  an
increase  in  cash  and  cash  equivalents of  $108  million.  Cash  provided by
operating activities of $126 million was only partially offset by cash  outflows
to  investing activities  of $7  million and  the net  repayment of  debt of $11
million.

CAPITAL EXPENDITURES

    Capital expenditures amounted to $16 million in the period of May 7  through
September  30, 1993 and  $12 million in the  period of January  1 through May 6,
1993. For the first nine months of 1992, capital expenditures were $27  million.
Capital expenditure commitments for the replacement, modernization and expansion
of  operations amounted to $14  million as of September  30, 1993, compared with
$24 million as of December 31, 1992.

PROJECTED LIQUIDITY

    The  Corporation  believes  that,   as  a  result   of  completion  of   the
Restructuring  and the exchange of Senior 2002  Notes for bank debt as described
above, the Corporation's cash generated  by operations and the estimated  levels
of  liquidity  available to  the Corporation  will be  sufficient to  permit the
Corporation  to  satisfy  its  debt  service  requirements  and  other   capital
requirements  for the foreseeable future. However, the Corporation is subject to
significant business,  economic and  competitive uncertainties,  and  satisfying
such  requirements  will  require  the  continuation  of  the  recovery  in  the
Corporation's construction-based markets which  began in 1992.  There can be  no
assurance  that the Corporation's financial resources will be sufficient for the
Corporation  to  satisfy  its  debt   service  obligations  and  other   capital
requirements.

    One  of  the  Corporation's subsidiaries,  U.S.  Gypsum, is  a  defendant in
asbestos lawsuits  alleging  both  property damage  and  personal  injury.  This
litigation  has  not had  a material  effect on  the Corporation's  liquidity or
earnings. Virtually all  costs of the  Personal Injury Cases  are being paid  by
insurance.  However,  many  of  U.S.  Gypsum's  insurance  carriers  are denying
coverage for  the Property  Damage  Cases, although  U.S. Gypsum  believes  that
substantial coverage exists and the trial court in U.S. Gypsum's Coverage Action
has  so ruled (such ruling has been  appealed). In view of the limited insurance
funding currently available to U.S.  Gypsum for Property Damage Cases  resulting
from  continued resistance  by a number  of U.S. Gypsum's  insurers to providing
coverage, the effect of the asbestos  litigation on the Corporation will  depend
upon a variety of factors, including the damages sought in Property Damage Cases
that  reach trial prior to the completion  of the Coverage Action, U.S. Gypsum's
ability to successfully defend or settle  such cases, and the resolution of  the
Coverage  Action.  As a  result, management  is unable  to determine  whether an
adverse outcome in the asbestos litigation  will have a material adverse  effect
on  the  results of  operations or  the consolidated  financial position  of the
Corporation. The Corporation and certain of its subsidiaries have been  notified
by  state and federal environmental  protection agencies of possible involvement
as one of numerous  "potentially responsible parties" in  a number of  so-called
"Superfund"  sites in the  United States. The  Corporation believes that neither

                                       32
<PAGE>
these  matters   nor  any   other   known  governmental   proceeding   regarding
environmental  matters will have a material  adverse effect upon its earnings or
consolidated  financial  position.  See  "Business  --  General  Information  --
Asbestos Litigation."

1992 COMPARED WITH 1991 RESULTS OF OPERATIONS

CONSOLIDATED RESULTS

    Consolidated  net sales of $1,777 million  in 1992 increased $65 million, or
3.8%, over the  comparable 1991 level  of $1,712 million.  This increase,  which
represents  the first year-to-year  improvement in net sales  in five years, was
attributable to  increased volume  for  all major  domestic gypsum  and  related
product  lines. Demand for  these products rose  in 1992 due  to the recovery in
U.S. housing starts which were up approximately 19% over 1991. While the average
selling price of domestic  gypsum wallboard reached a  14-year low in the  first
quarter  of  1992,  prices  improved throughout  the  second,  third  and fourth
quarters of 1992 and, as a result, the average price for the full year 1992  was
down   only  1%   compared  with  1991.   However,  continuing   low  levels  of
nonresidential construction  activity  have had  an  unfavorable impact  on  the
Corporation's   domestic  interior   systems  business,   and  its  non-domestic
businesses have had a difficult year due to recessions in Canada and Europe.

    Consolidated gross profit as  a percentage of net  sales in 1992 was  17.8%,
down  from 19.1%  in 1991.  This decline  primarily reflects  decreased Canadian
gypsum wallboard prices and lower margins for interior systems products,  offset
in part by improved margins for domestic gypsum and related products.

    Consolidated  selling and  administrative expenses  of $218  million in 1992
increased $24 million, or 12.4%, over 1991 expenses of $194 million. The  higher
level  of 1992  expenses primarily  reflects (i)  increases in  compensation and
benefits (up $10  million); (ii) a  fourth quarter 1992  charge associated  with
organizational  streamlining  activities ($6  million);  (iii) rent,  a non-cash
expense until  1994,  and  other  expenses associated  with  the  new  corporate
headquarters  building  ($3 million  combined);  and (iv)  expansion  of certain
international operations (up $1 million). Selling and administrative expenses as
a percentage of net sales was 12.3% in 1992, up from 11.3% in 1991.

    Consolidated operating profit of $99  million in 1992 declined $34  million,
or  25.6%, from the comparable 1991 level  of $133 million. This decline was the
result of the aforementioned lower gross margin performance and higher level  of
selling and administrative expenses.

    Interest  expense of $334 million in  1992 rose slightly over the comparable
1991 level of  $333 million.  In 1992, higher  levels of  interest expense  were
incurred  on (i) senior subordinated debentures (up $11 million) due to a higher
level of  arrearage  on  such debentures  in  1992  as a  result  of  a  default
condition;  and (ii) junior  subordinated debentures (up $10  million) due to an
increased level of  such pay-in-kind  debentures in 1992.  These increases  were
offset  to  a  large  extent  by  lower  interest  rates  related  to  bank debt
obligations (down $20 million).

    An income tax benefit of $33 million was recorded in 1992 due to losses from
continuing operations. This benefit is net of tax expense on foreign  subsidiary
earnings. The effective income tax benefit rate was 15.0% for 1992 compared with
27.5%  for the  year-earlier period. The  lower 1992 effective  benefit rate was
primarily due  to  the  inability  to  fully  benefit  the  net  operating  loss
carryforward ("NOL Carryforward") as an offset to deferred taxes. Deferred taxes
were  reduced by $5 million during 1991  for an NOL Carryforward of $14 million.
In 1992, deferred taxes  were reduced by  an additional $19  million for an  NOL
Carryforward of $140 million, of which $84 million was unbenefited.

    A  net loss of $191 million was recorded in 1992 compared with a net loss of
$161 million in  1991. The net  loss in  1991 included a  $20 million  after-tax
provision  relating  to  the  sale of  the  Corporation's  subsidiary,  DAP Inc.
("DAP").

                                       33
<PAGE>
UNITED STATES

    Net  sales  of  $1,505  million  in  1992  for  the  Corporation's  domestic
operations were up $72 million, or 5.0%, over 1991 net sales of $1,433  million.
However,  domestic  operating profit  of $76  million  declined $13  million, or
14.6%, from the 1991  level of $89 million.  EBITDA for domestic operations  was
$123  million in  1992, down  $14 million,  or 10.2%,  from 1991  EBITDA of $137
million. Results  for  the  industry segment  components  of  the  Corporation's
domestic operations were as follows:

<TABLE>
<CAPTION>
                                                                                    DEPRECIATION
                                                                                    DEPLETION AND
                                                                   OPERATING
                                               NET SALES            PROFIT          AMORTIZATION          EBITDA
                                          -------------------   ---------------   -----------------   ---------------
                                            1992       1991      1992     1991     1992      1991      1992     1991
                                          --------   --------   ------   ------   -------   -------   ------   ------
                                                                     (DOLLARS IN MILLIONS)
<S>                                       <C>        <C>        <C>      <C>      <C>       <C>       <C>      <C>
United States:
  Gypsum Products.......................  $    889   $    835   $  69    $  64    $   30    $   29    $   99   $  93
  Interior System.......................       368        386      34       47        13        12        47      59
  Building Products Distribution........       464        424       3       --         2         4         5       4
  Intrasegment elimination..............      (216)      (212)     --       --        --        --        --      --
  Corporate.............................        --         --     (30)     (22)        8        10       (28)    (19)
                                          --------   --------   ------   ------   -------   -------   ------   ------
    Total...............................     1,505      1,433      76       89        53        55       123     137
                                          --------   --------   ------   ------   -------   -------   ------   ------
                                          --------   --------   ------   ------   -------   -------   ------   ------
</TABLE>

    Net  sales of $889 million in 1992 for domestic Gypsum Products (represented
by U.S. Gypsum  and USG  International's gypsum  products exports)  were up  $54
million,  or  6.5%,  versus  the  1991 level  of  $835  million.  Following five
successive years of sales declines, U.S. Gypsum recorded increased sales in 1992
versus 1991. This improvement was attributable to increased volume for all major
product lines. Gypsum wallboard volume rose 8% as demand in the gypsum wallboard
industry increased  in conjunction  with the  recovery in  U.S. housing  starts.
Domestic  Gypsum Products operating profit of  $69 million increased $5 million,
or 7.8%, over  the prior-year  amount of  $64 million.  U.S. Gypsum's  increased
volume  levels and  lower unit  costs (down 2%  for gypsum  wallboard) more than
offset the combination of slightly  lower gypsum wallboard selling prices  (down
1%)  and  increased selling  and administrative  expenses.  The higher  level of
selling  and   administrative  expenses   primarily  resulted   from   increased
compensation and benefits, a fourth quarter 1992 charge of $4 million associated
with  organizational  streamlining  activities and  an  increased  provision for
doubtful accounts.

    Average realized selling prices on  U.S. Gypsum's gypsum wallboard  declined
in  1992 for the seventh consecutive year and reached a 14-year low in the first
quarter of 1992. Production capacity in the gypsum industry remained quite  high
relative  to demand, and uncertainty about the timing and strength of a recovery
led to very competitive pricing in 1992.  However, as shown in the table  below,
gypsum  wallboard pricing began an  upward trend in the  second quarter of 1992,
which continued in the third and fourth quarters.

    Quarterly domestic gypsum wallboard average prices per thousand square  feet
in 1992 compared with 1991 were as follows:

<TABLE>
<CAPTION>
                                                                             1992       1991
                                                                           ---------  ---------
<S>                                                                        <C>        <C>
First Quarter............................................................  $   67.77  $   77.05
Second Quarter...........................................................      72.20      71.93
Third Quarter............................................................      73.03      71.32
Fourth Quarter...........................................................      73.35      70.19
</TABLE>

    Domestic   Interior   Systems  (represented   by   USG  Interiors   and  USG
International's interior systems exports) reported net sales of $368 million  in
1992,  a decline of $18 million, or 4.7%, from the comparable 1991 level of $386
million. Operating profit of $34 million for domestic Interior Systems was  down
$13 million, or 27.7%, from $47 million recorded in 1991. These declines reflect
the  continuing downturn in new  nonresidential construction, the primary market
served by USG Interiors. In 1992, opportunity

                                       34
<PAGE>
from new nonresidential  construction, as  measured by  lagged contract  awards,
declined  by approximately 19%. Consequently, results for most of USG Interiors'
product lines  were adversely  affected by  lower selling  prices and  decreased
volume.  Higher  selling  and  administrative  expenses  were  recorded  by  USG
Interiors primarily due to a fourth quarter 1992 charge of $1 million associated
with organizational  streamlining  activities  and  increased  compensation  and
benefits.

    Building  Products Distribution (represented by L&W Supply) had net sales of
$464 million in 1992, an increase of  $40 million, or 9.4%, over the  comparable
1991  level of $424  million. Operating profit  of $3 million  in 1992 surpassed
breakeven operating profit  last year. Demand  for all of  L&W Supply's  product
lines  rose in  1992 in  response to  the increase  in U.S.  housing starts. L&W
Supply's gypsum wallboard volume increased 9%  over 1991, while sales and  gross
profit  for  its  other  products, particularly  ceiling  products,  roofing and
construction metal, also exceeded 1991 levels. While L&W Supply's average gypsum
wallboard price for 1992 was down slightly from 1991, improving prices from  the
second  quarter of  1992 through the  end of  the year paralleled  that for U.S.
Gypsum.

    Corporate expenses of $30  million in 1992 increased  $8 million, or  36.4%,
over  1991 expenses  of $22 million.  This increase primarily  reflects rent and
other expenses associated with  the new corporate  headquarters, the absence  in
1992  of  certain service  transfers  to the  operating  subsidiaries, increased
compensation and benefits and a $1 million charge associated with organizational
streamlining activities.

CANADA

    The 1992 performance of  the Corporation's Canadian operations  (represented
primarily  by  CGC)  was  adversely affected  by  limited  market opportunities.
Consequently, net sales of  $149 million and operating  profit of $7 million  in
1992  fell $20 million, or 11.8%, and  $15 million, or 68.2%, respectively, from
the corresponding 1991  levels. These  declines were  primarily attributable  to
unfavorable  changes in selling prices and  volume for CGC's gypsum wallboard as
the Canadian economy remained weak and CGC's customers maintained inventories at
low levels. Gypsum  wallboard pricing  for CGC, as  well as  for other  Canadian
manufacturers, was also adversely affected by competition from lower-priced U.S.
imports.  The Canadian  government has  announced that,  in connection  with its
finding that dumping of U.S.-made gypsum wallboard had occurred, duties will  be
imposed  on all gypsum wallboard imported into  Canada from the United States at
prices below certain  levels for a  period of five  years. Also affecting  CGC's
1992  results  was the  continuing decline  in Canadian  commercial construction
which resulted  in lower  net  sales and  operating  profit for  CGC's  interior
systems business.

OTHER FOREIGN

    Net  sales and operating profit  in 1992 were $208  million and $16 million,
respectively, for  the Corporation's  Other Foreign  operations in  Europe,  the
Pacific  and Latin  America which  are managed by  USG International,  and for a
shipping subsidiary  headquartered in  Bermuda. These  results represent  a  net
sales  increase of $15 million,  or 7.8%, and an  operating profit decline of $6
million, or 27.3%, versus  1991. The improvement in  net sales largely  reflects
increases  in  sales of  interior systems  products  in certain  European, Latin
America, Middle  East and  Pacific  markets, as  well  as a  favorable  currency
translation.  However,  the  decline  in  operating  profit  resulted  from  the
combination of (i) a slowdown in demand due to a severe and expanding  recession
affecting  most of  Europe; (ii) continuing  costs associated  with the Aubange,
Belgium ceiling tile plant that opened in 1991; and (iii) increased selling  and
administrative  expenses due to a higher  level of compensation and benefits and
expansion of certain international operations.

DISCONTINUED OPERATIONS

    Results for DAP are set forth  separately as discontinued operations in  the
consolidated  financial  statements  and  supplementary  data  schedules  up  to
September 20, 1991, when the Corporation completed the sale of the business  and
substantially  all of the assets  of DAP. See "Index  To Financial Statements --
Significant Accounting Policies  and Practices --  Discontinued Operations"  for
information relating to this transaction.

                                       35
<PAGE>
1991 COMPARED WITH 1990 RESULTS OF OPERATIONS

CONSOLIDATED RESULTS

    Consolidated  net sales from continuing operations of $1,712 million in 1991
were down $203 million, or  10.6%, from the 1990  level of $1,915 million.  This
decline reflects lower levels of new residential and nonresidential construction
activity  in 1991 versus 1990 which had an  adverse effect on demand for many of
the Corporation's product lines. As a result, average selling prices on domestic
gypsum wallboard  declined in  1991  for the  sixth  consecutive year.  While  a
cyclical downturn in construction-based markets began in 1987, the deterioration
in  these markets from  mid-1990 through the  end of 1991  had been particularly
rapid and acute.

    Consolidated gross profit as  a percentage of net  sales in 1991 was  19.1%,
down  from  21.7% in  1990  primarily due  to  gypsum wallboard's  lower selling
prices.

    For the fourth  consecutive year,  the Corporation  was able  to reduce  its
selling  and  administrative  expenses,  as expenses  of  $194  million  in 1991
represented a $9 million, or 4.4%, reduction from 1990 expenses of $203 million.
Decreased expenses in 1991 primarily reflected lower levels of compensation  and
benefits  as a  result of  employee reductions,  most of  which occurred  in the
latter  part  of  1990.  However,  selling  and  administrative  expenses  as  a
percentage of net sales in 1991 increased to 11.3% from 10.6% in 1990 due to the
decline in net sales.

    In  the  fourth quarter  of 1990,  restructuring  expenses amounting  to $18
million were  recorded,  primarily for  the  implementation of  a  program  that
improved operating efficiencies in each of the Corporation's businesses.

    Consolidated  operating profit of $133 million in 1991 was down $62 million,
or 31.8%, from the 1990 level of $195 million as a result of the  aforementioned
lower levels of volume and gross margin performance.

    Interest  expense of $333  million in 1991 increased  $41 million, or 14.0%,
over 1990. This was largely  due to a $23  million increase in interest  expense
incurred  on the Bank Debt Obligations as  a result of the default condition and
increased borrowings on the Revolving Credit Facility made in the fourth quarter
of 1990 and still  outstanding as of  December 31, 1991.  In addition, a  higher
level  of pay-in-kind  junior subordinated debentures  resulted in  a $9 million
increase in interest expense, while default  interest in 1991 related to  senior
subordinated debentures amounted to $7 million.

    While  there were no nonrecurring gains  in 1991, the Corporation recorded a
nonrecurring  pre-tax  gain  of  $34  million  on  the  sale  of  its  corporate
headquarters  building in  the first  quarter of  1990. See  "Index To Financial
Statements --  Significant Accounting  Policies  and Practices  --  Nonrecurring
Gain" for additional information related to this transaction.

    An income tax benefit of $53 million was recorded in 1991 due to a loss from
continuing  operations. This benefit is net of tax expense on foreign subsidiary
earnings. The effective income tax benefit rate for 1991 was 27.5% compared with
9.8% for 1990.

    A net loss of $161 million was recorded in 1991, compared with a net loss of
$90 million  in  1990.  The net  losses  in  1991 and  1990  included  after-tax
provisions of $20 million and $41 million, respectively, relating to the sale of
DAP.

UNITED STATES

    Net  sales  of  $1,433  million  in  1991  for  the  Corporation's  domestic
operations were  down $170  million, or  10.6%, from  1990 net  sales of  $1,603
million.  Domestic  operating profit  of $89  million  declined $50  million, or
36.0%, from the 1990 level of  $139 million. EBITDA for domestic operations  was
$137  million in  1991, down  $74 million,  or 35.1%,  from 1990  EBITDA of $211
million. Results  for  the  industry segment  components  of  the  Corporation's
domestic operations are explained as follows.

    Net  sales of $835  million in 1991  for domestic Gypsum  Products were down
$101 million, or 10.8%, versus the 1990 level of $936 million. Operating  profit
of $64 million in 1991 was down $52 million, or

                                       36
<PAGE>
44.8%,  from $116 million  recorded in 1990.  These declines primarily reflected
lower levels of gypsum  wallboard volume (down 7%)  and prices (down 8%)  versus
1990  for U.S.  Gypsum. Reduced  opportunity for  domestic gypsum  wallboard and
other building products in 1991 was reflective of a 15% decline in U.S.  housing
starts  compared with  1990. However,  with respect  to operating  profit, these
factors were partially offset by U.S.  Gypsum's excellent control of unit  costs
which  were  unchanged from  1990 and  by a  2.5% reduction  in its  selling and
administrative  expenses.  In  addition,  U.S.  Gypsum  incurred   restructuring
expenses  of $7 million in the fourth quarter  of 1990, while there were no such
expenses in 1991.

    Net sales of $386 million in 1991 for domestic Interior Systems declined $37
million, or 8.7%, from the 1990 level of $423 million, while operating profit of
$47 million  was down  $7  million, or  13.0%, versus  the  1990 amount  of  $54
million.  Net sales  and operating  profit in  1991 for  most of  USG Interiors'
product lines were down from 1990 due to lower volume resulting from softness in
nonresidential  construction.  However,   the  impact   of  declining   economic
opportunities  for USG Interiors  was mitigated somewhat by  a 6.9% reduction in
its 1991 selling and  administrative expenses as  compared with 1990.  Operating
profit in 1990 for the USG Interiors was lowered by restructuring expenses of $4
million, while there were no such expenses in 1991.

    Net  sales of $424  million in 1991 for  Building Products Distribution were
down $54  million, or  11.3%, from  the 1990  level of  $478 million.  Breakeven
results  were experienced at the operating profit  level in 1991 for L&W Supply,
compared with operating profit of $4  million in 1990. Operating profit in  1990
for  L&W Supply included restructuring expenses  of $2 million, while there were
no such expenses in  1991. As a  result of depressed  market conditions for  its
products  and intense competition  from independent distributors,  net sales and
operating profit  declines  were recorded  for  virtually all  of  L&W  Supply's
product lines in 1991 compared with 1990.

CANADA

    Net sales in 1991 for the Corporation's Canadian operations amounted to $169
million  and  operating profit  was $22  million,  representing declines  of $26
million,  or  13.3%,  and   $9  million,  or   29.0%,  respectively,  from   the
corresponding  1990 levels. CGC's performance in  1991 suffered due to decreases
in gypsum  wallboard  volume  and  selling  prices.  This  trend  reflected  the
continuing  weakness in  the Canadian economy,  and in  particular, the building
products sector which had to deal with surplus capacity and lower-priced  gypsum
products  imported from the United States. However, average unit costs for CGC's
gypsum wallboard were reduced slightly from 1990 and selling and  administrative
expenses  for CGC's gypsum business  were reduced 1.8% in  1991 versus the prior
year. Results for CGC's interior systems business  were down in 1991 due to  the
slowdown in Canadian nonresidential construction.

OTHER FOREIGN

    Net  sales and operating profit  in 1991 were $193  million and $22 million,
respectively, for  the Corporation's  Other  Foreign operations.  These  results
represent  a net  sales decline  of $7 million,  or 3.5%,  and a  $3 million, or
12.0%, drop in  operating profit  versus 1990.  Net sales  and operating  profit
reported  by USG International were down  primarily due to the weakening economy
in Europe. Start-up  costs associated with  the opening in  mid-1991 of its  new
ceiling  tile plant in Aubange, Belgium also  had an adverse effect on operating
profit.

                                       37
<PAGE>
                                    BUSINESS

INTRODUCTION

    Through  its  subsidiaries,  USG  is  a  leading  manufacturer  of  building
materials  in North America which  produces a wide range  of products for use in
residential and nonresidential construction, repair  and remodeling, as well  as
products  used  in  certain industrial  processes.  U.S. Gypsum  is  the largest
producer  of  gypsum  wallboard   in  the  United   States  and  accounted   for
approximately  one-third of total  domestic gypsum wallboard  sales in 1992. USG
Interiors is a  leading supplier of  interior ceiling, wall  and floor  products
used  primarily  in  commercial applications.  In  1992, USG  Interiors  was the
leading producer of ceiling grid and the second largest producer of ceiling tile
in the United States, accounting  for over one-half and approximately  one-third
of  total  domestic sales  of  such products,  respectively.  L&W Supply  is the
largest distributor of wallboard and related  products in the United States  and
in  1992  sold  approximately  23% of  U.S.  Gypsum's  wallboard  production. In
addition  to  its  United  States   operations,  the  Corporation's  76%   owned
subsidiary,  CGC,  is the  largest manufacturer  of  gypsum products  in eastern
Canada and the  Corporation's USG International  unit supplies interior  systems
and  gypsum wallboard products in the Pacific,  Europe and Latin America. In the
nine months ended  September 30,  1993, the Corporation  had net  sales of  $1.4
billion  and generated EBITDA  of $165 million.  In the year  ended December 31,
1992, the Corporation had net sales of $1.8 billion and generated EBITDA of $159
million.

    The Corporation believes that  its leading industry  positions and low  cost
structure  position it to take advantage of the long-term potential in its three
industry segments:  Gypsum  Products,  Interior Systems  and  Building  Products
Distribution.

U.S. INDUSTRY OVERVIEW

    USG's consolidated financial performance is largely influenced by changes in
the  three major components  of the construction industry  in the United States:
new residential construction,  new nonresidential construction,  and repair  and
remodel   activity.  In   recent  years,   structural  changes   in  residential
construction activity combined with growth  in the repair and remodel  component
have  partially mitigated the impact  of the cyclical demand  of the overall new
construction components.

NEW RESIDENTIAL AND NONRESIDENTIAL CONSTRUCTION

    Demand for  the  Corporation's  products has  historically  been  influenced
primarily  by new residential (single and multi-family homes) and nonresidential
(offices, schools, stores,  and other  institutions) construction.  Construction
activity is directly influenced by a variety of economic variables. In the short
term,  the  new residential  segment  is characterized  by  fluctuating activity
levels as builders  and buyers  respond to changes  in funding  costs, new  home
prices,  and the availability of new  construction financing. Over the medium to
long term, new residential construction  activity reflects the demand  generated
by household formations, the home ownership rate, removals of housing stock, and
the growth of personal income.

    Although  new residential construction remains  the largest single source of
demand for gypsum wallboard in the United States, it has declined  significantly
as a percentage of gypsum wallboard demand since 1985 (a year where total gypsum
wallboard  shipments were  comparable to 1992  levels). Residential construction
has a nominal  impact on demand  for Interiors Systems  products. The  following
table  sets forth demand  for gypsum wallboard  in the United  States by end-use
segment as estimated by U.S. Gypsum  based on publicly available data,  internal
surveys  and  data  from  the  Gypsum  Association,  an  industry  trade  group.
Management estimates  that the  distribution of  U.S. Gypsum's  sales volume  to
these four end-use segments is generally proportional to industry demand.

<TABLE>
<CAPTION>
                                                                                   1992       1985
                                                                                 ---------  ---------
<S>                                                                              <C>        <C>
Residential construction.......................................................         46%        52%
Nonresidential construction....................................................         10         11
Repair and remodel.............................................................         36         31
Export/other...................................................................          8          6
</TABLE>

                                       38
<PAGE>
    Over  recent economic cycles, demand for gypsum wallboard has been favorably
impacted by a shift toward more single family housing within the new residential
construction segment and an increase in the average single family home size. New
single family  homes,  which  typically  require  twice  as  much  wallboard  as
multi-family  homes,  accounted for  86%  of total  housing  starts in  1992, as
compared to 62%  in 1985. Additionally,  the size of  the average single  family
home  in the United States has increased  approximately 17% to 2,095 square feet
in 1992 from 1,785 square  feet in 1985. Largely as  a result of these  factors,
United  States industry shipments  of gypsum wallboard  were 20.3 billion square
feet in 1992, as compared  to 20.1 billion in  1985, despite an approximate  31%
decline  in the number of  housing starts from 1.7 million  units in 1985 to 1.2
million units in 1992, as depicted in the following chart.

                      GYPSUM WALLBOARD INDUSTRY SHIPMENTS
                            AND TOTAL HOUSING STARTS

<TABLE>
<CAPTION>
                                1982   1983   1984   1985   1986   1987   1988   1989   1990   1991   1992
                                -----  -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
<S>                             <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Gypsum Wallboard Industry
  shipments, in billions of
  square feet                    13.3   17.1   19.2   20.2   21.3   21.4   21.3   21.3   20.7   18.4   20.3
Housing Starts, in thousands
  of units                      1,062  1,703  1,750  1,742  1,805  1,621  1,488  1,376  1,193  1,014  1,200
</TABLE>


    SOURCES: HOUSING STARTS ARE BASED  ON DATA PUBLISHED BY  THE U.S. BUREAU  OF
             THE  CENSUS. GYPSUM WALLBOARD INDUSTRY  SHIPMENTS ARE BASED ON DATA
             PUBLISHED BY THE GYPSUM ASSOCIATION.

    Nonresidential construction  responds less  quickly to  changes in  interest
rates  than  residential construction  because  long-term financing  is normally
arranged in  advance of  the commencement  of major  building projects.  In  the
longer  term, nonresidential construction  activity levels are  also affected by
the general  rate  of  economic  growth,  the rate  of  new  job  formation  and
population shifts. Continued weakness in the nonresidential construction segment
has negatively impacted demand for the products manufactured by both U.S. Gypsum
and  USG Interiors. Demand for USG Interiors' products is particularly dependent
on  new  nonresidential   construction  activity.   Management  estimates   that
approximately   one-half  of  USG   Interiors'  1992  sales   were  in  the  new
nonresidential construction segment as  compared to approximately two-thirds  in
1986 (the year in which USG Interiors was established as a separate subsidiary).
In   recent  years,   nonresidential  construction  demand   has  accounted  for
approximately 10% of gypsum wallboard industry demand in the United States.

REPAIR AND REMODEL

    Based on data published by  the U.S. Bureau of The  Census, the size of  the
total  residential repair and remodel  market grew to $104  billion in 1992 from
$80 billion in  1985 and $46  billion in 1980.  Although data on  nonresidential
repair  and remodel activity is not  readily available, management believes that
this segment grew significantly during the  1980s. The growth of the repair  and
remodel  market is primarily  due to the  aging of housing  stock, remodeling of
existing buildings and tenant

                                       39
<PAGE>
turnover in commercial space. The  median age of housing  stock was 27 years  in
1990, and the National Association of Homebuilders forecasts that the median age
will  increase to 32 years by 2000. Management believes that the continued aging
of housing stock  will contribute to  further growth in  the repair and  remodel
segment.  In addition,  management believes that  the increase in  the number of
commercial buildings  over the  last  decade will  provide  a greater  base  for
nonresidential  repair and remodel activity in the future, as building owners or
tenants replace ceiling, wall and floor  systems as part of the tenant  turnover
process. Demand in the repair and remodel component tends to be more stable than
in  new construction, although it does fluctuate somewhat in response to general
economic conditions.

    Management estimates that repair and remodel demand for gypsum wallboard has
increased more than  18% since 1985  and, in  1992, accounted for  36% of  total
demand  for gypsum  wallboard in  the United  States. Management  estimates that
approximately one-half of USG Interiors'  1992 sales were in the  nonresidential
repair and remodel segment.

GYPSUM PRODUCTS

BUSINESS

    The  Gypsum Products segment consists primarily  of the gypsum operations of
U.S. Gypsum in the United States, CGC in Canada and USG International in Mexico.

    CGC is  the largest  manufacturer  of gypsum  wallboard in  eastern  Canada.
Management  estimates  that  industry  sales in  eastern  Canada,  including the
Toronto and Montreal metropolitan  areas, represent approximately two-thirds  of
total  Canadian sales  volume. In 1992,  CGC accounted for  approximately 43% of
industry sales in eastern Canada.

PRODUCTS

    The Gypsum Products segment manufactures and markets building and industrial
products used in a  variety of applications. Gypsum  panel products are used  to
finish  the interior  walls and ceilings  in residential,  commercial and mobile
home construction. These products  provide aesthetic as well  as sound and  fire
retarding  value. The majority of these  products are sold under the "SHEETROCK"
brand name.  Also sold  under the  "SHEETROCK" brand  name is  a line  of  joint
compounds used for finishing wallboard joints. The "DUROCK" line of cement board
and accessories is produced to provide fire-resistant and water damage resistant
assemblies  for both  interior and  exterior construction.  The Corporation also
produces a  variety of  plaster products  used to  provide a  custom finish  for
residential  and commercial  interiors. Like "SHEETROCK"  brand wallboard, these
products provide aesthetic and  sound and fire  retarding value. These  products
are  sold under  the trade  names of  "RED TOP,"  "IMPERIAL" and  "DIAMOND." The
Corporation also  produces  gypsum  based  products  sold  to  agricultural  and
industrial  customers  for  use  in a  number  of  applications,  including soil
conditioning, road repair, fireproofing and ceramics.

FINANCIAL PERFORMANCE

    Summary financial results of the Gypsum Products segment are outlined in the
table below. Such results are  not adjusted for intersegment sales  eliminations
and corporate expenses.

<TABLE>
<CAPTION>
                                  1992        1991        1990        1989        1988
                                ---------   ---------   ---------   ---------   ---------
                                                  (DOLLARS IN MILLIONS)
<S>                             <C>         <C>         <C>         <C>         <C>
Net sales.....................     $1,068      $1,011      $1,134      $1,263      $1,367
Operating profit..............         85          93         148         227         266
EBITDA........................        123         131         194         266         307
EBITDA margin.................       11.5%       13.0%       17.1%       21.1%       22.5%
Capital expenditures..........         31          25          25          41          60
</TABLE>

    See  "Selected Consolidated  Financial Data." For  additional information on
the Corporation's  results by  industry  segment, including  intersegment  sales
eliminations  and  corporate expenses,  see  "Index to  Financial  Statements --
Significant Accounting Policies and Practices."

                                       40
<PAGE>
MANUFACTURING

    Gypsum products  are  produced  by  the Corporation  at  26  plants  located
throughout  the  United  States,  Eastern  Canada  and  in  central  Mexico. The
Corporation believes  several  factors contribute  to  its low  delivered  cost,
including  (i) the  vertical integration  of its  key raw  materials (gypsum and
paper); (ii)  the technical  expertise provided  by its  extensive research  and
development efforts and its experienced employees and (iii) the proximity of its
plants to major metropolitan areas.

    USG's vertically integrated gypsum and paper operations provide several cost
and  quality advantages. Since the Corporation  obtains substantially all of its
gypsum requirements  from its  own quarries  and mines,  it controls  the  cost,
quality  and  continuity of  its supply.  These factors  are vital  to producing
wallboard of  a consistently  high  quality at  a  low cost.  The  Corporation's
geologists  estimate that recoverable rock reserves are sufficient for more than
30 years of operation  based on the Corporation's  average annual production  of
crude  gypsum during the past five  years. Proven reserves contain approximately
252 million tons, of  which approximately 69% are  located in the United  States
and  31% in Canada. Additional reserves  of approximately 153 million tons exist
on three properties  not in  operation. The Corporation's  total average  annual
production  of crude gypsum in the United States and Canada during the past five
years was 9.6 million tons.

    USG owns and  operates seven modern  paper mills located  across the  United
States  for efficient  distribution of paper  to virtually all  of its wallboard
plants. These mills  have sufficient capacity  to satisfy virtually  all of  the
Corporation's  expected paper needs for the  foreseeable future. All these mills
presently are  designed to  produce paper  utilizing 100%  recycled waste  paper
fiber  as  opposed to  more costly  virgin pulp.  Vertical integration  in paper
ensures a  continuous supply  of high  quality  paper that  is tailored  to  the
specific needs of USG's wallboard production processes.

    As  the  leading producer  of gypsum  products  for over  90 years,  USG has
developed extensive knowledge  of gypsum and  the processes used  in making  its
products.  Combined with USG's experienced work force, USG's technical expertise
provides significant cost  efficiencies in the  production of existing  products
and  development of new ones. USG maintains the largest research and development
facility in the gypsum  industry in Libertyville,  Illinois which conducts  fire
and  structural  testing  and  product  and  process  development.  Research and
development activities involve  technology related to  gypsum, cellulosic  fiber
and  cement as the  primary raw materials  on which panel  products and systems,
such as gypsum board and cement board, are based. Related technologies are those
pertaining to joint  compounds and textures  for wallboard finishing,  specialty
plaster products for both construction and industrial applications, coatings and
latex polymers.

    The  number and location of the Corporation's gypsum plants enhance its cost
position by  minimizing  the distance  and  the transportation  costs  to  major
metropolitan  areas. Transportation  costs can  be a  significant part  of total
delivered cost of gypsum products.

MARKETING AND DISTRIBUTION

    Distribution is carried  out through L&W  Supply's 130 distribution  centers
located  in  33  states, as  well  as  mass merchandisers  and  other retailers,
building  material  dealers,  contractors  and  distributors.  Sales  of  gypsum
products are seasonal to the extent that sales are generally greater from spring
through the middle of autumn than during the remaining part of the year.

COMPETITION

    The  Corporation competes in North America as the largest of 18 producers of
gypsum wallboard products and, in 1992, accounted for approximately one-third of
total gypsum  wallboard sales  in  the United  States.  In 1992,  U.S.  Gypsum's
shipments  of gypsum  wallboard totaled  7.2 billion  square feet  compared with
total domestic  industry  shipments  of  20.3  billion  square  feet.  Principal
competitors  in the United States and Canada are: National Gypsum Company, which
emerged from Chapter 11 bankruptcy in July 1993, The Celotex Corporation,  which
has  operated under Chapter 11 of the  Bankruptcy Code since 1990, Domtar, Inc.,
Georgia-Pacific Corporation  and several  smaller, regional  competitors.  Major
competitors of CGC in Eastern Canada include Domtar, Inc. and Westroc Industries
Ltd.

                                       41
<PAGE>
INTERIOR SYSTEMS

BUSINESS

    The Interior Systems segment consists of USG Interiors in the United States,
USG International in Europe, the Pacific and Latin America and CGC in Canada.

    The  Corporation has increased its emphasis on the interior systems business
since 1986 when  Donn Inc. ("Donn"),  a manufacturer of  ceiling grid and  other
interior   products,  was  acquired.  Already   second  behind  Armstrong  World
Industries, Inc. in the ceiling tile market, the acquisition of Donn  positioned
the  Corporation as the  worldwide leader in ceiling  suspension systems and the
only company to offer complete pre-designed, pre-engineered and fully integrated
ceiling systems. With the acquisition of Donn, USG Interiors was established  as
a  separate  subsidiary to  combine the  operations of  Donn and  USG Acoustical
Products Company, formerly part of U.S. Gypsum and a leading producer of mineral
fiber ceiling products.

    USG's international position  was enhanced  in late  1987 when  it began  to
export ceiling tile to Europe to complement Donn's established grid business and
to  capitalize  on  the  strength  of  its  existing  distribution  channels. By
combining ceiling tile and  grid as a system  for distributors and  contractors,
USG has used its leading position in grid to advance sales of ceiling tile. As a
result,  management  estimates that  USG's share  of  the European  ceiling tile
market has grown to  approximately 8%. International  sales are managed  through
USG  International on  a regional  basis consisting  of Europe,  the Pacific and
Latin America.

    CGC manufactures and markets ceiling products and wall and floor systems and
accounted for over one-half of  Canadian grid sales in  1992. CGC is the  second
largest  marketer of ceiling tile in  Canada, behind Armstrong World Industries,
Inc., and accounted for approximately 25% of Canadian sales of such products  in
1992. CGC markets ceiling tile produced by USG Interiors.

PRODUCTS

    The  Interior Systems  segment manufactures  and markets  ceiling suspension
systems ("grid")  and  ceiling tile,  access  floor systems,  wall  systems  and
mineral  wool insulation  and soundproofing  products. USG's  integrated line of
ceiling products provide qualities such  as sound absorption, fire  retardation,
and  convenient  access  to  the  space above  the  ceiling  for  electrical and
mechanical systems, air distribution  and maintenance. The Corporation  believes
its   ability  to  provide  custom-designed  and  specially  fabricated  ceiling
solutions to meet  specific job design  installation conditions is  increasingly
attractive   to  architects,  designers  and  building  owners.  USG  Interiors'
significant trade names include the "ACOUSTONE" and "AURATONE" brands of ceiling
tile and the "DX," "FINELINE," "CENTRICITEE" and "DONN" brands of ceiling grid.

    USG's wall systems provide  the versatility of an  open floor plan with  the
privacy  of floor-to-ceiling partitions which are compatible with leading office
equipment and  furniture systems.  Wall  systems are  designed to  be  installed
quickly  and reconfigured easily. In addition, USG manufactures a line of access
floor systems  that  permit  easy  access  to  wires  and  cables  for  repairs,
modifications, and upgrading of electrical and communication networks as well as
convenient movement of furniture and equipment.

FINANCIAL PERFORMANCE

    Summary  financial results for the Interior  Systems segment are outlined in
the  table  below.  Such  results  are  not  adjusted  for  intersegment   sales
eliminations and corporate expenses.

<TABLE>
<CAPTION>
                                 1992      1991     1990     1989     1988
                                -------   ------   ------   ------   ------
                                           (DOLLARS IN MILLIONS)
<S>                             <C>       <C>      <C>      <C>      <C>
Net sales.....................     $548     $576     $624     $610     $599
Operating profit..............       41       62       78       89       83
EBITDA........................       59       78       98      105       98
EBITDA margin.................     10.8%    13.5%    15.7%    17.2%    16.4%
Capital expenditures..........       14       22       37       33       17
</TABLE>

                                       42
<PAGE>
    See  "Selected Consolidated  Financial Data." For  additional information on
the Corporation's  results by  industry  segment, including  intersegment  sales
eliminations  and  corporate expenses,  see  "Index to  Financial  Statements --
Significant Accounting Policies and Practices."

MANUFACTURING

    Interior Systems products  are manufactured  at 16  plants throughout  North
America,  including  5  ceiling  tile  plants and  4  ceiling  grid  plants. The
remaining plants produce other interior  products and raw materials for  ceiling
tile  and  grid. Principal  raw  materials used  in  the production  of Interior
Systems  products  include  mineral   fiber,  steel,  aluminum  extrusions   and
high-pressure laminates. Certain of these raw materials are produced internally,
while  others  are obtained  from various  outside  suppliers. Shortages  of raw
materials used in this segment are not expected.

    USG Interiors maintains its own  research and development facility in  Avon,
Ohio,  which  provides  product  design,  engineering  and  testing  services in
addition to manufacturing development, primarily in metal forming, with tool and
machine design and construction services. Additional research and development is
carried  out  at   the  Corporation's   research  and   development  center   in
Libertyville, Illinois and at its "Solutions Center"-SM- in Chicago.

MARKETING AND DISTRIBUTION

    Interiors  Systems products are sold primarily in markets related to the new
construction and renovation of commercial buildings as well as the retail market
for small commercial contractors. Marketing and distribution to large commercial
users  is  conducted  through  a   network  of  distributors  and   installation
contractors  as  well as  through L&W  Supply and  is oriented  toward providing
integrated  interior  systems  at  competitive  price  levels.  The  Corporation
emphasizes  educational and promotional materials designed to influence decision
makers who  play a  significant role  in choosing  material suppliers,  such  as
interior  designers,  contractors  and  facility  managers.  To  this  end,  USG
Interiors maintains  the "Solutions  Center"-SM- located  adjacent to  Chicago's
Merchandise  Mart which  is used for  product displays,  educational seminars on
products  and  new  product  design  and  development.  In  recent  years,   the
Corporation  has increased its emphasis on the retail market and as a result now
sells its products to  seven of the ten  largest building products retailers  in
the United States.

COMPETITION

    The  Corporation estimates  that it is  the world's  largest manufacturer of
ceiling suspension systems  with approximately  40% of worldwide  sales of  such
products.  USG's most  significant competitor  is Chicago  Metallic Corporation,
which participates  in  the U.S.  and  European markets.  Other  competitors  in
ceiling  grid include W.A.V.E.  (a joint venture  of Armstrong World Industries,
Inc. and National Rolling Mills). The Corporation estimates that it accounts for
approximately one-third of sales of acoustical ceiling tile to the U.S.  market.
Principal  global  competitors  include Armstrong  World  Industries,  Inc. (the
largest manufacturer), Odenwald of West Germany and the Celotex Corporation.

BUILDING PRODUCTS DISTRIBUTION

BUSINESS

    The Building Products Distribution segment consists of the operations of the
Corporation's L&W Supply subsidiary.  L&W Supply is  the largest distributor  of
wallboard  and  related building  products  for residential  and non-residential
construction in the United  States. L&W Supply  distributes approximately 9%  of
all the wallboard sold in the U.S. (including approximately 23% of U.S. Gypsum's
wallboard  production). Wallboard accounts for approximately 46% of L&W Supply's
total sales.

    Although L&W Supply specializes in distribution of wallboard, joint compound
and other products manufactured  primarily by U.S.  Gypsum, it also  distributes
USG  Interiors' products  such as acoustical  ceiling tile and  ceiling grid and
products of  other  manufacturers,  including  construction  metal,  insulation,
roofing products and accessories.

                                       43
<PAGE>
    L&W  Supply was founded  in 1971 by  U.S. Gypsum to  address what management
perceived as a  growing demand in  the construction industry  for a  specialized
delivery  service for construction materials,  especially gypsum wallboard. U.S.
Gypsum management  believed  the  construction industry  could  benefit  from  a
service-oriented  organization which would not  only deliver less than truckload
quantities of construction materials to a  job site, but which also would  place
them in the areas where the work was being done, thereby reducing or eliminating
the  need  for handling  by contractors.  To perform  this service,  U.S. Gypsum
established a  number  of distribution  centers  that could  stock  construction
materials  and be  able to deliver  relatively large quantities  with short lead
times.

    L&W Supply has grown significantly  over the past 22  years and now has  130
distribution centers located in 33 states.

FINANCIAL PERFORMANCE

    Summary financial results for the Building Products Distribution segment are
outlined  in the  table below.  Such results  are not  adjusted for intersegment
sales eliminations and corporate expenses.

<TABLE>
<CAPTION>
                                 1992      1991     1990     1989     1988
                                -------   ------   ------   ------   ------
                                           (DOLLARS IN MILLIONS)
<S>                             <C>       <C>      <C>      <C>      <C>
Net sales.....................     $464     $424     $478     $485     $483
Operating profit..............        3        0        4        7       12
EBITDA........................        5        4       12       16       23
EBITDA margin.................      1.1%     0.9%     2.5%     3.3%     4.8%
Capital expenditures..........        3        1        1        1        3
</TABLE>

    See "Selected Consolidated  Financial Data." For  additional information  on
the  Corporation's  results by  industry  segment, including  intersegment sales
eliminations and  corporate  expenses, see  "Index  to Financial  Statements  --
Significant Accounting Policies and Practices."

DISTRIBUTION CENTERS

    L&W  Supply leases approximately  80% of its  facilities from third parties,
which management believes  provides it with  the flexibility to  enter and  exit
fluctuating  market areas. Usually,  initial leases are for  three to five years
with a five-year renewal option. Facilities are located in virtually every major
metropolitan area in the United States.

    A typical  L&W  Supply facility  has  approximately 12,000  square  feet  of
warehouse  space, 1,500 square feet of office  space and is located on 1.5 paved
acres of land  in prime industrial  areas with good  interstate highway  access.
Each  center is equipped with  at least one flatbed truck,  a boom truck and, in
some cases, a  towable forklift. Boom  trucks are standard  flatbed trucks  with
telescoping  hydraulic booms  installed on the  front of the  truckbed. By using
either the telescoping boom  or the towable forklift,  L&W Supply employees  are
able to place wallboard, joint compound and other materials in various locations
on a job site.

COMPETITION

    L&W Supply's closest competitor, Gypsum Management Supply, is an independent
distributor with approximately 70 locations in the southern, central and western
United  States. There are  several regional competitors,  such as Gypsum Drywall
Management Association in the southern United States and Strober Building Supply
in the northeastern United States.  L&W Supply's many local competitors  include
lumber  dealers, hardware stores, mass  merchandisers, home improvement centers,
acoustical tile distributors and manufacturers.

    Sales are seasonal to the extent  that sales are generally greater from  the
middle  of spring through the middle of autumn than during the remaining part of
the year.

                                       44
<PAGE>
PROPERTIES OF THE CORPORATION

    The  Corporation's  plants,  mines,  transport  ships,  quarries  and  other
facilities  are located  in North  America, Europe,  Australia, New  Zealand and
Malaysia. Many of these facilities are  operating at or near full capacity.  All
facilities  and equipment are  in good operating  condition and, in management's
judgment, sufficient expenditures have been made annually to maintain them.  The
locations  of  the  production  properties  of  the  Corporation's subsidiaries,
grouped by industry segment, are as  follows (plants are owned unless  otherwise
indicated):

GYPSUM PRODUCTS

    Gypsum Board and Other Gypsum Products

<TABLE>
<CAPTION>
                  UNITED STATES
           ---------------------------
<C>        <S>
  (*)(**)  Baltimore, Maryland
        *  Boston (Charlestown),
           Massachusetts
  (*)(**)  Detroit (River Rouge),
           Michigan
  (*)(**)  East Chicago, Indiana
           Empire (Gerlach), Nevada
           Fort Dodge, Iowa
        *  Fremont, California
       **  Galena Park, Texas
        *  Gypsum, Ohio
        *  Jacksonville, Florida
  (*)(**)  New Orleans, Louisiana
        *  Norfolk, Virginia
           Oakfield, New York
           Plaster City, California
           Plasterco (Saltville),
           Virginia
        *  Santa Fe Springs,
           California
           Shoals, Indiana
           Sigurd, Utah
           Southard, Oklahoma
           Sperry, Iowa
        *  Stony Point, New York
           Sweetwater, Texas
           CANADA
           ---------------------------
           Hagersville, Ontario
        *  Montreal, Quebec
        *  St. Jerome, Quebec
           MEXICO
           ---------------------------
      ***  Puebla, Puebla
</TABLE>

    Gypsum  plants utilize locally mined or quarried gypsum rock unless noted as
follows:

      * These plants use  rock from  quarry operations  at Alabaster,  Michigan;
        Empire, Nevada; Plaster City, California; Little Narrows and/or Windsor,
        Nova Scotia; or Harbour Head, Jamaica, an outside source.

     ** These plants purchase synthetic gypsum from outside sources.

    *** This plant purchases all rock from outside sources.

    Joint Compound

    Surface  preparation  and joint  treatment products  are produced  in plants
located at Chamblee, Georgia; Dallas, Texas; East Chicago, Indiana; Fort  Dodge,
Iowa;  Gypsum, Ohio; Jacksonville,  Florida; Port Reading,  New Jersey (leased);
Sigurd, Utah; Tacoma,  Washington; Torrance,  California; Hagersville,  Ontario,
Canada;  Montreal,  Quebec,  Canada;  Puebla,  Mexico;  and  Selangor,  Malaysia
(leased).

    Paper

    Paper for gypsum board  is manufactured at Clark,  New Jersey; Galena  Park,
Texas;  Gypsum,  Ohio;  Jacksonville,  Florida;  North  Kansas  City,  Missouri;
Oakfield, New York; and South Gate, California.

    Ocean Vessels

    Gypsum Transportation Limited, a wholly owned subsidiary of the Corporation,
headquartered in  Bermuda, owns  and operates  a fleet  of three  self-unloading
ocean  vessels. Under contract of affreightment,  these vessels haul gypsum rock
from Nova Scotia to the East Coast  and Gulf port plants of U.S. Gypsum.  Excess
ship time, when available, is offered for charter on the open market.

                                       45
<PAGE>
    Miscellaneous

    A  mica-processing plant is located at  Spruce Pine, North Carolina. Perlite
ore is produced at Grants, New Mexico. These minerals are used in the production
of joint compound  and gypsum  products, respectively. Metal  lath, plaster  and
drywall  accessories and light gauge steel  framing products are manufactured at
Puebla, Mexico. Metal  safety grating products  are manufactured at  Burlington,
Ontario,  Canada (leased); and Delta, British Columbia, Canada (leased). Various
other building products  are manufactured at  La Mirada, California  (adhesives)
and New Orleans, Louisiana (lime products).

INTERIOR SYSTEMS

    Ceiling Tile

    Acoustical  ceiling tile and panels  are manufactured at Cloquet, Minnesota;
Greenville, Mississippi; Gypsum, Ohio; Walworth, Wisconsin; San Juan Ixhautepec,
Mexico; and Aubange, Belgium.

    Ceiling Grid

    Ceiling grid products are  manufactured at Cartersville, Georgia;  Stockton,
California;  Westlake,  Ohio;  Auckland, New  Zealand  (leased);  Dreux, France;
Oakville,  Ontario,  Canada;  Peterlee,  England  (leased);  Selangor,  Malaysia
(leased);  and Viersen,  Germany. A  coil coater and  slitter plant  used in the
production of ceiling grid is also located in Westlake, Ohio.

    Access Floor Systems

    Access floor systems  products are manufactured  at Red Lion,  Pennsylvania;
Dreux,  France; Oakville, Ontario, Canada; Peterlee, England (leased); Selangor,
Malaysia (leased); and Viersen, Germany.

    Mineral Wool

    Mineral wool products  are manufactured  at Birmingham,  Alabama; Red  Wing,
Minnesota; Tacoma, Washington; Wabash, Indiana; Walworth, Wisconsin; and Weston,
Ontario, Canada.

    Wall Systems

    Wall system products are manufactured at Medina, Ohio (leased).

    Commercial Interior Systems

    Commercial interior systems are manufactured at Westlake, Ohio.

GENERAL INFORMATION

ASBESTOS LITIGATION

    One  of  the  Corporation's  subsidiaries, U.S.  Gypsum,  is  among numerous
defendants  in   lawsuits  arising   out  of   the  manufacture   and  sale   of
asbestos-containing    building    materials.   U.S.    Gypsum    sold   certain
asbestos-containing products beginning in the 1930's; in most cases the products
were discontinued or asbestos was removed from the product formula by 1972,  and
no  asbestos-containing products  were sold after  1977. Some  of these lawsuits
seek to  recover compensatory  and  in many  cases  punitive damages  for  costs
associated  with maintenance or  removal and replacement  of products containing
asbestos (the "Property  Damage Cases").  Others of these  suits (the  "Personal
Injury  Cases") seek to recover compensatory  and in many cases punitive damages
for  personal  injury  allegedly  resulting   from  exposure  to  asbestos   and
asbestos-containing  products. It is anticipated that additional personal injury
and property damage cases containing similar allegations will be filed.

    As discussed below, U.S. Gypsum has substantial personal injury and property
damage insurance for  the years involved  in the asbestos  litigation. Prior  to
1985,  when  an asbestos  exclusion was  added to  U.S. Gypsum's  policies, U.S.
Gypsum purchased  comprehensive general  liability insurance  policies  covering
personal injury and property damage in an aggregate face amount of approximately
$850

                                       46
<PAGE>
million.  Insurers that issued approximately $100  million of these policies are
presently  insolvent.  Because  U.S.   Gypsum's  insurance  carriers   initially
responded  to its claims  for defense and  indemnification with various theories
denying or  limiting coverage  and  the applicability  of their  policies,  U.S.
Gypsum  filed a declaratory judgment action against them in the Circuit Court of
Cook County,  Illinois  on  December  29, 1983.  (U.S.  GYPSUM  CO.  V.  ADMIRAL
INSURANCE  CO.,  ET AL.)  (the "Coverage  Action"). U.S.  Gypsum alleges  in the
Coverage Action that the carriers  are obligated to provide indemnification  for
settlements  and judgments  and, in some  cases, defense costs  incurred by U.S.
Gypsum in personal injury and property damage cases in which it is a  defendant.
The  current defendants are  ten insurance carriers  that provided comprehensive
general liability insurance coverage to U.S. Gypsum between the 1940's and 1984.
As discussed below, several carriers have settled all or a portion of the claims
in the Coverage Action.

    U.S. Gypsum's  aggregate  expenditures  for  all  asbestos-related  matters,
including  property damage,  personal injury, insurance  coverage litigation and
related expenses,  exceeded aggregate  insurance payments  by $15.4  million  in
1990, $10.9 million in 1991 and $25.8 million in 1992.

    Property Damage Cases

    The Property Damage Cases have been brought against U.S. Gypsum by a variety
of plaintiffs, including school districts, state and local governments, colleges
and  universities, hospitals, and private property owners. U.S. Gypsum is one of
many defendants in  four cases  that have been  certified as  class actions  and
others  that request  such certification.  One class  action suit  is brought on
behalf of owners and  operators of all elementary  and secondary schools in  the
United  States that  contain or contained  friable asbestos-containing material.
(IN RE  ASBESTOS  SCHOOL  LITIGATION, U.S.D.C.,  E.D.Pa.).  Approximately  1,350
school  districts opted out of  the class, some of which  have filed or may file
separate lawsuits or are  participants in a state  court class action  involving
approximately  333 school districts in Michigan. (BOARD OF EDUCATION OF THE CITY
OF DETROIT, ET  AL. V. THE  CELOTEX CORP., ET  AL., Cir. Ct.  for Wayne  County,
Mich.).  On April  10, 1992,  a state  court in  Philadelphia certified  a class
consisting of all owners of buildings leased to the federal government.  (PRINCE
GEORGE  CENTER,  INC.  V.  U.S.  GYPSUM  CO.,  ET  AL.,  Ct.  of  Common  Pleas,
Philadelphia, Pa.)  On September  4, 1992,  a Federal  district court  in  South
Carolina   conditionally  certified  a  class  comprised  of  all  colleges  and
universities in the United States,  which certification is presently limited  to
the resolution of certain allegedly "common" liability issues. (CENTRAL WESLEYAN
COLLEGE,  V. W.R. GRACE & CO., ET AL.,  U.S.D.C., S.C.). On December 23, 1992, a
case was filed in state court in  South Carolina purporting to be a  "voluntary"
class  action on behalf of  owners of all buildings  containing certain types of
asbestos-containing  products  manufactured  by   the  nine  named   defendants,
including  U.S.  Gypsum, other  than  buildings owned  by  the federal  or state
governments, single family residences, or buildings  at issue in the four  above
described  class actions (ANDERSON COUNTY HOSPITAL V.  W.R. GRACE & CO., ET AL.,
Court of Common Pleas, Hampton Co.,  S.C. (the "Anderson Case"). On January  14,
1993,  the  plaintiff  filed  an  amended  complaint  that  added  a  number  of
defendants, including  the Corporation.  The  amended complaint  alleges,  among
other things, that the guarantees executed by U.S. Gypsum in connection with the
1988  Recapitalization, as  well as subsequent  distributions of  cash from U.S.
Gypsum to  the Corporation,  rendered  U.S. Gypsum  insolvent and  constitute  a
fraudulent  conveyance. The suit  seeks to set aside  the guarantees and recover
the value of the cash flow "diverted" from U.S. Gypsum to the Corporation in  an
amount  to be determined. This case has not been certified as a class action and
no other  threshold issues,  including whether  the South  Carolina Courts  have
personal  jurisdiction  over the  Corporation,  have been  decided.  The damages
claimed against U.S.  Gypsum in  the class  action cases  are unspecified.  U.S.
Gypsum  has denied  the substantive allegations  of each of  the Property Damage
Cases and intends to defend them vigorously except when advantageous settlements
are possible.

    As of September 30, 1993, 85 Property Damage Cases were pending against U.S.
Gypsum; however, the number of buildings involved is greater than the number  of
cases  because  many of  these cases,  including the  class actions  referred to
above, involve multiple buildings. Approximately 42 property damage claims  have
been threatened against U.S. Gypsum.

                                       47
<PAGE>
    In  total, U.S. Gypsum  has settled property  damage claims of approximately
189 plaintiffs involved in approximately 74 cases. All settlements were paid out
of reserves. Twenty-four cases have been tried to verdict, 15 of which were  won
by  U.S. Gypsum and 7 lost; two other cases,  one won at the trial level and one
lost, were settled  after appeals.  Another case that  was lost  at trial  court
level  has been reversed on appeal and  a new trial ordered. Appeals are pending
in 4 of the tried cases. In  the cases lost, compensatory damage awards  against
U.S.  Gypsum have totaled $11.5 million.  Punitive damages totaling $5.5 million
were entered against  U.S. Gypsum  in four trials.  Two of  the punitive  damage
awards,  totaling $1.45 million, were paid after appeals were exhausted; a third
was settled after  the verdict was  reversed on appeal.  The remaining  punitive
award is on appeal.

    In  1990, 24 new  Property Damage Cases  were filed against  U.S. Gypsum, 21
were dismissed before trial, 14 were  settled, 4 were closed following trial  or
appeal,  and 124 were  pending at year  end; $14.6 million  was expended for the
defense and resolution of Property Damage  Cases and insurance payments of  $4.2
million  were received in 1990.  During 1991, 14 new  Property Damage Cases were
filed against U.S. Gypsum, 7 were dismissed before trial, 8 were settled, 2 were
closed following trial or appeal, and 121 were pending at year end; U.S.  Gypsum
expended  $22.2 million for the defense  and resolution of Property Damage Cases
and received  insurance  payments of  $13.8  million in  1991.  In 1992,  7  new
Property  Damage Cases were  filed against U.S. Gypsum,  9 were dismissed before
trial, 17 were settled,  2 were closed  following trial or  appeal, and 97  were
pending  at year end.  U.S. Gypsum expended approximately  $34.9 million for the
defense and resolution of Property Damage Cases and received insurance  payments
of $10.2 million in 1992.

    In  the Property Damage Cases litigated to date, a defendant's liability for
compensatory damages, if any,  has been limited to  damages associated with  the
presence  and  quantity  of asbestos-containing  products  manufactured  by that
defendant which are identified in the buildings at issue, although plaintiffs in
some cases have  argued that principles  of joint and  several liability  should
apply.  Because of the  unique factors inherent  in each of  the Property Damage
Cases, including the lack of  reliable information as to product  identification
and  the amount of damages claimed against  U.S. Gypsum in many cases, including
the class actions  described above, management  is unable to  make a  reasonable
estimate of the cost of disposing of pending Property Damage Cases.

    Personal Injury Cases

    U.S.  Gypsum was among numerous defendants in asbestos personal injury suits
and administrative claims involving 60,741 claimants pending as of September 30,
1993. All asbestos bodily injury claims pending in the federal courts, including
approximately one-third  of  the  Personal Injury  Cases  pending  against  U.S.
Gypsum,  have  been consolidated  in the  United States  District Court  for the
Eastern District of Pennsylvania.

    U.S. Gypsum  is  a  member,  together with  19  other  former  producers  of
asbestos-containing   products,  of  the  Center   for  Claims  Resolution  (the
"Center"). The  Center  has assumed  the  handling, including  the  defense  and
settlement,  of all  Personal Injury Cases  pending against U.S.  Gypsum and the
other members of the Center. Each member of the Center is assessed a portion  of
the  liability and  defense costs  of the Center  for the  Personal Injury Cases
handled by the Center, according  to predetermined allocation formulas. Five  of
U.S.  Gypsum's insurance  carriers that in  1985 signed  an Agreement Concerning
Asbestos-Related Claims  (the "Wellington  Agreement") are  supporting  insurers
(the "Supporting Insurers") of the Center. The Supporting Insurers are obligated
to  provide coverage for the defense and indemnity costs of the Center's members
pursuant to  the coverage  provisions in  the Wellington  Agreement. Claims  for
punitive  damages are defended but  not paid by the  Center; if punitive damages
are  recovered,  insurance  coverage  may  be  available  under  the  Wellington
Agreement  depending on  the terms of  particular policies  and applicable state
law. Punitive damages have not  been awarded against U.S.  Gypsum in any of  the
Personal  Injury Cases. Virtually all of U.S. Gypsum's personal injury liability
and defense  costs  are  paid  by  those of  its  insurance  carriers  that  are
Supporting Insurers. The Supporting Insurers provided approximately $350 million
of the total coverage referred to above.

                                       48
<PAGE>
    On  January 15, 1993, U.S.  Gypsum and the other  members of the Center were
named as defendants in a class action  filed in the U.S. District Court for  the
Eastern  District Pennsylvania (CARLOUGH ET AL. V. AMCHEM PRODUCTS INC., ET AL.,
Case No. 93-CV-0215). The complaint generally defines the class of plaintiffs as
all persons who have been occupationally exposed to asbestos-containing products
manufactured by the defendants,  who had not filed  an asbestos personal  injury
suit  as of the date of the filing  of the class action. Simultaneously with the
filing of the class  action, the parties filed  a settlement agreement in  which
the  named  plaintiffs, proposed  class counsel,  and  the defendants  agreed to
settle and  compromise the  claims of  the proposed  class. The  settlement,  if
approved  by the  court, will  implement for  all future  Personal Injury Cases,
except as noted below, an administrative compensation system to replace judicial
claims against the defendants, and  will provide fair and adequate  compensation
to future claimants who can demonstrate exposure to asbestos-containing products
manufactured  by the defendants and the presence of an asbestos-related disease.
Class members  will be  given  the opportunity  to "opt  out,"  or elect  to  be
excluded  from  the settlement,  although the  defendants  reserve the  right to
withdraw from  the settlement  if  the number  of opt  outs  is, in  their  sole
judgment,  excessive. In  addition, in each  year a limited  number of claimants
will have certain  rights to prosecute  their claims for  compensatory (but  not
punitive)  damages in court in the event they reject compensation offered by the
administrative processing of their claim.

    The Center  members,  including  U.S. Gypsum,  have  instituted  proceedings
against  those of their insurance carriers that had not consented to support the
settlement, seeking a  declaratory judgment  that the  settlement is  reasonable
and,  therefore, that the  carriers are obligated  to fund their  portion of it.
Consummation of the  settlement is  contingent upon, among  other things,  court
approval  of the settlement  and a favorable ruling  in the declaratory judgment
proceedings against the non-consenting insurers. It is anticipated that  appeals
will  follow the district  court's ruling on the  fairness and reasonableness of
the settlement.

    Each of  the defendants  has committed  to  fund a  defined portion  of  the
settlement,  up to a stated maximum amount,  over the initial ten-year period of
the  agreement  (which  is  automatically  extended  unless  terminated  by  the
defendants).  Taking  into account  the provisions  of the  settlement agreement
concerning the number  of claims that  must be  processed in each  year and  the
total  amount that must be made available to the claimants, the Center estimates
that U.S.  Gypsum will  be obligated  to fund  a maximum  of approximately  $125
million  of the class  action settlement, exclusive of  expenses, with a maximum
payment of less than $18 million in any single year; of the total amount of U.S.
Gypsum's obligation, all but approximately $13 million or less is expected to be
paid by U.S. Gypsum's insurance carriers.

    During 1990, 11,095 new Personal Injury Cases were filed against U.S. Gypsum
and 7,272 were  settled or  dismissed. U.S.  Gypsum incurred  expenses of  $14.2
million  in 1990 with respect  to Personal Injury Cases,  $13.9 million of which
was paid directly by insurance. During  1991, 13,077 Personal Injury Cases  were
filed  against  U.S. Gypsum  and 6,273  were settled  or dismissed.  U.S. Gypsum
incurred expenses  of $15.1  million in  1991 with  respect to  Personal  Injury
Cases,  of  which  $15.0 million  was  paid  by insurance.  During  1992, 20,117
Personal Injury Cases were filed against U.S. Gypsum and 10,631 were settled  or
dismissed.  U.S. Gypsum incurred expenses of  $21.6 million in 1992 with respect
to Personal Injury Cases  of which $21.5  million was paid  by insurance. As  of
December  31, 1992,  1991 and  1990, 54,188,  42,652 and  36,967 Personal Injury
Cases were outstanding against U.S. Gypsum, respectively.

    U.S. Gypsum's average  settlement cost  for Personal Injury  Cases over  the
past  three years has been approximately  $1,350 per claim, exclusive of defense
costs. Management  anticipates that  its average  settlement cost  is likely  to
increase  due  to  such factors  as  the possible  insolvency  of co-defendants,
although this increase may be offset to some extent by other factors,  including
the possibility for block settlements of large numbers of cases and the apparent
increase in the percentage of asbestos personal injury cases that appear to have
been   brought  by  individuals  with  little  or  no  physical  impairment.  In
management's opinion,  based  primarily upon  U.S.  Gypsum's experience  in  the
Personal Injury Cases disposed of to date and taking into consideration a number
of uncertainties, it is probable

                                       49
<PAGE>
that  asbestos-related Personal Injury  Cases pending against  U.S. Gypsum as of
December 31, 1992, can be disposed of for an amount estimated to be between  $80
million  and $100  million, including  both indemnity  costs and  legal fees and
expenses. The estimated  cost of  resolving pending claims  takes into  account,
among  other factors, (i) an increase in  the number of pending claims; (ii) the
settlements of certain large blocks of claims for higher per-case averages  than
have  historically  been paid;  and  (iii) a  slight  increase in  U.S. Gypsum's
historical settlement  average. No  accrual has  been recorded  for this  amount
because, pursuant to the Wellington Agreement, U.S. Gypsum's Supporting Insurers
are obligated to pay these costs.

    Assuming  that the  CARLOUGH class  action settlement  referred to  above is
approved substantially  in  its current  form,  management estimates,  based  on
assumptions  supplied by  the Center,  U.S. Gypsum's  maximum total  exposure in
Personal Injury  Cases  during the  next  ten years  (the  initial term  of  the
agreement),  including liability for pending claims,  claims resolved as part of
the class action settlement, and  opt out claims, as  well as defense costs  and
other expenses, at approximately $271 million, of which at least $254 million is
expected  to be  paid by  insurance. Management is  unable to  make a reasonable
estimate of the cost of disposing of Personal Injury cases that will be filed in
the future in the event that the CARLOUGH settlement is not implemented  because
of the inability to predict the number of such filings.

    Coverage Action

    As  indicated above, all of U.S. Gypsum's carriers initially denied coverage
for the Property  Damage Cases and  the Personal Injury  Cases, and U.S.  Gypsum
initiated  the Coverage  Action to  establish its  right to  such coverage. U.S.
Gypsum has voluntarily dismissed the Supporting Insurers referred to above  from
the personal injury portion of the Coverage Action because they are committed to
providing  personal injury coverage in accordance with the Wellington Agreement.
U.S. Gypsum's  claims  against  the  remaining carriers  for  coverage  for  the
Personal Injury Cases have been stayed since 1984.

    On  January 7,  1991, the trial  court in  the Coverage Action  ruled on the
applicability of U.S. Gypsum's insurance policies to settlements and one adverse
judgment in eight Property  Damage Cases. The court  ruled that the eight  cases
were  generally covered, and  imposed coverage obligations  on particular policy
years based upon the dates when the presence of asbestos-containing material was
"first  discovered"  by  the   plaintiff  in  each   case.  The  court   awarded
reimbursement  of approximately $6.2 million spent by U.S. Gypsum to resolve the
eight cases. U.S.  Gypsum has appealed  the court's ruling  with respect to  the
policy  years  available  to  cover particular  claims,  and  the  carriers have
appealed most other aspects of the  court's ruling. The appeal process may  take
up to a year or more from the date of this Prospectus.

    U.S.  Gypsum's experience in the Property  Damage Cases suggests that "first
discovery" dates in the  eight cases referred to  above (1978 through 1985)  are
likely  to  be typical  of  most pending  cases.  U.S. Gypsum's  total insurance
coverage for  the years  1978  through 1984  totals approximately  $350  million
(after  subtracting  insolvencies  and discounts  given  to  settling carriers).
However, some pending cases, as well as  some cases filed in the future, may  be
found  to have first discovery dates later than August 1, 1984, after which U.S.
Gypsum's insurance  policies  did  not  provide  coverage  for  asbestos-related
claims.  In addition, as described below, the first layer excess carrier for the
years 1980 through  1984 is insolvent  and U.S.  Gypsum may be  required to  pay
amounts otherwise covered by those and other insolvent policies. Accordingly, if
the  court's ruling is affirmed,  U.S. Gypsum will likely  be required to bear a
portion of the cost of the property damage litigation.

    Eight carriers, including two of the Supporting Insurers, have settled  U.S.
Gypsum's  claims for both property damage  and personal injury coverage and have
been dismissed from the  Coverage Action entirely. Four  of these carriers  have
agreed to pay all or a substantial portion of their policy limits to U.S. Gypsum
beginning  in 1991 and continuing  over the next four  years. Three other excess
carriers, including the two settling Supporting Insurers, have agreed to provide
coverage for the Property Damage Cases and the Personal Injury Cases subject  to
certain  limitations and conditions,  when and if  underlying primary and excess
coverage is  exhausted. It  cannot presently  be determined  when such  coverage
might   be  reached.  Taking  into  account  the  above  settlements,  including
participation of certain

                                       50
<PAGE>
of the settling carriers  in the Wellington  Agreement, and consumption  through
December  31, 1992, carriers  providing a total of  approximately $97 million of
unexhausted  insurance  have  agreed,  subject  to  the  terms  of  the  various
settlement  agreements, to cover both Personal  Injury Cases and Property Damage
Cases. Carriers  providing  an additional  $276  million of  coverage  that  was
unexhausted  as of December 31, 1992 have  agreed to cover Personal Injury Cases
under the Wellington Agreement,  but continue to  contest coverage for  Property
Damage  Cases and  remain defendants  in the  Coverage Action.  U.S. Gypsum will
continue to seek negotiated resolutions with  its carriers in order to  minimize
the expense and delays of litigation.

    Insolvency  proceedings have been  instituted against four  of U.S. Gypsum's
insurance carriers.  Midland  Insurance  Company, declared  insolvent  in  1986,
provided  excess insurance ($4  million excess of $1  million excess of $500,000
primary in  each policy  year) from  February  15, 1975  to February  15,  1978;
Transit  Casualty Company, declared insolvent in 1985, provided excess insurance
($15 million excess of $1  million primary in each  policy year) from August  1,
1980  to December 31,  1985; Integrity Insurance  Company, declared insolvent in
1986, provided excess insurance ($10 million  quota share of $25 million  excess
of  $90  million) from  August 1,  1983 to  July 31,  1984; and  American Mutual
Insurance Company, declared  insolvent in  1989, provided the  primary layer  of
insurance  ($500,000 per year)  from February 1,  1963 to April  15, 1971. It is
possible that U.S.  Gypsum will be  required to pay  a presently  indeterminable
portion of the costs that would otherwise have been covered by these policies.

    It  is not  possible to predict  the number of  additional lawsuits alleging
asbestos-related claims that  may be filed  against U.S. Gypsum.  The number  of
Personal  Injury Claims pending against U.S. Gypsum has increased in each of the
last several years.  In addition,  many Property Damage  Cases are  still at  an
early  stage and the potential liability therefrom is consequently uncertain. In
view of  the limited  insurance  funding currently  available for  the  Property
Damage  Cases  resulting  from the  continued  resistance  by a  number  of U.S.
Gypsum's insurers to providing coverage,  the effect of the asbestos  litigation
on  the Corporation will depend upon a variety of factors, including the damages
sought in the Property Damage Cases that reach trial prior to the completion  of
the Coverage Action, U.S. Gypsum's ability to successfully defend or settle such
cases,  and the resolution  of the Coverage  Action. As a  result, management is
unable to determine whether an adverse  outcome in the asbestos litigation  will
have  a material adverse effect on the results of operations or the consolidated
financial position of the Corporation.

    Accounting Change

    Effective January 1, 1994,  the Corporation will  adopt the requirements  of
FASB  Interpretation  No. 39.  In accordance  with  Interpretation No.  39, U.S.
Gypsum will record an accrual  for its liabilities for asbestos-related  matters
which  are deemed probable and can  be reasonably estimated, and will separately
record an asset equal to the amount  of such liabilities that is expected to  be
paid  by  uncontested insurance.  Due  to management's  inability  to reasonably
estimate U.S.  Gypsum's  liability for  Property  Damage Cases  and  (until  the
implementation  of CARLOUGH is deemed probable) future Personal Injury Cases, it
is presently anticipated that the liabilities and assets to be recorded in  1994
will  relate  only  to pending  Personal  Injury Cases.  This  implementation of
Interpretation No. 39  is not  expected to have  a material  impact on  reported
earnings or net assets.

ENVIRONMENTAL LITIGATION

    The  Corporation and certain of its subsidiaries have been notified by state
and federal environmental protection agencies of possible involvement as one  of
numerous  "potentially responsible parties" in a number of so-called "Superfund"
sites in the United States.  The Corporation believes that appropriate  reserves
have  been  established  for  its potential  liability  in  connection  with all
Superfund  sites  but  is  continuing  to  review  its  accruals  as  additional
information  becomes  available.  The Corporation  believes  that  neither these
matters nor  any other  known  governmental proceeding  regarding  environmental
matters  will have a  material adverse effect upon  its earnings or consolidated
financial position.

                                       51
<PAGE>
OTHER

    The Corporation's plants are substantial users of thermal energy. Five major
fuel types are used in a mix consisting of 81% natural gas, 10% electricity,  3%
coke,  3% coal and 3% oil. With few exceptions, plants which use natural gas are
equipped with fuel stand-by systems, principally oil. Primary fuel supplies have
been  adequate  and  no  curtailment  of  plant  operations  has  resulted  from
insufficient  supplies. Supplies are  likely to remain  sufficient for projected
requirements.

    Loss of one or more of the patents or licenses held by the Corporation would
not have a major impact on the Corporation's business or its ability to continue
operations.

    None of the industry segments has any special working capital requirements.

    None of the industry segments is  materially dependent on a single  customer
or  a few customers  on a regular  basis. No single  customer of the Corporation
accounted for more than  4% of the Corporation's  1992 or 1991 consolidated  net
sales.

    Because  of the nature of the  manufacturing processes, none of the industry
segments has any significant backlog; rather, they fill orders upon receipt.

    No  material  part  of  any  industry  segment's  business  is  subject   to
renegotiation  of profits  or termination  of contracts  or subcontracts  at the
election of the government.

    All of the  Corporation's products regularly  require improvement to  remain
competitive.  The Corporation  also develops and  produces comprehensive systems
employing several of its products. In  order to maintain its high standards  and
remain  a  leader  in  the  building  materials  industry,  the  Corporation has
performed extensive research and development activities and makes the  necessary
capital  expenditures to maintain production  facilities in sufficient operating
condition.

    The average number of  persons employed by the  Corporation during 1992  and
1991 was 11,850 and 11,800, respectively.

                                   MANAGEMENT

DIRECTORS OF THE CORPORATION

    In  connection with the consummation of  the Prepackaged Plan, the number of
persons comprising the Board was increased by five effective May 6, 1993  which,
after  the  May  1993  retirement  of  one  director,  brought  the  total Board
membership to 15.  Another director  retired in  August 1993  and that  position
remains  vacant. Of the  five new directors (the  "New Directors"), two, Messrs.
Crutcher and Lesser, were nominated by  a committee representing holders of  the
Corporation's  senior subordinated  debentures which were  converted into Common
Stock under the Prepackaged Plan  (each a "Senior Subordinated Director");  two,
Messrs.  Fetzer and Zubrow, were nominated by Water Street (each a "Water Street
Director"); and  one,  Mr. Brown,  was  nominated by  a  committee  representing
holders of the Corporation's junior subordinated debentures which were converted
into   Common  Stock  and  warrants  under   the  Prepackaged  Plan  (a  "Junior
Subordinated Director").

    As the  respective  terms  of  office  of  the  New  Directors  expire,  the
Prepackaged  Plan provides that each such New Director will be renominated. If a
New Director declines or is unable to accept such nomination, or in the event  a
New Director resigns during his term or otherwise becomes unable to continue his
duties  as a  director, such  New Director  or, in  the case  of a  Water Street
Director, Water  Street,  shall recommend  his  successor to  the  Committee  on
Directors  of  the Board.  In the  event of  the  death or  incapacity of  a New
Director, his successor  shall be  recommended, in the  case of  a Water  Street
Director, by Water Street, in the case of a Senior Subordinated Director, by the
remaining Senior Subordinated Director, and in the case of a Junior Subordinated
Director,  by the remaining New Directors. Any  such nominee shall be subject to
approval by the  Board's Committee on  Directors and the  Board, which  approval
shall not be unreasonably withheld.

                                       52
<PAGE>
    Until June 22, 1997, the time at which the director nomination and selection
procedures  established  by the  Prepackaged Plan  terminate,  no more  than two
employee directors may serve simultaneously on the Board. An "employee director"
is defined for this purpose as any officer or employee of the Corporation or any
direct or indirect subsidiary, or any director of any such subsidiary who is not
also a director of the Corporation.

<TABLE>
<CAPTION>
                                                                                                      YEAR FIRST
                                                       PRINCIPAL OCCUPATION,                            BECAME
                                                   FIVE YEAR EMPLOYMENT HISTORY                        DIRECTOR
         NAME AND AGE                                 AND OTHER DIRECTORSHIPS                          AND CLASS
- ------------------------------  -------------------------------------------------------------------  -------------
<S>                             <C>                                                                  <C>
Eugene B. Connolly, 61          Chairman and Chief Executive Officer, since April 1993; Chairman of      1988
                                the Board  and  Chief  Executive Officer  (June  1990-March  1993);   Class 1994
                                President  and  Chief  Executive Officer  (January  1990-May 1990);
                                Executive  Vice  President  of  the  Corporation  (1987-1989);  and
                                President and Chief Executive Officer of USG Interiors, Inc. (March
                                1987-March 1989). He also was President and Chief Executive Officer
                                of  DAP Inc.  (July 1988-March 1989).  Prior to that,  he served as
                                President and  Chief  Operating  Officer of  United  States  Gypsum
                                Company.  He joined the Corporation  in 1958, was appointed General
                                Manager of the Southern Construction Products Division in 1980, and
                                was elected a Group Vice President, Subsidiaries in 1983 and  Group
                                Vice  President, International and Industrial in 1984. Mr. Connolly
                                is a director of BPB Industries plc, London, England, a director of
                                U.S. Can Corporation and is a  member of the Advisory Board of  the
                                Kellogg Graduate School of Management, Northwestern University, the
                                Dean's Advisory Council, School of Business, Indiana University and
                                the   Governing  Council,   Good  Shepherd   Hospital  (Barrington,
                                Illinois). Mr.  Connolly has  been a  director of  the  Corporation
                                since May 1988 and is Chairman of the Board's Executive Committee.
Keith A. Brown, 42              President (since 1987) of Chimera Corporation, a private management      1993
                                holding  company. Mr. Brown is a  director (since 1988) of Adelphia   Class 1994
                                Incorporated, a director  (since 1988) of  Global Film &  Packaging
                                Corporation,   a  director   (since  1989)   of  Mansfield  Foundry
                                Corporation, and  a  director  (since  1993)  of  Ashland  Castings
                                Corporation. Mr. Brown has been a director of the Corporation since
                                May  1993 and is a member of the Board's Audit Committee and Public
                                Affairs Committee.
James C. Cotting, 60            Chairman and Chief Executive Officer (since April 1987) of Navistar      1987
                                International Corporation.  Mr. Cotting  is  a director  of  Asarco   Class 1994
                                Incorporated and The Interlake Corporation. He is a director of the
                                National  Association  of  Manufacturers  and is  a  member  of the
                                Conference  Board.  Mr.  Cotting  has   been  a  director  of   the
                                Corporation  since  October  1987,  is  a  member  of  the  Board's
                                Executive Committee and is Chairman of its Finance Committee.
Philip C. Jackson, Jr., 65      Formerly Vice Chairman and a director of Central Bank of the South,      1979
                                Birmingham, Alabama, and of its parent company,                       Class 1994
</TABLE>

                                       53
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      YEAR FIRST
                                                       PRINCIPAL OCCUPATION,                            BECAME
                                                   FIVE YEAR EMPLOYMENT HISTORY                        DIRECTOR
         NAME AND AGE                                 AND OTHER DIRECTORSHIPS                          AND CLASS
- ------------------------------  -------------------------------------------------------------------  -------------
<S>                             <C>                                                                  <C>
                                Central Bancshares  of  the South  (1980-1989);  presently  Adjunct
                                Professor,  Birmingham-Southern College, Birmingham, Alabama (since
                                January 1989). From April 1990 to April 1993 he served as a  member
                                of  the Thrift  Depositors Protection  Oversight Board, Washington,
                                D.C. He is Director, Saul  Centers, Inc., Washington D.C. His  past
                                affiliations  include:  member of  the  Board of  Governors  of the
                                Federal Reserve System,  Washington, D.C.,  from July  1975 to  No-
                                vember  1978  and  Vice President  and  a director  of  the Jackson
                                Company (mortgage banking operations) of Birmingham, Alabama,  from
                                October    1949   to   June   1975.   Mr.   Jackson   is   Trustee,
                                Birmingham-Southern College,  Birmingham, Alabama.  He has  been  a
                                director  of the  Corporation since  May 1979,  is a  member of the
                                Board's Executive Committee and is  Chairman of its Public  Affairs
                                Committee.
John B. Schwemm, 59             Retired   Chairman   (1983-1989)   and   Chief   Executive  Officer      1988
                                (1983-1988) of  R.R.  Donnelley  & Sons  Company.  He  joined  that   Class 1994
                                Company  in 1965, prior to which he was with the law firm of Sidley
                                & Austin. Mr.  Schwemm was  appointed General Counsel  in 1969  and
                                elected  Group Vice President,  Book Group in 1976.  He serves as a
                                director of Walgreen  Company and  William Blair  Mutual Funds;  he
                                also  serves as a  Trustee of Northwestern  University. Mr. Schwemm
                                has been a  director of  the Corporation since  May 1988  and is  a
                                member  of  the Board's  Audit Committee  and Compensation  and Or-
                                ganization Committee.
W.H. Clark, 61                  Chairman of  the Board  (since 1984)  and Chief  Executive  Officer   1985 Class
                                (since 1982) and President (1984-1990) of Nalco Chemical Company of      1995
                                Naperville,  Illinois. He joined the company  in 1960 and served in
                                various capacities until  his appointment as  a General Manager  in
                                1978.  Mr. Clark  was elected  Group Vice  President and President,
                                Industrial Division (both in 1978); director in 1980; and Executive
                                Vice President, Domestic Operations, in  1982. He is a director  of
                                Northern  Trust  Corporation  and The  Northern  Trust  Bank, Nicor
                                Corporation, Bethlehem Steel  Corporation, James River  Corporation
                                and Northern Illinois Gas Company. Mr. Clark has been a director of
                                the  Corporation  since August  1985, is  a  member of  the Board's
                                Executive Committee and Compensation and Organization Committee and
                                is Chairman of its Committee on Directors and Audit Committee.
Lawrence M. Crutcher, 51        Managing Director  (since 1990)  of Veronis,  Suhler &  Associates,      1993
                                investment  bankers. From 1967 to 1989,  Mr. Crutcher was with Time   Class 1995
                                Inc. He was President  of Book-of-the-Month Club (1985-1989),  Vice
                                President  for Financial Planning (1984), Vice President, Magazines
                                (1981-1983),  and  Vice  President,  Circulation  (1976-1980).  Mr.
                                Crutcher has been
</TABLE>

                                       54
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      YEAR FIRST
                                                       PRINCIPAL OCCUPATION,                            BECAME
                                                   FIVE YEAR EMPLOYMENT HISTORY                        DIRECTOR
         NAME AND AGE                                 AND OTHER DIRECTORSHIPS                          AND CLASS
- ------------------------------  -------------------------------------------------------------------  -------------
<S>                             <C>                                                                  <C>
                                director  of the Corporation since May 1993  and is a member of the
                                Board's Committee on Directors and Public Affairs Committee.
Anthony J. Falvo, Jr., 63       Vice Chairman, since April  1993; President (June 1990-March  1993)      1988
                                and  Chief Operating  Officer (January  1990-March 1993); Executive   Class 1995
                                Vice President of the Corporation (1988-1989). He previously served
                                as President and  Chief Executive Officer  of United States  Gypsum
                                Company  (June 1988 to  March 1989), President  and Chief Executive
                                Officer  of  Masonite  Corporation  (April  1986-June  1988),   and
                                President  and  Chief  Operating  Officer  of  Masonite Corporation
                                (March 1985 -- April 1986). He  joined the Corporation in 1955  and
                                was  elected  Vice  President,  Marketing  (1982),  and  Group Vice
                                President,  Consumer  Products  (1984).  He  previously  served  as
                                President,  L&W Supply Corporation (1976) and Director, Group Staff
                                Services (1980). He serves as a  director of Urban Gateways and  is
                                on  the Development Council of  Good Shepherd Hospital (Barrington,
                                Illinois). Mr. Falvo has been  a director of the Corporation  since
                                May 1988 and is a member of the Board's Executive Committee.
Wade Fetzer III, 56             Partner  (since 1986) of Goldman,  Sachs & Co., investment bankers.      1993
                                Mr. Fetzer is a member of  the Board of Trustees and the  Executive   Class 1995
                                Committee of Rush-Presbyterian St. Luke's Medical Center, a Trustee
                                of   Northwestern  University  and   the  University  of  Wisconsin
                                Foundation, and  a  member of  the  Board of  United  Charities  of
                                Chicago.  Mr. Fetzer has  been a director  of the Corporation since
                                May  1993  and  is  a  member  of  the  Board's  Compensation   and
                                Organization  Committee, Public Affairs  Committee and Committee on
                                Directors.
Robert L. Barnett, 53           Formerly Vice Chairman  of Ameritech (1991-1992)  and President  of      1990
                                the   Ameritech  Bell  Group   (1989-1992),  which  includes  eight   Class 1996
                                wholly-owned  subsidiaries  of  American  Information  Technologies
                                Corporation  (Ameritech) and the Bell Group staff. Mr. Barnett also
                                served as  President  of Ameritech  Enterprise  Group  (1987-1989),
                                President  and Chief  Executive Officer  of Wisconsin  Bell Company
                                (1985-1987),  Vice  President  of  Operations  for  Wisconsin  Bell
                                Company  (1984-1985), President of  Ameritech Mobile Communications
                                Company (1983-1984), and in various other capacities with the  Bell
                                System,  which  he joined  in  1964. He  is  a director  of Johnson
                                Controls, Inc.  and is  a member  of the  Advisory Council  of  the
                                Robert  R. McCormick School  of Engineering and  Applied Science at
                                Northwestern  University   and  of   the  University's   Electrical
                                Engineering  and Computer Science Industrial  Advisory Board. He is
                                affiliated  with  the  Institute  of  Electrical  and   Electronics
                                Engineers. Mr. Barnett has been a
</TABLE>

                                       55
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      YEAR FIRST
                                                       PRINCIPAL OCCUPATION,                            BECAME
                                                   FIVE YEAR EMPLOYMENT HISTORY                        DIRECTOR
         NAME AND AGE                                 AND OTHER DIRECTORSHIPS                          AND CLASS
- ------------------------------  -------------------------------------------------------------------  -------------
<S>                             <C>                                                                   <C>
                                director  of the Corporation since May 1990  and is a member of the
                                Board's Compensation  and Organization  Committee, Audit  Committee
                                and Committee on Directors.
David W. Fox, 62                Chairman and Chief Executive Officer (since 1990) of Northern Trust      1987
                                Corporation  and The Northern  Trust Company. He  has been with The   Class 1996
                                Northern Trust  Company  since  1955  and  served  as  Senior  Vice
                                President  (1974-1978), Executive Vice  President (1978-1981), Vice
                                Chairman (1981-1987)  and  President  (1987-1993).  Mr.  Fox  is  a
                                director  of The Federal Reserve Bank of Chicago, Northern Trust of
                                Florida Corp., Banque Rivaud  (Paris, France), INROADS/Chicago  and
                                the Chicago Central Area Committee. He is a Governor of the Chicago
                                Stock Exchange and a trustee of Northwestern Memorial Hospital, the
                                Adler   Planetarium,   The  Orchestral   Association,   and  DePaul
                                University. Mr. Fox has  been a director  of the Corporation  since
                                May  1987, is a member of  the Board's Executive Committee, Finance
                                Committee and  Committee  on  Directors  and  is  Chairman  of  its
                                Compensation and Organization Committee.
Marvin E. Lesser, 52            Managing  Partner  (since  1989) of  Cilluffo  Associates,  L.P., a      1993
                                private investment partnership.  Managing Partner  (since 1993)  of   Class 1996
                                Sigma  Partners, L.P., a private investment partnership. Mr. Lesser
                                has also been a private consultant  since 1992. He was Senior  Vice
                                President (1986-1988) of Bessemer Securities Corporation, a private
                                investment   company   and   a  director   (1989-1991)   of  Amdura
                                Corporation. Mr.  Lesser has  been a  director of  the  Corporation
                                since  May 1993 and  is a member of  the Board's Finance Committee,
                                Committee on Directors and Public Affairs Committee.
Alan G. Turner, 60              Chairman  and  Chief  Executive  of  BPB  Industries  plc,  London,      1984
                                England,  a  manufacturer  of gypsum  products  and  other building   Class 1996
                                materials and  paper and  packaging  products. Prior  to  September
                                1993, Mr. Turner was Chairman (November 1992-August 1993), Chairman
                                and  Chief  Executive  (1985-1992),  Chief  Executive  (1978-1985),
                                Deputy Chief  Executive (1974-1978),  and served  in various  other
                                capacities  since his association with  BPB Industries plc in 1962.
                                He has been a  director of that company  since 1972. Mr. Turner  is
                                also  a  director and  Vice President  of  the National  Council of
                                Building Material Producers  Limited, United  Kingdom; director  of
                                The  Manufacturers  Life  Insurance Company,  Toronto;  director of
                                Jaguar Limited,  United  Kingdom;  and a  member  of  the  European
                                Advisory  Board  of Boral  Limited,  Australia. He  is  an honorary
                                president of Eurogypsum; a member  of the Council and Treasurer  of
                                the  Royal Society  for the  Encouragement of  Arts, Manufactures &
                                Commerce, United  Kingdom  and  a  member  of  the  Institution  of
                                Chemical   Engineers.  Mr.  Turner  has  been  a  director  of  the
                                Corporation
</TABLE>

                                       56
<PAGE>
<TABLE>
<CAPTION>
                                                                                                      YEAR FIRST
                                                       PRINCIPAL OCCUPATION,                            BECAME
                                                   FIVE YEAR EMPLOYMENT HISTORY                        DIRECTOR
         NAME AND AGE                                 AND OTHER DIRECTORSHIPS                          AND CLASS
- ------------------------------  -------------------------------------------------------------------  -------------
<S>                             <C>                                                                   <C>
                                since May 1984 and is a  member of the Board's Audit Committee  and
                                Committee  on  Directors.  (BPB  Industries  plc,  London, England,
                                beneficially owns 1,000 shares of common stock of the Corporation).
Barry L. Zubrow, 40             Partner (since 1988) of Goldman,  Sachs & Co., investment  bankers.      1993
                                Mr.  Zubrow  is a  member  of the  Board  of Managers  of Haverford   Class 1996
                                College. He has been a director  of the Corporation since May  1993
                                and  is a member of the  Board's Finance Committee and Committee on
                                Directors.
</TABLE>

EXECUTIVE OFFICERS OF THE CORPORATION (WHO ARE NOT DIRECTORS)

<TABLE>
<CAPTION>
                                                                                                    HAS HELD
                NAME, AGE                                                                            PRESENT
          AND PRESENT POSITION                PRIOR BUSINESS EXPERIENCE IN PAST FIVE YEARS       POSITION SINCE
- -----------------------------------------  --------------------------------------------------  -------------------
<S>                                        <C>                                                 <C>
William C. Foote, 42                       Senior Vice  President,  USG  Interiors,  Inc.  to     January 1994
President and Chief Operating Officer      March  1989;  Senior  Vice  President  and General
                                           Manager,  Central  Construction  Products  Region,
                                           United  States  Gypsum Company  to  November 1990;
                                           Executive  Vice  President  and  Chief   Operating
                                           Officer, L&W Supply Corporation to September 1991;
                                           President  and Chief Executive Officer, L&W Supply
                                           Corporation from September  1991 through  December
                                           1993;  President and Chief  Executive Officer, USG
                                           Interiors, Inc. from January 1993 through December
                                           1993.
Arthur G. Leisten, 52                      Vice President  and  General  Counsel  to  January      March 1993
Senior Vice President, General Counsel     1990; Senior Vice President and General Counsel to
and Secretary                              March 1993.
P. Jack O'Bryan, 57                        Senior Vice President and General Manager, Central     January 1993
Senior Vice President and Chief            Construction Products Region, United States Gypsum
Technology Officer                         Company   to  March  1989;   President  and  Chief
                                           Executive Officer, United States Gypsum Company to
                                           January 1993.
Harold E. Pendexter, Jr., 59               Vice   President,   Human   Resources   and    Ad-     January 1991
Senior Vice President and Chief            ministration   to   January   1990;   Senior  Vice
Administrative Officer                     President, Human Resources  and Administration  to
                                           January 1991.
Raymond T. Belz, 52                        Vice   President  Finance,  United  States  Gypsum     January 1994
Vice President and Controller; Vice        Company to December 1990; Vice President Financial
President Financial Services, U.S. Gypsum  Services,  United  States  Gypsum  Company   since
Company                                    January 1991.
Brian W. Burrows, 54                       Same position.                                          March 1987
Vice President, Research and Development
</TABLE>

                                       57
<PAGE>
<TABLE>
<CAPTION>
                                                                                                    HAS HELD
                NAME, AGE                                                                            PRESENT
          AND PRESENT POSITION                PRIOR BUSINESS EXPERIENCE IN PAST FIVE YEARS       POSITION SINCE
- -----------------------------------------  --------------------------------------------------  -------------------
<S>                                        <C>                                                 <C>
Richard H. Fleming, 46                     Vice   President   Finance  and   Chief  Financial     January 1994
Vice President and Chief Financial         Officer, Masonite  Corporation to  February  1989;
Officer                                    Director,  Corporate  Finance, USG  Corporation to
                                           January 1991;  Vice  President  and  Treasurer  to
                                           December 1993.
Matthew P. Gonring, 38                     Director,   Public  Relations   to  January  1991;      March 1993
Vice President, Corporate Communications   Director Corporate Communications to March 1993.
J. Bradford James, 46                      Vice  President,  Finance  &  Administration,  USG     January 1994
Vice President; President and Chief        Interiors, Inc. to March 1989; Director, Corporate
Executive Officer, USG Interiors, Inc.     Strategic   Planning,  USG  Corporation  and  Vice
                                           President,   Finance    &   Administration,    USG
                                           Interiors,  Inc. to January  1990; Vice President,
                                           Financial and Strategic Planning, USG  Corporation
                                           to   January  1991;   Vice  President   and  Chief
                                           Financial Officer, USG Corporation to March  1993;
                                           Senior  Vice President and Chief Financial Officer
                                           to December 1993.
John E. Malone, 50                         Vice President and Controller, USG Corporation  to     January 1994
Vice President and Treasurer; Vice         December  1993;  Vice  President  --  Finance, USG
President -- Finance, USG International,   International, Ltd. since March 1993.
Ltd.
James S. Phillips, 63                      Vice President, National  Accounts, United  States     December 1990
Vice President, Corporate Accounts         Gypsum  Company  to  March  1989;  Vice  President
                                           National Accounts,  USG  Corporation  to  December
                                           1990.
Donald E. Roller, 55                       Executive   Vice  President  and  Chief  Operating     January 1994
Vice President; President and Chief        Officer,  USG  Interiors,  Inc.  to  March   1989;
Executive Officer, United States Gypsum    President   and   Chief  Executive   Officer,  USG
Company                                    Interiors, Inc.  to  January 1993;  President  and
                                           Chief  Executive  Officer,  United  States  Gypsum
                                           Company since January 1993.
Stanley R. Sak, 52                         Group   Vice   President,   Ceiling   Group,   USG     January 1994
Vice President; President and Chief        Interiors,  Inc.  to  March  1989;  Executive Vice
Executive Officer, USG International,      President, USG  Interiors, Inc.  to October  1990;
Ltd.                                       President   and   Chief  Executive   Officer,  USG
                                           International, Ltd since October 1990.
S. Gary Snodgrass, 42                      Vice President  Human  Resources,  USG  Interiors,     January 1994
Vice President, Human                      Inc.  to December 1989;  Director, Corporate Human
Resources -- Operations                    Resources  Planning,  USG  Corporation  and   Vice
                                           President, Human Resources, USG Interiors, Inc. to
                                           November  1990;  Director,  Human  Resources,  USG
                                           Corporation to  September  1992;  Vice  President,
                                           Management  Resources  and  Employee  Relations to
                                           December 1993.
</TABLE>

                                       58
<PAGE>
<TABLE>
<CAPTION>
                                                                                                    HAS HELD
                NAME, AGE                                                                            PRESENT
          AND PRESENT POSITION                PRIOR BUSINESS EXPERIENCE IN PAST FIVE YEARS       POSITION SINCE
- -----------------------------------------  --------------------------------------------------  -------------------
<S>                                        <C>                                                 <C>
Dean H. Goossen, 46                        General Counsel  and  Secretary,  Arthur  J.  Gal-     February 1993
Assistant Secretary                        lagher  &  Co.  to 1989;  Vice  President, General
                                           Counsel and  Secretary, Xerox  Financial  Services
                                           Life Insurance Company to February 1993.
William R.C. Macdonald, 47                 Executive  Vice President, Operations, CGC Inc. to      March 1989
President and Chief Executive Officer,     March 1989.
CGC, Inc.
Frank R. Wall, 60                          Senior Vice President and General Manager, Western     January 1994
President and Chief Executive Officer,     Construction Products Region, United States Gypsum
L&W Supply Corporation                     Company to  January 1990;  Senior Vice  President,
                                           Operating  Services, United  States Gypsum Company
                                           to April 1993; Executive Vice President and  Chief
                                           Operating   Officer,  L&W  Supply  Corporation  to
                                           December 1993.
</TABLE>

EXECUTIVE COMPENSATION AND BENEFITS

    The  discussion  that  follows  has  been  prepared  based  on  the   actual
compensation  paid and benefits provided by the Corporation and its subsidiaries
to the  five most  highly  compensated executive  officers of  the  Corporation,
including for this purpose two executive officers of the Corporation's operating
subsidiaries  (collectively,  the  "Named  Executives")  for  services performed
during 1992  and  the other  periods  indicated.  This historical  data  is  not
necessarily  indicative of the compensation and benefits that may be provided to
such persons in the future.

    In  general,  the   Prepackaged  Plan  provided   for  the  assumption   and
continuation  by the  Corporation of  its existing  employment, compensation and
benefit arrangements. However, the consummation of the Prepackaged Plan resulted
in a substantial reduction in the  amounts otherwise potentially payable to  the
Named  Executives in 1994 under  the Corporation's three-year Incentive Recovery
Program (the "IRP") and the concurrent  cash settlement of such reduced  awards.
The  Named Executives received  the following amounts (which  will be taken into
account for  purposes  of  computing  benefits under  the  retirement  plan  and
supplemental  retirement  plan  described  below) upon  the  settlement  of such
reduced awards:  Mr. Connolly:  $1,164,005; Mr.  Falvo: $800,168;  Mr.  O'Bryan:
$470,448; Mr. Roller: $446,614; and Mr. Pendexter: $408,524. Although no further
awards  will be made to the Named Executives under the IRP, the Named Executives
are eligible for incentive awards under the Corporation's 1993 Annual  Incentive
Program.

    In  addition,  the  consummation of  the  Prepackaged Plan  resulted  in the
cancellation of all existing stock options held by the Named Executives  without
the  payment  of any  consideration therefor  and in  extreme dilution  of their
existing  restricted  and  deferred   stock  awards.  However,  the   Management
Performance  Plan  has been  continued and  the  Prepackaged Plan  provides that
options to purchase up to [2,788,000] shares of Common Stock (representing  7.5%
of  the  number of  shares  of Common  Stock  outstanding immediately  after the
consummation  of  the  Prepackaged  Plan)   will  be  reserved  for   management
incentives,  and that  options to  purchase up to  1,673,000 of  those shares of
Common Stock (representing 4.5% of such  number of outstanding shares) could  be
granted immediately after the consummation of the Prepackaged Plan. Accordingly,
options  for 1,673,000 shares of Common Stock were granted on June 1, 1993 to 45
individuals at an exercise  price of $10.3125 per  share. These options vest  at
the  rate of one-third of the  aggregate grant on each of  June 1, 1994, June 1,
1995 and June 1,  1996 (except for  a grant of 50,000  shares to one  individual
which  is expected to vest in full in 1994 in conjunction with that individual's
retirement). The Prepackaged Plan  also provides that, prior  to June 22,  1997,
the  Corporation will not issue, award  or grant, for compensatory purposes, any
stock (including

                                       59
<PAGE>
restricted  and  deferred  stock  grants  and  awards),  stock  options,   stock
appreciation  rights  or  other  stock-based  awards,  except  for  the  options
described above or pursuant to a new approval by the Corporation's stockholders.

THREE-YEAR COMPENSATION SUMMARY

    The following  table summarizes  for the  years indicated  the  compensation
awarded  to, earned by or paid to  the Named Executives for services rendered in
all capacities to the Corporation and its subsidiaries.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                 LONG TERM COMPENSATION
                                                              -----------------------------
                                       ANNUAL COMPENSATION
                                      ----------------------         AWARDS
                                                      OTHER   --------------------  PAYOUTS
                                                      ANNUAL  RESTRICTED            -------  ALL OTHER
                                                      COMPEN-   STOCK     OPTIONS/   LTIP     COMPEN-
           NAME AND                   SALARY   BONUS  SATION  AWARD(S)*    SARS**   PAYOUTS  SATION***
      PRINCIPAL POSITION        YEAR    ($)     ($)    ($)       ($)        (#)       ($)       ($)
- ------------------------------  ----  -------  -----  ------  ----------  --------  -------  ---------
<S>                             <C>   <C>      <C>    <C>     <C>         <C>       <C>      <C>
Eugene B. Connolly ...........  1992  555,000    --     --           --        --       --       530
 Chairman of the Board, and     1991  475,000    --     --      213,750        --       --       530
 CEO                            1990  404,167    --     --      215,325    87,100       --        --
Anthony J. Falvo, Jr. ........  1992  432,500    --     --           --        --       --       530
 Vice Chairman                  1991  376,667    --     --      142,500        --       --       530
                                1990  320,000    --     --       86,625    35,200       --        --
P. Jack O'Bryan ..............  1992  256,000    --     --           --        --       --       530
 Senior Vice President and      1991  236,750    --     --       83,125        --       --       530
 Chief Technology Officer       1990  216,000    --     --       87,038    35,200       --        --
Donald E. Roller .............  1992  250,000    --     --           --        --       --       530
 President and CEO, United      1991  233,333    --     --       83,125        --       --       530
 States Gypsum Company          1990  214,000    --     --       44,138    17,800       --        --
Harold E. Pendexter, Jr. .....  1992  242,500    --     --           --        --       --       530
 Senior Vice President and      1991  210,000    --     --       83,125        --       --       530
 Chief Administrative Officer   1990  180,000    --     --       22,688     9,200       --        --
<FN>
- ------------------------------
*   The amounts shown reflect the value (determined by the closing price of  the
    Corporation's  common stock on  the New York  Stock Exchange on  the date of
    grant) of  grants  of  restricted  stock  awards  made  in  1990  and  1991,
    respectively,  under the Management Performance  Plan. The shares subject to
    some of these awards will  vest no later than  the tenth anniversary of  the
    applicable  date of  grant, subject to  acceleration upon  the attainment of
    specified performance objectives, and include the right to receive dividends
    paid to stockholders generally. None of the restricted stock awards vests in
    less than three years from the date of grant. As of December 31, 1992,  none
    of  such shares had vested and no  dividends were paid by the Corporation in
    1990, 1991  or  1992. As  of  December 31,  1992,  the aggregate  number  of
    restricted  shares held  by each of  the Named Executives  and the aggregate
    value thereof, determined  with reference  to closing prices  on such  date,
    were  as follows: Mr.  Connolly: 142,200 shares,  $79,988; Mr. Falvo: 81,000
    shares, $45,563; Mr.  O'Bryan: 56,100  shares, $31,556;  Mr. Roller:  45,700
    shares,   $25,706,  and   Mr.  Pendexter:   40,500  shares,   $22,781.  Upon
    consummation  of  the  Restructuring,  the  restricted  stock  awards   were
    subjected  to a one for  50 reverse stock split.  The closing sales price of
    the Common Stock on the NYSE on May 6, 1993, before the reverse stock  split
    and  the issuance of Common Stock in conjunction with the Restructuring, was
    $0.28.
**  All of these options were  cancelled on May 6,  1993 without payment of  any
    consideration therefor to the holders thereof.
*** All   other  compensation   for  the  Named   Executives  includes  matching
    contributions from  the  Corporation  to  the account  of  each  such  Named
    Executive in the USG Corporation Investment Plan.
</TABLE>

EMPLOYMENT AGREEMENTS

    In  order  to  assure  continued  availability  of  services  of  the  Named
Executives, on various dates prior to 1992, the Corporation (or, in the case  of
Mr.  Roller, U.S.  Gypsum) entered  into employment  agreements (the "Employment
Agreements") with the Named Executives. The Employment Agreements, which do  not
by their terms provide for renewal or extension, terminate on December 31, 1996.

                                       60
<PAGE>
    The  Employment Agreements provide for minimum annual salaries to be paid at
normal pay periods and at normal intervals to Mr. Connolly ($450,000), Mr. Falvo
($360,000), Mr.  O'Bryan ($235,000),  Mr. Roller  ($230,000) and  Mr.  Pendexter
($200,000).  The Employment Agreements require  that each Named Executive devote
his full attention  and best efforts  during the  term of his  Agreement to  the
performance  of assigned  duties. If  a Named Executive  during the  term of his
Agreement is discharged  without cause by  the Corporation, he  may elect to  be
treated  as a continuing employee under his Agreement, with salary continuing at
the minimum rate specified  in such Agreement  or at the rate  in effect at  the
time  of discharge, if greater, for the balance of the term of such Agreement or
for a period of two years, whichever is greater. In the event of any such salary
continuation, certain benefits will be continued at corresponding levels and for
the same period of time. If a  Named Executive becomes disabled during the  term
of  his  Agreement, his  compensation continues  for the  unexpired term  of the
Agreement at the rate in effect at the inception of the disability. In the event
of a Named Executive's death during the  term of his Agreement, one-half of  his
full rate of compensation in effect at the time of his death will be paid to his
beneficiary for the remainder of the term of the Agreement.

    Each  of the  Named Executives  has undertaken,  while employment  under his
Employment Agreement continues and for a  period of three years thereafter,  not
to  participate, directly or  indirectly, in any  enterprise which competes with
the Corporation or any of its subsidiaries in any line of products in any region
of the United States. Each Named Executive has also agreed not to, at any  time,
use  for his benefit or the  benefit of others or disclose  to others any of the
Corporation's confidential information except as required by the performance  of
his duties under his Employment Agreement.

TERMINATION COMPENSATION AGREEMENTS

    The   Corporation  is   a  party  to   termination  compensation  agreements
("Termination  Compensation  Agreements")  with   the  Named  Executives.   Each
Termination  Compensation Agreement provides that it will terminate at the close
of business on December 31, 1995, or upon the Named Executive attaining age  65,
whichever comes first.

    The  Termination  Compensation Agreements  provide  certain benefits  in the
event any change in control occurs and termination of employment follows  within
three  years  thereafter  or prior  to  the  Named Executive  attaining  age 65,
whichever is earlier, but only if  such termination occurs under one of  several
sets  of identified circumstances. Such circumstances include termination by the
Corporation other than for cause and termination by the Named Executive for good
reason. Each  change in  control will  begin  a new  three-year period  for  the
foregoing purposes. For purposes of the Termination Compensation Agreements, (i)
a  "change in control" is deemed to have  occurred, in general, if any person or
group of persons acquires  beneficial ownership of 20%  or more of the  combined
voting  power of the Corporation's  then-outstanding voting securities, if there
is a change in a majority of the members of the Board within a two-year  period,
and  in certain other events;  (ii) the term "cause"  is defined as, in general,
the willful  and  continued failure  by  the Named  Executive  substantially  to
perform his duties after a demand for substantial performance has been delivered
or the willful engaging of the Named Executive in misconduct which is materially
injurious  to the  Corporation; and (iii)  "good reason" for  termination by the
Named Executive  with a  right to  benefits under  the Termination  Compensation
Agreements  means, in  general, termination  subsequent to  a change  in control
based on specified  changes in the  Named Executive's duties,  responsibilities,
titles, offices or office location, reductions in base salary, specified changes
to  bonus, benefit,  compensation, retirement or  similar plans or  to the Named
Executive's participation therein or a reduction in any fringe benefits or  paid
vacation days.

    Under  the  Termination  Compensation  Agreements,  upon  the  Corporation's
termination of the Named Executive following a change in control other than  for
cause  or the  Named Executive's termination  following a change  in control for
good reason, the Corporation  is obligated to pay  the Named Executive his  full
base salary through the date of termination at the rate in effect at the time of
notice of termination, any unpaid bonus for a past fiscal year, and the pro rata
portion  of bonus  for the  then-current fiscal  year, and  to continue  for the
benefit of  the  Named Executive  through  the  date of  termination  all  stock
ownership,  purchase and option plans and insurance and other benefit plans. The
Termination

                                       61
<PAGE>
Compensation Agreements also provide  that in the event  of a change in  control
and  termination of the kind  which gives rise to  benefits, the Named Executive
involved will be entitled to  payment of a lump sum  amount equal to 2.99  times
the  sum of  (i) his  then-annual base  salary, computed  at 12  times his then-
current monthly  pay  and  (ii)  his  full  year  position  par  bonus  for  the
then-current fiscal year. Such lump sum amount will be subject to all applicable
federal  and state income  taxes; provided that  if such lump  sum amount or any
other payments or benefits  which such Named Executive  has received or has  the
right  to  receive  from  the  Corporation,  would,  either  alone  or together,
constitute an "excess parachute  payment" under the  Internal Revenue Code,  the
total  of  such lump  sum  amount plus  any such  payments  or benefits  will be
increased by an amount sufficient to provide, after all federal excise taxes and
federal and state income taxes attributable to such increase, a net amount equal
to the federal excise tax on such total calculated as described above and before
any such excise tax. In addition, under the Termination Compensation Agreements,
the Corporation  is required  to maintain  in full  force and  effect until  the
earlier  of (i) two years after the date  of any termination which gives rise to
benefits  under  any  of  the  Termination  Compensation  Agreements  and   (ii)
commencement by the Named Executive of full-time employment with a new employer,
all  insurance plans and arrangements in  which the Named Executive was entitled
to participate immediately prior to his termination in a manner which would give
rise to benefits  under his Agreement,  provided that if  such participation  is
barred  the  Corporation  will  be obligated  to  provide  substantially similar
benefits. In the event of any termination which gives rise to benefits under any
of the  Termination  Compensation Agreements,  the  Corporation is  required  to
credit  the Named Executive with three years  of benefit and credited service in
addition to the total number of years of benefit and credited service the  Named
Executive  accrued under  the USG  Corporation Retirement  Plan. See "Retirement
Plans" below. If  the Named  Executive, after  credit for  the additional  three
years,  has a total of less than  five years of credited service, he nonetheless
will be treated as if  he were fully vested under  that Plan, but with  benefits
calculated  solely  on  the  basis  of such  total  benefit  service.  Under the
Termination Compensation Agreements, the Corporation is obligated to pay to  the
Named  Executive all legal fees and expenses incurred  by him as a result of the
kind of termination which gives rise to benefits under the Agreement,  including
all  fees and expenses incurred in  contesting or disputing any such termination
or in seeking  to obtain or  enforce any  right or benefit  provided under  such
Agreement.  No amounts are payable under the Termination Compensation Agreements
if the Named Executive's employment is terminated by the Corporation for "cause"
or if the Named Executive terminates  his employment and "good reason" does  not
exist.

    Although  Water Street's receipt of Common  Stock under the Prepackaged Plan
constituted a "change in control" under the Termination Compensation Agreements,
each of the Named Executives agreed that Water Street's receipt of Common  Stock
under  the  Prepackaged Plan  did not  constitute a  "change in  control". Their
agreement does not constitute a  waiver of any other  occurrence of a change  in
control.

    The  Corporation  has established  a so-called  "rabbi  trust" to  provide a
source of  payment  for benefits  payable  under each  Termination  Compensation
Agreement.  Immediately upon any change in  control, the Corporation may deposit
with the  trustee  under  such  trust  an amount  the  proper  officers  of  the
Corporation  reasonably  estimate could  potentially be  payable under  all such
Agreements, taking into account any previous deposits. The Corporation, however,
did not make any such deposit to the trust as a result of Water Street's current
ownership. In the event that the assets of such trust in fact prove insufficient
to provide for benefits payable  under all Termination Compensation  Agreements,
the shortfall would be paid directly by the Corporation from its general assets.

RETIREMENT PLANS

    The  following table  shows the annual  pension benefits  on a straight-life
annuity basis for  retirement at normal  retirement age under  the terms of  the
Corporation's  contributory retirement plan (the  "Retirement Plan"), before the
applicable offset of one-half of the primary social security benefits at time of
retirement. The table has been prepared for various compensation classifications
and representative years of credited service under the Plan. Each  participating
employee contributes towards the cost of his

                                       62
<PAGE>
or  her retirement benefit. Retirement benefits are based on the average rate of
annual covered compensation during the three consecutive years of highest annual
compensation in the  ten years of  employment immediately preceding  retirement.
Participants  become  fully  vested  after  five  years  of  continuous credited
service.

                             RETIREMENT PLAN TABLE

<TABLE>
<CAPTION>
                                                       YEARS OF CREDITED SERVICE
                 COVERED                   --------------------------------------------------
              COMPENSATION                     10           20           30           40
- -----------------------------------------  -----------  -----------  -----------  -----------
<S>                                        <C>          <C>          <C>          <C>
$200,000.................................  $    32,000  $    64,000  $    96,000  $   128,000
 300,000.................................       48,000       96,000      144,000      192,000
 400,000.................................       64,000      128,000      192,000      256,000
 500,000.................................       80,000      160,000      240,000      320,000
 600,000.................................       96,000      192,000      288,000      384,000
 700,000.................................      112,000      224,000      336,000      448,000
 800,000.................................      128,000      256,000      384,000      512,000
</TABLE>

    The  Named  Executives  participate  in  the  Retirement  Plan.  The   Named
Executives'  full years of continuous credited service at December 31, 1992 were
as follows: Mr. Connolly: 34;  Mr. Falvo: 37; Mr.  O'Bryan: 34; Mr. Roller:  32;
and  Mr. Pendexter: 35.  Compensation under the  Retirement Plan includes salary
and incentive compensation for the year in which payments are made.

    Pursuant to a supplemental retirement  plan, the Corporation has  undertaken
to  pay  any  retirement  benefits  otherwise  payable  to  certain individuals,
including  the  Named   Executives,  under  the   terms  of  the   Corporation's
contributory  Retirement Plan  but for provisions  of the  Internal Revenue Code
limiting  amounts  payable  under  tax-qualified  retirement  plans  in  certain
circumstances.  The  Corporation has  established a  so-called "rabbi  trust" to
provide a source of payment for  benefits under this supplemental plan.  Amounts
have  been deposited in this trust from time to time as necessary to assure that
it is adequately  funded in light  of changes in  amounts of compensation  paid,
participants  in the supplemental retirement plan and other appropriate factors.
In  addition,   the  Corporation   has  authorized   establishment  by   certain
individuals, including the Named Executives, of special retirement accounts with
independent  financial  institutions  as  an  additional  means  of  funding the
Corporation's obligations to make such supplemental payments.

DIRECTOR COMPENSATION

    Directors who are not employees of the Corporation are presently entitled to
receive a retainer of $6,000 per quarter, plus  a fee of $900 for each Board  or
Board committee meeting attended. A non-employee director serving as chairman of
a  committee is entitled to receive an additional retainer of $1,000 per quarter
for each such chairmanship. Additional fees for pre-meeting consultations may be
paid as applicable to non-employee directors, the amount of such fees to bear  a
reasonable  relationship to  the regular meeting  fee of $900  and the customary
length of  a  meeting  of the  Board  committee  involved. No  director  of  the
Corporation  has received any compensation of any kind for serving as a director
while also serving as an officer or other employee of the Corporation or any  of
its Subsidiaries.

    In  the past,  the Corporation has  entered into  consulting agreements with
retiring non-employee directors who had specified minimum periods of service  on
the  Board.  Those agreements  continued the  annualized  retainer which  was in
effect in each instance at the time  of retirement from the Board in return  for
an undertaking to serve in an advisory capacity and to refrain from any activity
in  conflict or in competition with the Corporation. The Board has determined to
continue to  offer  such  agreements  on  a  case-by-case  basis  but  also  has
determined to limit any such agreement to a term not to exceed five years.

                                       63
<PAGE>
                           OWNERSHIP OF COMMON STOCK

SELLING STOCKHOLDER AND ITS AFFILIATES
    The  following table sets forth certain information regarding the beneficial
ownership of the Common Stock of  the Selling Stockholder and its affiliates  as
of  December 31,  1993 and  as adjusted  to reflect  its sale  of shares  in the
Offering. See "Certain Relationships and Related Transactions."

<TABLE>
<CAPTION>
                                           SHARES OWNED BEFORE THE                     SHARES OWNED AFTER THE
                                                 OFFERING(A)             SHARES             OFFERING(A)
                                         ----------------------------     BEING     ----------------------------
NAME AND ADDRESS                            NUMBER         PERCENT       OFFERED       NUMBER         PERCENT
- ---------------------------------------  -------------  -------------  -----------  -------------  -------------
<S>                                      <C>            <C>            <C>          <C>            <C>
Water Street Corporate Recovery Fund I,
L.P. and affiliates....................     16,105,840          43%      2,500,000     13,605,840          32%
85 Broad Street
New York, New York 10004
<FN>
- ------------------------
(a)   Water Street owns directly 15,893,231  shares of Common Stock and  116,070
      Warrants  that  are  currently  exercisable.  Goldman,  Sachs  &  Co. owns
      directly 96,539 shares  of Common  Stock and,  as the  general partner  of
      Water  Street, may be deemed to be  the beneficial owner of the 15,893,231
      shares of  Common  Stock and  116,070  Warrants owned  directly  by  Water
      Street.  Such shares  and Warrants may  also be deemed  to be beneficially
      owned by The  Goldman Sachs Group,  L.P., one of  the general partners  of
      Goldman,  Sachs & Co.  Goldman, Sachs &  Co. and The  Goldman Sachs Group,
      L.P. disclaim beneficial ownership  of shares and  Warrants held by  Water
      Street  to the  extent partnership interests  in Water Street  are held by
      persons other than Goldman, Sachs & Co., The Goldman Sachs Group, L.P. and
      their affiliates.
</TABLE>

OTHER 5% STOCKHOLDERS

    In addition to the Selling  Stockholder and its affiliates, the  Corporation
believes  that  affiliates  of  Fidelity  Investments  of  Boston, Massachusetts
beneficially own in excess of 5% of the outstanding Common Stock.

                                       64
<PAGE>
DIRECTORS AND EXECUTIVE OFFICERS
    The following  table  sets  forth  information  as  of  September  30,  1993
regarding  the beneficial ownership of Common Stock  by each director and by all
directors and executive  officers of the  Corporation as a  group (29  persons).
Such  information is derived from the filings  made with the SEC by such persons
under Section 16(a) of the Exchange Act. The totals include any shares allocated
to the accounts of  those individuals through September  30, 1993 under the  USG
Corporation Investment Plan.

<TABLE>
<CAPTION>
                                                               SHARES
                                                            BENEFICIALLY     PERCENT
NAME                                                            OWNED       OF CLASS
- ----------------------------------------------------------  -------------  -----------
<S>                                                         <C>            <C>
Robert L. Barnett.........................................             20
Keith A. Brown............................................        119,256
W. H. Clark...............................................          1,248
Eugene B. Connolly........................................          7,789
James C. Cotting..........................................             20
Lawrence M. Crutcher......................................          1,800
Anthony J. Falvo, Jr......................................          6,852
Wade Fetzer III...........................................             **       *
David W. Fox..............................................            112
Philip C. Jackson, Jr.....................................          1,963
Marvin E. Lesser..........................................            500
John B. Schwemm...........................................            154
Alan G. Turner............................................              0
Barry L. Zubrow...........................................             **
All current directors and present executive officers as a
 group (29 persons), including those current directors
 named above..............................................        167,021
<FN>
- ------------------------
*     Total beneficial ownership of 167,021 shares of Common Stock by members of
      the  group  identified above  represents approximately  0.5% of  the total
      outstanding shares  of Common  Stock, excluding  the shares  that  Messrs.
      Fetzer  and Zubrow may be  deemed to beneficially own  as described in the
      following note. No director had a right to acquire beneficial ownership of
      any shares of Common Stock within 60 days after September 30, 1993  except
      as  described in the  following note and except  pursuant to Warrants that
      are currently  exercisable as  follows: Mr.  Brown, 16,458  Warrants;  Mr.
      Connolly, 1,003 Warrants; Mr. Falvo, 1,003 Warrants; Mr. Fox, 19 Warrants;
      Mr.  Jackson, 879 Warrants; Mr. Schwemm, 25 Warrants. The above table also
      excludes options to purchase  an aggregate of  1,293,000 shares of  Common
      Stock which are not exercisable within 60 days after September 30, 1993.
**    Messrs.  Fetzer and Zubrow are general partners of Goldman, Sachs & Co. As
      general partners,  Messrs. Fetzer  and  Zubrow may  be  deemed to  be  the
      beneficial owners of shares beneficially owned or held by Goldman, Sachs &
      Co.  and  its affiliates,  including Water  Street  and The  Goldman Sachs
      Group, L.P. As described above, Goldman, Sachs & Co. owns directly  96,539
      shares of Common Stock and, as the general partner of Water Street, may be
      deemed to be the beneficial owner of the 15,893,231 shares of Common Stock
      and  116,070 Warrants owned  directly by Water  Street. Messrs. Zubrow and
      Fetzer disclaim beneficial  ownership of  such shares  and Warrants  other
      than  to  the  extent  such  ownership  corresponds  to  their  respective
      percentage interests in  Goldman, Sachs  & Co., The  Goldman Sachs  Group,
      L.P. and Water Street.
</TABLE>

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

AGREEMENT WITH WATER STREET ENTITIES
    On  February  25,  1993,  the  Corporation  entered  into  the  Water Street
Agreement. The Water  Street Agreement,  among other things,  (i) restricts  the
Water  Street Entities from purchasing, or offering or agreeing to purchase, any
shares of Common  Stock or other  voting securities of  the Corporation,  except

                                       65
<PAGE>
for  Permitted  Acquisitions  (as defined  in  the Water  Street  Agreement) and
acquisitions by any  Water Street Entity  other than  Water Street of  up to  an
aggregate  of 10% of the then outstanding shares of Common Stock in the ordinary
course of its business;  (ii) requires (a)  Water Street to  vote all shares  of
Common  Stock and other voting securities  of the Corporation beneficially owned
by it and (b) the other Water Street Entities to vote all shares of Common Stock
beneficially owned by them in  excess of 10% of  the then outstanding shares  of
Common  Stock, in  each case, in  the same proportion  as the votes  cast by all
other holders of Common  Stock and other voting  securities of the  Corporation,
subject  to certain exceptions described below; (iii) places restrictions on the
ability of the Water Street Entities to  transfer shares of Common Stock to  any
person,  except for (a) sales consistent with  Rule 144 of the Securities Act of
1933, (b) underwritten public offerings, (c) persons not known to be 5% holders,
(d) pledgees who agree  to be bound  by certain provisions  of the Water  Street
Agreement,  (e) in  the case  of Water  Street, distributions  to Water Street's
partners in accordance with the governing partnership agreement, (f) pursuant to
certain tender or exchange offers for shares of Common Stock and (g) pursuant to
transactions approved  by the  Board; (iv)  provides Water  Street with  certain
rights  to nominate directors  to the Board and  Finance Committee (as described
below); (v)  requires  the maintenance  of  directors' and  officers'  liability
insurance  and  indemnification  rights; (vi)  requires  that  the Corporation's
shareholder rights plan  provide temporary  exemptions for  ownership of  Common
Stock by the Water Street Entities; (vii) provides Water Street with four demand
registrations   and  unlimited  piggyback   registrations,  subject  to  certain
limitations described  below; and  (viii) provides  for indemnification  by  the
Corporation of Water Street, its underwriters and related parties for securities
law  claims  related to  any demand  or  piggyback registration  contemplated in
clause (vii) above.

    In connection  with  the  Restructuring,  Water  Street  nominated  two  New
Directors  to the Board, Wade Fetzer III and Barry L. Zubrow. See "Management --
Directors of the Corporation." In the event that the Water Street Directors  are
removed  from office without the consent  of Water Street, then the restrictions
on the Water Street Entities relating to (i) the purchases of voting  securities
of  the  Corporation  other  than Permitted  Acquisitions,  (ii)  the  voting of
securities of the Corporation and (iii) the transfer of shares of Common  Stock,
as  described above,  shall terminate.  These restrictions  shall also terminate
upon the earliest to occur of:  (i) the consummation of a merger,  consolidation
or  other  business  combination  to  which  the  Corporation  is  a constituent
corporation, if  the stockholders  of the  Corporation immediately  before  such
merger,  consolidation or combination do  not own more than  50% of the combined
voting power  of  the  then  outstanding  voting  securities  of  the  surviving
corporation,  (ii) the Board consisting of  a majority of directors not approved
by a vote of the  directors serving at the time  the Water Street Agreement  was
executed,  and (iii)  the tenth  anniversary of  the Water  Street Agreement. In
addition, the restrictions on  purchases of voting  securities and transfers  of
Common  Stock shall  also terminate upon  the Water Street  Entities owning less
than 5% of the then outstanding shares of Common Stock.

    Furthermore, the Water  Street Entities will  not be subject  to the  voting
restrictions contained in the Water Street Agreement if, among other things: (i)
the  Corporation defaults on the payment of principal or interest required to be
paid pursuant to any indebtedness if  the aggregate amount of such  indebtedness
is  $25  million  or  more;  (ii) the  principal  of  any  of  the Corporation's
indebtedness is declared due  and payable prior  to the date  on which it  would
otherwise become due and payable if the aggregate amount of such indebtedness is
$25  million  or more;  (iii) any  person  other than  Water Street  becomes the
beneficial owner  of more  than 10%  of the  then outstanding  shares of  Common
Stock;  or (iv) the Corporation fails to comply with (x) the following financial
covenants: a minimum senior  interest coverage ratio,  a minimum total  interest
coverage  ratio,  a  minimum fixed  charge  coverage ratio,  a  minimum adjusted
cumulative net  worth, and  a maximum  leverage  ratio or  (y) a  minimum  total
interest  coverage ratio of 0.63 for a specified coverage period in 1993 and for
the first quarter of  1994, 0.84 for  the second quarter of  1994, 0.97 for  the
third quarter of 1994 and 1.14 for the fourth quarter of 1994, provided that (a)
such  financial covenants  shall be calculated  based only  on domestic revenues
unless the Corporation's  non-domestic consolidated revenues  exceed 35% of  its
total  consolidated revenues, and (b) the Corporation shall not be deemed out of
compliance in the event of a breach, after 1994 and prior to 1998, of the senior
interest coverage ratio or the total interest coverage ratio unless there  shall
also  exist at such time a  breach of the fixed charge  coverage ratio or in the
event of a breach, after 1994 and prior to

                                       66
<PAGE>
1998, of the fixed charge coverage ratio  unless there shall also exist at  such
time a breach of either the senior interest coverage ratio or the total interest
coverage  ratio.  See  "Description  of Credit  Agreement."  If  the Corporation
complies with the financial covenants  within the two fiscal quarters  following
the first failure to comply, the voting restrictions shall apply again. However,
if  the  Corporation  thereafter  fails  to comply  with  any  of  the financial
covenants, the voting restrictions shall terminate.

    The provision of registration rights to Water Street under the Water  Street
Agreement  is subject to  certain limitations, including but  not limited to the
following: (i)  of Water  Street's four  demand registrations,  the  Corporation
shall  pay the  registration expenses (other  than commissions  and discounts of
underwriters) for two registrations, and the Corporation and Water Street  shall
each  pay  one-half of  the registration  expenses  (other than  commissions and
discounts of underwriters) for two registrations; and (ii) Water Street (and any
Water Street Entity  that receives  a distribution  of Common  Stock from  Water
Street and owns 5% or more of the then outstanding shares of Common Stock) shall
not  request a  demand registration  of Common  Stock during  the 180-day period
after the effective  date of the  Offering, or  during any period  in which  the
Corporation  is  actively engaged  in  a subsequent  registered  distribution of
Common Stock and  until 90  days after the  effective date  of the  registration
statement  relating to such  subsequent distribution. Except in  the case of the
Offering, the  Corporation and  Water  Street have  mutual piggyback  rights  on
registrations initiated by either, generally on a 50-50 basis.

OTHER MATTERS
    The  aggregate  amount  of  other compensation  in  the  nature  of personal
benefits in 1992 for  each of the  Named Executives did  not exceed $25,000,  or
10%,  of the  amount of  cash compensation  shown for  such individual,  and the
aggregate amount of  other compensation in  the nature of  personal benefits  in
1992  for the all executive officers  of the Corporation (the "Executive Group")
did not exceed 10% of the compensation for the entire Executive Group.

    The Corporation had entered into consulting agreements with two  individuals
included  in the Executive Group who retired  in 1991. The agreement with one of
those individuals,  which provided  for a  retainer payable  in installments  of
$4,000  per month, terminated on December 31, 1992. The agreement with the other
individual terminated at the close of business on January 31, 1992, and provided
for an annual retainer of  $36,000 for 25 work days,  supplemented by a per  day
rate of $1,000 for each day in excess of 25 work days.

                                       67
<PAGE>
                        DESCRIPTION OF CREDIT AGREEMENT

INTRODUCTION

    Pursuant  to the Prepackaged Plan, the  Credit Agreement was entered into by
the Corporation, USG Interiors and the Bank Group. The Credit Agreement  amended
and  restated a previous  credit agreement which was  entered into in connection
with the 1988 Recapitalization. In connection with the Prepackaged Plan and  the
implementation of the Credit Agreement, the following transactions occurred: (i)
$324  million of principal  and accrued but unpaid  interest on outstanding term
loans were  exchanged for  Senior 2002  Notes; (ii)  the final  maturity of  the
remaining  principal of the  term loans was  extended from 1996  to 2000 and all
scheduled principal  payments  were  deferred until  December  1994;  (iii)  $51
million in interest originally due on or after December 31, 1991 was capitalized
and  the Corporation  issued capitalized  interest notes  ("Capitalized Interest
Notes") to  represent the  capitalized amounts;  (iv) making  available (at  the
Corporation's  option but subject to certain  limitations on the availability of
LIBOR pricing) an  annual interest  rate applicable to  the term  loans and  the
Extended  Revolving Credit Facility of LIBOR plus 1 7/8% or Citibank's Alternate
Base Rate III ("Base Rate") plus 7/8%, with the option to capitalize the  amount
of such interest in excess of LIBOR plus 1% per annum (such capitalized interest
to  bear interest at an annual rate of LIBOR plus 2 1/4% or Citibank's Base Rate
plus 1  1/4% and  mature in  the years  1998 and  2000); (v)  implementation  of
mandatory prepayment provisions, including an excess cash flow sweep, that takes
into  account certain liquidity thresholds; (vi) the suspension of all financial
covenants through January 1,  1995 and providing  for new covenants  thereafter;
(vii)  the extension to 1998 of the maturity date of, and the establishment of a
maximum borrowing capacity of  $175 million under,  the then existing  revolving
credit  facility, including  a $110  million letter  of credit  subfacility (the
"Extended Revolving Credit Facility");  and (viii) the  exchange of $16  million
owed  in  connection with  certain  interest rate  swap  contracts for  an equal
principal amount  of  Senior  2002  Notes and,  in  addition,  the  exchange  of
approximately  $5  million  owed  in connection  with  such  interest  rate swap
contracts for  an  equal principal  amount  of Capitalized  Interest  Notes.  In
connection  with  the Restructuring,  all existing  defaults under  the previous
credit agreement were waived or cured.  Whenever defined terms under the  Credit
Agreement,  as amended,  are referred  to but  not defined  herein, such defined
terms are incorporated herein by reference.

    On August 10,  1993, the  parties to the  Credit Agreement  entered into  an
amendment to the Credit Agreement (the "1993 Amendments"), pursuant to which (i)
scheduled bank term loan amortization payments totaling $95 million due in 1994,
1995 and 1996 were eliminated ($3 million was added to the final maturity of the
bank  term loan  due in  2000); (ii)  $9 million  of Capitalized  Interest Notes
originally due  in  1998 were  paid;  and (iii)  the  cash sweep  mechanism  was
modified to apply up to $165 million of cash otherwise subject to the cash sweep
mechanism  in 1994, 1995  and 1996 to  repayment or purchase  of senior debt due
prior to  January  1,  1999  or  Bank Term  Loans,  at  the  discretion  of  the
Corporation.  In addition,  $46 million  of Capitalized  Interest Notes  and $92
million of Bank Term Loans were exchanged for Senior 2002 Notes. Following  such
transactions,  approximately $1 million principal amount of Capitalized Interest
Notes remained outstanding. Such  remaining amount was  repaid in December  1993
and accordingly, no Capitalized Interest Notes are outstanding.

    In connection with the Transactions, the parties to the Credit Agreement are
entering  into the Credit  Agreement Amendments, pursuant  to which, among other
things, the mandatory  prepayment provisions  and cash sweep  mechanism will  be
modified  as described below.  The Credit Agreement  Amendments require that (i)
$75 million of the proceeds  of the Note Placement be  used to prepay Bank  Term
Loans  in the order of maturity (thus fully prepaying the scheduled amortization
payment due December 31, 1997 and partially prepaying the scheduled amortization
payment due December  31, 1998)  and (ii)  $65 million  of the  proceeds of  the
Offering  be used to prepay Bank Term Loans in the order of maturity (thus fully
prepaying the  remaining  portion  of the  scheduled  amortization  payment  due
December  31, 1998). Giving effect to  such prepayments, the remaining scheduled
amortization of the Bank  Term Loans will  consist of $125  million in 1999  and
$180 million in 2000.

                                       68
<PAGE>
CREDIT AGREEMENT OVERVIEW

ELIMINATION OF ABILITY TO CAPITALIZE INTEREST

    The  Credit Agreement  Amendments provide  that USG's  ability to  defer the
payment of interest in excess of  LIBOR plus 1% by issuing Capitalized  Interest
Notes will be terminated.

EXTENDED REVOLVING CREDIT FACILITY

    The maximum borrowing capacity under the Extended Revolving Credit Facility,
as  currently  in  effect,  is  $175  million.  The  Extended  Revolving  Credit
Facility's maturity  date is  July 13,  1998. Material  conditions precedent  to
borrowing  under  the  Extended Revolving  Credit  Facility are  limited  to the
accuracy of certain representations and  warranties, the absence of  injunctions
and  of  certain events  of default,  such as  payment defaults,  bankruptcy and
certain cross-defaults to  other indebtedness of  the Corporation exceeding  $25
million  in  principal amount,  unstayed judgments  and intentional  breaches of
negative covenants, but prior to January 1, 1995 do not include the satisfaction
of financial covenants or a material adverse change condition precedent.

LETTER OF CREDIT SUBFACILITY

    The Extended  Revolving Credit  Facility also  includes a  letter of  credit
subfacility (the "Letter of Credit Subfacility"). The Issuing Bank or Banks will
issue  letters  of  credit under  the  Letter of  Credit  Subfacility ("Facility
Letters of Credit") in amounts not to exceed $110 million in the aggregate.

CASH SWEEP MECHANISM

    Under the Credit  Agreement as  currently in  effect, within  30 days  after
January  15th of each year (a "Test  Date"), commencing on January 15, 1994, the
amount of  "Cash  Available  for  Sweep" is  calculated  in  accordance  with  a
pre-determined  formula and paid to holders of  the Bank Term Loans on or before
February 15th of each year; provided that,  in the case of Test Dates  occurring
on  January 15, 1994, 1995 and 1996: (i) first, up to $165 million to either the
Corporation's public debt  having maturities prior  to January 1,  1999 or  Bank
Term  Loans  in  order  of  maturity, as  the  Corporation  shall  elect  in its
discretion (PROVIDED,  that after  the payment  or repurchase  in full  of  such
public  debt (which may occur  as a result of an  equity or debt offering), such
$165 million of Cash Available for Sweep (or remaining portion thereof) shall be
applied 90%  to  the Bank  Term  Loans  in order  of  maturity and  10%  to  the
Corporation  as Retained Amounts); and (ii)  second, two-thirds to the Bank Term
Loans in order of maturity and one-third to the Corporation as Retained  Amounts
(until  such Retained Amounts,  when added to the  Retained Amounts described in
clause (i), equal $50 million,  at which time 100%  of Cash Available for  Sweep
would  be  applied to  the Bank  Term Loans  in order  of maturity).  Cash sweep
payments applied to the Bank Term  Loans are applied one-third to the  scheduled
installments   in  the  order  of  maturity  and  two-thirds  to  the  scheduled
installments in the inverse order of maturity with respect to such payments made
on or before February 15th in each year. "Cash Available for Sweep" means,  with
respect  to each  Test Date, an  amount equal to  the product of  (i) the "Sweep
Percentage" applicable to such  Test Date and  (ii) the excess,  if any, of  the
"Available  Liquidity" for such Test Date  over the "Minimum Liquidity" for such
Test Date. The "Sweep Percentage"  is 100% for the 1994  Test Date, 90% for  the
1995  through 1998 Test  Dates, inclusive, and  85% for the  1999 and subsequent
Test Dates. "Available Liquidity" for any Test Date means (i) the daily  average
of  all  domestic cash  and  cash balances  during  the applicable  Test Period,
excluding  net  proceeds  of  certain  debt  and  equity  issuances  (which  are
separately  required to be  applied to repay  the Bank Term  Loans and/or senior
debt securities); PLUS (ii) the daily  average of all cash of the  Corporation's
non-domestic  Subsidiaries in excess of certain minimum cash balances during the
applicable Test  Period,  subject to  certain  limitations and  adjustments  for
repatriation  taxes  and exchange  rates; PLUS  (iii)  the average  daily amount
available for borrowing under the Extended Revolving Credit Facility during  the
applicable  Test  Period; SUBJECT  TO (iv)  certain  adjustments for  changes in
working capital. "Minimum Liquidity" for any Test Date means (i) the sum of  the
Retained Amount for all prior Test

                                       69
<PAGE>
Dates,   net  of  the  amount  thereof   utilized  to  fund  additional  Capital
Expenditures and repurchases  of senior  debt securities  (through the  maturity
dates  thereof); plus (ii) the  amount set forth below  opposite such Test Date;
minus (iii) the Senior Note Prepayment Amount for such Test Date:

<TABLE>
<CAPTION>
                TEST DATE                                    MINIMUM LIQUIDITY
- ------------------------------------------  ----------------------------------------------------
<S>                                         <C>
1/15/94...................................      $100,000,000 (PLUS the Asbestos Adjustment)
1/15/95...................................                      100,000,000
1/15/96...................................                      100,000,000
1/15/97...................................                      200,000,000
1/15/98...................................                      135,000,000
Thereafter................................                      100,000,000
</TABLE>

    The "Asbestos Adjustment" will equal $40 million minus the actual  aggregate
amount  of payments made by U.S. Gypsum to settle property damage asbestos cases
in 1992 and  1993. The amount  of such  settlement payments for  1992 was  $21.7
million.  "Retained Amount"  means, for  any Test Date,  an amount  equal to the
product of (i) 100% minus the Sweep  Percentage for such Test Date and (ii)  the
excess,  if any, of the Available Liquidity  for such Test Date over the Minimum
Liquidity for such  Test Date. "Senior  Note Prepayment Amount"  means, for  any
Test   Date  on  or  after  January  15,  1997,  the  principal  amount  of  the
Corporation's public debt originally due during the same calendar year which has
been prepaid as of such Test Date out of funds other than any Retained Amounts.

    The Credit Agreement Amendments will  provide that the Sweep Percentage  for
the January 15, 1997 Test Date and for each Test Date thereafter shall be 50% if
(i)  the aggregate outstanding amount  of Bank Term Loans  at such time does not
exceed $148 million and (ii) USG's public senior debt is then rated at least  BB
by Standard & Poor's Corporation and Ba2 by Moody's Investors Service, Inc.

EVENTS OF DEFAULT

    The  Credit Agreement provides that if an  event of default occurs, then, in
the case  of an  event of  default involving  certain bankruptcy  or  insolvency
events, the maturity of loans made under the Credit Agreement will automatically
be accelerated and the obligation of the Senior Lenders to make future revolving
loans  or issue letters  of credit will terminate  or, in the  case of any other
event of default, so long as such event of default exists, the Requisite  Senior
Lenders  will be  entitled to  accelerate the maturity  of loans  made under the
Credit Agreement and terminate their  obligation to make future revolving  loans
or issue letters of credit.

    Events  of default include: failure to  pay any principal, interest or other
amount due to the Senior Lenders;  failure to pay other indebtedness,  including
subordinated  debt, if  the aggregate amount  of such other  indebtedness is $25
million or more  or any  breach or default  under any  instrument, agreement  or
indenture  relating to such indebtedness if  the effect thereof is to accelerate
or permit the holders  of such indebtedness to  accelerate the maturity of  such
indebtedness;  any  single stockholder  or group  acquiring 50%  or more  of the
Corporation's stock (directly or indirectly); failure to discharge a judgment or
writ of attachment involving an amount  exceeding $5 million, net of  insurance;
certain  events involving  the bankruptcy  or insolvency  of the  Corporation or
certain significant Restricted Subsidiaries; the invalidation or ineffectiveness
of any security agreement governing, or  any lien upon, collateral securing  the
obligations  under the Credit  Agreement; the incurrence  of certain termination
liabilities under  the  Employee Retirement  Income  Security Act  of  1974,  as
amended  ("ERISA"); and failure of the Corporation to meet covenants (subject to
certain grace periods), including  various financial covenants described  below.
The  events of default are applicable only to the Corporation and its Restricted
Subsidiaries.

AFFIRMATIVE COVENANTS

    Affirmative covenants under the Credit Agreement require the Corporation to,
among  other  things,  submit  periodic  financial,  labor,  environmental   and
litigation  reports;  maintain its  corporate  existence and  franchises; remain
qualified to  do business  in  all appropriate  jurisdictions; comply  with  all
requirements  of law; pay all taxes and material claims unless contested in good
faith and covered by reserves in

                                       70
<PAGE>
accordance  with  GAAP;  permit  members  of  the  Bank  Group  to  inspect  its
properties,  books  and  records; maintain  its  properties in  good  repair and
maintain proper insurance policies; and maintain licenses, permits, governmental
approvals and authorizations.

NEGATIVE COVENANTS

    The Credit Agreement contains negative covenants that cover: restrictions on
the incurrence of additional indebtedness, subject to certain exceptions;  sales
of assets outside the ordinary course of business, subject to certain exceptions
including  a blanket exception for  up to $20 million in  any fiscal year and $5
million in  any  single  transaction  or  group  of  related  transactions;  the
incurrence  of liens and encumbrances on the property of the Corporation and its
Restricted Subsidiaries; investments;  guarantees; dividends and  distributions,
and  payments  upon securities  junior in  right to  the Bank  Debt Obligations;
operating leases; mergers, consolidations or  sales, leases or transfers of  all
or  any substantial part of the business,  property or assets of the Corporation
or any of its Restricted Subsidiaries; acquisitions of the business, property or
assets of any person,  except for acquisitions  not exceeding certain  permitted
capital   expenditure  limits;  ERISA  prohibited  transactions;  amendments  to
corporate charter and by-laws; sale of subsidiaries; amendments of material debt
documents; sale and leaseback  transactions; prepayment (including  acquisitions
for value) of long-term debt; and certain other transactions and activities.

    The  negative covenants  in the  Credit Agreement  permit the  prepayment or
purchase with  Cash  Available  for  Sweep  of  the  Corporation's  senior  debt
securities  having maturities  prior to January  1, 1999; PROVIDED,  that to the
extent such prepayment or purchase involves  the payment of a premium in  excess
of  100% of the  face amount of any  such security, such  excess will reduce the
Corporation's existing or future Retained Amounts.

                                       71
<PAGE>
FINANCIAL COVENANTS

    From and after January 1, 1995, the Corporation will be required to  satisfy
the Financial Covenants set forth below:

    MINIMUM  SENIOR INTEREST COVERAGE RATIO.  The Senior Interest Coverage Ratio
for the Coverage Period ending with each fiscal quarter of each Fiscal Year  set
forth  below (commencing with  the first fiscal  quarter of 1995),  shall not be
less than the minimum ratio set forth below opposite such fiscal quarter:

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1995        RATIO       1996        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           1.00        1           2.20
                                  2           1.25        2           2.30
                                  3           1.75        3           2.40
                                  4           2.00        4           2.50
</TABLE>

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1997        RATIO       1998        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           2.50        1           2.80
                                  2           2.60        2           2.80
                                  3           2.70        3           2.80
                                  4           2.80        4           2.80
</TABLE>

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1999        RATIO       2000        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           2.80        1           2.80
                                  2           2.80        2           2.80
                                  3           2.80        3           2.80
                                  4           2.80        4           2.80
</TABLE>

    MINIMUM TOTAL INTEREST COVERAGE  RATIO.  The  Total Interest Coverage  Ratio
for  the Coverage Period ending with each fiscal quarter of each Fiscal Year set
forth below (commencing  with the first  fiscal quarter of  1995), shall not  be
less than the minimum ratio set forth below opposite such fiscal quarter:

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1995        RATIO       1996        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           1.00        1           2.05
                                  2           1.25        2           2.10
                                  3           1.75        3           2.15
                                  4           2.00        4           2.20
</TABLE>

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1997        RATIO       1998        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           2.25        1           2.40
                                  2           2.30        2           2.40
                                  3           2.35        3           2.40
                                  4           2.40        4           2.40
</TABLE>

<TABLE>
<CAPTION>
                                           MINIMUM                 MINIMUM
                                1999        RATIO       2000        RATIO
                              ---------  -----------  ---------  -----------
<S>                           <C>        <C>          <C>        <C>
Quarter                           1           2.40        1           2.40
                                  2           2.40        2           2.40
                                  3           2.40        3           2.40
                                  4           2.40        4           2.40
</TABLE>

                                       72
<PAGE>
    MINIMUM  FIXED CHARGE COVERAGE  RATIO.  The Fixed  Charge Coverage Ratio for
the Coverage Period  ending with  each fiscal quarter  of each  Fiscal Year  set
forth  below (commencing with  the first fiscal  quarter of 1995),  shall not be
less than the minimum ratio set forth below opposite such fiscal quarter:

<TABLE>
<CAPTION>
                                            MINIMUM                   MINIMUM
                                1995         RATIO        1996         RATIO
                              ---------  -------------  ---------  -------------
<S>                           <C>        <C>            <C>        <C>
Quarter                           1              1.0        1              1.3
                                  2              1.1        2              1.4
                                  3              1.1        3              1.4
                                  4              1.2        4              1.5
</TABLE>

<TABLE>
<CAPTION>
                                            MINIMUM
                                1997         RATIO
                              ---------  -------------
<S>                           <C>        <C>
Quarter                           1              1.5
                                  2              1.5
                                  3              1.5
                                  4              1.5
</TABLE>

    MINIMUM ADJUSTED CUMULATIVE NET WORTH.  The Adjusted Cumulative Net Worth as
of the  end of  each  Fiscal Year  set forth  below  and the  end of  the  three
immediately succeeding fiscal quarters shall not be less than the minimum amount
set forth below opposite such year:

<TABLE>
<CAPTION>
END OF FISCAL YEAR                                                              MINIMUM AMOUNT
- -----------------------------------------------------------------------------  -----------------
<S>                                                                            <C>
1995.........................................................................   $ 51,000,000
1996.........................................................................     102,000,000
1997.........................................................................     179,000,000
1998.........................................................................     244,000,000
1999.........................................................................     296,000,000
2000.........................................................................     345,000,000
</TABLE>

    LEVERAGE  RATIO.  The Leverage  Ratio as of the end  of each Fiscal Year set
forth below and  the end  of the  three immediately  succeeding fiscal  quarters
shall not be greater than the maximum amount set forth below opposite such year:

<TABLE>
<CAPTION>
END OF FISCAL YEAR                                                                 MAXIMUM RATIO
- -------------------------------------------------------------------------------  -----------------
<S>                                                                              <C>
1995...........................................................................          0.97
1996...........................................................................          0.93
1997...........................................................................          0.87
1998...........................................................................          0.81
1999...........................................................................          0.76
2000...........................................................................          0.70
</TABLE>

    MINIMUM  CURRENT  RATIO.    The  ratio  of  Consolidated  Current  Assets to
Consolidated Current Liabilities as  of the end of  each calendar quarter  shall
not  be less than the minimum ratio set forth below opposite such Fiscal Year in
which such quarter occurs:

<TABLE>
<CAPTION>
FISCAL YEAR                                                                        MINIMUM RATIO
- -------------------------------------------------------------------------------  -----------------
<S>                                                                              <C>
1995...........................................................................          1.05
1996...........................................................................          1.10
1997...........................................................................          1.15
1998...........................................................................          1.20
1999...........................................................................          1.20
2000...........................................................................          1.20
</TABLE>

                                       73
<PAGE>
    MAXIMUM CAPITAL EXPENDITURES.   Domestic  Capital Expenditures  made by  the
Corporation  and its U.S. Subsidiaries on a consolidated basis shall not exceed,
for any Fiscal Year, the sum of the following items:

     (i) The Base Capital Expenditure Allowance  for such year LESS the  amount,
if  any, of such  Base Capital Expenditure  Allowance which was  used during the
immediately preceding Fiscal Year under clause (ii) below;

    (ii) (a) the  excess of the  actual cumulative principal  repayments of  the
Capitalized  Interest Notes  and the  Bank Term Loans  as a  result of mandatory
amortization payments  and  cash  flow  sweep  prepayments  over  the  Projected
Cumulative  Principal Payments  (the "Excess  Principal Payments")  LESS (b) the
cumulative  amount  of   such  Excess  Principal   Payments  used  for   Capital
Expenditures  in all prior  years, PROVIDED, that  in no event  shall the amount
included under this  clause (ii)  for any  Fiscal Year  exceed 50%  of the  Base
Capital Expenditure Allowance for the immediately succeeding Fiscal Year;

    (iii) (a) the excess of the actual cumulative net cash proceeds arising from
the sale of assets occurring after January 1, 1992 over the Projected Cumulative
Asset  Sale Proceeds (the "Excess Sale Proceeds") LESS (b) the cumulative amount
of such Excess Sale  Proceeds used for Capital  Expenditures and Investments  in
all  prior years, PROVIDED, that in no  event shall any amount be included under
this clause  (iii)  for any  Fiscal  Year  if the  actual  cumulative  principal
repayments of the Capitalized Interest Loans and the Bank Term Loans as a result
of mandatory amortization payments and cash flow sweep prepayments as of the end
of  the  immediately  preceding  Fiscal  Year  (but  including  any  cash  sweep
prepayment made on or before February 15th of the current Fiscal Year) does  not
exceed  the  Projected  Cumulative  Principal  Payments as  of  the  end  of the
immediately preceding Fiscal Year;

    (iv)  all  amounts  used  for  Capital  Expenditures  the  source  of  which
constitutes Project Financing;

    (v)  the cumulative amount  of the portion  of the Cash  Available for Sweep
which has been  retained by the  Company in  all prior Fiscal  Years (the  "Cash
Sweep Retention Amount") LESS the cumulative amount of such Cash Sweep Retention
Amount  used for Capital Expenditures and  other permitted purposes in all prior
years;

    (vi) the amount of Capital  Expenditures used for creating additional  plant
capacity,  PROVIDED, that (a) the aggregate  amount of such Capital Expenditures
under this clause (vi) for all Fiscal Years shall not exceed $30,000,000 and (b)
at least thirty  days prior to  making or  becoming committed to  make any  such
Capital  Expenditures,  the Corporation  has notified  the  Agents thereof  in a
writing which describes the additional  plant capacity and the business  purpose
therefor;

   (vii)  Capital Expenditures  for assets the  purchase price of  which is paid
with the Common Stock of the Company; and

   (viii) the aggregate amount of  the Base Capital Expenditures Allowances  for
all prior Fiscal Years which have not been used for Capital Expenditures.

    The  Credit  Agreement  Amendments  will  permit  the  Corporation  to  make
additional Strategic Capital Expenditures  in an aggregate  amount equal to  the
net  proceeds of the offering in excess  of $100,000,000 PLUS the Cash Available
for Sweep  with  respect  to  the  January 15,  1994  Test  Date  in  excess  of
$100,000,000.

    DEFINED  TERMS USED IN  FINANCIAL COVENANTS.  Capitalized  terms used in the
financial covenants in the  Credit Agreement shall have  the meanings set  forth
below  or,  if not  defined  below, the  meanings set  forth  in the  Old Credit
Agreement:

        "Adjusted Cumulative Net Worth"  of the Corporation, at  the end of  any
    quarter, shall mean the cumulative after tax net income (adjusted to exclude
    fresh start accounting) from January 1, 1995 through the end of such quarter
    PLUS  the aggregate net  cash proceeds received by  the Corporation from the
    issuance of equity securities after May 6, 1993.

                                       74
<PAGE>
        "Base Capital Expenditure  Allowance" for each  Fiscal Year, shall  mean
    the amount set forth below opposite such Fiscal Year:

<TABLE>
<S>                                                 <C>
1993..............................................  $33,900,000
1994..............................................   34,200,000
1995..............................................   39,300,000
1996..............................................   39,800,000
1997..............................................   51,900,000
1998..............................................   52,200,000
1999..............................................   52,200,000
</TABLE>

        "Consolidated  Current  Assets"  on  any  date,  shall  mean  the  total
    consolidated  assets  of   the  Corporation  and   its  Subsidiaries   (with
    inventories  being stated on a FIFO  basis) which may properly be classified
    as current assets in conformity with GAAP.

        "Consolidated Current Liabilities"  on any  date, shall  mean the  total
    consolidated  liabilities of the Corporation  and its Subsidiaries which may
    properly be classified as current  liabilities in conformity with GAAP,  not
    including  current maturities of long-term debt, but including any Revolving
    Loans which may, in accordance with GAAP, be considered long-term.

        "Coverage Period" means (i) with respect to the first fiscal quarter  of
    1995,  the three-month period ending on March 31, 1995, (ii) with respect to
    the second fiscal quarter of 1995,  the six-month period ending on June  30,
    1995, (iii) with respect to the third fiscal quarter of 1995, the nine-month
    period ending on September 30, 1995, and (iv) with respect to any succeeding
    fiscal  quarter,  the twelve-month  period ending  on the  last day  of such
    fiscal quarter.

        "Debt" at any time, shall mean, with respect to the Corporation and  its
    Subsidiaries  on  a  consolidated  basis, the  sum  of  (i)  the outstanding
    principal balance of the Revolving Loans at such time or any indebtedness at
    such time arising  from a  permitted revolving  credit facility  replacement
    thereof  (less the aggregate amount of cash  held by the Corporation and its
    consolidated Subsidiaries located in the  United States at such time),  (ii)
    the  aggregate amount of long-term indebtedness  at such time (including the
    current portions thereof),  (iii) the outstanding  amount of capital  leases
    (classified  as  such  according  to  GAAP)  shown  as  a  liability  on the
    Corporation's consolidated balance sheet at such time and (iv) the aggregate
    amount  of  all  Accommodation  Obligations  with  respect  to   third-party
    indebtedness  of the type described in clauses  (ii) and (iii) above at such
    time.

        "EBITDA" for any period, means the consolidated operating earnings  from
    continuing  operations  of  the  Corporation  and  its  subsidiaries  before
    interest, taxes,  depreciation,  amortization,  other  income  and  expense,
    minority  interests, the impact of fresh start accounting and other non-cash
    adjustments to income for such period.

        "Fixed Charge Coverage Ratio"  of the Corporation as  of the end of  any
    fiscal  quarter shall mean the  ratio of (a) EBITDA  for the 12-month period
    ending on  the last  day of  such fiscal  quarter, excluding  the impact  of
    non-cash  fresh start accounting adjustments for such 12-month period, MINUS
    actual Capital Expenditures during  such 12-month period (excluding  Capital
    Expenditures  under  clauses  (iv)  and  (vi)  of  the  Capital Expenditures
    covenant described above) to (b) the total net consolidated interest expense
    of the  Corporation  and  its  Subsidiaries  during  such  12-month  period,
    excluding  the impact of  non-cash amortizations resulting  from fresh start
    accounting  during  such  period  plus  the  aggregate  scheduled  principal
    payments  due (and  not previously  prepaid) on  senior indebtedness  of the
    Corporation and  its Subsidiaries  during  the 12-month  period  immediately
    succeeding the end of such fiscal quarter.

        "Leverage Ratio" of the Corporation on any date, shall mean the ratio of
    Debt to Total Capital on such date.

        "Projected Cumulative Principal Payments" means the following amounts as
    of  February 15 of each Fiscal  Year below of projected cumulative principal
    payments of (i) the Capitalized Interest

                                       75
<PAGE>
    Notes and the Bank Term Loans as a result of mandatory amortization payments
    and cash sweep prepayments and (ii)  any prepayments on or purchases of  the
    Corporation's  public debt securities having  maturities prior to January 1,
    1999 through such date:

<TABLE>
<CAPTION>
FEBRUARY 15 OF FISCAL YEAR                                CUMULATIVE PAYMENTS
- -------------------------------------------------------  ---------------------
<S>                                                      <C>
1994...................................................    $               0
1995...................................................           57,000,000
1996...................................................          133,000,000
1997...................................................          220,000,000
1998...................................................          332,000,000
1999...................................................          456,000,000
2000...................................................          579,000,000
</TABLE>

        "Projected Cumulative Asset Sale  Proceeds" means the following  amounts
    as  of  the end  of  each Fiscal  Year  below of  projected  cumulative cash
    proceeds arising from the sale of assets  PLUS for the Fiscal Year in  which
    the Libertyville facility is sold and each Fiscal Year thereafter, an amount
    equal  to the net cash  proceeds received from the  sale of the Libertyville
    facility:

<TABLE>
<CAPTION>
END OF FISCAL YEAR                                        CUMULATIVE PROCEEDS
- -------------------------------------------------------  ---------------------
<S>                                                      <C>
1992...................................................     $     7,000,000
1993...................................................          16,000,000
1994...................................................          21,000,000
1995...................................................          26,000,000
1996...................................................          31,000,000
1997...................................................          36,000,000
1998...................................................          41,000,000
1999...................................................          46,000,000
</TABLE>

        "Senior Interest Coverage  Ratio" of  the Corporation  for any  Coverage
    Period  shall mean the  ratio of (i)  EBITDA for such  period, excluding the
    impact of non-cash  fresh start  accounting adjustments for  such period  to
    (ii)  the  total net  consolidated interest  expense (excluding  interest on
    Subordinated Debt)  of  the Corporation  and  its Subsidiaries  during  such
    period,  excluding the impact of non-cash amortizations resulting from fresh
    start accounting during such period.

        "Total Capital" on any date, shall mean the sum of (i) Debt on such date
    and (ii) Adjusted Cumulative Net Worth on such date.

        "Total Interest  Coverage Ratio"  of the  Corporation for  any  Coverage
    Period  shall mean the  ratio of (i)  EBITDA for such  period, excluding the
    impact of non-cash  fresh start  accounting adjustments for  such period  to
    (ii)  the total net consolidated interest expense of the Corporation and its
    Subsidiaries  during  such   period,  excluding  the   impact  of   non-cash
    amortizations resulting from fresh start accounting during such period.

    DOMESTIC  NATURE  OF COVENANTS.   Each  of the  financial covenants  will be
calculated on  a  domestic  basis  only,  PROVIDED,  that,  if  at  anytime  the
Corporation's  non-domestic consolidated  revenues for a  Fiscal Year constitute
35% or more  of the  Corporation's total  consolidated revenues  for such  year,
then,  effective as of the first test  date in the immediately succeeding Fiscal
Year, such  financial covenants  shall be  calculated to  include the  financial
performance  of  the  Corporation  and  all  of  its  consolidated Subsidiaries,
PROVIDED further, that, if  such event occurs and  the Corporation so  requests,
the  Corporation, the Bank Group, the  Agents and the Administrative Agent shall
in good  faith recast  the  foregoing financial  covenants  to account  for  the
inclusion of the financial performance of the non-domestic Subsidiaries.

    CERTAIN  LIMITS ON COMPLIANCE WITH FINANCIAL COVENANTS.  No Event of Default
or Potential Event of  Default would be  deemed to exist  or be continuing  with
respect  to a  breach of  the Senior  Interest Coverage  Ratio and/or  the Total
Interest Coverage Ratio for any quarter during Fiscal Years 1995, 1996 and  1997
unless  there would also exist  a breach of the  Fixed Charge Coverage Ratio for
such quarter. Conversely,  no Event  of Default  or Potential  Event of  Default
would be deemed to exist or be continuing

                                       76
<PAGE>
with  respect to  a breach of  the Fixed  Charge Coverage Ratio  for any quarter
during fiscal years 1995, 1996 and 1997  unless there would also exist a  breach
of  either the  Senior Interest  Coverage Ratio  or the  Total Interest Coverage
Ratio for such quarter. No Event of Default or Potential Event of Default  would
be  deemed to  exist or  be continuing with  respect to  the financial covenants
described above unless either (i) such Event of Default shall be disclosed in or
determinable on the basis of the financial statements, compliance statements  or
officer's  certificates  delivered  to the  Bank  Group pursuant  to  the Credit
Agreement or (ii) the  Administrative Agent, at the  direction of the  Requisite
Senior  Lenders, shall have given written notice of such Event of Default to the
Corporation. All  calculations of  the foregoing  financial covenants  shall  be
rounded  to  the  nearest  1/100.  For  purposes  of  calculating  the foregoing
covenants, GAAP  shall  be  constant from  and  after  the date  of  the  Credit
Agreement,  unless the  Corporation and  the Requisite  Senior Lenders  agree to
modify such covenants to account for any subsequent changes to GAAP.

COLLATERAL

    Borrowings under  the Credit  Agreement are  all secured  by first  priority
security  interests in the capital stock  of certain Subsidiaries. Such security
interests were granted pursuant  to the Collateral  Trust Agreement and  related
Pledge  Agreements  which  provide that  the  collateral will  also  equally and
ratably  secure  certain  other  debt  of   the  Corporation  and  one  of   the
Subsidiaries,  including the Senior  2002 Notes. See  "Description of Other Debt
Obligations" and "Description of Collateral Trust Agreement."

AMENDED GUARANTEES

    The Corporation has guaranteed  all obligations of  USG Interiors under  the
Credit  Agreement. Each of  United States Gypsum  Company, USG Industries, Inc.,
USG Interiors,  Inc., USG  Foreign Investments,  Ltd., L&W  Supply  Corporation,
Westbank  Planting Company,  USG Interiors International,  Inc., American Metals
Corporation  and  La  Mirada  Products  Co.,  Inc.  (together,  the  "Subsidiary
Guarantors")   in  turn  has  guaranteed  pursuant  to  the  Amended  Subsidiary
Guarantees both the obligations  of the Corporation  under the Credit  Agreement
and  the Senior 2002 Notes and the obligations of USG Interiors under the Credit
Agreement. In connection  with the  1993 Amendments,  the Subsidiary  Guarantors
executed  the Amended Subsidiary Guarantees, which entitle the Senior 2002 Notes
to participate on a PARI PASSU basis  in the benefits of the Amended  Subsidiary
Guarantees.  The  Amended  Subsidiary  Guarantees  are  full  and  unconditional
guarantees of  prompt  payment  and  performance,  when  due,  of  all  (i)  the
Obligations  (as defined in  the Credit Agreement) of  the Borrowers (as defined
therein) and  (ii) all  obligations of  the Corporation  under the  Senior  2002
Notes. The Bank Group has the right to enforce the Amended Subsidiary Guarantees
and  seek collection thereunder (for  the ratable benefit of  the Bank Group and
holders of the Senior 2002 Notes) at any time when one or more Events of Default
have occurred and  are continuing under  the Credit Agreement  (which Events  of
Default  will include  the occurrence and  continuation of any  event of default
under the Senior 2002 Notes  Indenture). The Bank Group  will have the right  to
(i) determine whether, when and to what extent the Amended Subsidiary Guarantees
will  be enforced (provided that each  Amended Subsidiary Guarantee payment will
be  applied  to  the  Bank  Term  Loans,  Extended  Revolving  Credit  Facility,
Capitalized  Interest  Notes  and  Senior  2002  Notes  pro  rata  based  on the
respective principal  amounts owed  thereon)  and (ii)  amend or  eliminate  the
Amended  Subsidiary Guarantees; provided  that the pro  rata sharing requirement
contemplated in (i) above is not waivable (in the absence of a complete  release
of  the Amended Subsidiary Guarantees) without the  approval of the holders of a
majority in principal amount  of each of  the two series  of Senior 2002  Notes,
voting  separately. The  Amended Subsidiary  Guarantees will  terminate when the
Bank Term  Loans, the  Extended Revolving  Credit Facility  and the  Capitalized
Interest Notes are retired, regardless of whether any portion of the Senior 2002
Notes  then remains outstanding.  The liability of  each Subsidiary Guarantor on
its Amended Subsidiary Guarantee  is limited to  the greater of  (i) 95% of  the
lowest  amount, calculated as  of the date  of delivery of  the original Amended
Subsidiary Guarantee, sufficient  to render the  guarantor insolvent, leave  the
guarantor  with unreasonably small capital or  leave the guarantor unable to pay
its debts as they become due (each as defined under applicable law) and (ii) the
same amount  calculated  as  of the  date  any  demand for  payment  under  such
guarantee is made, in each case plus collection costs.

                                       77
<PAGE>
    See  "Index  To  Financial Statements  Significant  Accounting  Policies and
Practices" for condensed  consolidating financial statements  of the  Subsidiary
Guarantors and non-guarantors.

INTEREST

    The  Corporation may elect, subject to the availability of LIBOR pricing, to
have interest on the  Bank Term Loans and  Revolving Loans calculated either  at
reserve  adjusted LIBOR  plus 1 7/8%  or at  Citibank's Base Rate  plus 7/8% per
annum. An increase of 2% on all of the above interest rates would  automatically
take  place five  business days after  notice of  the occurrence of  an Event of
Default, and will  remain at such  increased level  for so long  as the  default
continues.  Interest is  calculated on  the basis of  the actual  number of days
elapsed in the  period during which  interest accrues  and a year  of 360  days.
Interest  is payable  as follows: (i)  for loans bearing  interest calculated by
reference to LIBOR, interest is payable on the last day of each interest period,
consisting of one, two, three or, when available, six month periods (interest is
also payable after  three months in  the latter  case); (ii) for  the Bank  Term
Loans bearing interest calculated by reference to Citibank's Base Rate, interest
is  payable on the  last day of  each calendar quarter;  and (iii) for Revolving
Loans bearing interest calculated by reference to Citibank's Base Rate, interest
is payable on the last day of each calendar month. The Corporation may  purchase
interest  rate  caps,  swaps,  collars  or  similar  devices  on  terms mutually
acceptable to the Corporation and the Agents.

VOLUNTARY PREPAYMENTS

    Voluntary  prepayments  of  the  Bank   Term  Loans,  Revolving  Loans   and
Capitalized  Interest Loans  may be made  upon two business  days' prior notice,
PROVIDED THAT  the  Bank Group  shall  be  indemnified for  any  breakage  costs
resulting from such voluntary prepayment.

MANDATORY PREPAYMENTS

    In  addition to  the excess cash  sweep described above,  the Corporation is
required to make mandatory prepayments on the Bank Term Loans as a result of the
issuance for cash of  new debt and  equity securities. Prior  to the payment  in
full  of all  outstanding senior  debt securities  having maturity  dates before
January 1, 1999  (other than  the Bank  Term Loans),  100% of  the net  proceeds
resulting  from the  issuance for  cash of new  debt and  equity securities (the
"Refinancing Proceeds") would be applied to the outstanding principal balance of
the Corporation's  Bank  Term Loans  and  senior  debt securities  in  order  of
maturity; PROVIDED that to the extent such Refinancing Proceeds are insufficient
to repay all of such Bank Term Loans and other senior debt securities due in any
given  calendar year, the amount of such Refinancing Proceeds available for such
year will be applied  pro rata to  the mandatory amortization  of the Bank  Term
Loans  and senior debt  securities due during  such year based  on the principal
amount of  Bank Term  Loans and  senior debt  securities due  during such  year.
Subject to the following sentence, following the payment in full of all existing
senior debt securities having maturity dates before January 1, 1999, 100% of the
Refinancing  Proceeds would be applied as follows: (i) first, to the outstanding
principal balance of the Bank Term Loans  in the order of maturity, but only  to
the  extent  that the  principal balance  of the  Bank Term  Loans has  not been
reduced by at least $300 million, and  (ii) second, to any of the  Corporation's
senior  debt  securities having  a final  maturity prior  to December  31, 2002,
including the  Bank  Term Loans  (to  scheduled  installments in  the  order  of
maturity), as determined by the Corporation in its discretion; provided that the
minimum amount of such Refinancing Proceeds applied to the Bank Term Loans under
this  clause (ii) shall be a percentage of such Refinancing Proceeds obtained by
dividing the outstanding principal balance of  the Bank Term Loans at such  time
by  the sum of such outstanding principal balance of the Bank Term Loans and the
outstanding principal balance  of the  Senior 2002 Notes  at such  time. In  the
event  that all  existing senior  debt securities  having maturity  dates before
January 1, 1999 have been paid in full, the outstanding principal balance of the
Bank Term Loans has been reduced by at least $300 million and the  Corporation's
senior  debt securities are rated at least  BB+ by Standard & Poor's Corporation
or Ba1 by Moody's  Investors Service, Inc., the  amount of Refinancing  Proceeds
subject  to the  immediately preceding  sentence shall  be reduced  from 100% to
66 2/3%,  with the  remaining 33  1/3% of  such Refinancing  Proceeds not  being
subject to the mandatory prepayment provisions.

                                       78
<PAGE>
    The  Credit Agreement Amendments (i) permit,  prior to the repayment in full
of all  existing senior  public debt  due before  1999, the  use by  USG of  any
Refinancing  Proceeds for  the prepayment, at  USG's option, of  any such public
debt and/or  Bank  Term  Loans  in  any order  of  maturity;  (ii)  require  the
application  of any such  Refinancing Proceeds within one  year of issuance; and
(iii) provide that USG may retain 33 1/3% of future Refinancing Proceeds if  all
existing senior public debt due before 1999 has been paid in full, the aggregate
outstanding  Bank Term Loans at such time does not exceed $148,000,000 and USG's
public senior debt is then  rated at least BB  by Standard & Poor's  Corporation
and Ba2 by Moody's Investors Service, Inc.

FEES

    Commitment  fees  on the  unused portion  of  the Extended  Revolving Credit
Facility accrue  at a  per  annum rate  of 3/8%  and  are payable  quarterly  in
arrears.  Commitment fees on the undrawn face  amount of all Facility Letters of
Credit accrue  at a  per annum  rate  of 1  1/2% and  are payable  quarterly  in
advance.

                     DESCRIPTION OF OTHER DEBT OBLIGATIONS

THE 1986 INDENTURE SECURITIES

    The  Senior 1996 Notes, the Senior 1997 Notes and the Senior 2017 Debentures
were issued  under  an  indenture  and  certain  related  instruments  delivered
thereunder  (collectively, the "1986  Indenture"), dated as  of October 1, 1986,
between the Corporation and the Harris  Trust and Savings Bank, as trustee  (the
"1986  Indenture Trustee"). As part of the Restructuring, the 1986 Indenture was
supplemented by resolutions adopted by the Board (the "Bond Board  Resolutions")
and  an officer's certificate  delivered in accordance  therewith to provide for
the Senior 1995 Notes  and the Senior  1998 Notes. In  connection with the  Note
Placement,  the  1986 Indenture  is  being supplemented  by  further resolutions
adopted by  the Board  (the  "1994 Bond  Board  Resolutions") and  an  officer's
certificate  delivered in  accordance therewith to  provide for  the Senior 2001
Notes. The Senior 1995 Notes, the Senior 1996 Notes, the Senior 1997 Notes,  the
Senior  1998 Notes,  the Senior  2001 Notes and  the Senior  2017 Debentures are
collectively referred to  herein as the  "1986 Indenture Securities."  Conformed
copies of the 1986 Indenture, the Bond Board Resolutions and the 1994 Bond Board
Resolution  have been  filed as exhibits  to the Registration  Statement and are
available  as  described  under  "Available  Information."  Whenever  particular
provisions  or  defined  terms of  the  1986  Indenture Securities  or  the 1986
Indenture, as supplemented by the Bond Board Resolutions and the 1994 Bond Board
Resolutions, are  referred  to, such  provisions  or defined  terms  are  deemed
incorporated  herein by  reference and  such statements  are qualified  in their
entirety by such reference. Initial capitalized  terms which are defined in  the
1986 Indenture are used herein as so defined.

    GENERAL

    The  Senior 1995 Notes are  a series of securities  which are limited to $75
million aggregate principal amount. The Senior  1995 Notes bear interest at  the
rate  of 8% per annum and will mature  on December 15, 1995. Interest is payable
semiannually on June 15 and  December 15 of each year,  to the persons in  whose
names  the Senior 1995 Notes are registered at the close of business on the next
preceding June 1 or December 1, as the case may be.

    The Senior 1996  Notes bear  interest at  8% per  annum and  will mature  on
December  15, 1996. Interest is payable semiannually  on June 15 and December 15
of each year to the persons in whose names the Senior 1996 Notes are  registered
at the close of business on the next preceding June 1 or December 1, as the case
may be.

    The Senior 1997 Notes bear interest at 8% per annum and will mature on March
15,  1997. Interest is payable semiannually on September 15 and March 15 of each
year to the persons in whose names  the Senior 1997 Notes are registered at  the
close  of business on the next preceding September 1 or March 1, as the case may
be.

                                       79
<PAGE>
    The  Senior 1998 Notes are  a series of securities  which are limited to $35
million aggregate principal amount. The Senior  1998 Notes bear interest at  the
rate  of 9% per annum and will mature  on December 15, 1998. Interest is payable
semi-annually on June 15 and  December 15 of each year  to the persons in  whose
names  the Senior 1998 Notes are registered at the close of business on the next
preceding June 1 or December 1, as the case may be.

    The Senior 2001 Notes are a series  of securities which are limited to  $150
million  aggregate principal amount. The Senior 2001 Notes will bear interest at
9 1/4% per annum and will mature on December 15, 2001. Interest will be  payable
semi-annually  on June 15 and December 15 of each year, beginning June 15, 1994,
to the persons in whose names the Senior 2001 Notes are registered at the  close
of business on the next preceding June 1 or December 1, as the case may be.

    The  Senior 2017 Debentures bear interest at 8.75% per annum and will mature
on March 1, 2017. Interest is payable semiannually on September 1 and March 1 of
each year  to  the  persons  in  whose names  the  Senior  2017  Debentures  are
registered  at the close of business on the next preceding August 15 or February
15, as the case may be.

    Principal (and premium, if any) and interest is payable, and the transfer of
the 1986 Indenture  Securities is registrable,  at the office  or agency of  the
Corporation  maintained  for  such purpose  in  the  City of  Chicago,  State of
Illinois, currently the Corporate  Trust Office of  the 1986 Indenture  Trustee,
Harris  Trust and Savings Bank, 311 West Monroe Street, Chicago, Illinois 60690;
provided, however, that payment  of interest may  be made at  the option of  the
Corporation  by check  or draft  mailed to the  person entitled  thereto as such
person's address appears in  the security register  maintained for such  purpose
pursuant  to the 1986 Indenture. No service charge will be made for any transfer
or exchange except the  Corporation may require payment  of a sum sufficient  to
cover any tax or other governmental charge payable in connection therewith.

    The  Senior  1995  Notes and  the  Senior  1998 Notes  are  issued  in fully
registered form  without  coupons and  in  denominations of  $250  and  integral
multiples  thereof. The  Senior 1996 Notes,  the Senior 1997  Notes, Senior 2001
Notes and the Senior 2017 Debentures are issued in fully registered form without
coupons and in denominations of $1,000 and integral multiples thereof.

    The 1986  Indenture  Securities rank  PARI  PASSU with  all  senior  secured
indebtedness of the Corporation.

    SECURITY

    The  1986  Indenture  Securities  are  secured  by  first  priority security
interests in capital stock of  certain Subsidiaries which were granted  pursuant
to  the Collateral Trust  Agreement and related  pledge and security agreements.
The Collateral Trust Agreement provides  that the collateral thereunder  equally
and  ratably  secures certain  other  debt of  the  Corporation and  one  of the
Subsidiaries, including the  Senior 2002  Notes and the  Bank Debt  Obligations.
Holders  of the  Bank Debt  Obligations primarily  control the  operation of the
Collateral Trust. See "Description of Collateral Trust."

    REDEMPTION

    The Senior 1995  Notes and  the Senior  1998 Notes  may be  redeemed by  the
Corporation in whole or in part at any time without penalty or premium.

    The  Senior 1996 Notes, the Senior 1997  Notes and the Senior 2001 Notes may
not be redeemed at the option of the Corporation prior to maturity.

                                       80
<PAGE>
    The Senior 2017 Debentures may be redeemed at the option of the  Corporation
in  whole or in part from time to time on at least 30 and not more than 90 days'
notice by mail to registered holders thereof at the following redemption  prices
(expressed in percentages of principal amount):

    If  redeemed during the  12-month period commencing  March 1 of  each of the
years indicated:

<TABLE>
<CAPTION>
             YEAR                PERCENTAGE                YEAR                PERCENTAGE
- ------------------------------  ------------  ------------------------------  ------------
<S>                             <C>           <C>                             <C>
1993..........................     105.974%   2000..........................     102.987%
1994..........................     105.547    2001..........................     102.560
1995..........................     105.120    2002..........................     102.134
1995..........................     104.694    2003..........................     101.707
1997..........................     104.267    2004..........................     101.280
1998..........................     103.840    2005..........................     100.853
1999..........................     103.414    2006..........................     100.427
</TABLE>

and thereafter at 100%  of the principal amount  thereof, in each case  together
with accrued and unpaid interest to the date fixed for redemption.

    Notwithstanding the foregoing provisions, the Corporation may not redeem any
of  the Senior 2017 Debentures  prior to March 1,  1997, directly or indirectly,
from or  in  anticipation of  moneys  borrowed by  or  for the  account  of  the
Corporation  or any of its  Subsidiaries at an interest  cost of less than 8.77%
per annum, except for Senior 2017 Debentures redeemed pursuant to the provisions
described below under "Sinking Fund."

    SINKING FUND

    As a mandatory sinking fund for the Senior 2017 Debentures, the  Corporation
will pay to the 1986 Indenture Trustee before March 1, in each of the years 1998
to  2016, inclusive, an amount in cash sufficient to redeem, at the Sinking Fund
Redemption Price,  $10,000,000 aggregate  principal amount  of the  Senior  2017
Debentures. At its option, the Corporation may pay to the 1986 Indenture Trustee
before  each mandatory  sinking fund payment  date an additional  amount in cash
sufficient to redeem at  the Sinking Fund Redemption  Price up to an  additional
$15,000,000  aggregate principal amount of the Senior 2017 Debentures. The right
to make such optional sinking fund payments is not cumulative, but any  optional
sinking  fund  payment  may be  used  to  reduce the  amount  of  any subsequent
mandatory sinking  fund payment.  The  Corporation may,  at its  option,  credit
against  mandatory sinking  fund payments  the principal  amount of  Senior 2017
Debentures acquired  or  redeemed  other  than  through  the  operation  of  the
mandatory  sinking  fund, provided  that such  Senior  2017 Debentures  have not
theretofore been used  for any such  credit or delivered  to the 1986  Indenture
Trustee   for  cancellation  in  connection  with  certain  sale  and  leaseback
transactions as  described  below  under "Limitation  Upon  Sale  and  Leaseback
Transactions."

    RESTRICTED AND UNRESTRICTED SUBSIDIARIES

    The various restrictive provisions of the 1986 Indenture, as supplemented by
the  Bond  Board Resolutions  and the  1994  Bond Board  Resolutions, summarized
below, while applicable to the  Corporation and its Restricted Subsidiaries,  do
not  apply to  Unrestricted Subsidiaries. A  "Subsidiary" is  any corporation, a
majority of  the  Voting  Stock of  which  is  at the  time  owned  directly  or
indirectly  by the  Corporation and its  other Subsidiaries.  "Voting Stock," as
applied to the stock of any corporation, is stock of any class or classes having
ordinary voting power for the  election of a majority  of the directors of  such
corporation,  other than stock having such power only by reason of the happening
of a contingency.  A "Restricted Subsidiary"  is any Subsidiary  which owns  any
Principal  Operating Property.  "Principal Operating Property"  is any principal
manufacturing  plant,  or  distribution   or  research  facility,  and   related
facilities  located  in  the  United  States  and  owned  and  operated  by  the
Corporation or any Subsidiary for more than 90 days, other than (i) any facility
acquired for the control or abatement of atmospheric pollutants or contaminants,
water pollution,  noise, odor  or other  pollution or  (ii) any  plant or  other
facility

                                       81
<PAGE>
which,  in  the opinion  of  the Board,  is not  of  material importance  to the
business of the Corporation and its Restricted Subsidiaries taken as a whole. An
"Unrestricted Subsidiary" is any Subsidiary other than a Restricted Subsidiary.

    RESTRICTIONS ON MERGER

    So long as any  1986 Indenture Securities  are outstanding, the  Corporation
may not consolidate with or merge into any other corporation or sell or transfer
all  or substantially all of its properties  and assets to another Person unless
(i) the successor is a corporation organized and existing under the laws of  the
United  States of America or  a state thereof and  expressly assumes the due and
punctual payment of the  principal of (and premium,  if any), interest, if  any,
and  Additional Amounts, if  any, on all  the 1986 Indenture  Securities and any
coupons and the due and punctual performance and observance of all covenants and
conditions of the Corporation in the 1986 Indenture, as supplemented by the Bond
Board Resolutions, and  (ii) such successor  corporation shall not,  immediately
after such merger or consolidation, or such sale or conveyance, be in default in
the  performance  of  any  covenant  or  condition  of  the  1986  Indenture, as
supplemented by the Bond Board Resolutions.

    LIMITATION UPON SECURED DEBT OF THE CORPORATION AND ITS RESTRICTED
SUBSIDIARIES

    So long as any  1986 Indenture Securities  are outstanding, the  Corporation
will not itself, and will not permit any Restricted Subsidiary to, incur, issue,
assume,  guarantee  or  suffer  to exist  any  indebtedness  for  money borrowed
("Debt") secured by a mortgage,  pledge, lien or security interest  ("Mortgage")
on  any Principal Operating  Property or on any  shares of stock  or Debt of any
Restricted Subsidiary, without  effectively providing that  such 1986  Indenture
Securities  (together with, if the Corporation  so determines, any other Debt of
the Corporation  or  such  Restricted Subsidiary  then  existing  or  thereafter
created  which is  not subordinated Debt)  shall be secured  equally and ratably
with (or, at the Corporation's  option, prior to) such  secured Debt so long  as
such  secured Debt shall be so secured,  unless the aggregate amount of all such
secured Debt, together  with all Attributable  Debt of the  Corporation and  its
Restricted  Subsidiaries in respect of sale and leaseback transactions involving
Principal Operating  Properties  (other than  those  exempt under  clauses  (ii)
through  (iv) under  "Limitation Upon  Sale and  Leaseback Transactions" below),
would not  exceed 5%  of  Consolidated Net  Tangible Assets.  "Consolidated  Net
Tangible  Assets" means the  Corporation's aggregate amount  of assets minus (a)
all liabilities  except (i)  indebtedness  for money  borrowed maturing  on,  or
extendable  at the option of the obligor to,  a date more than one year from the
date  of  determination   thereof,  (ii)   deferred  income   taxes  and   (iii)
stockholders'  equity and  (b) all  goodwill, trade  names, trademarks, patents,
unamortized  debt  discount  and  expense  and  other  like  intangibles.   This
restriction  does not apply to, and there  will be excluded from secured Debt in
any computation  under  such  restriction,  Debt secured  by  (i)  Mortgages  on
property  of, or on any shares of stock  or Debt of, any corporation existing at
the time such  corporation becomes  a Restricted Subsidiary;  (ii) Mortgages  in
favor of the Corporation or a Restricted Subsidiary; (iii) Mortgages in favor of
governmental  bodies to secure  progress, advance or  other payments pursuant to
any contract or provision of any statute; (iv) certain Mortgages created (A)  in
the  ordinary course of  business, (B) in connection  with taxes, assessments or
other governmental  charges or  (C) in  connection with  legal proceedings;  (v)
Mortgages  on property  (including leasehold estates),  shares of  stock or Debt
existing at  the  time of  acquisition  thereof (including  acquisition  through
merger  or consolidation); (vi) purchase  money and construction Mortgages which
are entered into within specified time limits; and (vii) any extension, renewal,
replacement or refunding of  any Mortgage referred to  in the foregoing  clauses
(i)  through (vi), inclusive. "Attributable Debt"  is defined in general to mean
the total net amount of  rent required to be paid  during the remaining term  of
any  lease, discounted at  a rate per  annum equal to  one-fourth of one percent
over the  rate per  annum  borne by  the  applicable 1986  Indenture  Securities
(except  that  for 1998  Senior  Notes such  rate  shall be  8  1/4%) compounded
semi-annually.

                                       82
<PAGE>
    LIMITATION UPON SALE AND LEASEBACK TRANSACTIONS

    So long as any of the  following 1986 Indenture Securities are  outstanding,
the  Corporation will not itself, and  will not permit any Restricted Subsidiary
to, sell or transfer any Principal Operating Property owned as of the  following
dates  with the intention of taking back  a lease thereof (a "sale and leaseback
transaction"):

<TABLE>
<S>                                      <C>
Senior 1995 Notes......................  December 15, 1986
Senior 1996 Notes......................  December 15, 1986
Senior 1997 Notes......................  March 15, 1987
Senior 1998 Notes......................  December 15, 1986
Senior 2017 Debentures.................  March 1, 1987
</TABLE>

This restriction does not  apply to any sale  and leaseback transaction if:  (i)
the  Corporation  or such  Restricted Subsidiary  could mortgage  such Principal
Operating Property  under  the restrictions  set  forth under  "Limitation  Upon
Secured  Debt of  the Corporation and  its Restricted Subsidiaries"  above in an
amount equal to the  Attributable Debt with respect  to such sale and  leaseback
transaction  without equally and ratably securing the 1986 Indenture Securities;
(ii) within 120 days after the sale or transfer is completed, the Corporation or
a Restricted Subsidiary applies to the  retirement of Senior Funded Debt of  the
Corporation  or Funded Debt  of a Restricted  Subsidiary an amount  equal to the
greater of (A) the net proceeds of the sale of the Principal Operating  Property
leased  or (B) the fair market value of the Principal Operating Property leased;
(iii) the  lease  in  such sale  and  leaseback  transaction is  for  a  period,
including  renewals, of no  more than three  years; or (iv)  such arrangement is
between the  Corporation  and  a Restricted  Subsidiary  or  between  Restricted
Subsidiaries.

    EVENTS OF DEFAULT

    The  following  will  be Events  of  Default  under the  1986  Indenture, as
supplemented by the Bond  Board Resolutions: (i) default  in the payment of  any
principal or premium, if any, on the 1986 Indenture Securities; (ii) default for
30  days  in the  payment  of any  interest or  Additional  Amounts on  the 1986
Indenture Securities; (iii) default for 90 days after written notice thereof  in
the   performance  of  any  other  covenant   applicable  to  such  Notes;  (iv)
acceleration of  the maturity  of any  indebtedness of  the Corporation  or  any
Subsidiary  in excess of $50  million principal amount in  the aggregate if such
acceleration results from a  default under the instruments  giving rise to  such
indebtedness  and is not  annulled within 10  days after written  notice of such
default; or (v) certain events  of bankruptcy, insolvency or reorganization.  No
Event  of Default with respect to a particular series of securities issued under
the 1986 Indenture, as supplemented  by the Bond Board Resolutions,  necessarily
constitutes  an Event of Default with respect  to any other series of securities
issued thereunder. In case an Event of  Default (other than an Event of  Default
under  clause (v)) shall occur and be continuing with respect to any series, the
1986 Indenture  Trustee  or  the holders  of  not  less than  25%  in  aggregate
principal  amount of all series of  securities affected thereby then outstanding
under the 1986 Indenture, as supplemented by the Bond Board Resolutions, (voting
as one class) by notice to the Corporation may declare the principal (or, in the
case of discounted  securities, the amount  specified in the  terms thereof)  of
such series to be due and payable immediately. In case an Event of Default under
clause  (v) shall  occur and  be continuing, the  1986 Indenture  Trustee or the
holders of not  less than 25%  in aggregate principal  amount of all  securities
then  outstanding under  the 1986 Indenture,  as supplemented by  the Bond Board
Resolutions, (voting as one class) by  notice may declare the principal (or,  in
the case of discounted securities, the amount specified in the terms thereof) of
all  such outstanding securities to be due and payable immediately. Any Event of
Default with respect to a particular series of securities issued under the  1986
Indenture,  as supplemented by the Bond Board  Resolutions, may be waived, and a
declaration of acceleration rescinded, by the holders of a majority in aggregate
principal amount of the  outstanding securities of such  series (or if all  such
outstanding  securities, as the case may be), except in a case of failure to pay
principal or premium, if  any, or interest or  Additional Amounts in respect  of
such  security  for  which payment  had  not  been subsequently  made.  The 1986
Indenture, as supplemented by the Bond Board

                                       83
<PAGE>
Resolutions, provides that the 1986 Indenture Trustee may withhold notice to the
securityholders of any default (except in payment of principal, premium, if any,
or interest or Additional Amounts) if it determines in good faith that it is  in
the interest of the securityholders to do so.

    Subject to the provisions of the 1986 Indenture, as supplemented by the Bond
Board  Resolutions, relating to the duties of the 1986 Indenture Trustee in case
an Event of Default occurs and is continuing, the 1986 Indenture Trustee will be
under no obligation  to exercise  any of  its rights  or powers  under the  1986
Indenture,  as supplemented by the Bond Board Resolutions, at the request, order
or direction of  any of  the securityholders, unless  such securityholders  have
offered  to the  1986 Indenture  Trustee reasonable  indemnity. Subject  to such
provisions for the indemnification of the 1986 Indenture Trustee and to  certain
other  limitations, the holders  of a majority in  aggregate principal amount of
the securities  of  all  series affected  (voting  as  one class)  at  the  time
outstanding  have the right to  direct the time, method  and place of conducting
any proceeding  for any  remedy  available to  the  1986 Indenture  Trustee,  or
exercising any trust or power conferred on the 1986 Indenture Trustee.

    The Corporation is required to file with the 1986 Indenture Trustee annually
an  officers' certificate as to the absence  of certain defaults under the terms
of the 1986 Indenture, as supplemented by the Bond Board Resolutions.

    DEFEASANCE

    The Corporation, at  its option,  (i) will be  discharged from  any and  all
obligations  in respect of  any series of the  1986 Indenture Securities (except
for certain  obligations to  register  the transfer  or  exchange of  such  1986
Indenture  Securities, replace  such stolen,  lost, destroyed  or mutilated 1986
Indenture Securities, maintain paying  agencies and hold  moneys for payment  in
trust) or (ii) will not be under any obligation to comply with certain covenants
and  provisions applicable  to such  1986 Indenture  Securities, including those
described above  under "Limitation  Upon  Secured Debt  of the  Corporation  and
Restricted  Subsidiaries" and "Limitation Upon Sale and Leaseback Transactions,"
if the Corporation (i) irrevocably deposits with the 1986 Indenture Trustee,  in
trust  for  the holders  of such  1986  Indenture Securities,  (A) money  or (B)
noncallable obligations  issued or  fully  guaranteed by  the United  States  of
America  which through the payment of  interest and income thereon and principal
thereof will provide money, in each case in an amount sufficient to pay all  the
principal  of  (and  premium,  if  any)  and  interest  on  such  1986 Indenture
Securities on the dates such  payments are due in  accordance with the terms  of
such 1986 Indenture Securities and (ii) shall have paid or caused to be paid all
other  sums payable with respect to  such 1986 Indenture Securities. To exercise
either of the options described above, the Corporation is required, among  other
things,  to  deliver to  the  1986 Indenture  Trustee  an opinion  of nationally
recognized tax  counsel  to the  effect  that  holders of  such  1986  Indenture
Securities  will  not recognize  income,  gain or  loss  for federal  income tax
purposes as  a result  of such  deposit and  discharge and  will be  subject  to
federal  income tax in  the same amount and  in the same manner  and at the same
times as  would  have been  the  case if  such  deposit and  discharge  had  not
occurred, and an officer's certificate and opinion of counsel to the effect that
all  conditions precedent relating to such  deposit and discharge under the 1986
Indenture, as supplemented  by the  Bond Board Resolutions,  have been  complied
with,  and that such deposit  and discharge will not  cause any violation of the
Investment Company Act of 1940, as amended, on the part of the Corporation,  the
trust, the trust funds representing such deposit or the 1986 Indenture Trustee.

    MODIFICATION OF THE INDENTURE

    The  1986 Indenture, as supplemented by the Bond Board Resolutions, contains
provisions permitting the Corporation and  the 1986 Indenture Trustee to  modify
or  otherwise  amend  the 1986  Indenture,  as  supplemented by  the  Bond Board
Resolutions, or any supplemental indenture thereto or the rights of the  holders
of the securities issued thereunder, with the consent of the holders of not less
than  a majority in principal amount of the securities of all series at the time
outstanding under  such  1986  Indenture,  as supplemented  by  the  Bond  Board
Resolutions, which are affected by such modification or amendment (voting as one
class);  provided that  no such modification  or amendment shall  (i) change the
fixed maturity of  any securities, or  reduce the principal  amount thereof,  or
premium, if any, or reduce the rate

                                       84
<PAGE>
or  extend the  time of  payment of interest  or Additional  Amounts thereon, or
reduce the amount due and payable upon the acceleration of the maturity  thereof
or  the amount provable  in bankruptcy, or  make the principal  of, or interest,
premium or Additional Amounts on, any  security payable in any coin or  currency
other  than that provided in  such security; (ii) impair  the right to institute
suit for the enforcement  of any such  payment on or  after the stated  maturity
thereof;  or  (iii)  reduce  the aforesaid  percentage  in  principal  amount of
securities, the  consent  of the  holders  of which  is  required for  any  such
modification  or amendment,  or the percentage  required for the  consent of the
holders to waive defaults, without the consent of the holder of each security so
affected.

THE SENIOR 2002 NOTES

    The Senior 2002 Notes are issued under two indentures (the "Senior 2002 Note
Indentures") among the Corporation, the  Subsidiary Guarantors and State  Street
Bank  and Trust Company (the "Senior 2002  Note Trustee"), as trustee. The forms
of the  Senior  2002  Note  Indentures  have  been  filed  as  exhibits  to  the
Registration   Statement  and  are  available   as  described  under  "Available
Information." Whenever particular provisions or defined terms of the Senior 2002
Note Indentures are  referred to, such  provisions or defined  terms are  deemed
incorporated  herein  by reference.  Capitalized  terms used  but  not otherwise
defined in this summary have the meanings given to such terms in the Senior 2002
Note Indentures.

    GENERAL

    The Senior  2002  Notes are  limited  to $478  million  aggregate  principal
amount.  The Senior  2002 Notes  bear interest at  a rate  of 10  1/4% per annum
(computed on the basis of a 360-day year consisting of twelve 30-day months) and
will mature on December  15, 2002. Interest is  payable semiannually on June  15
and  December  15, to  the  persons in  whose names  the  Senior 2002  Notes are
registered at the close of business on the next preceding June 1 or December  1,
as the case may be.

    The  Senior 2002 Notes rank PARI  PASSU with all senior secured indebtedness
of the Corporation.

    Principal and interest are payable, and the transfer of Senior 2002 Notes is
registrable, at the  office or  agency of  the Corporation  maintained for  such
purpose  in  the City  of Chicago,  State of  Illinois; provided,  however, that
payment of interest may  be made at  the option of the  Corporation by check  or
draft  mailed  to the  person entitled  thereto  as it  appears in  the security
register  maintained  for  such  purpose  pursuant  to  the  Senior  2002   Note
Indentures.

    The  Senior 2002 Notes  are issued in fully  registered form without coupons
and in denominations of $1,000 and integral multiples thereof. No service charge
will be made  for any transfer  or exchange except  the Corporation may  require
payment  of  a sum  sufficient to  cover  any tax  or other  governmental charge
payable in connection therewith.

    SECURITY

    The Senior 2002 Notes  are secured by first  priority security interests  in
the  capital  stock of  certain Subsidiaries  pursuant  to the  Collateral Trust
Agreement and  related pledge  and security  agreements which  provide that  the
security  interests  equally  and  ratably  secure  certain  other  debt  of the
Corporation and  certain  of  the Subsidiaries,  including  the  1986  Indenture
Securities  and the Bank Debt Obligations. The Bank Group will primarily control
the operation of the Collateral Trust Agreement. See "Description of  Collateral
Trust."

    SUBSIDIARY GUARANTEES

    Pursuant   to  contingent   payment  guarantees   (the  "Contingent  Payment
Guarantees"), holders of the Senior 2002 Notes are entitled to participate on  a
PARI  PASSU basis in any collections made  by the Bank Group from the Subsidiary
Guarantors pursuant to  the Subsidiary Guarantees  of the Bank  Term Loans,  the
Extended  Revolving  Credit Facility,  the  Capitalized Interest  Notes  and the
Senior 2002  Notes. The  provisions in  the Senior  2002 Note  Indentures  which
provide for the Contingent Payment Guarantees confirm (but do not expand upon or
add  to)  the  obligation  of the  Subsidiary  Guarantors  under  the Subsidiary
Guarantees and the right of the holders of the Senior 2002 Notes to  participate
in any

                                       85
<PAGE>
payments  thereunder. However,  the Bank  Group has  the exclusive  right to (i)
determine whether, when  and to what  extent the Subsidiary  Guarantees will  be
enforced  (provided that each guarantee payment will be applied to the Bank Term
Loans, Extended Revolving Credit Facility, Capitalized Interest Notes and Senior
2002 Notes pro rata based on the respective amounts owed thereon) and (ii) amend
or eliminate  the Subsidiary  Guarantees;  provided that  the pro  rata  sharing
requirement  contemplated in  (i) above  is not  waivable (in  the absence  of a
complete release  of the  Subsidiary  Guarantees) without  the approval  of  the
holders  of  a  majority in  principal  amount  of the  Senior  2002  Notes then
outstanding. In  addition,  each  Subsidiary  Guarantor's  liability  under  its
guarantee  is limited to the greater of (i) 95% of the lowest amount, calculated
as of the date of delivery  of the original Subsidiary Guarantee, sufficient  to
render  the  guarantor insolvent,  leave the  guarantor with  unreasonably small
capital or leave the guarantor unable to pay its debts as they become due  (each
as  defined under applicable law) and (ii)  the same amount calculated as of the
date any demand for payment is made, in each case plus collection costs. Holders
of the  Senior  2002  Notes  are  entitled  to  enforce  the  pro  rata  sharing
requirement  described above  in the  event that the  Bank Group  fails to share
proceeds collected under the Subsidiary Guarantees in accordance with the  terms
thereof.  The Subsidiary Guarantees will terminate  when the Bank Term Loan, the
Extended Revolving  Credit  Facility  and the  Capitalized  Interest  Notes  are
retired, regardless of whether any portion of the Senior 2002 Notes then remains
outstanding. See "Description of Credit Agreement -- Guarantees."

    REDEMPTION

    Subject  to  certain  limitations  contained in  the  Credit  Agreement, the
Corporation may, at its  option, redeem the  Senior 2002 Notes  in whole at  any
time  or in  part (in integral  multiples of $1,000)  from time to  time, at the
following redemption prices (expressed as a percentage of principal amount) plus
accrued interest to the redemption date:

<TABLE>
<CAPTION>
                                  REDEMPTION DATE                                       REDEMPTION PRICE
- ------------------------------------------------------------------------------------  ---------------------
<S>                                                                                   <C>
At any time through and including May 6, 1994.......................................             103%
At any time between May 6, 1994 and May 6, 1995.....................................             102%
At any time between May 6, 1995 and May 6, 1996.....................................             101%
On the day next following May 6, 1996...............................................             100%
</TABLE>

    In addition, the Senior 2002 Notes  are subject to mandatory redemption,  to
the  extent of  any and  all payments (together  with earnings  thereon, if any)
received by the  Senior 2002  Note Trustee  pursuant to  the Contingent  Payment
Guarantees  referred to above or by  the Collateral Trustee under the Collateral
Trust Agreement, at a redemption price equal to 100% of the principal amount  of
the  Senior 2002  Notes redeemed  plus accrued interest  thereon to  the date of
redemption.

    CERTAIN COVENANTS OF THE CORPORATION AND ITS RESTRICTED SUBSIDIARIES

    Each of the Senior 2002  Note Indentures contains certain covenants  binding
upon  the  Corporation  and  its Restricted  Subsidiaries  which  include, among
others, the negative covenants described below. These covenants do not apply  to
Unrestricted  Subsidiaries. See "The 1986 Indenture Securities -- Restricted and
Unrestricted  Subsidiaries"  above  for   the  definitions  of  Restricted   and
Unrestricted Securities.

    Limitation Upon Debt of the Corporation and its Restricted Subsidiaries

    So  long as any  Senior 2002 Notes are  outstanding, neither the Corporation
nor any Restricted Subsidiary shall issue, assume, guarantee, incur or otherwise
become liable  for (collectively  "issue"), directly  or indirectly,  any  Debt,
unless  the Interest  Coverage Ratio  for the  four consecutive  fiscal quarters
(treated as one accounting period) immediately preceding, and ending at least 30
days prior to, the issuance of such  Debt (as shown by a pro forma  consolidated
income  statement  of the  Corporation and  its  Domestic Subsidiaries  for such
period after giving effect to (i) the issuance of such Debt and, if  applicable,
the  application of the net proceeds thereof to refinance other Debt, as if such
Debt was issued and proceeds  applied at the beginning  of the period; (ii)  the
issuance  and retirement of any other Debt since the last day of the most recent
fiscal   quarter   covered    by   such    income   statement    as   if    such

                                       86
<PAGE>
Debt  was issued  or retired at  the beginning  of the period;  and (iii) within
certain limits,  the acquisition  of any  company or  business acquired  by  the
Corporation  since the first day of  the period, including any acquisition which
will be consummated contemporaneously with the issuance of such Debt, as if such
acquisition occurred at the beginning of the period and without giving effect to
any adjustments to the historical book  value of acquired assets or  liabilities
required  or permitted by generally  accepted accounting principles) exceeds the
following ratios for Debt  issued in the respective  periods indicated: (a)  the
period  through December  31, 1996,  1.50; (b) the  period from  January 1, 1997
through December 31, 1998,  1.75; and (c) from  January 1, 1999 and  thereafter,
2.00.  The  preceding  restrictions will  not  prohibit the  Corporation  or any
Restricted Subsidiary from issuing the following Debt: (i) Debt issued  pursuant
to  the  Credit  Agreement;  provided that  (A)  amounts  outstanding (including
outstanding Facility  Letters of  Credit) under  the Extended  Revolving  Credit
Facility shall not exceed $175 million at any time, and (B) the Bank Term Loans,
once  repaid or prepaid, in whole or in  part, shall not again be incurred under
this restriction, except for  extensions, renewals, substitutions,  refinancings
and  replacements as permitted under clause (xi) below; (ii) Debt outstanding on
the Effective Date;  provided that  any such Debt,  once repaid  or prepaid,  in
whole or in part, shall not again be incurred under this restriction, except for
extensions,  renewals, substitutions, refinancings and replacements as permitted
under clause (xi) below; (iii) Debt under the Senior 2002 Notes; (iv) so long as
any Debt remains outstanding under the Credit Agreement, Debt of the Corporation
to any Restricted Subsidiary; provided that (a) the maker of any loan  resulting
in  the incurrence of such Debt shall not be insolvent at the time such loan was
made or rendered insolvent as a result of the making of such loan, (b) such loan
was in compliance with applicable law and (c) such loan shall be subordinate  in
right of payment to the repayment in full of the Senior 2002 Notes following the
acceleration  of the Senior 2002 Notes; (v) Debt of any Restricted Subsidiary to
the Corporation  or  any other  Restricted  Subsidiary; (vi)  Debt  relating  to
letters  of credit  (other than  Debt permitted by  clauses (i)  and (ii) above)
issued for the  account of the  Corporation or any  Restricted Subsidiary in  an
aggregate  amount not to exceed $2.5  million; (vii) Debt incurred in connection
with deferred compensation  arrangements for employees  and former employees  of
the  Corporation and  its Subsidiaries  entered into  in the  ordinary course of
business; (viii) Debt of the Corporation  or any of its Restricted  Subsidiaries
which  constitutes Project Financing; (ix) Capital Lease Obligations (other than
Debt permitted by clause  (ii) above) having an  aggregate amount not  exceeding
$70  million; (x) Debt  (other than Debt  permitted by clauses  (i) through (ix)
above) in  an aggregate  principal amount  at any  one time  outstanding not  to
exceed  (a) $100  million, during the  period when any  Debt remains outstanding
under the Credit Agreement or any extension or renewal thereof or any successive
extension or renewal thereof, and (b)  $50 million, at any time thereafter;  and
(xi)  Debt  issued  in  connection with  any  extension,  renewal, substitution,
refinancing or  replacement of  Debt  permitted under  clauses (i)  through  (x)
above,  or  any  successive  extension,  renewal,  substitution,  refinancing or
replacement thereof; provided, that (a) the reincurrence of any such Debt  after
repayment  or prepayment of  such Debt shall  remain subject to  the provisos in
clauses (i) or (ii) above, as applicable, (b) the principal amount of such newly
issued Debt shall not be greater than the aggregate principal amount of the Debt
being extended, renewed, substituted, refinanced or replaced thereby and (c)  no
such  Debt shall  be issued  containing any recourse  to the  Corporation or its
Subsidiaries additional to  the recourse  of the Debt  being extended,  renewed,
substituted,  refinanced  or replaced  thereby.  For purposes  of  the foregoing
covenant, the term "Debt" means, as applied to any Person, without  duplication,
(i) all indebtedness of such Person for borrowed money, (ii) all indebtedness of
such  Person evidenced by notes, debentures, bonds or other similar instruments,
(iii) all reimbursement obligations  of such Person with  respect to letters  of
credit  issued for such Person's account (other than obligations with respect to
letters of credit securing  obligations entered into in  the ordinary course  of
business  of such Person  to the extent  not drawn on  or, if and  to the extent
drawn on, such drawing is reimbursed  promptly following receipt by such  Person
of  a demand for reimbursement following payment  on the letter of credit), (iv)
all obligations of such Person to pay the deferred purchase price of property or
services (but  excluding  trade  accounts  payable in  the  ordinary  course  of
business),   (v)  all  Capital  Lease  Obligations  of  such  Person,  (vi)  all
obligations of the type referred to in clauses (i) through (v) of other  Persons
for  the  payment of  which such  Person  is responsible  or liable  as obligor,
guarantor or otherwise,  and (vii) all  obligations of the  type referred to  in
clauses  (i) through (v) of other Persons secured by any Lien on any property or
asset of

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such Person (whether or not such obligation is assumed by such Person); and  the
term  "Interest Coverage Ratio" means, with respect  to any period, the ratio of
(a) the Corporation's Consolidated Domestic EBITDA (which is defined to  exclude
the impact of fresh start accounting principles) for such period, minus Domestic
Capital  Expenditures during such period, to (b) the Total Domestic Consolidated
Interest Expense during such period.

    Limitation on Restricted Payments

    So long as any Senior 2002  Notes are outstanding, the Corporation will  not
(i) declare or pay any dividend or make any distribution on any capital stock of
the Corporation (other than dividends or distributions payable solely in capital
stock  of the Corporation (excluding preferred stock redeemable at the option of
the holder prior to the first anniversary  of the stated maturity of the  Senior
2002  Notes ("Redeemable Preferred")) or rights  to acquire capital stock (other
than Redeemable  Preferred) of  the Corporation  or, as  part of  a  shareholder
rights  plan, rights to acquire capital  stock (other than Redeemable Preferred)
of another Person)  or (ii) purchase,  redeem, retire or  otherwise acquire,  or
permit  any Subsidiary  to purchase,  redeem, retire  or otherwise  acquire, for
value, any capital  stock of  the Corporation or  any option,  warrant or  other
right   to  acquire  capital  stock  of  the  Corporation  (any  such  dividend,
distribution,  purchase,  redemption,  retirement  or  other  acquisition  being
hereinafter  referred  to  as  a  "Restricted  Payment"),  if  at  the  time the
Corporation or such  Subsidiary makes such  Restricted Payment (a)  an Event  of
Default  shall have occurred and be  continuing (or would result therefrom); (b)
the Corporation could not or, after giving effect thereto, would not be able  to
incur  an additional $1.00  of Debt under  the restrictions set  forth under the
heading  "Limitation  Upon   Debt  of   the  Corporation   and  its   Restricted
Subsidiaries";  or (c) the  aggregate amount of such  Restricted Payment and all
other Restricted Payments made  since the Effective Date,  would exceed the  sum
of: (1) $10 million; plus (2) 25% of the Corporation's Domestic Consolidated Net
Income  (which  is  defined to  exclude  the  impact of  fresh  start accounting
adjustments) accrued during the period  (treated as one accounting period)  from
January 1, 1995 to December 31, 1996 (or, in case such Domestic Consolidated Net
Income  shall be  a deficit, minus  100% of such  deficit); plus (3)  50% of the
Corporation's  Domestic  Consolidated  Net  Income  accrued  during  the  period
(treated as one accounting period) on or after January 1, 1997 (or, in case such
Domestic  Consolidated  Net  Income  shall  be a  deficit,  minus  100%  of such
deficit); plus (4) the aggregate net  cash proceeds received by the  Corporation
from  the  issuance, sale  or  other disposition  (other  than to  a Subsidiary)
subsequent to the  Effective Date of  capital stock (or  any option, warrant  or
other  right to acquire capital stock), including  a sale or issuance of capital
stock (or options, warrants or other  rights to acquire capital stock) upon  the
conversion of Debt (convertible in accordance with its terms) issued or sold for
cash subsequent to the Effective Date (in which case such capital stock shall be
deemed to have been issued for the dollar amount of such Debt so converted). The
restrictions  described above  do not prohibit  (i) the payment  of any dividend
within 60  days after  the  date of  declaration thereof,  if  at said  date  of
declaration  such payment complied  with the restrictions  described above; (ii)
the acquisition of any  shares of capital stock  of the Corporation in  exchange
for,  or  upon  conversion of,  or  out  of the  proceeds  of  the substantially
concurrent sale for  cash (other  than to a  Subsidiary) of,  shares of  capital
stock  (other  than Redeemable  Preferred) of  the  Corporation (in  which event
neither the receipt nor  the application of such  proceeds shall be included  in
any computation under this paragraph); (iii) the acquisition of capital stock of
the  Corporation  for the  purpose of  eliminating  fractional shares;  (iv) the
distribution of, or  redemption by, the  Corporation of any  rights to  purchase
capital stock of the Corporation or any other Person which rights were issued as
part  of  a  shareholder  rights  plan  (in  which  event  such  distribution or
redemption shall not be included in  any computation under this paragraph);  (v)
the  issuance, acquisition, reclassification or redemption by the Corporation of
its  capital  stock  pursuant  to  the  1988  Recapitalization  (such  issuance,
acquisition,  reclassification  or  redemption  shall  not  be  included  in any
computation under this paragraph); (vi) the making of any payment to  dissenting
stockholders  of the Corporation  pursuant to any  appraisal right arising under
law or court order; (vii) the exercise and payment of stock appreciation  rights
pursuant  to  the Corporation's  Management  Performance Plan  or  any successor
equity compensation plan or the repurchase at any time after the Effective  Date
of  Common Stock from the participants in the Management Performance Plan or any
successor  equity  compensation  plan  in  order  to  satisfy  withholding   tax
obligations (such

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payment  or  repurchase shall  not  be included  in  any computation  under this
paragraph); (viii) the cash  settlement of certain  restricted shares of  Common
Stock   pursuant  to  the  Management  Performance  Plan  (in  addition  to  the
repurchases permitted  under  clause (vii)  above)  in an  aggregate  amount  of
consideration not to exceed $750,000 (such cash settlement shall not be included
in any computation under this paragraph); and (ix) any payments or distributions
made  pursuant to  and as  described in the  Prepackaged Plan  (such payments or
distributions shall not be included in any computation under this paragraph).

    Limitation on Transactions with Affiliates

    So long as any Senior 2002 Notes are outstanding, the Corporation shall not,
and shall not permit any Subsidiary  to, directly or indirectly, enter into  any
transaction  or  series of  related transactions  involving the  purchase, sale,
lease or exchange  of property  or the  rendering of any  service by  or to  the
Corporation or any Subsidiary having a fair market value in excess of $5 million
(as reasonably determined by the Board) with any Affiliate (including financing,
acquisitions  and divestitures), unless  the Board by  resolution (excluding any
members of the Board having a financial interest in such transaction) concludes,
in its reasonable good faith judgment,  that (i) such transaction is upon  terms
no  less favorable to the Corporation or  such Subsidiary than could be obtained
in a comparable arm's-length transaction with a Person not an Affiliate and (ii)
such transaction is  reasonably necessary  or desirable for  the Corporation  or
such   Subsidiary  in  the  conduct   of  its  business  (including  financings,
acquisitions  and  divestitures).  Notwithstanding   the  requirements  of   the
foregoing sentence, transactions with any Affiliate that constitute transactions
in the ordinary course of business of such Affiliate and the Corporation or such
Subsidiary  need not  be approved  by, or  disclosed in  advance to,  the Board;
provided such transactions are periodically reported to the Board on at least  a
quarterly  basis and otherwise meet the  requirements of subclauses (i) and (ii)
of  the  preceding  sentence.  "Affiliate"  means  any  Person  other  than  the
Corporation  or any Subsidiary  which (i) directly or  indirectly through one or
more intermediaries,  controls  the  Corporation; (ii)  directly  or  indirectly
through one or more intermediaries, beneficially owns 5% or more of any class of
voting  stock of the  Corporation, CGC or  any domestic Subsidiary;  or (iii) is
controlled by any Person referred to in clauses (i) or (ii) above.

    Limitation on Guaranteed Debt

    So long as any Senior  2002 Notes are outstanding, and  at any time when  no
Debt  remains outstanding under the Credit  Agreement, the Corporation shall not
issue or incur any Debt the repayment of principal or interest or both of  which
is  guaranteed by any  Subsidiary, unless each  such Subsidiary which guarantees
such other  Debt  also  guarantees  the  Senior  2002  Notes  on  a  direct  and
unconditional basis.

    Restrictions on Merger

    So  long as any Senior 2002 Notes are outstanding, the Corporation shall not
consolidate with or merge into, or sell or transfer all or substantially all  of
its  property and assets to,  any Person unless (i)  the resulting, surviving or
transferee Person (if not the Corporation) shall be organized and existing under
the laws of the United States of America or any State thereof or the District of
Columbia, and such entity shall  expressly assume, by a supplemental  indenture,
executed  and delivered to the Senior  2002 Note Trustee,in form satisfactory to
the Senior 2002 Note Trustee, all  the obligations of the Corporation under  the
Senior  2002 Notes and each of the Senior 2002 Note Indentures; (ii) immediately
prior to and after giving effect to such transaction, no Event of Default  shall
have  occurred and be continuing; (iii)  immediately after giving effect to such
transaction, the  resulting,  surviving  or transferee  Person  could  issue  an
additional  $1.00  of Debt  pursuant  to the  restrictions  set forth  under the
heading  "Limitation  Upon   Debt  of   the  Corporation   and  its   Restricted
Subsidiaries"   above;  and  (iv)  immediately   after  giving  effect  to  such
transaction,  the  resulting,   surviving  or  transferee   Person  shall   have
Consolidated  Net Worth in an amount which is not less than the Consolidated Net
Worth (which may be negative) of the Corporation prior to such transaction.

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    Limitation on Sale and Leaseback Transactions

    So long as any Senior 2002 Notes are outstanding, except as set forth below,
the Corporation  will  not  itself,  and  it  will  not  permit  any  Restricted
Subsidiary  to, enter into  any transaction with any  bank, insurance company or
other lender or investor, or to  which any such bank, insurance company,  lender
or  investor  is a  party, providing  for the  leasing by  the Corporation  or a
Restricted Subsidiary of any Principal Operating Property owned at the Effective
Date which has  been or is  to be sold  or transferred by  the Corporation or  a
Restricted  Subsidiary  to such  bank, company,  lender or  investor, or  to any
Person to whom funds  have been or  are to be advanced  by such bank,  insurance
company, lender or investor on the security of such Principal Operating Property
(a  "sale and leaseback transaction"). The  restriction described above does not
apply to  any sale  and leaseback  transaction if  (i) the  Corporation or  such
Restricted  Subsidiary  could  create  Debt secured  by  a  Mortgage  (under the
restrictions set forth under "Limitation of Secured Debt of the Corporation  and
its Restricted Subsidiaries" below, without regard to clauses (i) through (viii)
thereof), on the Principal Operating Property to be leased in an amount equal to
the  Attributable  Debt  with respect  to  such sale  and  leaseback transaction
without equally and ratably securing the Securities; or (ii) within 120 calendar
days after  the sale  or transfer  has  been made  by the  Corporation or  by  a
Restricted  Subsidiary, the  Corporation or  a Restricted  Subsidiary applies an
amount equal  to the  greater of  (A)  the net  proceeds from  the sale  of  the
Principal Operating Property leased pursuant to such arrangement or (B) the fair
market  value  of the  Principal Operating  Property  so leased  at the  time of
entering into such  arrangement (as  determined in  any manner  approved by  the
Board) to the retirement of Senior Funded Debt of the Corporation or Funded Debt
of  a Restricted  Subsidiary; provided,  that the  amount to  be applied  to the
retirement of  Senior  Funded  Debt of  the  Corporation  or Funded  Debt  of  a
Restricted  Subsidiary will be reduced by (x) the principal amount of any Senior
2002 Notes (or other debentures or notes constituting Senior Funded Debt of  the
Corporation  or  Funded Debt  of a  Restricted  Subsidiary) delivered  within 75
calendar days after such  sale or transfer  to the Senior  2002 Note Trustee  or
other  applicable trustee for retirement and  cancellation and (y) the principal
amount of Senior Funded Debt of the  Corporation or Funded Debt of a  Restricted
Subsidiary,  other  than  Funded  Debt included  under  clause  (x), voluntarily
retired by the Corporation  or a Restricted Subsidiary  within 75 calendar  days
after  such  sale;  provided  further that,  notwithstanding  the  foregoing, no
retirement referred  to  in this  clause  (ii) may  be  effected by  payment  at
maturity  or pursuant  to any  mandatory sinking  fund payment  or any mandatory
prepayment provision; (iii) the lease in such sale and leaseback transaction  is
for  a period,  including renewals, of  no more  than three years;  or (iv) such
arrangement is between the  Corporation and a  Restricted Subsidiary or  between
Restricted Subsidiaries.

    Limitation   of  Secured  Debt   of  the  Corporation   and  its  Restricted
Subsidiaries

    So long as any Senior 2002  Notes are outstanding, the Corporation will  not
itself,  and will not permit any Restricted Subsidiary to, incur, issue, assume,
guarantee or suffer to exist any  indebtedness for borrowed money (for  purposes
hereof,  "Secured  Debt")  secured  by a  Mortgage  on  any  Principal Operating
Property of the Corporation or any Restricted Subsidiary, or any shares of stock
of or Debt of any Restricted Subsidiary, without effectively providing that  the
Senior  2002 Notes (together  with, if the Corporation  so determines, any other
Debt  of  the  Corporation  or  such  Restricted  Subsidiary  then  existing  or
thereafter  created which is not subordinated  Debt) will be secured equally and
ratably with (or, at the option of the Corporation, prior to) such Secured  Debt
so  long as such  Secured Debt will  be so secured,  unless, after giving effect
thereto, the aggregate  amount of all  such Secured Debt  plus all  Attributable
Debt  of the Corporation and its Restricted  Subsidiaries in respect of sale and
leaseback transactions (other  than those  exempt described  under clauses  (ii)
through (iv), inclusive, under "Limitation Upon Sale and Leaseback Transactions"
above) would not exceed 5% of Consolidated Net Tangible Assets (as defined under
"the   1986  Indenture  Securities  --  Limitation  Upon  Secured  Debt  of  the
Corporation and its Restricted Subsidiaries"  above). This restriction will  not
apply  to, and there will be excluded from Secured Debt in any computation under
such restriction, Debt secured by (i) Mortgages on, and limited to, property of,
or on any shares of  stock of or Debt of,  any corporation existing at the  time
such corporation becomes a Restricted Subsidiary; (ii) Mortgages in favor of the
Corporation  or  any  Restricted Subsidiary;  (iii)  Mortgages in  favor  of any
governmental body to secure progress, advance or

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other payments pursuant to any contract or provision of any statute; (iv) (A) if
made and continuing in the ordinary course of business, any Mortgage as security
for the performance of any contract or undertaking not directly or indirectly in
connection with the  borrowing of  money or  the securing  of Debt,  or (B)  any
Mortgage  with  any governmental  agency required  or  permitted to  qualify the
Corporation or  any  Restricted  Subsidiary to  conduct  business,  to  maintain
self-insurance  or to  obtain the  benefits of  any law  pertaining to workmen's
compensation, unemployment  insurance,  old  age pensions,  social  security  or
similar matters; (v) Mortgages for taxes, assessments or governmental charges or
levies  if such taxes,  assessments, governmental charges or  levies will not at
the time be  due and  payable, or  if the same  thereafter can  be paid  without
penalty,  or  if the  same  are being  contested  in good  faith  by appropriate
proceedings; (vi) Mortgages created by or resulting from any litigation or legal
proceeding which  at the  time is  currently being  contested in  good faith  by
appropriate  proceedings; or Mortgages arising out  of judgments or awards as to
which the  time for  prosecuting an  appeal  or proceeding  for review  has  not
expired;  (vii)  Mortgages on,  and  limited to,  property  (including leasehold
estates), shares of stock  or Debt existing at  the time of acquisition  thereof
(including acquisition through merger or consolidation) or to secure the payment
of  all or any part of the purchase  price thereof or construction thereon or to
secure any Debt incurred prior to, at  the time of, or within 120 calendar  days
after  the  later of  the  acquisition, the  completion  of construction  or the
commencement of full  operation of  such property  or within  120 calendar  days
after the acquisition of such shares or Debt for the purpose of financing all or
any  part of the purchase  price thereof or construction  thereon; or (viii) any
extension,  renewal  or  replacement  (or  successive  extension,  renewals   or
replacements),  as  a whole  or  in part,  of any  Mortgage  referred to  in the
foregoing  clauses  (i)  through  (vii),  inclusive,  provided  that  (A)   such
extension,  renewal or replacement Mortgage will be  limited to all or a part of
the same  property,  shares  of stock  or  Debt  that secured  the  Mortgage  so
extended,  renewed or replaced (plus improvements  on such property) and (B) the
Debt secured by such Mortgage at such time is not increased. "Attributable Debt"
is defined in general to mean the total  net amount of rent required to be  paid
during the remaining term of any lease, discounted at a rate equal to 10 1/2%.

    EVENTS OF DEFAULT

    Each  of the Senior  2002 Note Indentures contain  certain events of default
("Events of  Default"), remedies  upon  such Events  of Default  and  provisions
regarding  notices of default, waivers of default and certificates of compliance
comparable to those contained in the 1986 Indenture, as supplemented by the Bond
Board Resolutions. In  addition, an  Event of Default  shall be  deemed to  have
occurred  if the  Corporation or  USG Interiors shall  fail to  repay either the
Extended Revolving Credit  Facility or  the Bank Term  Loans when  due upon  the
respective  final scheduled maturity date thereof  and, as a result thereof, the
Bank Group  files a  Notice of  Actionable Default  under the  Collateral  Trust
Agreement  or  a  written  demand  for  payment  under  any  of  the  Subsidiary
Guarantees. See "The 1986 Indenture Securities -- Events of Default."

    DEFEASANCE

    The Senior  2002 Note  Indentures  contain provisions  regarding  defeasance
comparable to those contained in the 1986 Indenture, as supplemented by the Bond
Board  Resolutions. Upon defeasance of the  Senior 2002 Notes in accordance with
such provisions, the Corporation will no longer be obligated to comply with  any
of  the negative covenants described under "Certain Covenants of the Corporation
and its Restricted Subsidiaries"  above. See "The  1986 Indenture Securities  --
Defeasance."

    MODIFICATION

    Each  of  the  Senior  2002  Note  Indentures  contain  provisions regarding
modifications  and  amendments  comparable  to  those  contained  in  the   1986
Indenture,  as  supplemented  by  the  Bond  Board  Resolutions.  See  "The 1986
Indenture Securities -- Modification of the Indenture."

                        DESCRIPTION OF COLLATERAL TRUST

    In connection with the 1988 Recapitalization, the Corporation established  a
collateral  trust pursuant to  the Collateral Trust Agreement,  dated as of July
13, 1988 (the "Old Collateral Trust Agreement"),

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among the  Corporation  and  certain  of  the  Subsidiaries  (collectively,  the
"Grantors")  and Wilmington Trust Company and William J. Wade (collectively, the
"Collateral Trustee"). Under  the Old Collateral  Trust Agreement, the  Grantors
granted  a first priority security  interest in (i) all  of the capital stock of
the Corporation's principal  domestic Subsidiaries, including  U.S. Gypsum,  USG
Interiors,  L&W Supply and  USG Foreign Investments,  Ltd.; and (ii)  65% of the
capital stock of CGC and certain other of the Corporation's foreign Subsidiaries
(collectively, the "Collateral"). The Collateral is held in trust for the  equal
and  ratable benefit of the  holders of (i) the  Bank Debt Obligations; and (ii)
the  senior  debt  securities,  including  the  1986  Indenture  Securities.  In
connection  with  the  Restructuring,  the Old  Collateral  Trust  Agreement was
amended to provide that the Senior 1995 Notes, the Senior 1998 Notes and  Senior
2002  Notes (together with the Bank Debt Obligations and the previously existing
senior debt securities, the "Senior Secured Obligations") be equally and ratably
secured with  the  other  Senior  Secured  Obligations  (the  "Collateral  Trust
Agreement").  In  connection  with  the  Note  Placement,  the  Collateral Trust
Agreement is being further amended to provide that the Senior 2001 Notes will be
equally and ratably secured with the other Senior Secured Obligations.

    Under the Collateral  Trust Agreement, an  "Actionable Default" occurs  upon
the  acceleration  of  any  of  the Senior  Secured  Obligations.  A  "Notice of
Actionable Default" may be given (i) in the case of an acceleration of the  Bank
Debt  Obligations, by the Administrative Agent under the Credit Agreement or the
holders of  a majority  of  the Bank  Debt  Obligations (the  "Requisite  Senior
Lenders");  or (ii) in the case of  an acceleration of any series of securities,
by the trustee under the indenture  governing such series or, if provided  under
the  terms of such series, by the requisite  holders of such series. A Notice of
Actionable Default may be withdrawn by the  party which gave it (i) at any  time
when  the Collateral Trustee has not exercised  any remedies with respect to the
Collateral as  a  result  thereof  or (ii)  after  the  Collateral  Trustee  has
exercised  remedies if the Requisite Senior  Lenders consent to such withdrawal.
In addition, a Notice of Actionable  Default is deemed withdrawn when the  party
giving  such  Notice has  acknowledged  payment in  full  of the  Senior Secured
Obligations owing to it. Until such time as any Notice of Actionable Default  is
given  (and after the time when any such Notice has been withdrawn), the pledgor
thereof may vote any  securities comprising the Collateral.  At any time when  a
Notice  of Actionable Default  has been given and  not withdrawn, the Collateral
Trustee may,  upon  written  notice  to the  Corporation,  vote  any  securities
comprising the Collateral.

    All of the Collateral will be released (i) upon the consent and direction of
the  Bank Group  or (ii)  at such time  as the  Bank Debt  Obligations have been
repaid in  full. In  addition, the  Requisite Senior  Lenders may  instruct  the
Collateral Trustee to release specified portions of the Collateral (e.g., in the
case  of asset sales approved by the  holders of the Bank Debt Obligations under
the Credit  Agreement) provided  that no  Actionable Default  has occurred.  The
holders  of  the Corporation's  Securities  do not  have  any similar  rights to
authorize release of  the Collateral. Under  the terms of  the Collateral  Trust
Agreement,  the Collateral and  proceeds so released revert  to the Grantors and
are not required to be distributed into the Collateral Account (defined  below).
For  a description  of the rights  of the  holders of the  Bank Debt Obligations
under the Credit Agreement, see "Description of Credit Agreement."

    Following receipt of a  Notice of Actionable  Default, the Requisite  Senior
Lenders  have the right to direct the Collateral Trustee to exercise, or refrain
from exercising, any  rights or  remedies with  respect to  the Collateral.  The
holders of the Securities do not have any similar right to direct the actions of
the  Collateral  Trustee.  See  "Risk Factors  --  Control  of  Collateral Trust
Agreement by Bank Group." In the absence of relevant directions, the  Collateral
Trustee has the power to act on its own initiative. At any time when a Notice of
Actionable Default has been given and not withdrawn, the Collateral Trustee may,
and  at the direction of the Requisite Senior Lenders shall, sell the Collateral
for the benefit of the holders of the Senior Secured Obligations. Funds  derived
from  any sale  of Collateral  and (at  all times  after a  Notice of Actionable
Default has been given and  not withdrawn) dividends and distributions  received
on  the Collateral  are to  be deposited  to the  collateral account established
under the Collateral Trust Agreement (the "Collateral Account"). The  Collateral
Trustee  shall distribute all  moneys in the Collateral  Account as follows: (i)
first, to the Collateral Trustee for unpaid fees; (ii) second, to the holders of
the Senior Secured Obligations ratably (on  the basis of unpaid amounts) to  (a)
pay the portion of the Senior

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Secured  Obligations  which  is  then  due  and  payable  and  (b)  provide cash
collateral (on a dollar-for-dollar basis) for the portion of the Senior  Secured
Obligations which is not then due and payable; and (iii) third, to the Grantors.

                          DESCRIPTION OF CAPITAL STOCK

GENERAL MATTERS

    The  total  number  of shares  of  capital  stock that  the  Corporation has
authority to issue is  236,000,000, consisting of  200,000,000 shares of  Common
Stock,  par value $0.10 per share, and 36,000,000 shares of Preferred Stock, par
value $1.00 per share.  Upon completion of this  Offering, 43,158,085 shares  of
Common  Stock  will  be issued  and  outstanding,  assuming no  exercise  of the
Underwriters' over-allotment option, and  no shares of  Preferred Stock will  be
issued  or  outstanding.  The following  summary  of certain  provisions  of the
Corporation's capital stock describes all  material provisions of, but does  not
purport  to be complete and is subject to, and qualified in its entirety by, the
Certificate of Incorporation and the By-laws  of the Corporation, each of  which
is included as an exhibit to the Registration Statement of which this Prospectus
forms a part.

COMMON STOCK

    The  issued and outstanding  shares of Common  Stock are, and  the shares of
Common Stock being offered will be upon payment therefor, validly issued,  fully
paid  and  nonassessable. Subject  to the  prior  rights of  the holders  of any
Preferred Stock, if any, the holders  of outstanding shares of Common Stock  are
entitled  to receive dividends out of  assets legally available therefor at such
times and  in such  amounts as  the Board  of Directors  may from  time to  time
determine.  The Corporation  is currently a  party to  various credit agreements
which prohibit the payment  of dividends. See "Risk  Factors -- Restrictions  on
Common  Stock Dividends."  Upon liquidation,  dissolution or  winding up  of the
Corporation, the holders of  Common Stock are entitled  to receive pro rata  the
assets  of the Corporation  which are legally  available for distribution, after
payment of all debts and  other liabilities and subject  to the prior rights  of
any  holders of Preferred Stock then outstanding, if any. Each outstanding share
of Common Stock is entitled  to one vote on all  matters submitted to a vote  of
stockholders. There is no cumulative voting.

    The Common Stock of the Corporation is traded on the New York Stock Exchange
under the symbol "USG." On January 3, 1994, the last reported sales price of the
Common  Stock, as reported  on the New  York Stock Exchange  Composite Tape, was
$29.625 per share.

CERTAIN PROVISIONS OF THE CERTIFICATE OF INCORPORATION AND BY-LAWS

    The Certificate  of Incorporation  and By-laws  of the  Corporation  contain
certain provisions that are intended to enhance the likelihood of continuity and
stability  in the  composition of  the Board  and which  may have  the effect of
delaying, deferring or preventing a future takeover or change in control of  the
Corporation  unless such takeover or change in control is approved by the Board.
Such provisions  may  also  render the  removal  of  the current  Board  and  of
management more difficult.

    The Corporation's Certificate of Incorporation provides for three classes of
directors,  each of which  is to be elected  on a staggered basis  for a term of
three years.  At  present, the  Board  is composed  of  14 directors  (with  one
vacancy). Two classes of directors are composed of five members and the third is
composed   of   four  members.   In  connection   with  the   Prepackaged  Plan,
representatives of certain creditors of the  Corporation nominated a total of  5
directors. See "Management -- Directors of the Corporation." If the Water Street
Directors  are removed from office without  the consent of Water Street, certain
restrictions on the Water Street Entities  relating to the purchase, voting  and
transfer  of shares of  Common Stock will  terminate. See "Certain Relationships
and Related Transactions -- Agreement with Water Street Entities."

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<PAGE>
    The  affirmative vote or consent of at least  80% of the voting power of all
of the stock of the Corporation entitled to vote in the election of directors is
required to  approve certain  types of  transactions with  another  corporation,
person  or  entity  which,  directly  or indirectly,  owns  5%  or  more  of the
outstanding shares of any class of the Corporation's stock which is entitled  to
vote  in  the  election of  directors.  Such  transactions include  a  merger or
consolidation of the  Corporation or  any of its  Subsidiaries, sale  of all  or
substantially all of the assets of the Corporation or any of its Subsidiaries or
the  sale or lease of any assets  (except assets having an aggregate fair market
value of less than $10 million) in exchange for certain types of securities. The
Board may render  such super-majority  voting requirements  inapplicable by  (i)
approving  a memorandum of understanding with  such other corporation, person or
entity with  respect  to  such  a  transaction  prior  to  the  time  that  such
corporation,  person or entity becomes the beneficial owner of 5% or more of any
class of voting stock or (ii) approving  such a transaction after the time  that
such  other corporation, person or entity becomes  the beneficial owner of 5% or
more of any  class of voting  stock if a  majority of the  members of the  Board
approving  such transaction  were duly elected  and acting members  of the Board
prior to  the time  that such  other corporation,  person or  entity became  the
beneficial owner of 5% or more of any class of voting stock. This super-majority
voting requirement applies to Water Street.

    Any  action to be taken at any  annual or special meeting of stockholders of
the Corporation may only be taken without  a meeting if a consent in writing  is
signed  by the holders  of at least 80%  of the voting  power of the Corporation
entitled to vote with respect to such subject matter.

    The provisions in the Certificate of Incorporation described above may  only
be amended by 80% of the voting power of the Corporation entitled to vote in the
election of directors.

PREFERRED STOCK

    Upon  consummation of  the Offering,  there will  be no  shares of Preferred
Stock issued or outstanding. The Corporation  has no present intention to  issue
any  shares of  Preferred Stock. However,  the Corporation's  Board of Directors
may, without  further action  by the  Corporation's stockholders,  from time  to
time, direct the issuance of shares of Preferred Stock in series and may, at the
time  of issuance,  determine the  rights, preferences  and limitations  of each
series. Satisfaction  of  any  dividend preferences  of  outstanding  shares  of
Preferred  Stock would reduce the  amount of funds available  for the payment of
dividends on shares of Common Stock. Holders of shares of Preferred Stock may be
entitled to  receive a  preference  payment in  the  event of  any  liquidation,
dissolution  or winding-up of the Corporation before  any payment is made to the
holders of shares of Common Stock. Under certain circumstances, the issuance  of
shares  of Preferred  Stock may  render more difficult  or tend  to discourage a
merger, tender offer or proxy contest, the assumption of control by a holder  of
a  large  block of  the  Corporation's securities  or  the removal  of incumbent
management. The  Board  of Directors  of  the Corporation,  without  stockholder
approval,  may issue shares of Preferred Stock with voting and conversion rights
which could adversely affect the holders of shares of Common Stock.

CERTAIN PROVISIONS OF DELAWARE LAW

    The Corporation is governed by the provisions of Section 203 of the Delaware
General Corporation  Law.  In  general,  the law  prohibits  a  public  Delaware
corporation  from  engaging  in  a "business  combination"  with  an "interested
stockholder" for a period of  three years after the  date of the transaction  in
which   the  person  became  an  interested  stockholder,  unless  the  business
combination is approved in a prescribed manner. "Business combination"  includes
mergers,  asset sales and other transactions resulting in a financial benefit to
the stockholder.  An "interested  stockholder" is  a person  who, together  with
affiliates  and associates, owns (or within three years, did own) 15% or more of
the corporation's voting stock.

SHAREHOLDER RIGHTS PLAN

    The Corporation's  rights agreement  (the  "Rights Agreement")  between  the
Corporation  and  Harris  Trust  (the "Rights  Agent")  entitles  the registered
stockholder to  purchase  from the  Corporation  one-hundredth share  of  Junior
Series  C Preferred Stock at a price of $35 per one-hundredth share (the "Rights
Purchase Price"), subject to adjustment.

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<PAGE>
    Until the earlier to  occur of (i)  10 days following the  date of a  public
announcement  that a  person or  group of  affiliated or  associated persons (an
"Acquiring Person"), other than  the Corporation, any  employee benefit plan  of
the Corporation, any entity holding Common Stock for or pursuant to the terms of
any  such plan or, except as described  below, Water Street or its affiliated or
associated persons,  has beneficial  ownership  (as defined  in the  New  Rights
Agreement)  of 20% or  more of the  then outstanding Common  Stock, (ii) 10 days
following the date of a public announcement that a person or group of affiliated
or associated persons (an "Adverse Person")  has beneficial ownership of 10%  or
more  of the then  outstanding Common Stock,  the acquisition of  which has been
determined by the Board  to present an  actual threat of  an acquisition of  the
Corporation  that  would  not  be  in the  best  interest  of  the Corporation's
stockholders or (iii) 10 days following  the date of commencement of, or  public
announcement  of, a tender offer or exchange offer for 30% or more of the Common
Stock (the earliest  of such dates  being called the  "Distribution Date"),  the
Rights  will be evidenced, with respect to the Common Stock, by the certificates
which will  represent such  Common Stock.  The Rights  Agreement provides  that,
until  the Distribution Date, the Rights will  be transferred with and only with
the  Common  Stock  certificates.  Until  the  Distribution  Date  (or   earlier
redemption  or expiration of the Rights), Common Stock certificates issued after
May 6, 1993 upon transfer or new  issuance of shares of Common Stock  (including
any  shares of Common Stock issued pursuant to the Restructuring) will contain a
notation incorporating the Rights Agreement by reference.

    The Rights Agreement provides that, until December 31, 1997, Water  Street's
beneficial  ownership of  any shares  of common  Stock (or  warrants to purchase
Common Stock or securities exchangeable for or convertible into Common Stock  or
warrants   to  purchase   any  such  exchangeable   or  convertible  securities)
(collectively,  "Specified  Securities")  acquired  pursuant  to  any  Permitted
Acquisition (as defined in the Water Street Agreement) will not cause any of the
following to occur: (a) any Water Street Entity to become an Acquiring Person or
an  Adverse Person, (b) the Distribution Date,  (c) the transfer of Common Stock
of the Corporation (or its successor by  operation of law or under the terms  of
the  Rights Agreement) no longer constituting  the transfer of associated Rights
or the distribution of Rights Certificates, (d) the Rights becoming exercisable,
non-redeemable or non-amendable, (e) a condition the result of which Rights  may
be  exchanged for Common Stock in the  manner described in the Rights Agreement,
or (f) the  Rights Purchase Price  or the amount  of securities acquirable  upon
payment  thereof  to be  adjusted  (collectively, the  "Specified  Events"). The
Rights Agreement further provides that, until the tenth anniversary of the Water
Street Agreement, (i) from and after any distribution of shares of Common  Stock
by Water Street to its partners and until the Water Street Entities beneficially
own  a percentage of the  outstanding shares of Common  Stock which is less than
10% of the outstanding  Common Stock (the  "Flip-In Threshold"), the  beneficial
ownership  by  the  Water  Street  Entities (other  than  Water  Street)  of any
Specified Securities acquired pursuant to any Permitted Acquisition or Permitted
Acquisitions shall not cause any  of the Specified Events  to occur, so long  as
the  Water Street Entities shall have voted  the shares of Common Stock owned by
them in accordance with the terms of the Water Street Agreement; (ii) until  the
Water Street Entities beneficially own a percentage of the outstanding shares of
Common  Stock which is  less than the Flip-In  Threshold, the acquisition (other
than pursuant to  any Permitted  Acquisition or Permitted  Acquisitions) by  the
Water  Street Entities  (which acquisition,  in the  case of  persons other than
natural persons, is made in the ordinary course of business), including but  not
limited  to acquisitions  on behalf  of proprietary  accounts and  accounts with
respect to which any of the Water Street Entities has investment discretion,  of
up  to an aggregate of 10% of the outstanding shares of Common Stock at the time
of acquisition shall not cause any of  the Specified Events to occur; (iii)  the
acquisition  (other  than pursuant  to  any Permitted  Acquisition  or Permitted
Acquisitions) by the Water  Street Entities (which acquisition,  in the case  of
persons  other than natural persons, is made in the ordinary course of business)
of an aggregate of more  than 10% of the outstanding  shares of Common Stock  at
the  time of acquisition shall  not cause any of  the Specified Events to occur,
provided that, within  ten business  days after the  Corporation notifies  Water
Street  of such ownership, the Water  Street Entities sell or otherwise transfer
or dispose of Common Stock, so that, after giving effect to those  transactions,
the  number of  shares of  Common Stock beneficially  owned by  the Water Street
Entities that were acquired other than pursuant to any Permitted Acquisition  or
Permitted Acquisitions is not greater than

                                       95
<PAGE>
an aggregate of 10% of the then outstanding shares of Common Stock; and (iv) any
percentage  increase  in  any  Water  Street  Entity's  beneficial  ownership of
outstanding shares of Common Stock that  results from the acquisition of  shares
of  Common Stock  by the  Corporation or  its Subsidiaries  shall not  cause any
Specified Event to occur.

    Until the  Distribution Date  (or earlier  redemption or  expiration of  the
Rights),  the surrender for  transfer of any Common  Stock certificate also will
constitute  the  transfer  of  the  Rights  associated  with  the  Common  Stock
represented   by  such  certificate.  As   soon  as  practicable  following  the
Distribution Date,  separate certificates  evidencing  the Rights  (the  "Rights
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date and such separate Rights Certificates
alone  will  evidence  the Rights.  The  Rights  are not  exercisable  until the
Distribution Date. The Rights will expire on May 6, 2003 (the "Final  Expiration
Date"),  unless earlier redeemed by the  Corporation as described below. Until a
Right is  exercised, the  holder thereof,  as such,  will have  no rights  as  a
stockholder of the Corporation, including, without limitation, the right to vote
or to receive dividends.

    In  the event that, at any time  after the first public announcement that an
Acquiring Person  or an  Adverse  Person has  become  such, the  Corporation  is
involved  in a merger or other business combination where the Corporation is not
the surviving corporation or where Common Stock is changed or exchanged or in  a
transaction  where 50% or more  of its consolidated assets  or earning power are
sold, proper provision will be made so  that each holder of a Right (other  than
such  Acquiring  Person or  Adverse Person)  will thereafter  have the  right to
receive, upon the  exercise thereof at  the then-current exercise  price of  the
Right,  that number of shares of common  stock of the acquiring company which at
the time of such transaction would have a market value of two times the exercise
price of the Right.

    In the event that the Corporation  is the surviving corporation in a  merger
or other business combination involving an Acquiring Person or an Adverse Person
and  the Common Stock remains outstanding and  unchanged or in the event that an
Acquiring Person or an Adverse Person engages in one of a number of self-dealing
transactions specified in the Rights Agreement, proper provision will be made so
that each holder of  a Right, other  than Rights that  are or were  beneficially
owned  (as  defined in  the Rights  Agreement)  by the  Acquiring Person  or the
Adverse Person, as the case  may be, on the  earliest of the Distribution  Date,
the  date the Acquiring  Person acquires 20%  or more of  the outstanding Common
Stock or the  date the  Adverse Person becomes  such (which  will thereafter  be
void),  will thereafter  have the  right to  receive upon  exercise thereof that
number of shares  of Common  Stock having  a market value  at the  time of  such
transaction  of two times  the exercise price  of the Right.  In addition, under
certain circumstances the Board has the option of exchanging all or part of  the
Rights  (excluding void Rights) for Common Stock  in the manner described in the
Rights Agreement.  The  Rights Agreement  also  contains a  so-called  "flip-in"
feature  which provides that if any person  or group of affiliated or associated
persons becomes an  Adverse Person,  then the  provisions of  the preceding  two
sentences shall apply.

    The  Rights Agreement also  provides that, at  any time prior  to the public
announcement that an Acquiring Person or an Adverse Person has become such,  the
Board  may (i) redeem the Rights  in whole, but not in  part, at a price of $.01
per Right (the "Redemption Price") or (ii) amend the New Rights Agreement in any
respect other  than  any amendment  which  would reduce  the  Redemption  Price,
shorten  the Final Expiration Date or increase the Rights Purchase Price. At any
time after the public  announcement that an Acquiring  Person or Adverse  Person
has become such, the Corporation may amend the Rights Agreement only in a manner
which would not adversely affect the holders of the Rights. Immediately upon the
action  of the Board  electing to redeem  the Rights, the  right to exercise the
Rights will terminate and  the only right  of the holders of  Rights will be  to
receive the Redemption Price.

    The  Purchase Price payable, and the number  of shares of Series C Preferred
Stock or other securities or property issuable, upon exercise of the Rights  are
subject  to adjustment from time to time to prevent dilution as described in the
Rights Agreement. With certain exceptions, no adjustment in the Rights  Purchase
Price  will be required until cumulative adjustments require an adjustment of at
least 1% in  such Rights  Purchase Price. No  fractional shares  will be  issued
(other than fractions which are integral

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<PAGE>
multiples  of  one hundredth  of  a share,  which may,  at  the election  of the
Corporation, be  evidenced by  depositary  receipts), and  in lieu  thereof,  an
adjustment  in cash  will be  made based  on the  market price  of the  Series C
Preferred Stock on the last trading date prior to the date of exercise.

    The Series C Preferred Stock purchasable upon exercise of the Rights will be
nonredeemable and junior  to any outstanding  shares of preferred  stock of  the
Corporation.  Each  share  of  Series  C Preferred  Stock  will  have  a minimum
preferential quarterly dividend rate of $25  per share, but will be entitled  to
receive,  in the aggregate, a dividend of 100 times the dividend declared on the
shares of Common Stock. In the event of liquidation, the holders of the Series C
Preferred Stock will receive a minimum preferential liquidation payment of  $100
per  share, but  will be  entitled to  receive an  aggregate liquidation payment
equal to 100 times  the payment made  per share of Common  Stock. Each share  of
Series  C Preferred Stock will  have 100 votes, voting  together with the Common
Stock. In the event of any merger, consolidation, or other transaction in  which
shares  of Common Stock  are exchanged, each  share of Series  C Preferred Stock
will be  entitled  to  receive  100  times the  amount  and  the  same  type  of
consideration  received per share  of Common Stock.  The rights of  the Series C
Preferred Stock as  to dividends, liquidation  and voting, and  in the event  of
mergers and consolidations, are protected by customary anti-dilution provisions.
Because  of the nature  of the Series C  Preferred Stock's dividend, liquidation
and voting rights, the value  of the interest in a  share of Series C  Preferred
Stock should approximate the value of one share of Common Stock.

    The  Rights  have  certain  anti-takeover  effects.  The  Rights  will cause
substantial dilution  to  a  person  or  group  that  attempts  to  acquire  the
Corporation  on terms  not approved  by the Board,  except pursuant  to an offer
conditioned on a substantial number of Rights being acquired. The Rights  should
not  interfere with  any merger  or other  business combination  approved by the
Board since the  Rights may be  redeemed by  the Corporation at  $.01 per  Right
prior to the public announcement that a person has become an Acquiring Person or
an Adverse Person.

    In  connection with the settlement of certain  litigation at the time of the
1988 Recapitalization, the Corporation agreed, subject to certain conditions, to
submit the question of whether to redeem the Rights to a stockholder vote  three
years  after  consummation  of  the 1988  Recapitalization.  At  the stockholder
meeting held on  May 8,  1991, the Corporation  submitted such  question to  the
stockholders. There were 4,797,682 votes cast in favor of redemption, 30,443,533
votes  cast against redemption and 1,863,275 abstentions. The proposal to redeem
the Rights accordingly was not adopted.

LIMITATIONS ON LIABILITY AND INDEMNIFICATION OF OFFICERS AND DIRECTORS

    The Certificate of Incorporation  limits the liability  of directors to  the
fullest  extent permitted by the Delaware  General Corporation Law. In addition,
the Certificate of Incorporation provides  that the Corporation shall  indemnify
directors  and officers  of the Corporation  to the fullest  extent permitted by
such law.

TRANSFER AGENT AND REGISTRAR

    The Transfer Agent and  Registrar for the Common  Stock is Harris Trust  and
Savings Bank.

                                  UNDERWRITING

    Subject to the terms and conditions set forth in the Underwriting Agreement,
the  Corporation and the Selling Stockholder have  agreed to sell to each of the
entities named below  (the "Underwriters"),  and each of  the Underwriters,  for
whom   Salomon   Brothers   Inc,  Lazard   Freres   &  Co.   and   Smith  Barney

                                       97
<PAGE>
Shearson  Inc.  are  acting  as  representatives  (the  "Representatives"),  has
severally  agreed to purchase  from the Corporation  and the Selling Stockholder
the number of shares of Common Stock set forth opposite its name below:

<TABLE>
<CAPTION>
                                                                                   NUMBER OF
                                 UNDERWRITERS                                       SHARES
- -------------------------------------------------------------------------------  -------------
<S>                                                                              <C>
Salomon Brothers Inc...........................................................
Lazard Freres & Co.............................................................
Smith Barney Shearson Inc......................................................
                                                                                 -------------
  Total........................................................................
                                                                                 -------------
                                                                                 -------------
</TABLE>

    In the Underwriting Agreement, the several Underwriters have agreed, subject
to the terms and conditions set forth therein, to purchase all 8,500,000  shares
of Common Stock offered hereby (other than the shares of Common Stock covered by
the over-allotment options described below) if any such shares are purchased. In
the  event of a default by  any Underwriter, the Underwriting Agreement provides
that, in  certain  circumstances,  purchase  commitments  of  the  nondefaulting
Underwriters  may be increased or the  Underwriting Agreement may be terminated.
The Corporation  has  been  advised  by the  Representatives  that  the  several
Underwriters propose initially to offer such shares at the public offering price
set  forth on the cover page of this  Prospectus, and to certain dealers at such
price, less a concession not in excess of  $    per share. The Underwriters  may
allow,  and such dealers  may reallow, a  concession not in  excess of $     per
share to other dealers.  After this public offering,  the public offering  price
and such concessions may be changed.

    The Corporation and the Selling Stockholder have granted to the Underwriters
options, exercisable during the 30-day period after the date of this Prospectus,
to  purchase up to  637,500 and 637,500 additional  shares, respectively, at the
same price per  share as  the initial  8,500,000 shares  of Common  Stock to  be
purchased by the Underwriters. The Underwriters may exercise such option only to
cover  over-allotments  in the  sale  of the  shares  of Common  Stock  that the
Underwriters have  agreed  to purchase.  To  the extent  that  the  Underwriters
exercise  such option, each Underwriter will  have a firm commitment, subject to
certain conditions, to purchase the same proportion of the option shares as  the
number of shares of Common Stock to be purchased and offered by such Underwriter
in the above table bears to the total number of shares of Common Stock initially
offered by the Underwriters.

    The  Corporation and [the  Selling Stockholder] have agreed  not to sell, or
otherwise dispose of, or announce the  offering of, any shares of Common  Stock,
or  any securities convertible  into, or exchangeable  for, or exercisable into,
shares of  Common  Stock, except  the  shares of  Common  Stock offered  in  the
Offering,  for  a period  of 180  days from  the date  hereof without  the prior
written consent of the Representatives;  provided, however, the Corporation  may
issue  and sell Common Stock (or  options exercisable for Common Stock) pursuant
to any employee or  non-employee director stock option  plan or stock  ownership
plan  of the Corporation  in effect on  the date hereof  and the Corporation may
issue Common Stock or any securities  convertible into, or exchangeable for,  or
exercisable  into shares of Common Stock pursuant to the terms of any securities
outstanding on the date hereof or other obligations binding upon the Corporation
and in effect on the date hereof.

    The Underwriting Agreement  provides that  the Corporation  and the  Selling
Stockholder will indemnify the several Underwriters against certain liabilities,
including  liabilities under the  Securities Act, or  contribute to payments the
Underwriters may be required to make in respect thereof.

    From April 1991  to May 1993,  Salomon Brothers Inc  ("Salomon") and  Lazard
Freres & Co.
("Lazard")  advised  the  Corporation  in connection  with  the  development and
implementation of the Restructuring for  which they received customary fees  and
reimbursement  of expenses. Salomon  has also provided  other financial advisory
and investment banking services to the Corporation from time to time  including,
during  the past two years,  with respect to the  divestiture of DAP and certain
business

                                       98
<PAGE>
strategy issues  for  which it  received  customary fees  and  reimbursement  of
expenses.  In addition, Smith Barney Shearson Inc. acted as financial advisor to
certain holders  of  the Company's  subordinated  debt in  connection  with  the
Restructuring and received customary fees and reimbursement of expenses.

                                 LEGAL MATTERS

    The  validity of the  shares of Common  Stock offered hereby  will be passed
upon for the Corporation by Kirkland  & Ellis, Chicago, Illinois. Certain  legal
matters  will be passed upon  for the Underwriters by  Wachtell, Lipton, Rosen &
Katz, New York, New York.

                                    EXPERTS

    The consolidated balance sheets  as of December 31,  1992 and 1991, and  the
consolidated  statements of earnings, retained earnings, and cash flows for each
of the three years in the period  ended December 31, 1992, have been audited  by
Arthur  Andersen &  Co., independent public  accountants, as  indicated in their
reports with respect  thereto (which  reports include  an explanatory  paragraph
which   discusses  an  uncertainty  relating  to  substantial  doubt  about  the
Corporation's ability to continue as a  going concern), and are included  herein
in reliance upon the authority of said firm as experts in giving said reports.

    With  respect  to  the  unaudited  condensed  financial  information  as  of
September 30, 1993, and for the three month period ended September 30, 1993, the
periods of May 7 through September 30,  1993 and January 1 through May 6,  1993,
and  for the three month and nine month periods ended September 30, 1992, Arthur
Andersen & Co. has  applied limited procedures  in accordance with  professional
standards  for a  review of  that information.  However, their  separate reports
thereon state that they did not audit and they do not express an opinion on that
condensed financial information.  Accordingly, the degree  of reliance on  their
reports  on that information should be restricted in light of the limited nature
of the review procedures applied. In  addition, the accountants are not  subject
to  the liability  provisions of Section  11 of  the Securities Act  of 1933 for
their report  on  the unaudited  condensed  financial information  because  that
report  is not a "report" or a  "part" of the Registration Statement prepared or
certified by the  accountants within the  meaning of  Sections 7 and  11 of  the
Securities Act of 1933.

                             ADDITIONAL INFORMATION

    The  Corporation has filed with the  Securities and Exchange Commission (the
"Commission"  or  the  "SEC")  a   Registration  Statement  on  Form  S-1   (the
"Registration  Statement") (which term shall  encompass all amendments, exhibits
and schedules  thereto)  under the  Securities  Act  of 1933,  as  amended  (the
"Securities  Act"), with respect to the  Common Stock being offered hereby. This
Prospectus does not contain  all the information set  forth in the  Registration
Statement,  certain parts of which are omitted  in accordance with the rules and
regulations of  the Commission,  and to  which reference  is hereby  made.  Such
additional  information  can be  inspected and  copied  at the  public reference
facilities maintained by the Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.W., Washington, D.C.  20549 and at the  following regional offices  of
the  Commission: 500 W. Madison Street, Suite 1400, Chicago, Illinois 60661; and
Seven World Trade Center, New York, New York 10048. Copies of such material  can
be  obtained by  mail from  the public  reference section  of the  Commission at
Judiciary Plaza, 450 Fifth  Street, N.W., Washington,  D.C. 20549 at  prescribed
rates.  Statements made in this  Prospectus as to the  contents of any contract,
agreement or  other document  referred  to are  not necessarily  complete.  With
respect  to each such contract, agreement or  other document filed as an exhibit
to the  Registration Statement,  reference is  made to  the exhibit  for a  more
complete  description of the  matter involved, and each  such statement shall be
deemed qualified in its entirety by such reference.

    The  Corporation  is  subject  to  the  informational  requirements  of  the
Securities  Exchange  Act  of 1934,  as  amended  (the "Exchange  Act"),  and in
accordance therewith,  files periodic  reports and  other information  with  the
Commission.  Such reports  and other information  filed with  the Commission, as
well as the Registration  Statement, can be inspected  and copied at the  public
reference facilities of the

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<PAGE>
Commission  at  450  Fifth Street,  N.W.,  Washington,  D.C. 20549,  and  at the
Commission's regional offices  located at Northwestern  Atrium Center, 500  West
Madison  Street, Suite 1400, Chicago, Illinois 60661-2511, and Seven World Trade
Center, New York, New York 10048. Copies  of such material can also be  obtained
by mail from the Public Reference Section of the Commission at 450 Fifth Street,
N.W.,  Washington,  D.C.  20549, at  prescribed  rates. Such  reports  and other
information with respect to the Corporation are available for inspection at  the
offices  of the New  York Stock Exchange,  Inc., 20 Broad  Street, New York, New
York 10005 and the Chicago Stock Exchange, Inc., One Financial Place, 440  South
LaSalle Street, Chicago, Illinois 60605.

                                      100
<PAGE>
                                USG CORPORATION

                            ------------------------

                         INDEX TO FINANCIAL STATEMENTS

    The  financial statements indexed below and  included on the following pages
have been largely extracted  from the Corporation's 1992  Annual Report on  Form
10-K  dated March 26,  1993 or from  the Corporation's Quarterly  Report on Form
10-Q dated November 11, 1993. Terms with initial capital letters not defined  in
such notes have the meanings ascribed to them in such Form 10-K or Form 10-Q.

    On  May 6, 1993, the Corporation  consummated the Prepackaged Plan, pursuant
to which the Corporation has  implemented the Restructuring described  elsewhere
in  this  Prospectus.  See  "Prospectus Summary"  and  "The  Restructuring." The
Corporation's consolidated financial  statements for periods  subsequent to  the
Restructuring  will reflect  the financial and  accounting adjustments resulting
from the  Restructuring.  The Corporation's  historical  consolidated  financial
statements  for periods before  May 7, 1993  included on Pages  F-1 through F-62
(including the notes thereto,  except as expressly indicated  in such notes)  do
not  reflect the  consummation of  the Restructuring  and should  be reviewed in
conjunction  with   the   information   included  in   this   Prospectus   under
"Capitalization   of  the   Corporation,"  "Pro   Forma  Consolidated  Financial
Information," and "Management's Discussion  and Analysis of Financial  Condition
and Results of Operations."

<TABLE>
<CAPTION>
                                                                                                     PAGE
                                                                                                   ---------
<S>                                                                                                <C>
Consolidated Statement of Earnings -- years ended December 31, 1992, 1991 and 1990...............        F-1
Consolidated Balance Sheet -- as of December 31, 1992 and 1991...................................        F-2
Consolidated Statement of Cash Flows -- years ended December 31, 1992, 1991 and 1990.............        F-3
Significant Accounting Policies and Practices ("notes")..........................................        F-4
Report of Independent Public Accountants.........................................................       F-36
Selected Quarterly Financial Data................................................................       F-37
Comparative Five-Year Summary....................................................................       F-38
Schedule  V -- Property, Plant and Equipment.....................................................       F-39
Schedule  VI -- Accumulated Depreciation and Depletion of Property, Plant and Equipment..........       F-40
Schedule VIII -- Valuation and Qualifying Accounts...............................................       F-41
Schedule  IX -- Short-Term Borrowings............................................................       F-42
Schedule  X -- Supplemental Statement of Earnings Information....................................       F-43
Supplemental Note on Financial Information for United States Gypsum Company......................       F-44
Report of Independent Public Accountants with Respect to Supplemental Note and Financial
 Statement Schedules.............................................................................       F-45
CONDENSED INTERIM FINANCIAL STATEMENTS (UNAUDITED):
Consolidated Statement of Earnings -- three months ended September 30, 1993, May 7 through June
 30, 1993, January 1 through May 6, 1993 and three months and nine months ended September 30,
 1992............................................................................................       F-47
Consolidated Balance Sheet -- as of September 30, 1993 and December 31, 1992.....................       F-48
Consolidated Statement of Cash Flows -- May 7 through September 30, 1993, January 1 through May
 6, 1993 and nine months ended September 30, 1992................................................       F-49
Notes to Consolidated Financial Statements.......................................................       F-50
Reports of Independent Public Accountants........................................................       F-64
</TABLE>

    All  other schedules have been omitted  because they are not applicable, are
not required, or  the information  is included  in the  financial statements  or
notes thereto.

                                      101
<PAGE>
                                USG CORPORATION

                       CONSOLIDATED STATEMENT OF EARNINGS
             (DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER SHARE FIGURES)

<TABLE>
<CAPTION>
                                                                                      YEARS ENDED DECEMBER 31
                                                                                  -------------------------------
                                                                                    1992       1991       1990
                                                                                  ---------  ---------  ---------
<S>                                                                               <C>        <C>        <C>
Net Sales.......................................................................  $   1,777  $   1,712  $   1,915
Cost of products sold...........................................................      1,460      1,385      1,499
                                                                                  ---------  ---------  ---------
Gross Profit....................................................................        317        327        416
Selling and administrative expenses.............................................        218        194        203
Restructuring expenses..........................................................         --         --         18
                                                                                  ---------  ---------  ---------
Operating Profit................................................................         99        133        195
Interest expense................................................................        334        333        292
Interest income.................................................................        (12)       (11)        (8)
Other expense, net..............................................................          1          5          5
Nonrecurring gain...............................................................         --         --        (34)
                                                                                  ---------  ---------  ---------
Loss from Continuing Operations Before Taxes on Income..........................       (224)      (194)       (60)
Income tax benefit..............................................................        (33)       (53)        (6)
                                                                                  ---------  ---------  ---------
Loss from Continuing Operations.................................................       (191)      (141)       (54)
Discontinued Operations:
  Operating earnings, net of taxes..............................................         --         --          5
  Reserve for DAP divestiture, net of taxes.....................................         --        (20)       (41)
                                                                                  ---------  ---------  ---------
Net Loss........................................................................       (191)      (161)       (90)
                                                                                  ---------  ---------  ---------
                                                                                  ---------  ---------  ---------
Loss Per Common Share:
  Continuing operations.........................................................      (3.42)     (2.53)      (.99)
  Discontinued operations.......................................................         --       (.38)      (.66)
                                                                                  ---------  ---------  ---------
Net Loss Per Common Share.......................................................      (3.42)     (2.91)     (1.65)
                                                                                  ---------  ---------  ---------
                                                                                  ---------  ---------  ---------
</TABLE>

THE ACCOUNTING POLICIES AND PRACTICES ON PAGES F-4 THROUGH F-35 ARE AN INTEGRAL
PART OF THIS STATEMENT.

                                      F-1
<PAGE>
                                USG CORPORATION

                           CONSOLIDATED BALANCE SHEET
                          (DOLLAR AMOUNTS IN MILLIONS)

                                     ASSETS

<TABLE>
<CAPTION>
                                                                                               AS OF DECEMBER 31
                                                                                              --------------------
                                                                                                1992       1991
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
Current Assets:
Cash and cash equivalents (primarily time deposits).........................................  $     180  $     155
Receivables (net of reserves of $11 and $9).................................................        299        298
Inventories.................................................................................        113        110
Restricted cash.............................................................................         88         84
                                                                                              ---------  ---------
  Total current assets......................................................................        680        647
                                                                                              ---------  ---------
Property, Plant and Equipment, Net..........................................................        800        819
Purchased Goodwill, Net.....................................................................         69         73
Other Assets................................................................................        110         87
                                                                                              ---------  ---------
  Total assets..............................................................................      1,659      1,626
                                                                                              ---------  ---------
                                                                                              ---------  ---------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable............................................................................         91         95
Accrued interest expense....................................................................        386        178
Other accrued expenses......................................................................        167        162
Notes payable...............................................................................          2          8
Revolving Credit Facility...................................................................        140        140
Long-term debt maturing within one year.....................................................        576        427
Long-term debt classified as current........................................................      1,926      2,009
                                                                                              ---------  ---------
  Total current liabilities.................................................................      3,288      3,019
                                                                                              ---------  ---------
Long-Term Debt..............................................................................         67         76
Deferred Income Taxes.......................................................................        175        200
Minority Interest in CGC....................................................................          9         11
Stockholders' Equity/(Deficit):
Preferred stock -- $1 par value; authorized 36,000,000 shares; $1.80 convertible preferred
 stock (initial series); outstanding -- none................................................         --         --
Common stock -- $0.10 par value; authorized 300,000,000 shares;
 outstanding 55,757,394 shares and 55,770,981 shares (after deducting 368,409 and 354,822
 shares held in treasury)...................................................................          5          5
Capital received in excess of par value.....................................................         23         24
Deferred currency translation...............................................................         (8)        --
Reinvested earnings/(deficit)...............................................................     (1,900)    (1,709)
                                                                                              ---------  ---------
  Total stockholders' equity/(deficit)......................................................     (1,880)    (1,680)
                                                                                              ---------  ---------
  Total liabilities and stockholders' equity................................................      1,659      1,626
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>

THE ACCOUNTING POLICIES AND PRACTICES ON PAGES F-4 THROUGH F-35 ARE AN INTEGRAL
PART OF THIS STATEMENT.

                                      F-2
<PAGE>
                                USG CORPORATION

                      CONSOLIDATED STATEMENT OF CASH FLOWS
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                                                             YEARS ENDED DECEMBER 31
                                                                                         -------------------------------
                                                                                           1992       1991       1990
                                                                                         ---------  ---------  ---------
<S>                                                                                      <C>        <C>        <C>
Cash Flows from Operating Activities:
Loss from continuing operations........................................................  $    (191) $    (141) $     (54)
Reserve for DAP divestiture, net of taxes..............................................         --        (20)       (41)
Adjustments to reconcile loss from continuing operations to net cash:
  Depreciation, depletion and amortization.............................................         66         68         76
  Interest expense on pay-in-kind debentures...........................................         74         63         54
  Deferred income taxes................................................................        (25)       (13)         2
  Net gain on asset dispositions.......................................................         (5)        (3)       (37)
(Increase)/decrease in working capital:
  Receivables..........................................................................         (1)       (16)        (7)
  Inventories..........................................................................         (3)        (7)         6
  Payables.............................................................................         (4)       (14)       (23)
  Accrued expenses.....................................................................        213        132         20
(Increase)/decrease in other assets....................................................        (23)        (9)         3
Increase/(decrease) in minority interest...............................................         (2)        (2)        (1)
Other, net.............................................................................         (9)        (9)        --
                                                                                         ---------  ---------  ---------
  Net cash flows (to)/from operating activities                                                 90         29         (2)
                                                                                         ---------  ---------  ---------
Cash Flows from Investing Activities:
Capital expenditures...................................................................        (49)       (49)       (64)
Net proceeds from asset dispositions...................................................          6          5         65
Net proceeds from divestitures of discontinued operations..............................         --         80         --
                                                                                         ---------  ---------  ---------
  Net cash flows (to)/from investing activities........................................        (43)        36          1
                                                                                         ---------  ---------  ---------
Cash Flows from Financing Activities:
Issuance of debt.......................................................................         57         65         60
Repayment of debt......................................................................        (75)       (68)       (82)
Deposit of restricted cash.............................................................         (4)       (84)        --
Revolving Credit Facility..............................................................         --         --        140
                                                                                         ---------  ---------  ---------
  Net cash flows (to)/from financing activities........................................        (22)       (87)       118
                                                                                         ---------  ---------  ---------
Net Cash Flows (To)/From Discontinued Operations.......................................         --          2         (9)
                                                                                         ---------  ---------  ---------
Net Increase/(Decrease) in Cash and Cash Equivalents...................................         25        (20)       108
                                                                                         ---------  ---------  ---------
Cash and cash equivalents as of January 1..............................................        155        175         67
                                                                                         ---------  ---------  ---------
Cash and cash equivalents as of December 31............................................        180        155        175
                                                                                         ---------  ---------  ---------
                                                                                         ---------  ---------  ---------
Supplemental Cash Flow Disclosures:
Interest paid..........................................................................         52        154        275
Income taxes paid......................................................................         13         15         27
                                                                                         ---------  ---------  ---------
                                                                                         ---------  ---------  ---------
</TABLE>

THE ACCOUNTING POLICIES AND PRACTICES ON PAGES F-4 THROUGH F-35 ARE AN INTEGRAL
PART OF THIS STATEMENT.

                                      F-3
<PAGE>
                                USG CORPORATION
                 SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES

PRINCIPLES OF CONSOLIDATION

    The   consolidated  financial   statements  include  the   accounts  of  the
Corporation and its subsidiaries after elimination of intercompany accounts  and
transactions.  Revenue is recognized upon the shipment of products. Net currency
translation gains or losses on foreign subsidiaries, except for those in Mexico,
are included  in deferred  currency translation,  a component  of  stockholders'
equity.  Mexican currency translation losses  are charged to earnings. Purchased
goodwill is being amortized over a period of 40 years.

    For purposes of the Consolidated Balance Sheet and Statement of Cash  Flows,
all  highly liquid investments  with a maturity  of three months  or less at the
time of purchase are considered to be cash equivalents.

FINANCIAL RESTRUCTURING

    On January  22, 1993,  the  Corporation announced  that  it had  reached  an
agreement in principle with all committees and certain institutions representing
debt  subject to  the Restructuring  on the terms  of the  Prepackaged Plan. The
Corporation received  signed  letters  from these  committees  and  institutions
indicating  that they support or  do not object to  the terms of the Prepackaged
Plan, and  signed Commitment  Letters from  100%  of its  31 member  Bank  Group
approving  the terms  of an  Amended Credit  Agreement, the  major provisions of
which are summarized below. On February 5, 1993, the Corporation's  Registration
Statement  bearing  Registration  No. 33-40136,  which  included  the Disclosure
Statement detailing the terms of the Prepackaged Plan, was declared effective by
the SEC. Solicitation of approvals of the Prepackaged Plan was then carried  out
and completed on March 15, 1993.

    The  following summary  of the major  provisions of the  Prepackaged Plan is
qualified in  its  entirety  by  reference  to  the  more  detailed  information
appearing in the Disclosure Statement, including the Plan of Reorganization.

    (1)  The Prepackaged Plan provides for a one-for-50 reverse stock split (the
"REVERSE  STOCK SPLIT") to be effected  immediately prior to the distribution of
new common stock (the "NEW COMMON  STOCK") pursuant to the Prepackaged Plan.  On
the  date of consummation of the  Prepackaged Plan (the "EFFECTIVE DATE"), after
giving effect to the Reverse Stock  Split, the following distributions would  be
made to holders of the Old Subordinated Debentures:

       -  For  each $1,000  principal amount  of Old  Senior Subordinated
       Debentures (excluding  accrued  interest thereon,  which  will  be
        cancelled),  the holder will  receive 50.81 shares  of New Common
        Stock.

       - For  each $1,000  principal amount  of Old  Junior  Subordinated
       Debentures  (excluding  accrued  interest thereon,  which  will be
        cancelled), the holder  will receive 11.61  shares of New  Common
        Stock  and 5.42 warrants  (the "NEW WARRANTS"),  each to purchase
        one share of New Common Stock.

    Existing stockholders will retain their  shares of common stock, subject  to
the  Reverse Stock Split and the issuance of  New Common Stock to holders of the
Old Subordinated Debentures under the Prepackaged Plan.

    Under the Prepackaged Plan, there will be approximately 37.2 million  shares
of New Common Stock outstanding on the Effective Date, of which the common stock
held  by existing  stockholders would  represent approximately  3% of  the total
number of outstanding  shares. If all  of the New  Warrants were exercised,  the
aggregate  holdings  of Old  Senior Subordinated  Debenture holders,  Old Junior
Subordinated Debenture holders and existing stockholders would represent  76.7%,
20.6%  and 2.7%, respectively, of the total  number of outstanding shares of New
Common Stock.

                                      F-4
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    (2)  For each $1,000 principal amount  of Old Senior 1991 Notes, the  holder
will  receive $750 principal amount of 8% senior notes due 1995 (the "NEW SENIOR
1995 NOTES") and $250  principal amount of  9% senior notes  due 1998 (the  "NEW
SENIOR  1998  NOTES").  In  addition, the  Corporation  will  issue  $10 million
principal amount of the  New Senior 1998 Notes  to two institutional holders  of
existing  8% senior notes due 1996 (the "OLD SENIOR 1996 NOTES") in exchange for
an equal principal amount thereof.  The New Senior 1995  and 1998 Notes will  be
secured,  with certain  other indebtedness of  the Corporation and  subject to a
collateral trust  arrangement  controlled primarily  by  holders of  the  Banks'
claims,  by first  priority security interests  in the capital  stock of certain
subsidiaries of the Corporation.

    (3)  The Prepackaged  Plan provides for the  following modifications to  the
Current  Credit  Agreement (the  Current Credit  Agreement,  as modified  by the
Prepackaged Plan, is  referred to  as the  "AMENDED CREDIT  AGREEMENT"): (i)  an
option  to exchange on the Effective Date up  to $300 million (but not less than
$100 million) of principal on the Bank Term Loan and a pro rata amount (of up to
$24 million) of accrued but  unpaid interest on the Bank  Term Loan for 10  1/4%
senior notes due 2002 (the "NEW 10 1/4% SENIOR NOTES"); (ii) extending the final
maturity  of the remaining principal outstanding on the Bank Term Loan from 1996
to 2000  and deferring  all scheduled  principal payments  until December  1994;
(iii)  capitalizing up  to $75 million  (or $48  million if the  election in (i)
above is fully subscribed) in interest  originally due on or after December  31,
1991 into notes bearing annual interest at LIBOR plus 2 1/4% (or Citibank's base
rate plus 1 1/4%) and maturing in the years 1998 and 2000; (iv) making available
(at  the  Corporation's  option  but  subject  to  certain  limitations  on  the
availability of LIBOR) an annual interest rate applicable to the Bank Term  Loan
and  an extended revolving credit  facility of LIBOR plus  1 7/8% (or Citibank's
base rate plus 7/8%), with the option to capitalize the amount of such  interest
in  excess of  LIBOR plus  1% per  annum (such  capitalized interest  would bear
interest annually at LIBOR plus 2 1/4% (or Citibank's base rate plus 1 1/4%) and
mature in the years 1998 and 2000); (v) providing for an excess cash flow  sweep
that  will take into  account certain liquidity thresholds  and that will retire
the Bank Term Loan earlier than 2000 if the Corporation meets or exceeds current
projections; (vi) suspending all financial covenants through January 1, 1995 and
providing for new  covenants thereafter;  (vii) extending to  1998 the  maturity
date of, and establishing a maximum borrowing capacity of $175 million under the
Revolving   Credit  Facility,  including   a  $110  million   letter  of  credit
subfacility; and (viii) exchanging (at the option of the holders thereof) up  to
approximately  $16 million  owed in connection  with certain  interest rate swap
contracts for an equal principal amount of New 10 1/4% Senior Notes or Bank Term
Loans (provided that in the event that no New 10 1/4% Senior Notes are issued in
the Restructuring, such $16 million shall be exchanged for Bank Term Loans)  and
exchanging  approximately $5  million in  additional amounts  owed in connection
with such  interest  rate  swap  contracts for  an  equal  principal  amount  of
capitalized  interest notes. Under  the Prepackaged Plan,  all existing defaults
and accrued default interest as of  the Effective Date under the Current  Credit
Agreement will be waived or cancelled.

    (4)   The  Corporation has  arranged a  receivables financing  facility (the
"INTERIM RECEIVABLES FINANCING  FACILITY") for  use during the  Chapter 11  Case
utilizing  the proceeds,  and interest received  thereon, from the  sale of DAP,
which the Banks approved in a further amendment to the Current Credit Agreement.
In connection with the  Interim Receivables Financing  Facility, subject to  the
terms  and  conditions  of  an  order of  the  Bankruptcy  Court,  including the
satisfaction of certain  financial tests  concerning minimum  cash balances  and
interest  coverage ratios, the Corporation will pay current interest on the Bank
Debt (at the same nondefault rate set forth in the Prepackaged Plan) and on  the
Old  Senior 1991 Notes and  its other senior debt  securities (at the applicable
nondefault contract rates). If such interest is not so paid during the  pendency
of  the  Chapter 11  Case, because  the  Corporation is  unable to  continue the
Interim Receivables  Financing Facility  for any  reason, the  Prepackaged  Plan
provides  for payment of such interest in cash on the effective date at the base
rate option referred to above as applicable to the Bank Term Loan.

                                      F-5
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    (5)  The Prepackaged Plan  also includes or is  based in part on  provisions
relating  to  (i)  the  selection  of five  new  directors  to  be  nominated by
representatives of certain  creditors; (ii) the  settlement of certain  employee
compensation arrangements; and (iii) the release of certain potential claims.

    In  connection with the  pending Restructuring efforts,  the Corporation has
deferred certain principal and interest  payments in order to maintain  adequate
liquidity  during the Restructuring process.  These payment deferrals constitute
defaults under  the  applicable loan  agreements  and indentures,  which  remain
uncured  or unwaived  as of the  date of this  report, but are  addressed in the
Prepackaged Plan.  See  the  Indebtedness footnote  for  additional  information
relating  to the default condition,  including arrearage as of  the date of this
report.

RESTRUCTURING EXPENSES

    In the  fourth quarter  of  1990, restructuring  expenses amounting  to  $18
million  were  recorded,  primarily for  the  implementation of  a  program that
improved operating efficiencies  in each of  the Corporation's businesses.  This
program  contributed to the elimination of over 550 positions in 1990 as certain
corporate and subsidiary  staff functions  were combined to  service the  entire
organization.  Expenses  associated  with the  elimination  of  these positions,
combined  with  expenses  for  related  real  estate  activities  such  as   the
consolidation  of certain locations and termination of several lease agreements,
accounted for approximately 80% of total restructuring expenses.

    Costs  of  $19  million  and  $14   million  incurred  in  1992  and   1991,
respectively,  related to the Corporation's  Prepackaged Plan have been deferred
and are included in other assets in the Consolidated Balance Sheet.

NONRECURRING GAIN

    In the first quarter of 1990, a nonrecurring pre-tax gain of $34 million was
recorded on the  sale of the  Corporation's headquarters building  at 101  South
Wacker  Drive in Chicago. This gain was calculated after deducting $9 million as
a reserve against which lease payments  made by the Corporation while  occupying
the  101 South Wacker facility were charged. The Corporation leased office space
in this building until its move to new leased offices in mid-1992. The net  cash
proceeds  from this transaction  were used to  repay debt and  for other general
corporate purposes.

DISCONTINUED OPERATIONS

    Results for DAP are set forth  separately as discontinued operations in  the
accompanying  consolidated financial statements and supplementary data schedules
up to the date of its disposition.

    In the fourth  quarter of 1990,  the Board of  Directors of the  Corporation
(the  "BOARD") authorized  the divestiture  of DAP.  At that  time, an after-tax
provision of  $41  million  for  its  planned  disposition  was  recorded.  This
provision  was net of a related income tax  benefit of $2 million. In the second
quarter of 1991, the Corporation  absorbed an additional after-tax provision  of
$20  million, which was net  of a related income tax  expense of $8 million. The
sale of the business and substantially all of the assets of DAP was completed on
September 20, 1991 with the Corporation receiving gross proceeds of $90 million.
Net proceeds  from the  transaction amounted  to approximately  $84 million.  In
connection  with the execution of the DAP sale agreement, the Banks consented to
the sale as required under the Current Credit Agreement subject to an  agreement
by  the Corporation and DAP to deposit the proceeds in a bank account to be held
exclusively for use in the Restructuring. As a result, these funds, and interest
earned on these funds, are being maintained on an interim basis in a  restricted
bank  account pending  their use in  connection with the  Restructuring and have
been classified  as restricted  cash in  the accompanying  Consolidated  Balance
Sheet. The deposit arrangements generally provide that amounts in the restricted
account  shall  be  invested  in  high  quality,  short-term  investments. These
arrangements

                                      F-6
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
have been  amended  by  the  agreements  implementing  the  Interim  Receivables
Financing  Facility described in the Financial Restructuring footnote above. The
DAP proceeds will subsequently be used in the implementation of the  Prepackaged
Plan, if confirmed and made effective.

    Net  sales  of discontinued  operations amounted  to  $128 million  and $179
million in  1991 and  1990,  respectively. Taxes  on  income for  the  operating
results of discontinued operations amounted to $1 million and $4 million in 1991
and 1990, respectively.

RESEARCH AND DEVELOPMENT

    Research  and development expenditures  are charged to  earnings as incurred
and amounted to $14 million, $12 million and $14 million in 1992, 1991 and 1990,
respectively.

TAXES ON INCOME AND DEFERRED INCOME TAXES

    Earnings/(loss) from continuing operations before taxes on income  consisted
of the following:

<TABLE>
<CAPTION>
                                                                       1992       1991       1990
                                                                     ---------  ---------  ---------
<S>                                                                  <C>        <C>        <C>
                                                                      (DOLLAR AMOUNTS IN MILLIONS)
U.S................................................................  $    (246) $    (217) $    (100)
Foreign............................................................         22         23         40
                                                                     ---------  ---------  ---------
Total..............................................................       (224)      (194)       (60)
                                                                     ---------  ---------  ---------
                                                                     ---------  ---------  ---------
</TABLE>

    Taxes on income/(income tax benefit) consisted of the following:

<TABLE>
<CAPTION>
                                                                       1992       1991       1990
                                                                     ---------  ---------  ---------
<S>                                                                  <C>        <C>        <C>
                                                                      (DOLLAR AMOUNTS IN MILLIONS)
Current:
  U.S. Federal.....................................................  $     (12) $     (53) $     (26)
  Foreign..........................................................          6         12         16
                                                                     ---------  ---------  ---------
                                                                            (6)       (41)       (10)
                                                                     ---------  ---------  ---------
Deferred:
  U.S. Federal.....................................................        (27)       (11)         5
  Foreign..........................................................         --         (1)        (1)
                                                                     ---------  ---------  ---------
                                                                           (27)       (12)         4
                                                                     ---------  ---------  ---------
Total..............................................................        (33)       (53)        (6)
                                                                     ---------  ---------  ---------
                                                                     ---------  ---------  ---------
</TABLE>

    Deferred  income taxes result  from certain items  being treated differently
for financial reporting purposes than for income tax purposes. The tax effect of
such differences is summarized as follows:

<TABLE>
<CAPTION>
                                                                       1992       1991       1990
                                                                     ---------  ---------  ---------
<S>                                                                  <C>        <C>        <C>
                                                                      (DOLLAR AMOUNTS IN MILLIONS)
Tax benefit carryforwards..........................................  $     (19) $      (9) $      --
Accelerated tax depreciation.......................................         (5)        --          2
Other, net.........................................................         (3)        (3)         2
                                                                     ---------  ---------  ---------
Total deferred provision...........................................        (27)       (12)         4
Classification adjustment of prior years' deferrals................          2         (1)        (2)
                                                                     ---------  ---------  ---------
Increase/(decrease) in deferred taxes..............................        (25)       (13)         2
                                                                     ---------  ---------  ---------
                                                                     ---------  ---------  ---------
</TABLE>

    Tax benefit  carryforwards  in 1992  consisted  of  $19 million  on  an  NOL
Carryforward of $140 million for U.S. regular tax purposes (which may be used to
offset future taxable income through 2007).

                                      F-7
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
Additional  tax  benefit  carryforwards consist  of  $5  million on  a  1991 NOL
Carryforward of $14 million (which may  be used to offset future taxable  income
through  2006) and a  $3 million 1988  minimum tax credit  which is available to
offset U.S. regular tax liability in future years.

    The Internal Revenue Code will either substantially limit the  Corporation's
annual use of, or substantially reduce, its NOL Carryforwards after consummation
of  the Prepackaged  Plan. If  the Corporation  is required  to reduce  all or a
portion of its unused NOL Carryforwards due to the cancellation of  indebtedness
from  the Prepackaged Plan, annual reductions in U.S. Federal income taxes which
would otherwise  result  from  use  of these  NOLs  after  consummation  of  the
Prepackaged  Plan would no longer be available. The Corporation believes that if
its NOLs are not reduced by such  cancellation of indebtedness, it will be  able
to use approximately $20 million of the NOLs each year to offset federal taxable
income otherwise occurring after consummation of the Prepackaged Plan.

    The  difference between the  statutory U.S. Federal  income tax benefit rate
and the  Corporation's  effective  income  tax benefit  rate  is  summarized  as
follows:

<TABLE>
<CAPTION>
                                                                             1992         1991         1990
                                                                          -----------  -----------  -----------
<S>                                                                       <C>          <C>          <C>
Statutory U.S. Federal income tax benefit rate..........................      (34.0)%      (34.0)%      (34.0)%
NOL carryback rate differential.........................................       (0.9)        (1.1)        (6.2)
Excess tax depletion....................................................       (0.9)        (1.2)        (4.6)
Intangible asset amortization...........................................        0.3          0.4          1.5
Foreign tax rate differential...........................................        7.7          8.3         30.4
State and local taxes on income, net....................................        0.1          0.1          0.2
Unbenefited NOL Carryforward............................................       12.6            --        --
Other, net..............................................................         0.1           --          2.9
                                                                               -----        -----        -----
Effective income tax benefit rate.......................................       (15.0 )      (27.5 )       (9.8 )
                                                                               -----        -----        -----
                                                                               -----        -----        -----
</TABLE>

    The  Corporation  does not  provide  for U.S.  Federal  income taxes  on the
portion of undistributed earnings of foreign subsidiaries which are intended  to
be  permanently reinvested. The cumulative amount of such undistributed earnings
totaled approximately $53 million as  of December 31, 1992. Future  repatriation
of  undistributed earnings  would not, in  the opinion of  management, result in
significant additional taxes.

    In February 1992, the Financial  Accounting Standards Board ("FASB")  issued
Statement  of Financial Accounting  Standards ("SFAS") No.  109, "Accounting for
Income Taxes," requiring the Corporation to change its method of accounting  for
income  taxes to an asset and liability approach. The Corporation will implement
the new standard in 1993. The estimated  impact of adoption will be an  increase
to  net earnings of approximately $30  million, with a corresponding decrease in
deferred taxes. Adoption of the standard will have no impact on cash flow.

EARNINGS/(LOSS) PER SHARE

    Earnings/(loss) per share  are computed by  dividing earnings/(loss),  after
deducting  preferred stock cash dividends when applicable, by the average number
of shares  of  common stock  outstanding,  including shares  issuable  upon  the
exercise of stock options when applicable.

INVENTORIES

    Most  of the Corporation's domestic and Mexican inventories are valued under
the last-in, first-out  ("LIFO") method.  The LIFO values  of these  inventories
were $72 million and $66 million as of December 31, 1992 and 1991, respectively.
The  remaining inventories  are stated at  a lower  of cost or  market under the
first-in, first-out  ("FIFO") or  average production  cost methods.  Inventories
include material, labor and applicable factory overhead costs.

                                      F-8
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    If  all inventories were  valued under the FIFO  and average production cost
methods, inventories would have been $25  million higher than those reported  as
of both December 31, 1992 and 1991. Inventory classifications were as follows:

<TABLE>
<CAPTION>
                                                                                     12/31/92     12/31/91
                                                                                    -----------  -----------
<S>                                                                                 <C>          <C>
                                                                                       (DOLLAR AMOUNTS IN
                                                                                           MILLIONS)
Finished goods and work-in-process................................................   $      66    $      64
Raw materials.....................................................................          40           39
Supplies..........................................................................           7            7
                                                                                         -----        -----
Total.............................................................................         113          110
                                                                                         -----        -----
                                                                                         -----        -----
</TABLE>

    The  LIFO value  of USG Interiors'  inventories acquired  under the purchase
method exceeded that computed for U.S. Federal income tax purposes by $6 million
as of both December 31, 1992 and 1991.

PROPERTY, PLANT AND EQUIPMENT

    Property,  plant   and  equipment,   including  significant   renewals   and
improvements,   are  capitalized  at  cost.   Provisions  for  depreciation  are
determined principally on a straight-line basis over the expected average useful
lives of composite asset groups. Depletion is computed on a basis calculated  to
spread  the cost  of gypsum  and other  applicable resources  over the estimated
quantities of material recoverable. Interest during construction is  capitalized
on  major property additions. Property, plant and equipment classifications were
as follows:

<TABLE>
<CAPTION>
                                                                                     12/31/92     12/31/91
                                                                                    -----------  -----------
<S>                                                                                 <C>          <C>
                                                                                       (DOLLAR AMOUNTS IN
                                                                                           MILLIONS)
Land and mineral deposits.........................................................   $      41    $      41
Buildings and realty improvements.................................................         401          402
Machinery and equipment...........................................................       1,012        1,000
                                                                                    -----------  -----------
                                                                                         1,454        1,443
Reserves for depreciation and depletion...........................................        (654)        (624)
                                                                                    -----------  -----------
Total.............................................................................         800          819
                                                                                    -----------  -----------
                                                                                    -----------  -----------
</TABLE>

LEASES

    The Corporation  leases certain  of its  offices, buildings,  machinery  and
equipment,  and autos under  noncancellable operating leases.  These leases have
various terms and renewal  options. Lease expense amounted  to $31 million,  $26
million and $24 million in 1992, 1991 and 1990, respectively.

    Future minimum lease payments, by year and in the aggregate, under operating
leases  with initial or remaining noncancellable terms  in excess of one year as
of December 31, 1992 are as follows:

<TABLE>
<CAPTION>
                                                                           MINIMUM LEASE
                                                                             PAYMENTS
                                                                   -----------------------------
<S>                                                                <C>
                                                                   (DOLLAR AMOUNTS IN MILLIONS)
1993.............................................................            $      23
1994.............................................................                   21
1995.............................................................                   15
1996.............................................................                   11
1997.............................................................                    8
Thereafter.......................................................                   42
                                                                                 -----
Aggregate minimum payments.......................................                  120
                                                                                 -----
                                                                                 -----
</TABLE>

                                      F-9
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    The Corporation also holds certain assets under capital leases. These  lease
obligations are not material.

INDEBTEDNESS

    Total debt consisted of the following:

<TABLE>
<CAPTION>
                                                                                 12/31/92          12/31/91
                                                                          ----------------------  -----------
                                                                           CARRYING      FAIR      CARRYING
                                                                            AMOUNT       VALUE      AMOUNT
                                                                          -----------  ---------  -----------
<S>                                                                       <C>          <C>        <C>
                                                                             (DOLLAR AMOUNTS IN MILLIONS)
SECURED DEBT:
Bank Debt:
  Bank Term Loan, installments due through 1996.........................   $     840   $     N/A   $     840
  Revolving Credit Facility.............................................         140         N/A         140
Senior notes:
  Old Senior 1991 Notes, 7.375%, due 1991...............................         100          84         100
  Old Senior 1996 Notes, 8.0%, due 1996.................................         100          85         100
  8.0%, due 1997........................................................         100          85         100
Senior debentures:
  7.875%, due 2004, sinking fund through 2003...........................          41         N/A          45
  8.75%, due 2017, sinking fund commencing 1998.........................         200         138         200
Other secured debt, average interest rate 10.9%, varying payments
 through 1999...........................................................          37         N/A          55
UNSECURED DEBT:
Industrial revenue bonds, 5.9% -- 10.25%, due through 2014..............          38          34          38
Old Subordinated Debentures:
  Old Senior Subordinated Debentures, 13.25%, due 2000, sinking fund of
   $300 million due 1999................................................         600         204         600
  Old Junior Subordinated Debentures, 16.0%, due 2008, sinking fund
   commencing 2004......................................................         515          49         442
                                                                          -----------             -----------
Total...................................................................       2,711                   2,660
                                                                          -----------             -----------
                                                                          -----------             -----------
</TABLE>

    As  of December  31, 1992, the  Corporation and its  subsidiaries had $2,711
million of total debt (including currently maturing debt, but excluding  accrued
interest)  on a consolidated basis. Of such total debt, $255 million represented
direct borrowings  by  the subsidiaries,  including  $37 million  in  industrial
revenue  bonds, $41  million in  7.875% sinking  fund debentures  issued by U.S.
Gypsum in  1974 and  subsequently assumed  by  the Corporation  on a  joint  and
several  basis  in  1985,  $33 million  in  debt  (primarily  project financing)
incurred by the Corporation's foreign subsidiaries other than CGC, $2 million in
working capital borrowings by CGC, $140  million in borrowings by USG  Interiors
under  the  Revolving Credit  Facility and  $2 million  in other  domestic notes
payable.

    Subject to  SFAS  No.  107,  "Disclosures  about  Fair  Value  of  Financial
Instruments,"  the Corporation  is required to  report the amounts  at which its
debt securities  could be  exchanged in  a current  transaction between  willing
parties,  other than in a  forced or liquidation sale.  The fair values shown in
the table above are based on indicative bond prices as of December 31, 1992.  It
is  not practicable to estimate the fair value of: (i) the bank debt since there
is no active  market for such  debt due  to the Restructuring;  (ii) the  7.875%
senior  debentures due 2004 since  virtually all such debentures  are owned by a
single investment  group;  and (iii)  the  other secured  debt  which  primarily
represents  financing for  construction of  the Aubange,  Belgium plant  that is
secured by a direct lien on its assets.

    As a result of the Bank Term Loan principal payment default on December  31,
1990,  the outstanding balance of the Bank Term Loan was reclassified to current
liabilities as of that date. Most of the

                                      F-10
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
Corporation's long-term  debt agreements  contain cross-acceleration  provisions
which  accelerate the due dates of  substantially all of the Corporation's debt,
generally if there occurs an acceleration of $50 million or more of other  debt.
As  of the  date of this  report, there has  been no demand  for acceleration of
maturity of any of the Corporation's  debt issues. However, demand can be  made,
subject to any applicable notice periods and cure procedures, if an acceleration
resulting  from the defaults described below for either the Bank Debt or the Old
Subordinated Debentures occurs. Accordingly, virtually all long-term debt issues
were reclassified to current liabilities as of December 31, 1990.

    Aggregate, presently scheduled maturities  of long-term debt, excluding  the
amounts  classified  as  current liabilities,  are  $8 million,  $7  million, $9
million and $11 million for the four years 1994 through 1997, respectively.

    DEFAULTS UPON SENIOR SECURITIES

    The Corporation failed  to make Bank  Term Loan principal  payments of  $105
million  due on December 31, 1990, $30 million each due on June 30 and September
30, 1991, $55 million due on June 30, 1992 and $100 million due on December  31,
1992.  The Corporation  has been  notified by  the administrative  agent for the
Banks under the Current Credit Agreement that it is in default by reason of such
failures to pay. This default is continuing  as of the date of this report.  The
Corporation  also deferred  its scheduled  quarterly Bank  Debt Interest  of $25
million due by December 31, 1991, $24 million due by March 31, 1992, $25 million
due by June 30, 1992, and $17 million each due by September 30 and December  31,
1992.  This  default  is also  continuing  as of  the  date of  this  report. In
connection with the  sale of the  business and assets  of the Corporation's  DAP
subsidiary, the failure to pay to the Banks, as a mandatory principal repayment,
an  amount equal  to the  net proceeds of  the DAP  sale upon  completion of the
transaction constitutes  a  further payment  default  under the  Current  Credit
Agreement which remains uncured or unwaived. Also, a mandatory principal payment
of  approximately $8 million  representing net proceeds of  assets sales was not
paid to  the Banks  within one  day of  the July  16, 1991  date of  receipt  of
proceeds exceeding an aggregate of $5 million. This payment default also remains
uncured or unwaived.

    In  connection with the notice of the first Bank Term Loan principal payment
default described above, the Corporation was also advised that the interest rate
under the  Current Credit  Agreement for  the  Bank Debt  would be  adjusted  to
reflect  a default rate, which is the  Banks' base rate under the Current Credit
Agreement plus two  points, so long  as the default  is continuing. The  average
rate  of  interest  on  the  Bank Debt,  including  the  cost  of  interest rate
protection and  two points  for Default  Interest, was  11.3% during  1992.  The
Corporation  unilaterally determined not to pay  Default Interest, but to accrue
Default Interest as  a current liability  which will  be waived as  part of  the
Restructuring. This default is continuing as of the date of this report.

    By  reason of the Corporation's failure to make the Bank Term Loan principal
payment on December 31, 1990, the Corporation  also is not in compliance with  a
covenant  under the Current  Credit Agreement requiring  it to maintain interest
rate contracts at  certain levels  to hedge  against increases  in the  variable
interest rates under the Current Credit Agreement. This default is continuing as
of  the  date  of  this  report.  In addition,  as  of  December  31,  1990, the
Corporation was not in compliance  with financial covenants related to  interest
coverage,  debt leverage and  consolidated net worth (all  as defined) under the
Current Credit  Agreement which  constitute additional  defaults thereunder  and
such noncompliance continues as of the date of this report.

    The  Revolving  Credit  Facility  portion of  the  Current  Credit Agreement
contains a requirement that  the borrowings under that  facility not exceed  $75
million  for a period of thirty consecutive days during the course of any twelve
month period. As of October 16, 1991, the Corporation was not in compliance with
this requirement.  This  noncompliance  constitutes another  default  under  the
Current  Credit Agreement, which remains uncured and  unwaived as of the date of
this report.

                                      F-11
<PAGE>
                                USG CORPORATION
           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    The total arrearage (principal and interest) to the Banks as of the date  of
this  report with respect to  the foregoing defaults was  $531 million, of which
$40 million was accrued default interest which will be waived.

    As a consequence of the Bank Term Loan principal payment default on December
31, 1990, the  Banks took action  as permitted  by the terms  of the  applicable
indenture  to  block the  interest payment  (approximately  $40 million)  due on
January 15,  1991 to  holders  of the  Old  Senior Subordinated  Debentures.  On
February  15, 1991, the failure to make such interest payment became an event of
default under the applicable indenture. Payments of subsequent accrued  interest
of  approximately  the same  amount  were similarly  blocked  on July  15, 1991,
January 15 and July 15, 1992 and January 15, 1993. Such defaults continue as  of
the  date of  this report.  Under the  applicable indenture,  interest on unpaid
interest accrues  at the  rate borne  by the  debentures to  the extent  lawful.
Pursuant  to  the applicable  indenture, total  arrearage  with respect  to this
default as of the date of this report was $230 million.

    On December  16, 1991,  the  Corporation failed  to  make a  final  maturity
principal  payment of $100 million to the  holders of Old Senior 1991 Notes. The
failure to  make  such payment  is  an event  of  default under  the  applicable
indenture  which is continuing  as of the  date of this  report. Pursuant to the
applicable indenture, the total arrearage with respect to this default as of the
date of this report was $100 million. The Corporation intends to continue to pay
interest on the Old Senior 1991 Notes during the Restructuring process,  subject
to appropriate court orders during the bankruptcy proceeding itself.

    On  January  15, 1993,  the Corporation  did not  make the  in-kind interest
payment due to holders of the Old Junior Subordinated Debentures. The failure to
make such interest payment constituted an event of default under the  applicable
indenture  upon the expiration  of a 30-day  grace period on  February 14, 1993.
Such default continues as of the date of this report. Pursuant to the applicable
indenture, total arrearage with respect to this  default as of the date of  this
report  was $40 million. The Corporation does  not intend to make any subsequent
interest payments thereon.

    Under the provisions of the Prepackaged Plan, all existing defaults and,  in
the  case  of  the Old  Subordinated  Debentures accrued  interest,  and Default
Interest on the Bank Debt will be waived or cancelled.

    OTHER INDEBTEDNESS INFORMATION

    The Bank Debt and other secured debt are  secured by a pledge of all of  the
shares  of the Corporation's  major domestic subsidiaries and  65% of certain of
its foreign subsidiaries including  CGC. The rights of  the Corporation and  its
creditors,  including  the  holders  of  the  Old  Senior  1991  Notes  and  Old
Subordinated Debentures, to realize upon the  assets of any subsidiary upon  the
latter's  liquidation or reorganization  will be subject to  the prior claims of
such subsidiary's  creditors, except  to  the extent  that the  Corporation  may
itself be a creditor with enforceable claims against such subsidiary.

    The  7.875% sinking fund  debentures had remaining  principal amounts of $41
million and $45 million as of December 31, 1992 and 1991, respectively.

    The "Other  Secured  Debt"  category  shown in  the  table  above  primarily
includes  short-term and long-term borrowings from  several foreign banks by USG
International used principally to finance  construction of the Aubange,  Belgium
plant.  This debt is secured by a lien on the assets of the Aubange facility and
has restrictive  covenants that  restrict, among  other things,  the payment  of
dividends. Foreign borrowings made by the Corporation's international operations
are  generally allowed, within  certain limits, under  provisions of the Current
Credit Agreement.

                                      F-12
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    The Old Senior Subordinated Debentures are redeemable in whole or in part at
the  Corporation's option at any time on or after July 15, 1993, initially at $5
over the  stated  face amount  and  thereafter at  declining  redemption  prices
together with accrued interest.

    Under  provisions of the Current Credit  Agreement, the Corporation must pay
interest semiannually on  the Old Junior  Subordinated Debentures in  additional
Old  Junior Subordinated Debentures  for the first five  years after issuance in
July 1988. Thereafter, interest is payable in cash. However, as noted above  the
Corporation  did not make the  in-kind interest payment on  January 15, 1993 and
does not  intend  to make  any  subsequent  in-kind or  cash  interest  payments
thereon.  Commencing July 15, 1990, the  Old Junior Subordinated Debentures were
redeemable at the Corporation's option at any time at 100% of stated face amount
plus accrued interest.

    The  Current  Credit  Agreement  also  restricts,  and  the  Amended  Credit
Agreement, if made effective, will continue to restrict, among other things, the
incurrence of additional indebtedness, mergers, asset dispositions, investments,
prepayment  of  other  debt,  dealings  with  affiliates,  capital expenditures,
payment of dividends and lease commitments.

PENSION PLANS AND OTHER POST-EMPLOYMENT BENEFITS

    The Corporation and most of its subsidiaries have defined benefit retirement
plans for all eligible employees. Benefits  of the plans are generally based  on
years   of  service  and  employees'  compensation  during  the  last  years  of
employment.  The  Corporation's  contributions  are  made  in  accordance   with
independent actuarial reports which, for most plans, required minimal funding in
1992,  1991 and 1990. Net pension expense/(benefit) for these years included the
following components:

<TABLE>
<CAPTION>
                                                                     1992       1991       1990
                                                                   ---------  ---------  ---------
                                                                    (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                <C>        <C>        <C>
Service cost-benefits earned during the year.....................  $       9  $       5  $       5
Interest cost on projected benefit obligation....................         29         29         29
Actual return on plan assets.....................................        (14)       (79)        (4)
Unrecognized prior service cost..................................          2          2          2
Net amortization/(deferral)......................................        (25)        41        (34)
                                                                         ---        ---        ---
Net pension expense/(benefit)....................................          1         (2)        (2)
                                                                         ---        ---        ---
                                                                         ---        ---        ---
</TABLE>

                                      F-13
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    The pension plan assets, which consist primarily of listed common stocks and
debt securities, have an estimated fair value in excess of the projected benefit
obligation  as  of   December  31,   1992.  The  following   table  presents   a
reconciliation of the total assets of the pension plans to the projected benefit
obligation.

<TABLE>
<CAPTION>
                                                                  12/31/92     12/31/91
                                                                 -----------  -----------
                                                                    (DOLLAR AMOUNTS IN
                                                                        MILLIONS)
<S>                                                              <C>          <C>
Amount of assets available for benefits:
  Funded assets of the plans at fair value.....................   $     383    $     404
  Accrued pension expense......................................          15           16
                                                                      -----        -----
Total assets of the plans......................................         398          420
                                                                      -----        -----
Present value of estimated pension obligation:
  Vested benefits..............................................         252          256
  Nonvested benefits...........................................          18           21
                                                                      -----        -----
Accumulated benefit obligation.................................         270          277
Additional benefits based on projected future salary
 increases.....................................................          66           63
                                                                      -----        -----
Projected benefit obligation...................................         336          340
                                                                      -----        -----
Assets in excess of projected benefit obligation...............          62           80
                                                                      -----        -----
                                                                      -----        -----
</TABLE>

    Assets in excess of projected benefit obligation consisted of:

<TABLE>
<CAPTION>
                                                                  12/31/92     12/31/91
                                                                 -----------  -----------
                                                                    (DOLLAR AMOUNTS IN
                                                                        MILLIONS)
<S>                                                              <C>          <C>
Net assets existing at the date of adoption of SFAS No. 87 not
 yet recognized................................................   $      32    $      37
Unrecognized net gain due to changes in assumptions and
 differences between actual and estimated experience...........          43           57
Unrecognized cost of retroactive benefits granted by plan
 amendments....................................................         (13)         (14)
                                                                      -----        -----
Assets in excess of projected benefit obligation...............          62           80
                                                                      -----        -----
                                                                      -----        -----
</TABLE>

    The  expected long-term rate of  return on plan assets  was 9% for both 1992
and 1991. To determine  the actuarial present value  of the accumulated  benefit
obligation as of December 31, 1992 and 1991, a weighted average discount rate of
9%  was  used for  both  years and  the rate  of  increases in  projected future
compensation levels was 5.5%  for both 1992 and  1991. The unrecognized cost  of
retroactive  benefits  granted by  plan amendments  is  being amortized  over 13
years.

    The Corporation and its  subsidiaries also provide  certain health care  and
life  insurance benefits for retired  employees. Substantially all employees may
become eligible for  these benefits  if they  reach retirement  age while  still
working   for  the  Corporation.  For  some   plans,  benefits  are  paid  under
administrative service contracts.  The cost  of health care  and life  insurance
benefits  is recognized as expense when claims are reported. For all health care
and life insurance plans related to retired employees, $8 million was charged to
expense in 1992 and $7 million in each of the years 1990 and 1991.

    In December 1990, the FASB issued  SFAS No. 106, "Employers' Accounting  for
Postretirement Benefits Other Than Pensions," establishing accounting principles
for retiree health and life insurance plans. The new standard requires companies
to  begin accruing in the  first quarter of 1993  for future medical benefits of
retirees rather than deducting these costs from reported profits each year  when
paid.

                                      F-14
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
Under  this standard, an employer has the  option to recognize the effect of the
standard's initial  obligation  either immediately  with  a one-time  charge  to
earnings  or on a delayed basis  over a period of years  not to exceed 20 years.
The  Corporation  will  implement  the  new  standard  in  1993  and  based   on
preliminary, unaudited studies made by the Corporation on its plans currently in
effect,  the  estimated  impact of  this  standard would  be  approximately $180
million, net of taxes, using the one-time charge method. The increase in  annual
expense  is estimated to be approximately $10 million, net of taxes. Adoption of
the standard will have no impact on cash flow.

1988 MANAGEMENT PERFORMANCE PLAN

    Pursuant to the 1988 Recapitalization, the 1988 Management Performance  Plan
(the  "1988 PLAN") was established. A total  of 8,600,000 shares of common stock
was reserved for  issuance under  the 1988 Plan.  The 1988  Plan authorized  the
grant of incentive stock options, nonqualified stock options, stock appreciation
rights,  restricted stock,  deferred stock,  performance shares  and performance
units.

    Under the 1988 Plan, as of  December 31, 1992, 3,878,275 nonqualified  stock
options  have  been issued  at an  option price  of $7.525,  but none  have been
exercised;  a  total  of  2,266,810  shares  of  restricted  stock  were   still
outstanding; and 108,294 shares of deferred stock had been awarded and remain to
be issued.

    Under the Prepackaged Plan, the 1988 Plan will be continued; all outstanding
stock  options will  be cancelled; 1,074,887  shares of  restricted and deferred
stock will be cashed out pursuant to "change in control" provisions contained in
the 1988 Plan; and  the balance of 1,278,849  shares of restricted and  deferred
stock  will remain outstanding subject  to the provisions of  the 1988 Plan as a
consequence of certain waivers of the change in control event by senior  members
of management.

PREFERRED SHARE PURCHASE RIGHTS

    On  June 6, 1988, the  Board adopted a Preferred  Share Purchase Rights Plan
(the "RIGHTS PLAN")  and pursuant  to its  provisions declared,  subject to  the
consummation  of the  1988 Recapitalization,  a distribution  of one  right (the
"RIGHTS")  upon  each   new  share   of  common   stock  issued   in  the   1988
Recapitalization.  The 1988 Recapitalization became  effective July 13, 1988 and
the distribution occurred immediately thereafter. The Rights contain  provisions
which  are  intended to  protect  stockholders in  the  event of  an unsolicited
attempt to acquire the Corporation.

    Under the terms of the Rights  Plan, the Rights will become exercisable  ten
days  following a  public announcement  that a  party acquired,  or obtained the
right to  acquire, beneficial  ownership of  20% or  more of  the  Corporation's
outstanding common shares, or ten days following commencement or announcement of
a  tender  offer  or  exchange  offer  for  30%  or  more  of  the Corporation's
outstanding common shares.  When exercisable,  each of the  Rights entitles  the
registered  holder to  purchase one-tenth of  a share of  a junior participating
preferred stock, series C, $1.00 par value  per share, at a price of $35.00  per
one-tenth  of a  preferred share, subject  to adjustment. If  the Corporation is
involved in a merger or business combination at any time after the Rights become
exercisable, the Rights will  entitle the holder  to buy a  number of shares  of
common  stock of  the acquiring company  having a  market value at  that time of
twice the exercise price of each of the Rights.

    Upon implementation of  the Prepackaged Plan,  the Rights Plan  will not  be
triggered  in  conjunction  with the  change  in  control, but  instead  will be
terminated. On  the Effective  Date, a  new  rights plan  will be  adopted  with
provisions substantially similar to the Rights Plan except that (i) the purchase
price  of the Rights  will be reset; (ii)  the expiration of  the Rights will be
extended; (iii)  a so-called  "flip-in"  feature and  exchange feature  will  be
added;  (iv) certain  exemptions will  be added  permitting the  acquisition and
continued holding of common shares by  Water Street and affiliates in excess  of
the  otherwise specified thresholds;  (v) the redemption  price will be reduced;
and (vi) the amendment provision will be liberalized.

                                      F-15
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

STOCKHOLDERS' EQUITY

    Changes in stockholders' equity are summarized as follows:

<TABLE>
<CAPTION>
                                                                                        1992       1991       1990
                                                                                      ---------  ---------  ---------
                                                                                       (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                                   <C>        <C>        <C>
Common Stock:
  Balance as of January 1...........................................................  $       5  $       5  $       5
                                                                                      ---------  ---------  ---------
  Balance as of December 31.........................................................          5          5          5
                                                                                      ---------  ---------  ---------
Capital Received in Excess of Par:
  Balance as of January 1...........................................................         24         23         15
  Restricted stock issuance/(forfeitures) and amortization (1992 -- (13,587) shares;
   1991 -- 673,305 shares; 1990 -- 941,990 shares)..................................         --          1          5
  Other, net........................................................................         (1)        --          3
                                                                                      ---------  ---------  ---------
  Balance as of December 31.........................................................         23         24         23
                                                                                      ---------  ---------  ---------
Deferred Currency Translation:
  Balance as of January 1...........................................................         --         --         (3)
  Currency translation adjustment...................................................         (8)        --          3
                                                                                      ---------  ---------  ---------
  Balance as of December 31.........................................................         (8)        --         --
                                                                                      ---------  ---------  ---------
Reinvested Earnings/(Deficit):
  Balance as of January 1...........................................................     (1,709)    (1,546)    (1,455)
  Net loss..........................................................................       (191)      (161)       (90)
  Other, net........................................................................         --         (2)        (1)
                                                                                      ---------  ---------  ---------
  Balance as of December 31.........................................................     (1,900)    (1,709)    (1,546)
                                                                                      ---------  ---------  ---------
    Total stockholders' equity/(deficit)............................................     (1,880)    (1,680)    (1,518)
                                                                                      ---------  ---------  ---------
                                                                                      ---------  ---------  ---------
</TABLE>

    As of December 31,  1992, the Corporation held  368,409 shares of $0.10  par
value  common  stock  in  treasury.  These  shares  were  acquired  through  the
forfeiture of restricted stock.

LITIGATION

    One of  the  Corporation's  subsidiaries, U.S.  Gypsum,  is  among  numerous
defendants   in  lawsuits   arising  out   of  the   manufacture  and   sale  of
asbestos-containing   building    materials.    U.S.   Gypsum    sold    certain
asbestos-containing products beginning in the 1930's; in most cases the products
were  discontinued or asbestos was removed from the product formula by 1972, and
no asbestos-containing products  were sold  after 1977. Some  of these  lawsuits
seek  to  recover compensatory  and  in many  cases  punitive damages  for costs
associated with maintenance  or removal and  replacement of products  containing
asbestos  (the "PROPERTY  DAMAGE CASES"). Others  of these  suits (the "PERSONAL
INJURY CASES") seek to recover compensatory  and in many cases punitive  damages
for   personal  injury  allegedly  resulting   from  exposure  to  asbestos  and
asbestos-containing products. It is anticipated that additional personal  injury
and property damage cases containing similar allegations will be filed.

    As discussed below, U.S. Gypsum has substantial personal injury and property
damage  insurance for  the years involved  in the asbestos  litigation. Prior to
1985, when  an asbestos  exclusion was  added to  U.S. Gypsum's  policies,  U.S.
Gypsum  purchased  comprehensive general  liability insurance  policies covering
personal injury and property damage in an aggregate face amount of approximately
$850 million. Insurers that issued approximately $100 million of these  policies
are  presently  insolvent. Because  U.S.  Gypsum's insurance  carriers initially
responded to its claims  for defense and  indemnification with various  theories
denying  or  limiting coverage  and the  applicability  of their  policies, U.S.
Gypsum

                                      F-16
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
filed a declaratory judgment  action against them in  the Circuit Court of  Cook
County,  Illinois on  December 29, 1983.  (U.S. GYPSUM CO.  V. ADMIRAL INSURANCE
CO., ET AL.) (the "COVERAGE ACTION"). U.S. Gypsum alleges in the Coverage Action
that the carriers are obligated  to provide indemnification for settlements  and
judgments  and, in some cases, defense costs incurred by U.S. Gypsum in personal
injury and  property  damage cases  in  which it  is  a defendant.  The  current
defendants  are  ten  insurance  carriers  that  provided  comprehensive general
liability insurance coverage  to U.S.  Gypsum between  the 1940's  and 1984.  As
discussed below, several carriers have settled all or a portion of the claims in
the Coverage Action.

    U.S.  Gypsum's  aggregate  expenditures  for  all  asbestos-related matters,
including property damage,  personal injury, insurance  coverage litigation  and
related  expenses,  exceeded aggregate  insurance payments  by $15.4  million in
1990, $10.9 million in 1991 and $25.8 million in 1992.

    PROPERTY DAMAGE CASES

    The Property Damage Cases have been brought against U.S. Gypsum by a variety
of plaintiffs, including school districts, state and local governments, colleges
and universities, hospitals, and private property owners. U.S. Gypsum is one  of
many  defendants in  four cases  that have been  certified as  class actions and
others that request  such certification.  One class  action suit  is brought  on
behalf  of owners and operators  of all elementary and  secondary schools in the
United States that  contain or contained  friable asbestos-containing  material.
(IN RE ASBESTOS SCHOOL LITIGATION, U.S.D.C., E.D.Pa.) Approximately 1,350 school
districts  opted out of the class, some of which have filed or may file separate
lawsuits  or  are  participants  in   a  state  court  class  action   involving
approximately  333 school districts in Michigan. (BOARD OF EDUCATION OF THE CITY
OF DETROIT, ET  AL. V. THE  CELOTEX CORP., ET  AL., Cir. Ct.  for Wayne  County,
Mich.)  On  April 10,  1992, a  state  court in  Philadelphia certified  a class
consisting of all owners of buildings leased to the federal government.  (PRINCE
GEORGE  CENTER,  INC.  V.  U.S.  GYPSUM  CO.,  ET  AL.,  Ct.  of  Common  Pleas,
Philadelphia, Pa.)  On September  4, 1992,  a Federal  district court  in  South
Carolina   conditionally  certified  a  class  comprised  of  all  colleges  and
universities in the United States,  which certification is presently limited  to
the resolution of certain allegedly "common" liability issues. (CENTRAL WESLEYAN
COLLEGE,  V.W.R. GRACE & CO.,  ET AL., U.S.D.C., S.C.).  On December 23, 1992, a
case was filed in state court in  South Carolina purporting to be a  "voluntary"
class  action on behalf of  owners of all buildings  containing certain types of
asbestos-containing  products  manufactured  by   the  nine  named   defendants,
including  U.S.  Gypsum, other  than  buildings owned  by  the federal  or state
governments, single family residences, or buildings  at issue in the four  above
described  class actions (ANDERSON COUNTY HOSPITAL V.  W.R. GRACE & CO., ET AL.,
Court of Common Pleas, Hampton Co., S.C. (the "ANDERSON CASE")). On January  14,
1993, the plaintiff filed an amended complaint that added a number of claims and
defendants,  including  the Corporation.  The  amended complaint  alleges, among
other things, that the guarantees executed by U.S. Gypsum in connection with the
1988 Recapitalization, as  well as  subsequent distributions of  cash from  U.S.
Gypsum  to  the Corporation,  rendered U.S.  Gypsum  insolvent and  constitute a
fraudulent conveyance pursuant  to Section27-23-10 of  the South Carolina  Code.
The  suit seeks to  set aside the guarantees  and recover the  value of the cash
flow "diverted"  from  U.S.  Gypsum  to  the Corporation  in  an  amount  to  be
determined.  This case  has not been  certified as  a class action  and no other
threshold issues,  including whether  the South  Carolina Courts  have  personal
jurisdiction  over  the  Corporation,  have been  decided.  The  damages claimed
against U.S. Gypsum in the class  action cases are unspecified. U.S. Gypsum  has
denied  the substantive  allegations of  each of  the Property  Damage Cases and
intends to  defend  them vigorously  except  when advantageous  settlements  are
possible.

    As  of December 31, 1992, 97 Property Damage Cases were pending against U.S.
Gypsum; however, the number of buildings involved is greater than the number  of
cases  because  many of  these cases,  including the  class actions  referred to
above, involve multiple buildings. Approximately 34 property damage claims  have
been threatened against U.S. Gypsum.

                                      F-17
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    In  total, U.S. Gypsum  has settled property  damage claims of approximately
180 plaintiffs involved in approximately 65 cases. All settlements were paid out
of reserves. Twenty-one cases have been tried  to verdict, 13 of which were  won
by  U.S. Gypsum and 8 lost.  Appeals are pending in four  of these cases. In the
cases lost, compensatory damage  awards against U.S.  Gypsum have totaled  $12.5
million. Punitive damages totaling $5.5 million were entered against U.S. Gypsum
in  four trials. Two of the punitive damage awards, totaling $1.45 million, were
paid after appeals were exhausted. The verdict in another case in which punitive
damages of  $75,000  were awarded  was  reversed by  the  Court of  Appeals  and
remanded for retrial. The remaining punitive award is on appeal.

    In  1990, 24 new  Property Damage Cases  were filed against  U.S. Gypsum, 21
were dismissed before trial, 14 were  settled, 4 were closed following trial  or
appeal,  and 124 were  pending at year  end; $14.6 million  was expended for the
defense and resolution of Property Damage  Cases and insurance payments of  $4.2
million  were received in 1990.  During 1991, 14 new  Property Damage Cases were
filed against U.S. Gypsum, 7 were dismissed before trial, 8 were settled, 2 were
closed following trial or appeal, and 121 were pending at year end; U.S.  Gypsum
expended  $22.2 million for the defense  and resolution of Property Damage Cases
and received  insurance  payments of  $13.8  million in  1991.  In 1992,  7  new
Property  Damage Cases were  filed against U.S. Gypsum,  9 were dismissed before
trial, 17 were settled,  2 were closed  following trial or  appeal, and 97  were
pending  at year  end. U.S.  Gypsum expended  approximately $35  million for the
defense and resolution of Property Damage Cases and received insurance  payments
of $10.2 million in 1992.

    In  the Property Damage Cases litigated to date, a defendant's liability for
compensatory damages, if any,  has been limited to  damages associated with  the
presence  and  quantity  of asbestos-containing  products  manufactured  by that
defendant which are identified in the buildings at issue, although plaintiffs in
some cases have  argued that principles  of joint and  several liability  should
apply.  Because of the  unique factors inherent  in each of  the Property Damage
Cases, including the lack of  reliable information as to product  identification
and  the amount of damages claimed against  U.S. Gypsum in many cases, including
the class actions  described above, management  is unable to  make a  reasonable
estimate of the cost of disposing of pending Property Damage Cases.

    PERSONAL INJURY CASES

    U.S.  Gypsum was among numerous defendants in asbestos personal injury suits
and administrative claims involving 54,188 claimants pending as of December  31,
1992. All asbestos bodily injury claims pending in the federal courts, including
approximately  one-third  of  the  Personal Injury  Cases  pending  against U.S.
Gypsum, have  been consolidated  in the  United States  District Court  for  the
Eastern District of Pennsylvania.

    U.S.  Gypsum  is  a  member,  together with  19  other  former  producers of
asbestos-containing  products,  of  the   Center  for  Claims  Resolution   (the
"CENTER").  The  Center  has assumed  the  handling, including  the  defense and
settlement, of all  Personal Injury Cases  pending against U.S.  Gypsum and  the
other  members of the Center. Each member of the Center is assessed a portion of
the liability and  defense costs  of the Center  for the  Personal Injury  Cases
handled  by the Center, according to  predetermined allocation formulas. Five of
U.S. Gypsum's insurance  carriers that  in 1985 signed  an Agreement  Concerning
Asbestos-Related  Claims  (the "WELLINGTON  AGREEMENT") are  supporting insurers
(the "SUPPORTING INSURERS") of the Center. The Supporting Insurers are obligated
to provide coverage for the defense and indemnity costs of the Center's  members
pursuant  to the  coverage provisions  in the  Wellington Agreement.  Claims for
punitive damages are defended  but not paid by  the Center; if punitive  damages
are  recovered,  insurance  coverage  may  be  available  under  the  Wellington
Agreement depending on  the terms  of particular policies  and applicable  state
law. Punitive damages have not been awarded against

                                      F-18
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
U.S.  Gypsum in any of the Personal Injury Cases. Virtually all of U.S. Gypsum's
personal injury liability and defense costs  are paid by those of its  insurance
carriers   that  are  Supporting  Insurers.  The  Supporting  Insurers  provided
approximately $350 million of the total coverage referred to above.

    On January 15, 1993, U.S.  Gypsum and the other  members of the Center  were
named  as defendants in a class action filed  in the U.S. District Court for the
Eastern District Pennsylvania (CARLOUGH ET AL. V. AMCHEM PRODUCTS INC., ET  AL.,
Case No. 93-CV-0215). The complaint generally defines the class of plaintiffs as
all persons who have been occupationally exposed to asbestos-containing products
manufactured  by the defendants,  who had not filed  an asbestos personal injury
suit as of the date of the  filing of the class action. Simultaneously with  the
filing  of the class action,  the parties filed a  settlement agreement in which
the named  plaintiffs, proposed  class  counsel, and  the defendants  agreed  to
settle  and  compromise the  claims of  the proposed  class. The  settlement, if
approved by the  court, will  implement for  all future  Personal Injury  Cases,
except as noted below, an administrative compensation system to replace judicial
claims  against the defendants, and will  provide fair and adequate compensation
to future claimants who can demonstrate exposure to asbestos-containing products
manufactured by the defendants and the presence of an asbestos-related  disease.
This  administrative compensation system is  based upon defined medical criteria
for compensation  of  claimants;  predetermined  compensation  ranges  for  each
compensable  medical  condition;  annual  case  flow  caps;  the  elimination of
punitive damage claims; and  limitation on attorneys  fees payable by  claimants
compensated  through the program. Class members will be given the opportunity to
"opt out," or elect to be excluded from the settlement, although the  defendants
reserve  the right to withdraw from the settlement if the number of opt outs is,
in their sole judgment, excessive. In addition, in each year a limited number of
claimants will have certain  rights to prosecute  their claims for  compensatory
(but  not  punitive) damages  in  court in  the  event they  reject compensation
offered by the administrative processing of their claim.

    The district court assigned to the class action is expected to set dates for
hearings on notice to the class,  objections to the settlement, requests to  opt
out  of the class,  and the fairness of  the settlement to  class members. It is
anticipated that appeals will follow the district court's ruling on the fairness
of the settlement. Also on January 15, 1993, the Center members, including  U.S.
Gypsum,  instituted proceedings against  those of their  insurance carriers that
had not consented to support the settlement, seeking a declaratory judgment that
the settlement is reasonable and, therefore, that the carriers are obligated  to
fund  their portion  of it. Consummation  of the settlement  is contingent upon,
among other things, court approval of  the settlement and a favorable ruling  in
the declaratory judgment proceedings against the non-consenting insurers.

    Each  of  the defendants  has committed  to  fund a  defined portion  of the
settlement, up to a stated maximum  amount, over the initial ten-year period  of
the  agreement  (which  is  automatically  extended  unless  terminated  by  the
defendants). Taking  into account  the provisions  of the  settlement  agreement
concerning  the number  of claims that  must be  processed in each  year and the
total amount that must be made available to the claimants, the Center  estimates
that  U.S. Gypsum  will be  obligated to  fund a  maximum of  approximately $125
million of the class  action settlement, exclusive of  expenses, with a  maximum
payment of less than $18 million in any single year; of the total amount of U.S.
Gypsum's obligation, all but approximately $13 million or less is expected to be
paid by U.S. Gypsum's insurance carriers.

    During 1990, 11,095 new Personal Injury Cases were filed against U.S. Gypsum
and  7,272 were  settled or  dismissed. U.S.  Gypsum incurred  expenses of $14.2
million in 1990 with  respect to Personal Injury  Cases, $13.9 million of  which
was  paid directly by insurance. During  1991, 13,077 Personal Injury Cases were
filed against  U.S. Gypsum  and 6,273  were settled  or dismissed.  U.S.  Gypsum
incurred  expenses  of $15.1  million in  1991 with  respect to  Personal Injury
Cases, of  which  $15.0 million  was  paid  by insurance.  During  1992,  20,117
Personal  Injury Cases were filed against U.S. Gypsum and 10,631 were settled or
dismissed. U.S. Gypsum incurred expenses of  $21.6 million in 1992 with  respect
to

                                      F-19
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
Personal  Injury  Cases of  which $21.5  million  was paid  by insurance.  As of
December 31, 1992,  1991 and  1990, 54,188,  42,652 and  36,967 Personal  Injury
Cases were outstanding against U.S. Gypsum, respectively.

    U.S.  Gypsum's average  settlement cost for  Personal Injury  Cases over the
past three years has been approximately  $1,350 per claim, exclusive of  defense
costs.  Management anticipates  that its  average settlement  cost is  likely to
increase due  to  such factors  as  the possible  insolvency  of  co-defendants,
although  this increase may be offset to some extent by other factors, including
the possibility for block settlements of large numbers of cases and the apparent
increase in the percentage of asbestos personal injury cases that appear to have
been  brought  by  individuals  with  little  or  no  physical  impairment.   In
management's  opinion,  based primarily  upon  U.S. Gypsum's  experience  in the
Personal Injury Cases disposed of to date and taking into consideration a number
of uncertainties, it  is probable  that asbestos-related  Personal Injury  Cases
pending  against U.S. Gypsum as of December 31,  1992, can be disposed of for an
amount estimated to  be between  $80 million  and $100  million, including  both
indemnity  costs and legal fees and expenses. The increase in the estimated cost
of resolving pending claims is  the result of (i) an  increase in the number  of
pending  claims;  (ii) the  settlements of  certain large  blocks of  claims for
higher per-case averages than  have historically been paid;  and (iii) a  slight
increase  in U.S.  Gypsum's historical settlement  average. No  accrual has been
recorded for this  amount because,  pursuant to the  Wellington Agreement,  U.S.
Gypsum's signatory insurance carriers are obligated to pay these costs.

    Assuming  that the  class action  settlement referred  to above  is approved
substantially in its  current form, management  estimates, based on  assumptions
supplied  by the Center, U.S. Gypsum's maximum total exposure in Personal Injury
Cases during the next ten years  (the initial term of the agreement),  including
liability  for  pending claims,  claims  resolved as  part  of the  class action
settlement, and opt out claims, as well as defense costs and other expenses,  at
approximately  $271 million, of  which at least  $254 million is  expected to be
paid by insurance.

    COVERAGE ACTION

    As indicated above, all of U.S. Gypsum's carriers initially denied  coverage
for  the Property Damage  Cases and the  Personal Injury Cases,  and U.S. Gypsum
initiated the Coverage  Action to  establish its  right to  such coverage.  U.S.
Gypsum  has voluntarily dismissed the Supporting Insurers referred to above from
the personal injury portion of the Coverage Action because they are committed to
providing personal injury coverage in accordance with the Wellington  Agreement.
U.S.  Gypsum's  claims  against  the remaining  carriers  for  coverage  for the
Personal Injury Cases have been stayed since 1984.

    On January 7,  1991, the trial  court in  the Coverage Action  ruled on  the
applicability of U.S. Gypsum's insurance policies to settlements and one adverse
judgment  in eight Property Damage  Cases. The court ruled  that the eight cases
were generally covered,  and imposed coverage  obligations on particular  policy
years based upon the dates when the presence of asbestos-containing material was
"first   discovered"  by  the   plaintiff  in  each   case.  The  court  awarded
reimbursement of approximately $6.2 million spent by U.S. Gypsum to resolve  the
eight  cases. U.S. Gypsum  has appealed the  court's ruling with  respect to the
policy years  available  to  cover  particular claims,  and  the  carriers  have
appealed  most other aspects of the court's  ruling. These appeals are likely to
take a year or more.

    U.S. Gypsum's experience in the  Property Damage Cases suggests that  "first
discovery"  dates in the eight  cases referred to above  (1978 through 1985) are
likely to  be typical  of  most pending  cases.  U.S. Gypsum's  total  insurance
coverage  for  the years  1978 through  1984  totals approximately  $350 million
(after subtracting  insolvencies  and  discounts given  to  settling  carriers).
However,  some pending cases, as well as some  cases filed in the future, may be
found to have first discovery dates later than August 1, 1984, after which  U.S.
Gypsum's  insurance  policies  did  not  provide  coverage  for asbestos-related
claims. In addition, as described below, the first layer excess carrier for  the
years 1980 through 1984 is

                                      F-20
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
insolvent  and U.S. Gypsum may  be required to pay  amounts otherwise covered by
those and  other  insolvent policies.  Accordingly,  if the  court's  ruling  is
affirmed,  U.S. Gypsum will likely be required to  bear a portion of the cost of
the property damage litigation.

    Eight carriers, including two of the Supporting Insurers, have settled  U.S.
Gypsum's  claims for both property damage  and personal injury coverage and have
been dismissed from the  Coverage Action entirely. Four  of these carriers  have
agreed to pay all or a substantial portion of their policy limits to U.S. Gypsum
beginning  in 1991 and continuing  over the next four  years. Three other excess
carriers, including the two settling Supporting Insurers, have agreed to provide
coverage for the Property Damage Cases and the Personal Injury Cases subject  to
certain  limitations and conditions,  when and if  underlying primary and excess
coverage is  exhausted. It  cannot presently  be determined  when such  coverage
might   be  reached.  Taking  into  account  the  above  settlements,  including
participation of certain of the  settling carriers in the Wellington  Agreement,
and  consumption  through  December  31, 1991,  carriers  providing  a  total of
approximately $105 million of unexhausted insurance have agreed, subject to  the
terms  of the various settlement agreements, to cover both Personal Injury Cases
and Property  Damage Cases.  Carriers providing  an additional  $309 million  of
coverage  that was  unexhausted as  of December  31, 1991  have agreed  to cover
Personal Injury Cases under  the Wellington Agreement,  but continue to  contest
coverage for Property Damage Cases and remain defendants in the Coverage Action.
U.S.  Gypsum will continue  to seek negotiated resolutions  with its carriers in
order to minimize the expense and delays of litigation.

    Insolvency proceedings have  been instituted against  four of U.S.  Gypsum's
insurance  carriers.  Midland  Insurance Company,  declared  insolvent  in 1986,
provided excess insurance ($4  million excess of $1  million excess of  $500,000
primary  in  each policy  year) from  February  15, 1975  to February  15, 1978;
Transit Casualty Company, declared insolvent in 1985, provided excess  insurance
($15  million excess of $1  million primary in each  policy year) from August 1,
1980 to December 31,  1985; Integrity Insurance  Company, declared insolvent  in
1986,  provided excess insurance ($10 million  quota share of $25 million excess
of $90  million) from  August 1,  1983 to  July 31,  1984; and  American  Mutual
Insurance  Company, declared  insolvent in 1989,  provided the  primary layer of
insurance ($500,000 per year)  from February 1,  1963 to April  15, 1971. It  is
possible  that U.S.  Gypsum will be  required to pay  a presently indeterminable
portion of the costs that would otherwise have been covered by these policies.

    It is not  possible to predict  the number of  additional lawsuits  alleging
asbestos-related  claims that  may be filed  against U.S. Gypsum.  The number of
Personal Injury Claims pending against U.S. Gypsum has increased in each of  the
last  several years.  In addition,  many Property Damage  Cases are  still at an
early stage and the potential liability therefrom is consequently uncertain.  In
view  of the current financial circumstances of the Corporation, and the limited
insurance funding currently  available for the  Property Damage Cases  resulting
from the continued resistance by a number of U.S. Gypsum's insurers to providing
coverage,  the effect of the asbestos  litigation on the Corporation will depend
upon a variety of factors, including  the damages sought in the Property  Damage
Cases  that reach  trial prior  to the completion  of the  Coverage Action, U.S.
Gypsum's ability to successfully defend or settle such cases, and the resolution
of the Coverage Action. As a  result, management is unable to determine  whether
an  adverse  outcome in  the asbestos  litigation will  have a  material adverse
effect on the results  of operations or the  consolidated financial position  of
the Corporation.

    ENVIRONMENTAL LITIGATION

    The  Corporation and certain of its subsidiaries have been notified by state
and federal environmental protection agencies of possible involvement as one  of
numerous  "potentially responsible parties" in a number of so-called "Superfund"
sites in the United States. In substantially all of these sites, the involvement
of  the  Corporation  or  its  subsidiaries  is  expected  to  be  minimal.  The
Corporation  believes that  appropriate reserves  have been  established for its
potential liability in connection with all Superfund

                                      F-21
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)
sites but is continuing to review its accruals as additional information becomes
available. The Corporation  does not presently  anticipate any material  adverse
effect  upon its earnings or consolidated  financial position arising out of the
resolution of these matters or any other known governmental proceeding regarding
environmental matters.

SUBSEQUENT EVENT

    On March 17,  1993, the  Corporation filed a  Plan of  Reorganization and  a
petition for relief under Chapter 11 of the United States Bankruptcy Code in the
Bankruptcy  Court. On that  date, the Corporation also  obtained orders from the
Bankruptcy Court authorizing,  among other things:  (i) payment of  pre-petition
liabilities  to  trade creditors  and employees;  (ii) continuation  of existing
employee compensation, benefits  and insurance programs;  (iii) continuation  of
the  consolidated  cash  management  system  and  corporate  liability insurance
programs; and (iv) payment of current interest  due to the Banks and holders  of
senior  debt securities. A hearing on confirmation of the Plan of Reorganization
has been set for April 23, 1993. None of the subsidiaries of the Corporation are
part of this proceeding and  there will be no impact  on the trade creditors  of
the Corporation's subsidiaries.

    The   following  unaudited   pro  forma   consolidated  balance   sheet  and
accompanying notes as of December 31, 1992 were prepared as if the  consummation
of  the Prepackaged  Plan had  occurred on that  date including  the adoption of
"Fresh Start  Reporting"  as  required  by AICPA  Statement  of  Position  90-7,
"Financial  Reporting by Entities  in Reorganization under  the Bankruptcy Code"
("SOP 90-7"). This pro forma statement is qualified in its entirety by reference
to the more detailed pro forma financial information appearing in the Disclosure
Statement, including the Plan of Reorganization substantially as filed with  the
Bankruptcy  Court and  to the  latest Pro  Forma Financial  Information included
elsewhere in this Registration Statement.

                                      F-22
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                      PRO FORMA CONSOLIDATED BALANCE SHEET
                            AS OF DECEMBER 31, 1992
                                  (UNAUDITED)
                                     ASSETS

<TABLE>
<CAPTION>
                                                                                   PRO FORMA ADJUSTMENTS
                                                                               ------------------------------
                                                                               RESTRUCTURING    FRESH START
                                                                  HISTORICAL     ADJUSTMENT     ADJUSTMENTS     PRO FORMA
                                                                  -----------  --------------  --------------  -----------
                                                                                (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                               <C>          <C>             <C>             <C>
Current Assets:
  Cash and cash equivalents.....................................   $     180   $      (48)(a)  $       --       $     132
  Receivables (net of reserves of $11)..........................         299          (64)(b)          --             235
  Inventories...................................................         113           --              25(i)          138
  Restricted cash...............................................          88          (88)(a)          --              --
                                                                  -----------     -------         -------      -----------
    Total current assets........................................         680         (200)             25             505
                                                                  -----------     -------         -------      -----------
  Property, Plant and Equipment, Net............................         800           --              --             800
  Purchased Goodwill, Net.......................................          69           --             (69)(i)          --
  Other Assets..................................................         110          (58)(c)          --              52
  Reorganization Value in Excess of Identifiable Assets.........          --           --             679(i)          679
                                                                  -----------     -------         -------      -----------
      Total assets..............................................       1,659         (258)            635           2,036
                                                                  -----------     -------         -------      -----------
                                                                  -----------     -------         -------      -----------
                                           LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable..............................................          91           --              --              91
  Accrued expenses..............................................         553         (380)(d)          --             173
  Notes payable.................................................           2           --              --               2
  Revolving Credit Facility.....................................         140         (140)(e)          --              --
  Long-term debt maturing within one year.......................         576         (570)(e)          --               6
  Long-term debt classified as current..........................       1,926       (1,926)(e)          --              --
  Taxes on income...............................................          --           20(f)           16(j)           36
                                                                  -----------     -------         -------      -----------
      Total current liabilities.................................       3,288       (2,996)             16             308
                                                                  -----------     -------         -------      -----------
Long-Term Debt..................................................          67        1,469(e)         (265)(k)       1,271
Deferred Income Taxes...........................................         175           14(f)           53(j)          242
Minority Interest in CGC........................................           9           --              --               9
Other Long-Term Obligations.....................................          --           --             182(l)          182
Stockholders' Equity/(Deficit):
  Preferred stock -- $1 par value; authorized 36,000,000 shares;
   $1.80 convertible preferred stock (initial series);
   outstanding -- none..........................................          --           --              --              --
  Common Stock -- $0.10 par; authorized 300,000,000 shares;
   outstanding -- 55,757,394 (after deducting 368,409 shares
   held in treasury), pro forma outstanding -- 37,171,600
   shares.......................................................           5           (2)(g)          --               3
  Capital received in excess of par value.......................          23          431(g)         (433)(m)          21
  Deferred currency translation.................................          (8)          --               8(n)           --
  Reinvested earnings/(deficit).................................      (1,900)         826(h)        1,074(o)           --
                                                                  -----------     -------         -------      -----------
      Total stockholders' equity/(deficit)......................      (1,880)       1,255             649              24
                                                                  -----------     -------         -------      -----------
      Total liabilities and stockholders' equity................       1,659         (258)            635           2,036
                                                                  -----------     -------         -------      -----------
                                                                  -----------     -------         -------      -----------
</TABLE>

      See accompanying Notes to the Pro Forma Consolidated Balance Sheet.

                                      F-23
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

NOTES TO THE PRO FORMA CONSOLIDATED BALANCE SHEET (UNAUDITED)

    The following  notes set  forth  the explanations  and assumptions  used  in
preparing  the unaudited  Pro Forma  Consolidated Balance  Sheet. The  pro forma
adjustments are  based  on  estimates  by  the  Corporation's  management  using
information currently available.

(a) Reflects the following (in millions of dollars):

<TABLE>
<S>                                                                           <C>
Repayment of Revolving Credit Facility......................................  $    (140)
Payment of nonrecurring fees and expenses incurred in connection with the
 Restructuring..............................................................        (22)
Payments under Management Incentive Compensation Plan.......................        (16)*
Payment of excess Bank Debt accrued interest................................        (15)
Collection of letters of credit classified as accounts receivable...........         42
Reclassification of proceeds received from the sale of DAP which have been
 restricted for use in the Restructuring....................................         88
Collection of appeal bonds classified as accounts receivable................         15
                                                                              ---------
                                                                                    (48)
                                                                              ---------
                                                                              ---------
</TABLE>

    * Payments  under Management Incentive Compensation  Plan represent the cash
      payment of  a  management  bonus  which is  contingent  and  payable  upon
      successful implementation of the Restructuring.

(b) Reflects the following (in millions of dollars):

<TABLE>
<S>                                                                            <C>
Collection of letters of credit classified as accounts receivable              $     (42)
Industrial revenue bonds previously put back to the Corporation that will not
 be remarketed results in reductions in accounts receivable and debt.........         (7)
Collection of appeal bonds classified as accounts receivable.................        (15)
                                                                                     ---
                                                                                     (64)
                                                                                     ---
                                                                                     ---
</TABLE>

(c)  For financial reporting purposes,  old capitalized financing costs totaling
    ($25)  million  applicable  to  the  Bank  Debt  and  the  Old  Subordinated
    Debentures  and deferred reorganization expenses  totaling ($33) million are
    being written  off  to  the extraordinary  gain  and  reorganization  items,
    respectively.

(d) Reflects the following (in millions of dollars):

<TABLE>
<S>                                                                           <C>
Write-off of accrued interest that will not be paid to holders of the Old
 Senior Subordinated Debentures.............................................  $    (221)
Reclassification of Bank Debt accrued interest to debt......................        (75)
Write-off of Default Interest on the Bank Debt..............................        (44)
Reclassification of accrued interest on swaps to debt.......................        (22)
Reversal of accrued management incentive compensation.......................         (3)
Payment of excess Bank Debt accrued interest................................        (15)
                                                                              ---------
                                                                                   (380)
                                                                              ---------
                                                                              ---------
</TABLE>

                                      F-24
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

(e)   Represents   changes   in  short-term   and   long-term   debt  (including
    reclassification of the remaining balance  of debt classified as current  to
    long-term  debt) as  a result  of the Prepackaged  Plan. The  change in debt
    consists of the following:

<TABLE>
<CAPTION>
                                                               REVOLVING         LTD           LTD
                                                                CREDIT       MATURING IN   CLASSIFIED    LONG-TERM
                                              NOTES PAYABLE    FACILITY       ONE YEAR     AS CURRENT      DEBT        TOTAL
                                              -------------  -------------  -------------  -----------  -----------  ---------
                                                                        (DOLLAR AMOUNTS IN MILLIONS)
<S>                                           <C>            <C>            <C>            <C>          <C>          <C>
Historical carrying amounts.................    $       2      $     140      $     576     $   1,926    $      67   $   2,711
                                                      ---         ------         ------    -----------  -----------  ---------
Old Senior 1991 Notes.......................                                       (100)                                  (100)
Old Senior 1996 Notes.......................                                                                   (10)        (10)
Old Senior Subordinated Debentures..........                                                                  (600)       (600)
Old Junior Subordinated Debentures..........                                                                  (515)       (515)
Bank Debt...................................                        (140)          (470)                      (370)       (980)
Industrial revenue bonds....................                                                                    (7)         (7)
New Senior 1995 Notes.......................                                                                    75          75
New Senior 1998 Notes.......................                                                                    35          35
New Bank Debt...............................                                                                   540         540
New 10 1/4% Senior Notes....................                                                                   340         340
Capitalized interest notes..................                                                                    55          55
Reclassification............................                                                   (1,926)       1,926          --
                                                      ---         ------         ------    -----------  -----------  ---------
Pro forma adjustment........................           --           (140)          (570)       (1,926)       1,469      (1,167)
                                                      ---         ------         ------    -----------  -----------  ---------
Pro forma carrying amounts before fresh
 start adjustments..........................            2             --              6            --        1,536       1,544
                                                      ---         ------         ------    -----------  -----------  ---------
                                                      ---         ------         ------    -----------  -----------  ---------
</TABLE>

(f)  As a result of the  Restructuring, the domestic operating loss and  related
    income tax benefit would be reduced.

(g) Reflects the following:

<TABLE>
<CAPTION>
                                                                             CAPITAL RECEIVED
                                                                               IN EXCESS OF
                                                                                 PAR VALUE       COMMON STOCK
                                                                            -------------------  -------------
                                                                               (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                         <C>                  <C>
Issuance of 36,056,452 shares of New Common Stock at an estimated market
 price of $11.67 (reflecting the impact of the Reverse Stock Split) under
 the terms of the Prepackaged Plan to holders of the Old Subordinated
 Debentures...............................................................       $     418         $       3
Record estimated market value of New Warrants issued to holders of Old
 Junior Subordinated Debentures...........................................              10                --
Impact of the Reverse Stock Split.........................................               5                (5)
Tax impact on cancelled restricted stock..................................              (2)               --
                                                                                     -----               ---
                                                                                       431                (2)
                                                                                     -----               ---
                                                                                     -----               ---
</TABLE>

                                      F-25
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

(h)  Reflects the  write-off of $55  million for nonrecurring  fees and expenses
    incurred in connection  with the Restructuring  and the extraordinary  gain,
    net  of taxes, resulting from the  Restructuring which has been estimated as
    follows (in millions of dollars):

<TABLE>
<S>                                                            <C>        <C>        <C>
Old Senior Subordinated Debentures:
  Historical carrying amount.................................  $     600
  Estimated market value of $11.67 per share times 30,480,712
   shares of New Common Stock issued in the Restructuring
   (after the Reverse Stock Split)...........................       (356)
                                                               ---------
    Retirement of Old Senior Subordinated Debentures.........             $     244
    Write-off of old capitalized financing costs.............                   (15)
    Write-off of old accrued interest........................                   221
                                                                          ---------
      Subtotal...............................................                        $     450
Old Junior Subordinated Debentures:
  Historical carrying amount.................................        480
  Estimated market value of $11.67 per share times 5,575,740
   shares of New Common Stock issued in the Restructuring
   (after the Reverse Stock Split)...........................        (65)
                                                               ---------
    Retirement of Old Junior Subordinated Debentures.........                   415
    Write-off of old capitalized financing costs.............                    (1)
    Estimated market value of New Warrants issued in the
     Restructuring...........................................                   (10)
    Write-off of old accrued interest........................                    35
                                                                          ---------
      Subtotal...............................................                              439
Bank Debt:
  Write-off of old capitalized financing costs...............                    (7)
  Write-off of accrued Default Interest......................                    44
                                                                          ---------
      Subtotal...............................................                               37
      Record Management Incentive Compensation Plan..........                              (13)*
      Tax provision..........................................                              (32)
                                                                                         -----
      Total..................................................                              881
                                                                                         -----
                                                                                         -----
</TABLE>

    * The  Management  Incentive  Compensation  Plan  adjustment  represents   a
      provision  for  a management  bonus  which is  contingent  upon successful
      implementation of the Restructuring.

(i)  An estimated  reorganization value of  $2,036 million (the  "REORGANIZATION
    VALUE")  is  being  used  to  implement  fresh  start  reporting  along with
    adjustments of  $25 million  to  inventory and  ($69) million  to  purchased
    goodwill, of which the Reorganization Value in excess of identifiable assets
    is  estimated to be approximately $679 million. The net of these adjustments
    is reflected  as  a  decrease  against  reinvested  earnings/(deficit).  The
    Corporation  plans to  review its property,  plant and  equipment and obtain
    appraisals of assets in order to determine what revisions, if any, should be
    made to individual accounts. The final allocation of Reorganization Value to
    the Corporation's  assets will  take  place once  the review  and  appraisal
    process  is  completed.  The  Corporation  does  not  expect  any  potential
    adjustment to have a  material adverse impact  to the financial  statements.
    Any  allocation would have no effect on cash flow or EBITDA and would result
    in a timing difference of reported earnings  in the future. If a portion  of
    the  $679 million is ultimately allocated  to property, plant and equipment,
    net income would increase between 1993 and 1997 and would be reduced  beyond
    1997,  since Reorganization Value in excess  of identifiable assets would be
    fully amortized over five years, while depreciation would continue over  the
    estimated useful life of the Corporation's assets.

                                      F-26
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

(j)  Reflects the tax adjustment associated with the adoption of SOP 90-7.

(k)  In accordance with SOP 90-7, the Corporation's liabilities will be recorded
    at their estimated present values as of the Effective Date. For purposes  of
    the unaudited Pro Forma Consolidated Balance Sheet, the present value of the
    Corporation's liabilities, other than long-term debt, is assumed to be equal
    to  the historical book value of  such liabilities. The adjustment to reduce
    total pro forma  debt (after  the adjustment in  note (e))  to an  estimated
    present value using discount rates ranging from 9% to 14% is $265 million.

(l)    Reflects  the  adoption  of  SFAS  No.  106,  Employers'  Accounting  for
    Postretirement Benefits  Other  than  Pensions  using  the  one-time  charge
    method.

(m)  In accordance  with SOP 90-7,  this adjustment reflects  the elimination of
    reinvested earnings/(deficit)  of  ($425)  million and  the  elimination  of
    deferred  currency of ($8) million against capital received in excess of par
    value.

(n) In accordance  with SOP 90-7,  this adjustment reflects  the elimination  of
    deferred  currency  translation against  capital received  in excess  of par
    value.

(o) Reflects  the  offset to  all  of the  fresh  start adjustments  except  for
    deferred  currency  which is  offset in  capital received  in excess  of par
    value.

HISTORICAL CONSOLIDATING FINANCIAL STATEMENTS

    In February  1993,  the  Corporation filed  a  registration  statement  with
respect  to $340 million aggregate principal amount of New 10 1/4% Senior Notes.
Each of United States Gypsum Company, USG Industries, Inc., USG Interiors, Inc.,
USG  Foreign  Investments,  Ltd.,  L&W  Supply  Corporation,  Westbank  Planting
Company,  USG Interiors International, Inc.,  American Metals Corporation and La
Mirada Products Co., Inc. (together, the "COMBINED GUARANTORS") will  guarantee,
in the manner described below, both the obligations of the Corporation under the
amended  Credit Agreement  and the  New 10  1/4% Senior  Notes. These Subsidiary
Guarantees  are  full  and  unconditional  guarantees  of  prompt  payment   and
performance,  when due.  The Combined Guarantors  will be  jointly and severally
liable under the Subsidiary Guarantees. Holders  of the Bank Debt will have  the
right  to (i) determine whether, when and  to what extent the guarantees will be
enforced (provided that each guarantee payment will be applied to the Bank  Term
Loan,  Extended Revolving  Credit Facility,  Capitalized Interest  Notes and New
10 1/4% Senior Notes pro rata based on the respective amounts owed thereon)  and
(ii)  amend or eliminate the guarantees.  The guarantees will terminate when the
Bank Term  Loan, the  Extended  Revolving Credit  Facility and  the  Capitalized
Interest  Notes are retired regardless  of whether the New  10 1/4% Senior Notes
remain unpaid. The liability of each of the Combined Guarantors on its guarantee
is limited to the greater of (i) 95% of the lowest amount, calculated as of July
13, 1988, sufficient to render the guarantor insolvent, leave the guarantor with
unreasonably small capital  or leave the  guarantor unable to  pay its debts  as
they become due (each as defined under applicable law) and (ii) the same amount,
calculated  as of the date any demand  for payment under such guarantee is made,
in each case plus collection costs. The guarantees will be senior obligations of
the applicable  guarantor  and will  rank  PARI PASSU  with  all  unsubordinated
obligations of the guarantor.

    There  are 43 Non-Guarantors  (the "COMBINED NON-GUARANTORS"), substantially
all of  which  are  subsidiaries  of  Guarantors.  The  Combined  Non-Guarantors
primarily  include CGC Inc., Gypsum Transportation Limited, and the European and
Pacific subsidiaries of USG Interiors, Inc.  The long-term debt of the  Combined
Non-Guarantors  of $28  million at December  31, 1992  has restrictive covenants
that restrict, among other things, the payment of dividends.

                                      F-27
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

    The following condensed consolidating information presents:

    (1) Condensed financial statements as of December 31, 1992 and 1991 and  for
       the  years ended December 31, 1992, 1991  and 1990 of (a) the Corporation
       on a  parent  company  only  basis (Parent  Company),  (b)  the  Combined
       Guarantors,  (c) the Combined Non-Guarantors and (d) the Corporation on a
       consolidated basis.

    (2) The  Parent  Company  and  Combined  Guarantors  are  shown  with  their
       investments in their subsidiaries accounted for on the equity method.

    (3)  Elimination entries necessary to consolidate the Parent Company and its
       subsidiaries.

                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                          YEAR ENDED DECEMBER 31, 1992

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS   CONSOLIDATED
                                               -----------  -----------  -------------  -------------  -------------
                                                                   (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>          <C>          <C>            <C>            <C>
Net Sales....................................   $      --    $   1,503     $     359      $     (85)     $   1,777
Gross Profit.................................          (2)         251            68             --            317
Operating Profit.............................         (30)         105            24             --             99
Equity in net (earnings)/loss of the
 Subsidiaries................................         230          (17)           --           (213)            --
Interest expense, net........................         310           10             2             --            322
Corporate service charge.....................        (340)         340            --             --             --
Other (income)/expense, net..................         (73)          75            (1)            --              1
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) Before Taxes on Income.......        (157)        (303)           23            213           (224)
Taxes on income/(income tax benefit).........          34          (73)            6             --            (33)
                                               -----------  -----------        -----         ------    -------------
Net Earnings/(Loss)..........................        (191)        (230)           17            213           (191)
                                               -----------  -----------        -----         ------    -------------
                                               -----------  -----------        -----         ------    -------------
</TABLE>

                                      F-28
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                          YEAR ENDED DECEMBER 31, 1991

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS   CONSOLIDATED
                                               -----------  -----------  -------------  -------------  -------------
                                                                   (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>          <C>          <C>            <C>            <C>
Net Sales....................................   $      --    $   1,452     $     366      $    (106)     $   1,712
Gross Profit.................................           1          241            85             --            327
Operating Profit.............................         (22)         110            45             --            133
Equity in net (earnings)/loss of the
 Subsidiaries................................         185          (30)           --           (155)            --
Interest expense, net........................         305           15             2             --            322
Corporate service charge.....................        (331)         331            --             --             --
Other (income)/expense, net..................           7           (3)            1             --              5
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) Before Taxes on Income.......        (188)        (203)           42            155           (194)
Taxes on income/(income tax benefit).........          15          (80)           12             --            (53)
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) from Continuing Operations...        (203)        (123)           30            155           (141)
Discontinued operations......................          41          (61)           --             --            (20)
                                               -----------  -----------        -----         ------    -------------
Net Earnings/(Loss)..........................        (162)        (184)           30            155           (161)
                                               -----------  -----------        -----         ------    -------------
                                               -----------  -----------        -----         ------    -------------
</TABLE>

                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                          YEAR ENDED DECEMBER 31, 1990

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS   CONSOLIDATED
                                               -----------  -----------  -------------  -------------  -------------
                                                                   (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>          <C>          <C>            <C>            <C>
Net Sales....................................   $      --    $   1,631     $     386      $    (102)     $   1,915
Gross Profit.................................           2          320            94             --            416
Operating Profit.............................         (33)         174            54             --            195
Equity in net (earnings)/loss of the
 Subsidiaries................................          49          (37)           --            (12)            --
Interest expense, net........................         275           10            (1)            --            284
Corporate service charge.....................        (319)         319            --             --             --
Other (income)/expense, net..................           7           (3)            1             --              5
Nonrecurring gain............................         (34)          --            --             --            (34)
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) Before Taxes on Income.......         (11)        (115)           54             12            (60)
Taxes on income/(income tax benefit).........          38          (61)           17             --             (6)
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) from Continuing Operations...         (49)         (54)           37             12            (54)
Discontinued operations......................         (41)           5            --             --            (36)
                                               -----------  -----------        -----         ------    -------------
Net Earnings/(Loss)..........................         (90)         (49)           37             12            (90)
                                               -----------  -----------        -----         ------    -------------
                                               -----------  -----------        -----         ------    -------------
</TABLE>

                                      F-29
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                     CONDENSED CONSOLIDATING BALANCE SHEET
                            AS OF DECEMBER 31, 1992
                          (DOLLAR AMOUNTS IN MILLIONS)
                                     ASSETS

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS  CONSOLIDATED
                                               -----------  -----------  -------------  ------------  -------------
<S>                                            <C>          <C>          <C>            <C>           <C>
Current Assets:
  Cash and cash equivalents..................   $      59    $      87     $      34     $       --     $     180
  Receivables (net of reserves)..............          65          219            40            (25)          299
  Inventories................................          --           82            34             (3)          113
 Restricted cash.............................          --           88            --             --            88
                                               -----------  -----------        -----    ------------  -------------
    Total current assets.....................         124          476           108            (28)          680
Property, Plant and Equipment, Net...........          19          664           117             --           800
Investment in Subsidiaries...................       1,073          133            --         (1,206)           --
Purchased Goodwill, Net......................          --           61             8             --            69
Other Assets.................................         (89)         214           (11)            (4)          110
                                               -----------  -----------        -----    ------------  -------------
    Total assets.............................       1,127        1,548           222         (1,238)        1,659
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable and accrued expenses......         538           91            39            (24)          644
  Notes payable and LTD maturing within one
   year......................................         570          141             7             --           718
  Long-term debt classified as current.......       1,926           --            --             --         1,926
                                               -----------  -----------        -----    ------------  -------------
    Total current liabilities................       3,034          232            46            (24)        3,288
Long-Term Debt...............................           1           38            28             --            67
Deferred Income Taxes........................         (36)         196            15             --           175
Other Long-Term Obligations..................          --            9            --             --             9
Stockholders' Equity/(Deficit):
  Common Stock...............................           5            2             5             (7)            5
  Capital received in excess of par value....          23        1,002            34         (1,036)           23
  Deferred currency translation..............          --           (2)           (6)            --            (8)
  Reinvested earnings/(deficit)..............      (1,900)          71           100           (171)       (1,900)
                                               -----------  -----------        -----    ------------  -------------
    Total stockholders' equity/(deficit).....      (1,872)       1,073           133         (1,214)       (1,880)
                                               -----------  -----------        -----    ------------  -------------
    Total liabilities and stockholders'
     equity..................................       1,127        1,548           222         (1,238)        1,659
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
</TABLE>

                                      F-30
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                     CONDENSED CONSOLIDATING BALANCE SHEET
                            AS OF DECEMBER 31, 1991
                          (DOLLAR AMOUNTS IN MILLIONS)
                                     ASSETS

<TABLE>
<CAPTION>
                                                 PARENT      COMBINED    COMBINED NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS  CONSOLIDATED
                                               -----------  -----------  -------------  ------------  -------------
<S>                                            <C>          <C>          <C>            <C>           <C>
Current Assets:
  Cash and cash equivalents..................   $      36    $      78     $      41     $       --     $     155
  Receivables (net of reserves)..............          74          170            54             --           298
  Inventories................................          --           74            39             (3)          110
  Restricted cash............................          --           84            --             --            84
                                               -----------  -----------        -----    ------------  -------------
    Total current assets.....................         110          406           134             (3)          647
Property, Plant and Equipment, Net...........          20          671           128             --           819
Investment in Subsidiaries...................       1,067          180            --         (1,247)           --
Purchased Goodwill, Net......................          --           64             9             --            73
Other Assets.................................        (124)         196            12              3            87
                                               -----------  -----------        -----    ------------  -------------
    Total assets.............................       1,073        1,517           283         (1,247)        1,626
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable and accrued expenses......         328           65            42             --           435
  Notes payable and LTD maturing within one
   year......................................         420          141            14             --           575
  Long-term debt classified as current.......       2,009           --            --             --         2,009
                                               -----------  -----------        -----    ------------  -------------
    Total current liabilities................       2,757          206            56             --         3,019
Long-Term Debt...............................          (1)          41            36             --            76
Deferred Income Taxes........................          (3)         193            10             --           200
Other Long-Term Obligations..................          --           11            --             --            11
Stockholders' Equity/(Deficit):..............
  Common Stock...............................           5            3             5             (8)            5
  Capital received in excess of par value....          24          767            34           (801)           24
  Deferred currency translation..............          --           (3)            3             --            --
  Reinvested earnings/(deficit)..............      (1,709)         299           139           (438)       (1,709)
                                               -----------  -----------        -----    ------------  -------------
    Total stockholders' equity/(deficit).....      (1,680)       1,066           181         (1,247)       (1,680)
                                               -----------  -----------        -----    ------------  -------------
    Total liabilities and stockholders'
     equity..................................       1,073        1,517           283         (1,247)        1,626
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
</TABLE>

                                      F-31
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                          YEAR ENDED DECEMBER 31, 1992
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                  PARENT        COMBINED      COMBINED NON-
                                                  COMPANY      GUARANTORS      GUARANTORS     ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  -------------  -----------------
<S>                                            <C>            <C>            <C>              <C>            <C>
NET CASH FLOWS (TO)/FROM OPERATING
 ACTIVITIES..................................    $     (93)     $     117       $      66       $      --        $      90
  Capital expenditures.......................           (1)           (39)             (9)             --              (49)
  Net proceeds from asset dispositions.......           --              2               4              --                6
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM INVESTING
 ACTIVITIES..................................           (1)           (37)             (5)             --              (43)
  Issuance of debt...........................           --             --              57              --               57
  Repayment of debt..........................           (4)            (2)            (69)             --              (75)
  Revolving Credit Facility..................           --             --              --              --               --
  Cash dividends (paid)/received.............           --             56             (56)             --               --
  Deposit of restricted cash.................           --             (4)             --              --               (4)
  Net cash transfers (to)/from Corporate.....          121           (121)             --              --               --
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................          117            (71)            (68)             --              (22)
Net Increase/(Decrease) in Cash & Cash
 Equivalents.................................           23              9              (7)             --               25
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at beginning of
 period......................................           36             78              41              --              155
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at end of period.....           59             87              34              --              180
                                                    ------         ------             ---     -------------          -----
                                                    ------         ------             ---     -------------          -----
</TABLE>

                                USG CORPORATION

                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                          YEAR ENDED DECEMBER 31, 1991
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                  PARENT        COMBINED      COMBINED NON-
                                                  COMPANY      GUARANTORS      GUARANTORS     ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  -------------  -----------------
<S>                                            <C>            <C>            <C>              <C>            <C>
NET CASH FLOWS (TO)/FROM OPERATING
 ACTIVITIES..................................    $    (216)     $     211       $      34       $      --        $      29
  Capital expenditures.......................           (1)           (33)            (15)             --              (49)
  Net proceeds from asset dispositions.......           --              4               1              --                5
  Net proceeds from divestiture of D.O.......           80             --              --              --               80
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM INVESTING
 ACTIVITIES..................................           79            (29)            (14)             --               36
  Issuance of debt...........................           --             --              65              --               65
  Repayment of debt..........................           (4)            (1)            (63)             --              (68)
  Revolving Credit Facility..................           --             --              --              --               --
  Cash dividends (paid)/received.............           10              9             (19)             --               --
  Deposit of restricted cash.................           --            (84)             --              --              (84)
  Net cash transfers (to)/from Corporate.....           34            (34)             --              --               --
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................           40           (110)            (17)             --              (87)
Net Cash Flows To Discontinued Operations....           --              2              --              --                2
Net Increase/(Decrease) in Cash & Cash Equiv-
 alents......................................          (97)            74               3              --              (20)
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at beginning of
 period......................................          133              4              38              --              175
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at end of period.....           36             78              41              --              155
                                                    ------         ------             ---     -------------          -----
                                                    ------         ------             ---     -------------          -----
</TABLE>

                                      F-32
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                          YEAR ENDED DECEMBER 31, 1990
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                  PARENT        COMBINED      COMBINED NON-
                                                  COMPANY      GUARANTORS      GUARANTORS     ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  -------------  -----------------
<S>                                            <C>            <C>            <C>              <C>            <C>
NET CASH FLOWS (TO)/FROM OPERATING
 ACTIVITIES..................................    $    (232)     $     248       $     (18)      $      --        $      (2)
  Capital expenditures.......................           --            (26)            (38)             --              (64)
  Net proceeds from asset dispositions.......           55             10              --              --               65
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM INVESTING
 ACTIVITIES..................................           55            (16)            (38)             --                1
  Issuance of debt...........................           --             --              60              --               60
  Repayment of debt..........................          (65)            (3)            (14)             --              (82)
  Revolving Credit Facility..................           --            140              --              --              140
  Cash dividends (paid)/received.............           68            (54)            (14)             --               --
  Deposit of restricted cash.................           --             --              --              --               --
  Net cash transfers (to)/from Corporate.....          304           (304)             --              --               --
                                                    ------         ------             ---     -------------          -----
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................          307           (221)             32              --              118
Net Cash Flows To Discontinued Operations....           --             (9)             --              --               (9)
Net Increase/(Decrease) in Cash & Cash Equiv-
 alents......................................          130              2             (24)             --              108
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at beginning of
 period......................................            3              2              62              --               67
                                                    ------         ------             ---     -------------          -----
Cash & cash equivalents at end of period.....          133              4              38              --              175
                                                    ------         ------             ---     -------------          -----
                                                    ------         ------             ---     -------------          -----
</TABLE>

GEOGRAPHIC AND INDUSTRY SEGMENTS

    See  "Business -- Properties of the Corporation" for information relating to
the operations of each industry segment.

    Transactions between geographic areas are accounted for on an "arm's-length"
basis. Export sales to foreign unaffiliated customers represent less than 10% of
consolidated net sales.

    Intrasegment and  intersegment  eliminations  largely  reflect  intercompany
sales from U.S. Gypsum to L&W Supply.

    No single customer accounted for 4% or more of consolidated net sales.

    Segment operating profit includes all costs and expenses directly related to
the  segment involved and an allocation of  expenses which benefit more than one
segment.

    To assist the reader in evaluating the profitability of each geographic  and
industry segment, EBITDA is shown separately in the following tables.

    Variations  in the levels of corporate identifiable assets primarily reflect
fluctuations in the levels of cash and cash equivalents. Restricted cash of  $88
million  and $84 million which represents the  proceeds from the sale of DAP are
included in corporate identifiable assets for 1992 and 1991, respectively.

    Geographic and industry segment data for 1991 and 1990 exclude  discontinued
operations.

    In  1990, restructuring expenses totaling  $18 million pre-tax were recorded
by the Corporation. These  expenses were allocated as  follows: U.S. Gypsum,  $7
million;  USG Interiors, $4  million; L&W Supply, $2  million; and Corporate, $5
million.

                                      F-33
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

<TABLE>
<CAPTION>
                                                                    DEPRECIATION
                                                    OPERATING       DEPLETION AND                       CAPITAL       IDENTIFIABLE
      1992 GEORGRAPHIC SEGMENTS        NET SALES     PROFIT         AMORTIZATION        EBITDA       EXPENDITURES        ASSETS
- -------------------------------------  ---------  -------------  -------------------  -----------  -----------------  -------------
                                                                       (DOLLAR AMOUNTS IN MILLIONS)
<S>                                    <C>        <C>            <C>                  <C>          <C>                <C>
United States:
  Gypsum Products....................  $     889    $      69         $      30        $      99       $      25        $     645
  Interior Systems...................        368           34                13               47              11              260
  Building Products Distribution.....        464            3                 2                5               3               95
  Intrasegment eliminations..........       (216)          --                --               --              --               --
  Corporate..........................         --          (30)                8              (28)              1              423
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,505           76                53              123              40            1,423
Canada...............................        149            7                 7               14               6               96
Other Foreign........................        208           16                 6               22               3              140
Transfers between geographic areas...        (85)          --                --               --              --               --
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,777           99                66              159              49            1,659
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
INDUSTRY SEGMENTS
Gypsum Products......................      1,068           85                38              123              31              764
Interior Systems.....................        548           41                18               59              14              377
Building Products Distribution.......        464            3                 2                5               3               95
Intersegment eliminations............       (303)          --                --               --              --               --
Corporate............................         --          (30)                8              (28)              1              423
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,777           99                66              159              49            1,659
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
</TABLE>

<TABLE>
<CAPTION>
                                                                    DEPRECIATION
                                                    OPERATING       DEPLETION AND                       CAPITAL       IDENTIFIABLE
      1991 GEOGRAPHIC SEGMENTS         NET SALES     PROFIT         AMORTIZATION        EBITDA       EXPENDITURES        ASSETS
- -------------------------------------  ---------  -------------  -------------------  -----------  -----------------  -------------
                                                                       (DOLLAR AMOUNTS IN MILLIONS)
<S>                                    <C>        <C>            <C>                  <C>          <C>                <C>
United States:
  Gypsum Products....................  $     835    $      64         $      29        $      93       $      23        $     627
  Interior Systems...................        386           47                12               59               9              263
  Building Products Distribution.....        424           --                 4                4               1               85
  Intrasegment eliminations..........       (212)          --                --               --              --               --
  Corporate..........................         --          (22)               10              (19)              1              383
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,433           89                55              137              34            1,358
Canada...............................        169           22                 7               29               3              111
Other Foreign........................        193           22                 6               28              12              157
Transfers between geographic areas...        (83)          --                --               --              --               --
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,712          133                68              194              49            1,626
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
INDUSTRY SEGMENTS
Gypsum Products......................      1,011           93                37              131              25              754
Interior Systems.....................        576           62                17               78              22              404
Building Products Distribution.......        424           --                 4                4               1               85
Intersegment eliminations............       (299)          --                --               --              --               --
Corporate............................         --          (22)               10              (19)              1              383
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,712          133                68              194              49            1,626
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
</TABLE>

                                      F-34
<PAGE>
                                USG CORPORATION

           SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES (CONTINUED)

<TABLE>
<CAPTION>
                                                                    DEPRECIATION
                                                    OPERATING       DEPLETION AND                       CAPITAL       IDENTIFIABLE
      1990 GEORGRAPHIC SEGMENTS        NET SALES     PROFIT         AMORTIZATION        EBITDA       EXPENDITURES        ASSETS
- -------------------------------------  ---------  -------------  -------------------  -----------  -----------------  -------------
                                                                       (DOLLAR AMOUNTS IN MILLIONS)
<S>                                    <C>        <C>            <C>                  <C>          <C>                <C>
United States:
  Gypsum Products....................  $     936    $     116         $      29        $     152       $      16        $     635
  Interior Systems...................        423           54                13               71               9              271
  Building Products Distribution.....        478            4                 6               12               1               89
  Intrasegment eliminations..........       (234)          --                --               --              --               --
  Corporate..........................         --          (35)               15              (24)              1              275
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,603          139                63              211              27            1,270
Canada...............................        195           31                 8               39              10              112
Other Foreign........................        200           25                 5               30              27              156
Transfers between geographic areas...        (83)          --                --               --              --               --
Discontinued operations..............         --           --                --               --              --              137
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,915          195                76              280              64            1,675
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
INDUSTRY SEGMENTS
Gypsum Products......................      1,134          148                39              194              25              765
Interior Systems.....................        624           78                16               98              37              409
Building Products Distribution.......        478            4                 6               12               1               89
Intersegment eliminations............       (321)          --                --               --              --               --
Corporate............................         --          (35)               15              (24)              1              275
Discontinued operations..............         --           --                --               --              --              137
                                       ---------        -----               ---            -----             ---      -------------
  Total..............................      1,915          195                76              280              64            1,675
                                       ---------        -----               ---            -----             ---      -------------
                                       ---------        -----               ---            -----             ---      -------------
</TABLE>

<TABLE>
<CAPTION>
TRANSFERS BETWEEN GEOGRAPHIC AREAS                                              1992            1991            1990
- ---------------------------------------------------------------------------  -----------  -----------------  -----------
                                                                                    (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                          <C>          <C>                <C>
United States..............................................................   $      35       $      34       $      34
Canada.....................................................................          23              22              22
Other Foreign..............................................................          27              27              27
                                                                             -----------          -----      -----------
  Total....................................................................          85              83              83
                                                                             -----------          -----      -----------
                                                                             -----------          -----      -----------
</TABLE>

                                USG CORPORATION

                               MANAGEMENT REPORT
Management is responsible  for the  preparation and integrity  of the  financial
statements  and  related  notes  included  herein.  These  statements  have been
prepared in accordance  with generally  accepted accounting  principles and,  of
necessity,  include some amounts  that are based  on management's best estimates
and judgments.

    The Corporation's accounting systems  include internal controls designed  to
provide reasonable assurance of the reliability of its financial records and the
proper  safeguarding  and  use  of  its  assets.  Such  controls  are  based  on
established policies and procedures, are  implemented by trained personnel,  and
are  monitored through an internal audit program. The Corporation's policies and
procedures prescribe that the Corporation  and its subsidiaries are to  maintain
ethical  standards and  that its  business practices  are to  be consistent with
those standards.

    The Audit Committee of the Board, consisting solely of outside Directors  of
the  Corporation, maintains an ongoing appraisal, on behalf of the stockholders,
of the effectiveness of the independent auditors and management with respect  to
the  preparation of financial statements, the  adequacy of internal controls and
the Corporation's accounting policies.

                                      F-35
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Stockholders and Board
  of Directors of USG Corporation:

We have audited the accompanying  consolidated balance sheet of USG  Corporation
(a  Delaware corporation) and subsidiaries as of  December 31, 1992 and 1991 and
the related consolidated statements of earnings  and cash flows for each of  the
three  years in the  period ended December 31,  1992. These financial statements
are the responsibility of the Corporation's management. Our responsibility is to
express an opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally  accepted   auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts and disclosures in the financial statements. An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the  financial statements referred to  above present fairly,  in
all   material  respects,  the   financial  position  of   USG  Corporation  and
subsidiaries as  of  December  31, 1992  and  1991,  and the  results  of  their
operations  and their cash flows for each of the three years in the period ended
December 31, 1992, in conformity with generally accepted accounting principles.

The accompanying consolidated financial  statements have been prepared  assuming
that  the Corporation will  continue as a  going concern. The  Corporation is in
default of various of its loan agreements  and does not expect to fund its  debt
service  requirements in 1993 without  restructuring its debt. Management's plan
to restructure its debt is discussed in the financial restructuring footnote  to
the  consolidated financial statements. As discussed in the litigation footnote,
in view  of the  current financial  circumstances of  the Corporation,  and  the
limited   insurance  funding  currently  available  for  property  damage  cases
resulting from the continued resistance by a number of U.S. Gypsum's insurers to
provide coverage, the effect of the asbestos litigation on the Corporation  will
depend  upon  a variety  of factors,  including the  damages sought  in property
damage cases that reach  trial prior to the  completion of the coverage  action,
U.S.  Gypsum's  ability to  successfully defend  or settle  such cases,  and the
resolution of  the  coverage  action.  As a  result,  management  is  unable  to
determine  whether an  adverse outcome  in the  asbestos litigation  will have a
material adverse  effect  on  the  results of  operations  or  the  consolidated
financial  position of the Corporation. These conditions raise substantial doubt
about the Corporation's ability to continue as a going concern. The accompanying
consolidated financial statements  do not  include any  adjustments relating  to
this uncertainty.

                                          ARTHUR ANDERSEN & CO.

Chicago, Illinois
February 9, 1993, except as
to the Subsequent Event note,
which is as of March 17, 1993.

                                      F-36
<PAGE>
                                USG CORPORATION

                 SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

<TABLE>
<CAPTION>
                                           FIRST      SECOND      THIRD      FOURTH      TOTAL
                                          QUARTER     QUARTER    QUARTER    QUARTER      YEAR
                                          --------   ---------   --------   --------   ---------
                                          (DOLLAR AMOUNTS IN MILLIONS EXCEPT PER SHARE FIGURES)
<S>                                       <C>        <C>         <C>        <C>        <C>
1992
Net sales...............................  $   426    $   441     $   474    $    436   $ 1,777
Gross profit............................       71         81          94          71       317
Operating profit........................       20         28          39          12        99
Net loss................................      (50)      (48)         (33)        (60)    (191)
Per common share:
  Net loss..............................     (.89)     (.87)        (.59)      (1.07)   (3.42)
  Price range* -- high..................        2      1 1/2       1 3/8         7/8         2
                low.....................        1        7/8       11/16         1/2       1/2
1991
Net sales...............................  $   416    $   434     $   445    $    417   $ 1,712
Gross profit............................       80         85          86          76       327
Operating profit........................       32         37          38          26       133
Loss from continuing operations.........      (35)      (31)         (32)        (43)    (141)
Net loss................................      (36)      (49)**       (33)        (43)    (161)**
Per common share:
  Loss from continuing operations.......     (.63)     (.56)        (.56)       (.78)   (2.53)
  Net loss..............................     (.66)     (.88)        (.59)       (.78)   (2.91)
  Price range* -- high..................        3      2 1/2       1 7/8       1 3/4         3
                low.....................    13/16      1 3/8       1 5/8       1 1/8      3/16
<FN>
- ------------------------
 *  Stock  price  ranges are  for transactions  on the  New York  Stock Exchange
    (trading symbol USG), which  is the principal  market for these  securities.
    Stockholders  of record as of February 26, 1993: Common -- 14,618; Preferred
    -- none.
**  Second quarter and  total year 1991  net loss figures  include an  after-tax
    provision of $20 million related to the divestiture of DAP.
</TABLE>

                                      F-37
<PAGE>
                                USG CORPORATION

                   COMPARATIVE FIVE-YEAR SUMMARY (UNAUDITED)

<TABLE>
<CAPTION>
                                                           1992       1991       1990       1989       1988
                                                         ---------  ---------  ---------  ---------  ---------
                                                             (DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER SHARE
                                                                               FIGURES)
<S>                                                      <C>        <C>        <C>        <C>        <C>
OPERATING ITEMS *
FOR YEARS ENDED DECEMBER 31:
  Net sales............................................  $   1,777  $   1,712  $   1,915  $   2,007  $   2,070
  Cost of products sold................................      1,460      1,385      1,499      1,506      1,536
  Gross profit.........................................        317        327        416        501        534
  Selling and administrative expenses..................        218        194        203        209        223
  Recapitalization and restructuring expenses..........         --         --         18         --         20
  Operating profit.....................................         99        133        195        292        291
  Interest expense.....................................        334        333        292        297        178
  Interest income......................................        (12)       (11)        (8)       (10)       (13)
  Other expense, net...................................          1          5          5         15         16
  Nonrecurring gains...................................         --         --        (34)       (33)        --
  Taxes on income/(income tax benefit).................        (33)       (53)        (6)         3         43
    % actual income tax/(benefit) rate.................      (15.0)     (27.5)      (9.8)      14.3       39.4
  Earnings/(loss) from continuing operations...........       (191)      (141)       (54)        20         67
  Net earnings/(loss)..................................       (191)      (161)       (90)        28        125
    % to average total capital employed................        9.5        5.3        6.5       18.2       15.7
  Per common share:
    Earnings/(loss) from continuing operations.........      (3.42)     (2.53)      (.99)       .37       1.26
    Net earnings/(loss)................................      (3.42)     (2.91)     (1.65)       .51       2.38
    Cash dividends.....................................         --         --         --         --        .56
  Capital expenditures.................................         49         49         64         76         81
FINANCIAL ITEMS *
AS OF DECEMBER 31:
  Working capital/(deficit)............................     (2,608)    (2,372)    (2,198)        51        102
  Current ratio........................................        .21        .21        .24       1.09       1.15
  Property, plant and equipment, net...................        800        819        825        837        859
  Total assets.........................................      1,659      1,626      1,675      1,585      1,806
  Total debt...........................................      2,711      2,660      2,600      2,428      2,643
  Total stockholders' equity/(deficit).................     (1,880)    (1,680)    (1,518)    (1,438)    (1,471)
  Market value per common share........................        .56       1.63        .81       4.50       5.63
Average number of employees............................     11,850     11,800     12,700     13,400     14,400
<FN>
- ------------------------
 *  Results  reflect DAP (sold  in 1991), the Marlite  Division of USG Interiors
    (sold in  1989), Wiss,  Janney,  Elstner Associates,  Inc. (sold  in  1989),
    Masonite  Corporation (sold in 1988) and the Kinkead Division (sold in 1988)
    as discontinued operations.
</TABLE>

                                      F-38
<PAGE>
                                                                      SCHEDULE V

                                USG CORPORATION
                         PROPERTY, PLANT AND EQUIPMENT

<TABLE>
<CAPTION>
                                                                                          BALANCE AT
                                                                                           BEGINNING   BALANCE AT
CLASSIFICATION                                                                              OF YEAR    END OF YEAR
- ----------------------------------------------------------------------------------------  -----------  -----------
                                                                                             (DOLLAR AMOUNTS IN
                                                                                                 MILLIONS)
<S>                                                                                       <C>          <C>
YEAR ENDED DECEMBER 31, 1990
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................   $      39    $      43
Buildings and realty improvements.......................................................         386          385
Machinery and equipment.................................................................         955          972
                                                                                          -----------  -----------
  Total.................................................................................       1,380        1,400
                                                                                          -----------  -----------
                                                                                          -----------  -----------
YEAR ENDED DECEMBER 31, 1991
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................          43           41
Buildings and realty improvements.......................................................         385          402
Machinery and equipment.................................................................         972        1,000
                                                                                          -----------  -----------
  Total.................................................................................       1,400        1,443
                                                                                          -----------  -----------
                                                                                          -----------  -----------
YEAR ENDED DECEMBER 31, 1992
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................          41           41
Buildings and realty improvements.......................................................         402          401
Machinery and equipment.................................................................       1,000        1,012
                                                                                          -----------  -----------
  Total.................................................................................       1,443        1,454
                                                                                          -----------  -----------
                                                                                          -----------  -----------
</TABLE>

    Detailed information  regarding  additions  and  deductions  is  omitted  as
neither  total additions nor  total deductions during each  of the periods shown
above exceeded  10% of  the balance  at the  end of  the related  period.  Total
additions  were $49 million, $49 million and $64 million in 1992, 1991 and 1990,
respectively. Total deductions were $38 million,  $6 million and $44 million  in
1992, 1991 and 1990, respectively.

    Total  deductions  include  foreign currency  translation  adjustments which
increased total deductions by $18 million in 1992 and decreased total deductions
by $1 million and $3 million in 1991 and 1990, respectively.

    Upon retirement or other  disposition of property,  the applicable cost  and
accumulated  depreciation and depletion are removed from the accounts. Any gains
and losses are included in earnings.

                                      F-39
<PAGE>
                                                                     SCHEDULE VI

                                USG CORPORATION
                   ACCUMULATED DEPRECIATION AND DEPLETION OF
                         PROPERTY, PLANT AND EQUIPMENT

<TABLE>
<CAPTION>
                                                                                           BALANCE AT
                                                                                          BEGINNING OF    BALANCE AT
CLASSIFICATION                                                                                YEAR        END OF YEAR
- ----------------------------------------------------------------------------------------  -------------  -------------
                                                                                          (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                                       <C>            <C>
YEAR ENDED DECEMBER 31, 1990
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................    $       6      $       7
Buildings and realty improvements.......................................................          139            141
Machinery and equipment.................................................................          398            427
                                                                                                -----          -----
  Total.................................................................................    $     543      $     575
                                                                                                -----          -----
                                                                                                -----          -----
YEAR ENDED DECEMBER 31, 1991
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................            7              7
Buildings and realty improvements.......................................................          141            147
Machinery and equipment.................................................................          427            470
                                                                                                -----          -----
  Total.................................................................................    $     575      $     624
                                                                                                -----          -----
                                                                                                -----          -----
YEAR ENDED DECEMBER 31, 1992
- ----------------------------------------------------------------------------------------
Land and mineral deposits...............................................................            7              7
Buildings and realty improvements.......................................................          147            155
Machinery and equipment.................................................................          470            492
                                                                                                -----          -----
  Total.................................................................................    $     624      $     654
                                                                                                -----          -----
                                                                                                -----          -----
</TABLE>

    Detailed information  regarding  additions  and  deductions  is  omitted  as
neither  total additions nor  total deductions of  property, plant and equipment
(see Schedule V)  during each of  the periods  shown above exceeded  10% of  the
balance of property, plant and equipment at the end of the related period. Total
provisions  for depreciation and depletion were $58 million, $57 million and $60
million in 1992, 1991 and 1990, respectively. Total deductions were $28 million,
$8 million and $28 million in 1992, 1991 and 1990, respectively.

    Total deductions  include  foreign currency  translation  adjustments  which
increased total deductions by $10 million in 1992 and decreased total deductions
by $1 million in each of the years 1991 and 1990.

    Upon  retirement or other  disposition of property,  the applicable cost and
accumulated depreciation and depletion are removed from the accounts. Any  gains
and losses are included in earnings.

                                      F-40
<PAGE>
                                                                   SCHEDULE VIII

                                USG CORPORATION
                       VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
                                                                                PROVISION       RECEIVABLES
                                                              BALANCE AT       CHARGED TO       WRITTEN OFF      BALANCE AT
                                                               BEGINNING        COSTS AND      AND DISCOUNTS       END OF
ACCOUNT                                                         OF YEAR         EXPENSES          ALLOWED           YEAR
- ----------------------------------------------------------  ---------------  ---------------  ---------------  ---------------
<S>                                                         <C>              <C>              <C>              <C>
YEAR ENDED DECEMBER 31, 1990
- ----------------------------------------------------------
Doubtful accounts.........................................     $       8        $       8        $     (10)       $       6
Cash discounts............................................             3               34              (35)               2
YEAR ENDED DECEMBER 31, 1991
- ----------------------------------------------------------
Doubtful accounts.........................................             6                7               (6)               7
Cash discounts............................................             2               23              (23)               2
YEAR ENDED DECEMBER 31, 1992
- ----------------------------------------------------------
Doubtful accounts.........................................             7                7               (5)               9
Cash discounts............................................             2               24              (24)               2
</TABLE>

                                      F-41
<PAGE>
                                                                     SCHEDULE IX

                                USG CORPORATION
                             SHORT-TERM BORROWINGS

<TABLE>
<CAPTION>
                                                                                MAXIMUM          AVERAGE         WEIGHTED
                                                                                AMOUNT           AMOUNT           AVERAGE
                                                BALANCE       WEIGHTED        OUTSTANDING      OUTSTANDING       INTEREST
CATEGORY OF AGGREGATE                          AT END OF       AVERAGE        DURING THE       DURING THE       RATE DURING
SHORT-TERM BORROWINGS                          THE YEAR     INTEREST RATE        YEAR            YEAR(A)        THE YEAR(B)
- --------------------------------------------  -----------  ---------------  ---------------  ---------------  ---------------
                                                                       (DOLLAR AMOUNTS IN MILLIONS)
<S>                                           <C>          <C>              <C>              <C>              <C>
YEAR ENDED DECEMBER 31, 1990
- --------------------------------------------
Notes payable (c)...........................   $      16          11.4%        $      16        $       5            11.9%
Revolving Credit Facility (d)...............         140          11.0               140               61            11.0
YEAR ENDED DECEMBER 31, 1991
- --------------------------------------------
Notes payable (c)...........................           8           8.5                19               15            10.5
Revolving Credit Facility (d)...............         140          12.8               140              140            13.3
YEAR ENDED DECEMBER 31, 1992
- --------------------------------------------
Notes payable (c)...........................           2          10.6                12                7             8.0
Revolving Credit Facility (d)...............         140          10.0               140              140            11.2
<FN>
- ------------------------
(a) Computed by dividing the total of month-end principal balances by 12.
(b) Computed  by  dividing  annual interest  expense  by the  average  amount of
    short-term borrowings outstanding.
(c) Represents borrowings from several foreign banks by USG International  which
    is generally not subject to the provisions of the Current Credit Agreement.
(d) The  Current  Credit  Agreement  includes a  $200  million  Revolving Credit
    Facility, of  which  $70  million  is established  as  a  letter  of  credit
    subfacility.  Under  the  Amended  Credit  Agreement,  the  Revolving Credit
    Facility will be reduced to $175 million.
</TABLE>

                                      F-42
<PAGE>
                                                                      SCHEDULE X

                                USG CORPORATION
                 SUPPLEMENTAL STATEMENT OF EARNINGS INFORMATION

    The following amounts were charged to costs and expenses:

<TABLE>
<CAPTION>
                                                                                        YEARS ENDED DECEMBER 31
                                                                                   ---------------------------------
                                                                                     1992        1991        1990
                                                                                   ---------     -----     ---------
                                                                                   (DOLLAR  AMOUNTS   IN   MILLIONS)
<S>                                                                                <C>        <C>          <C>
Maintenance and repairs..........................................................  $     105   $      99   $     105
Depreciation, depletion and amortization.........................................         66          68          76
</TABLE>

    Maintenance and repairs are treated as costs or expenses when incurred.

    Taxes (excluding payroll and income taxes), rents, royalties and advertising
costs  are not shown above as individually they do not exceed one percent of net
sales in any of the three years.

                                      F-43
<PAGE>
                 SUPPLEMENTAL NOTE ON FINANCIAL INFORMATION FOR
                          UNITED STATES GYPSUM COMPANY
                       (A SUBSIDIARY OF USG CORPORATION)

    USG Corporation,  a holding  company, owns  several operating  subsidiaries,
including  U.S. Gypsum. On  January 1, 1985,  all of the  issued and outstanding
shares of stock of U.S. Gypsum were converted into shares of the Corporation and
the Corporation  became  a joint  and  several obligor  for  certain  debentures
originally  issued by U.S. Gypsum. As  of December 31, 1992, debentures totaling
$41 million were  recorded on the  holding company's books  of account  compared
with  $45 million as of December 31, 1991. Financial results for U.S. Gypsum are
presented below in accordance with disclosure requirements of the SEC.

                         SUMMARY STATEMENT OF EARNINGS

<TABLE>
<CAPTION>
                                                                                            YEARS ENDED DECEMBER 31
                                                                                        -------------------------------
                                                                                          1992       1991       1990
                                                                                        ---------  ---------  ---------
                                                                                         (DOLLAR AMOUNTS IN MILLIONS)
<S>                                                                                     <C>        <C>        <C>
Net sales.............................................................................  $     871  $     822  $     928
Cost and expenses.....................................................................        801        759        813
                                                                                        ---------  ---------  ---------
Operating profit......................................................................         70         63        115
Other income, net.....................................................................         (2)        (1)        (3)
Interest expense, net.................................................................          2          4         --
Corporate charges.....................................................................        188        173        160
                                                                                        ---------  ---------  ---------
Loss before taxes on income...........................................................       (118)      (113)       (42)
Income tax benefit....................................................................        (44)       (43)       (20)
                                                                                        ---------  ---------  ---------
Net loss..............................................................................  $     (74) $     (70) $     (22)
                                                                                        ---------  ---------  ---------
                                                                                        ---------  ---------  ---------
</TABLE>

                             SUMMARY BALANCE SHEET

<TABLE>
<CAPTION>
                                                                                         AS OF DECEMBER 31
                                                                                        --------------------
                                                                                          1992       1991
                                                                                        ---------  ---------
                                                                                         (DOLLAR AMOUNTS IN
                                                                                             MILLIONS)
<S>                                                                                     <C>        <C>
Current assets........................................................................  $     192  $     168
Property, plant and equipment, net....................................................        511        517
Other assets..........................................................................          7          7
                                                                                        ---------  ---------
    Total assets......................................................................  $     710  $     692
                                                                                        ---------  ---------
                                                                                        ---------  ---------
Current liabilities...................................................................         32         44
Other liabilities and obligations.....................................................        193        220
Stockholder's equity..................................................................        485        428
                                                                                        ---------  ---------
    Total liabilities and stockholder's equity........................................  $     710  $     692
                                                                                        ---------  ---------
                                                                                        ---------  ---------
</TABLE>

                                      F-44
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
      WITH RESPECT TO SUPPLEMENTAL NOTE AND FINANCIAL STATEMENT SCHEDULES

    We  have audited in  accordance with generally  accepted auditing standards,
the financial statements of USG Corporation included in the Form 10-K, and  have
issued  our report thereon dated February 9,  1993. Our audits were made for the
purpose of  forming an  opinion on  the basic  financial statements  taken as  a
whole.  The supplemental  note and financial  statement schedules  on pages F-39
through F-44 are  presented for purposes  of complying with  the Securities  and
Exchange  Commission's rules and are not part of the basic financial statements.
The supplemental note and financial  statement schedules have been subjected  to
the  auditing procedures applied in the audits of the basic financial statements
and, in our opinion,  fairly state in all  material respects the financial  data
required  to be set forth therein in  relation to the basic financial statements
taken as a whole.

                                          ARTHUR ANDERSEN & CO.
Chicago, Illinois
February 9, 1993

                                      F-45
<PAGE>
                                USG CORPORATION
              CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS
                 FOR THE THREE MONTHS ENDED SEPTEMBER 30, 1993,
                        MAY 7 THROUGH JUNE 30, 1993 AND
                         JANUARY 1 THROUGH MAY 6, 1993
                                  (UNAUDITED)

                                      F-46
<PAGE>
                                USG CORPORATION
                       CONSOLIDATED STATEMENT OF EARNINGS
             (DOLLAR AMOUNTS IN MILLIONS EXCEPT PER-SHARE FIGURES)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                         1993 (A)                 1993                    1992
                                               -----------------------------   -----------   -------------------------------
                                               THREE MONTHS        MAY 7        JANUARY 1     THREE MONTHS     NINE MONTHS
                                                   ENDED          THROUGH        THROUGH         ENDED            ENDED
                                               SEPTEMBER 30       JUNE 30         MAY 6       SEPTEMBER 30     SEPTEMBER 30
                                               -------------   -------------   -----------   --------------   --------------
<S>                                            <C>             <C>             <C>           <C>              <C>
Net Sales....................................  $        514    $         315   $      591    $         474    $       1,341
Cost of products sold........................           409              252          482              380            1,095
                                               -------------   -------------        -----            -----          -------
Gross Profit.................................           105               63          109               94              246
Selling and administrative expenses..........            56               36           71               55              159
Amortization of excess reorganization
 value.......................................            43               28           --               --               --
                                               -------------   -------------        -----            -----          -------
Operating Profit/(Loss)......................             6               (1)          38               39               87
Interest expense.............................            34               22           86               81              253
Interest income..............................            (2)              (1)          (2)              (3)              (8)
Other (income)/expense, net..................            (4)              (2)           6                1               --
Reorganization items.........................            --               --         (709)              --               --
                                               -------------   -------------        -----            -----          -------
Earnings/(Loss) Before Taxes on Income,
 Extraordinary Gain and Changes in Accounting
 Principles..................................           (22)             (20)         657              (40)            (158)
Taxes on income/(income tax benefit).........             3                1           17               (7)             (27)
                                               -------------   -------------        -----            -----          -------
Earnings/(Loss) Before Extraordinary Gain and
 Changes in Accounting Principles............           (25)             (21)         640              (33)            (131)
Extraordinary gain, net of taxes.............            --               --          944               --               --
Cumulative effect of changes in accounting
 principles, net.............................            --               --         (150)              --               --
                                               -------------   -------------        -----            -----          -------
Net Earnings/(Loss)..........................           (25)             (21)       1,434              (33)            (131)
                                               -------------   -------------        -----            -----          -------
                                               -------------   -------------        -----            -----          -------
Average number of common shares (b)..........    37,157,482       37,157,458
                                               -------------   -------------
                                               -------------   -------------
Net Loss Per Common Share (b)................     $(0.66)         $(0.57)
Dividends paid per common share..............            --               --
                                               -------------   -------------
                                               -------------   -------------
Other Information:
  Operating profit/(loss)....................  $          6    $          (1)  $       38    $          39    $          87
  Amortization of excess reorganization
   value.....................................            43               28           --               --               --
  Depreciation and depletion.................            14                8           20               14               42
  Other......................................             2                2            5                1                3
                                               -------------   -------------        -----            -----          -------
    EBITDA...................................  $         65    $          37   $       63    $          54    $         132
                                               -------------   -------------        -----            -----          -------
                                               -------------   -------------        -----            -----          -------
<FN>
- ------------------------
(a)   Due to  the Restructuring  and implementation  of fresh  start  reporting,
      financial  statements  effective May  7,  1993 for  the newly-restructured
      company are not comparable to financial statements prior to that date  for
      the  predecessor company. See "Notes  to Consolidated Financial Statements
      -- Note (3)" for more information on the Restructuring and  implementation
      of fresh start reporting.
(b)   Common  shares and  per share data  for periods  prior to May  7, 1993 are
      omitted because,  due to  the Restructuring  and implementation  of  fresh
      start reporting, they are not meaningful.
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.

                                      F-47
<PAGE>
                                USG CORPORATION
                           CONSOLIDATED BALANCE SHEET
                          (DOLLAR AMOUNTS IN MILLIONS)
                                  (UNAUDITED)
                                     ASSETS

<TABLE>
<CAPTION>
                                                                   AS OF            AS OF
                                                               SEPTEMBER 30,     DECEMBER 31,
                                                                 1993 (A)            1992
                                                              ---------------   --------------
<S>                                                           <C>               <C>
Current Assets:
Cash and cash equivalents...................................  $          157    $         180
Receivables (net of reserves -- 1993 $13; 1992 $11).........             292              299
Inventories.................................................             147              113
Restricted cash.............................................              --               88
                                                                     -------          -------
    Total current assets....................................             596              680
Property, Plant and Equipment (net of reserves for
 depreciation and depletion -- 1993 $22; 1992 $654).........             754              800
Excess Reorganization Value, Net............................             776               --
Purchased Goodwill, Net.....................................              --               69
Other Assets................................................              60              110
                                                                     -------          -------
    Total assets............................................  $        2,186    $       1,659
                                                                     -------          -------
                                                                     -------          -------
                             LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
Accounts payable............................................  $          101    $          91
Accrued expenses............................................             211              553
Notes payable...............................................               8                2
Revolving credit facility...................................              --              140
Long-term debt maturing within one year.....................               6              576
Long-term debt classified as current........................              --            1,926
Taxes on income.............................................              14               --
                                                                     -------          -------
    Total current liabilities...............................             340            3,288
Long-Term Debt..............................................           1,439               67
Deferred Income Taxes.......................................             173              175
Other Liabilities...........................................             286                9
Stockholders' Equity/(Deficit):
Preferred stock.............................................              --               --
Common stock................................................               4                5
Capital received in excess of par value.....................              --               23
Deferred currency translation...............................             (10)              (8)
Reinvested earnings/(deficit)...............................             (46)          (1,900)
                                                                     -------          -------
    Total stockholders' equity/(deficit)....................             (52)          (1,880)
                                                                     -------          -------
    Total liabilities and stockholders' equity..............  $        2,186    $       1,659
                                                                     -------          -------
                                                                     -------          -------
<FN>
- ------------------------
(a)   Due  to  the Restructuring  and implementation  of fresh  start reporting,
      financial statements  effective May  7,  1993 for  the  newly-restructured
      company  are not comparable to financial statements prior to that date for
      the predecessor company. See  "Notes to Consolidated Financial  Statements
      --  Note (3)" for more information on the Restructuring and implementation
      of fresh start reporting.
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.

                                      F-48
<PAGE>
                                USG CORPORATION
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                          (DOLLAR AMOUNTS IN MILLIONS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                              MAY 7         JANUARY 1      NINE MONTHS
                                                             THROUGH         THROUGH          ENDED
                                                          SEPTEMBER 30,      MAY 6,       SEPTEMBER 30,
                                                            1993 (A)          1993            1992
                                                         ---------------   -----------   ---------------
                                                                           (UNAUDITED)
<S>                                                      <C>               <C>           <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings/(loss)....................................  $          (46)   $    1,434    $         (131)
Adjustments to reconcile net earnings/(loss) to net
 cash:
  Amortization of excess reorganization value..........              71            --                --
  Cumulative effect of accounting changes..............              --           150                --
  Depreciation, depletion and other amortization.......              29            22                50
  Postretirement expense, net..........................               4             4                --
  Interest expense on pay-in-kind debentures...........              --            17                54
  Deferred income taxes................................               3           (13)              (35)
  Net (gain)/loss on asset dispositions................              (7)            4                (5)
(Increase)/decrease in working capital:
  Receivables..........................................              23            18               (32)
  Inventories..........................................               1            (8)              (12)
  Payables.............................................               5             3                10
  Accrued expenses.....................................              40            15               164
(Increase)/decrease in other assets....................               4           (12)              (19)
Increase/(decrease) in other liabilities...............               2            --                (2)
Changes due to reorganization items:
  Increase in reorganization items.....................              --            65                --
  Net adjustments to fair market value.................              --          (759)               --
  Gain on discharge of prepetition liabilities.........              --          (944)               --
  Payment of liabilities net of collection of letters
   of credit...........................................              --            (7)               --
Other, net.............................................              (3)           (3)                1
                                                                  -----    -----------           ------
  Net cash flows (to)/from operating activities........             126           (14)               43
                                                                  -----    -----------           ------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures...................................             (16)          (12)              (27)
Net proceeds from asset dispositions...................               9            --                 6
                                                                  -----    -----------           ------
  Net cash flows to investing activities...............              (7)          (12)              (21)
                                                                  -----    -----------           ------
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of debt.......................................              26             5                57
Repayment of debt......................................             (37)         (142)              (68)
(Increase)/decrease in restricted assets...............              --            32                (3)
                                                                  -----    -----------           ------
  Net cash flows to financing activities...............             (11)         (105)              (14)
                                                                  -----    -----------           ------
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS...             108          (131)                8
                                                                  -----    -----------           ------
Cash and cash equivalents as of beginning of period....              49           180               155
                                                                  -----    -----------           ------
Cash and cash equivalents as of end of period..........  $          157    $       49    $          163
                                                                  -----    -----------           ------
                                                                  -----    -----------           ------
SUPPLEMENTAL CASH FLOW DISCLOSURES:
Interest paid..........................................              34            58                42
Income taxes paid......................................  $            3    $        3    $            8
                                                                  -----    -----------           ------
                                                                  -----    -----------           ------
<FN>
- ------------------------
(a)   Due to  the Restructuring  and implementation  of fresh  start  reporting,
      financial  statements  effective May  7,  1993 for  the newly-restructured
      company are not comparable to financial statements prior to that date  for
      the  predecessor company. See "Notes  to Consolidated Financial Statements
      -- Note (3)" for more information on the Restructuring and  implementation
      of fresh start reporting.
</TABLE>

          See accompanying Notes to Consolidated Financial Statements.

                                      F-49
<PAGE>
                                USG CORPORATION

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                                  (UNAUDITED)

    (1)  USG Corporation and its  subsidiaries' ("THE CORPORATION") consolidated
financial statements included herein  have been prepared  pursuant to the  rules
and  regulations of  the Securities and  Exchange Commission. In  the opinion of
management, the  statements  reflect all  adjustments,  which are  of  a  normal
recurring  nature,  necessary  to  present  fairly  the  Corporation's financial
position as of September 30, 1993  and December 31, 1992; results of  operations
for the three months ended September 30, 1993, the periods of May 7 through June
30,  1993 and January 1 through  May 6, 1993, and for  the three months and nine
months ended September 30, 1992; and cash flows for the periods of May 7 through
September 30, 1993, and January 1 through  May 6, 1993, and for the nine  months
ended   September  30,  1992.  While  these  interim  financial  statements  and
accompanying notes are unaudited, they have  been reviewed by Arthur Andersen  &
Co.,   the  Corporation's   independent  public   accountants.  These  financial
statements are to be read in conjunction with the financial statements and notes
included in the Corporation's  1992 Annual Report on  Form 10-K dated March  26,
1993.

    (2)  EBITDA  is traditionally  defined as  earnings before  interest, taxes,
depreciation, depletion and  amortization. For 1993,  the Corporation also  adds
back  non-cash  postretirement charges,  reorganization items,  an extraordinary
gain and  the  cumulative  impact  of  changes  in  accounting  principles.  The
Corporation  believes that EBITDA is a useful supplement to net income and other
consolidated statement of  earnings data  as an indicator  of the  Corporation's
operating  performance and is helpful in  understanding cash flow generated from
operations that is available for  taxes, debt service and capital  expenditures.
In addition, EBITDA for the Corporation's domestic operations (disclosed in Part
I,  Item 2.  "Management's Discussion  and Analysis  of Financial  Condition and
Results of  Operations --  Results of  Operations by  Segment") facilitates  the
monitoring  of covenants related to certain  long-term debt and other agreements
entered into in conjunction with the Restructuring.

    (3) On May 6, 1993, the Corporation completed a comprehensive  restructuring
of  its debt (the "RESTRUCTURING") through the implementation of a "prepackaged"
plan of reorganization  (the "PLAN  OF REORGANIZATION") which  was confirmed  on
April  23,  1993 by  the  United States  Bankruptcy  Court for  the  District of
Delaware  (the  "BANKRUPTCY  COURT").  Under  the  Plan  of  Reorganization  all
previously  existing defaults upon senior securities  were waived or cured. None
of the subsidiaries of  the Corporation were part  of the bankruptcy  proceeding
and  there was no  impact on trade creditors  of the Corporation's subsidiaries.
The Corporation accounted for  the Restructuring using  the principles of  fresh
start  reporting as  required by  AICPA Statement  of Position  90-7, "Financial
Reporting by Entities in Reorganization under the Bankruptcy Code" ("SOP 90-7").
Pursuant to such principles, individual assets and liabilities were adjusted  to
fair market value as of May 6, 1993. The portion of the reorganization value not
attributable  to  specific  assets  ("EXCESS  REORGANIZATION  VALUE")  is  being
amortized over a five year period, effective May 7, 1993. See the  Corporation's
Second  Quarter,  1993  Report on  Form  10-Q  dated August  12,  1993  for more
information on the terms  and implementation of the  Plan of Reorganization  and
fresh start reporting.

    (4) The following unaudited Pro Forma Consolidated Statement of Earnings for
the  nine months ended September 30, 1993 has been prepared giving effect to the
consummation of the Plan of Reorganization, including the costs related thereto,
in accordance with SOP 90-7, as if  the consummation had occurred on January  1,
1993.  Due to  the Restructuring  and implementation  of fresh  start reporting,
financial statements effective  May 7, 1993  for the newly-restructured  company
are  not  comparable  to  financial  statements  prior  to  that  date  for  the
predecessor company. However,  for presentation of  this statement, results  for
the  first  nine  months of  1993  are  shown under  the  caption  "Total Before
Adjustments."  The  adjustments   set  forth  under   the  caption  "Pro   Forma
Adjustments"  reflect the assumed effects of  the Restructuring and the adoption
of fresh start reporting prescribed by SOP 90-7.

                                      F-50
<PAGE>
                                USG CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                  (UNAUDITED)

                  PRO FORMA CONSOLIDATED STATEMENT OF EARNINGS
                      NINE MONTHS ENDED SEPTEMBER 30, 1993
                          (DOLLAR AMOUNTS IN MILLIONS)
                                  (UNAUDITED)

<TABLE>
<CAPTION>
                                                                  TOTAL
                                                                 BEFORE
                                                               ADJUSTMENTS     ADJUSTMENTS      PRO FORMA
                                                              -------------   --------------   -----------
<S>                                                           <C>             <C>              <C>
Net sales...................................................  $      1,420             --      $    1,420
Cost of products sold.......................................         1,143            --            1,143
                                                              -------------      -------       -----------
Gross profit................................................           277            --              277
Selling and administrative expense..........................           163            --              163
Amortization of excess reorganization value.................            71            57(a)           128
                                                              -------------      -------       -----------
Operating profit/(loss).....................................            43           (57)             (14)
Interest expense............................................           142           (42)(b)          100
Interest income.............................................            (5)           --               (5)
Other (income)/expense, net.................................            --            (1)(c)           (1)
Reorganization items........................................          (709)          709(d)            --
                                                              -------------      -------       -----------
Earnings/(loss) before taxes on income,                                             (723)
 extraordinary gain and changes in
 accounting principles......................................           615                           (108)
Taxes on income.............................................            21           (16)               5
                                                              -------------      -------       -----------
Earnings/(loss) before extraordinary gain and changes in                            (707)
 accounting principles......................................           594                           (113)
                                                              -------------      -------       -----------
                                                              -------------      -------       -----------
<FN>
- ------------------------
(a) Reflects amortization of Excess Reorganization  Value which would have  been
    recorded during the period of January 1 through May 6, 1993.
(b) Reflects  the  adjustment  to restate  interest  expense for  the  period of
    January 1 through May 6, 1993 to the amount that would have been recorded.
(c) Represents the reversal  of first  quarter 1993  amortization of  historical
    capitalized  financing costs which  were written off  in connection with the
    Restructuring.
(d) Represents  the  reversal  of   actual  reorganization  items  incurred   in
    connection   with  the  Restructuring  and  implementation  of  fresh  start
    reporting. This gain would have been recorded in 1992 had the  Restructuring
    occurred on January 1, 1993.
</TABLE>

    (5)  In connection with  the Restructuring, the  Corporation recorded in the
period of January 1 through May 6, 1993 a one-time reorganization items gain  of
$709  million, which primarily consisted of  an $851 million gain from recording
the Excess Reorganization Value pursuant to SOP 90-7.

    (6) Also in connection with  the Restructuring, the Corporation recorded  in
the  period of January 1 through May  6, 1993 a one-time after-tax extraordinary
gain of $944 million resulting primarily from the exchange of subordinated  debt
for stock and warrants.

    (7)  Effective  January  1,  1993,  the  Corporation  adopted  Statement  of
Accounting Standards ("SFAS") No. 106, "Employers' Accounting for Postretirement
Benefits Other Than Pensions,"  for its U.S. retiree  benefit plans. Under  this
standard,   the  Corporation  is  required  to  accrue  the  estimated  cost  of

                                      F-51
<PAGE>
                                USG CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                  (UNAUDITED)
retiree benefit payments, other than pensions, during employees' active  service
period.  The Corporation previously  expensed the cost  of these benefits, which
are principally health care, as claims were incurred. The Corporation elected to
recognize this  change in  accounting principles  on the  immediate  recognition
basis.  The cumulative effect as of January 1, 1993 of adopting SFAS No. 106 was
a one-time charge to first quarter 1993 net earnings of $180 million.

    (8) Effective  January  1,  1993,  the Corporation  adopted  SFAS  No.  109,
"Accounting  for Income Taxes." The  cumulative effect as of  January 1, 1993 of
adopting SFAS No. 109 was a one-time benefit to first quarter 1993 net  earnings
of  $30 million  primarily due  to adjusting  deferred taxes  from historical to
current tax rates.  Financial statements for  periods prior to  January 1,  1993
have not been restated to reflect the adoption of this standard.

    The  effective income  tax rate  was 9.5%  for the  period of  May 7 through
September 30, 1993 due to tax expense on foreign subsidiary earnings, no benefit
for the amortization of  excess reorganization value,  the inability to  benefit
the domestic net operating loss and a one-time charge in the third quarter of $3
million to adjust deferred taxes for the increase in the statutory tax rate from
34%  to 35%. The effective income tax rate  was 2.6% for the period of January 1
through May  6,  1993  due  to  tax  expense  on  foreign  subsidiary  earnings,
adjustment for the nontaxable effects of adopting fresh start accounting and the
inability  to benefit the domestic net operating  loss. For the three months and
nine months ended  September 30, 1992,  the effective income  tax benefit  rates
were 17.5% and 17.1%, respectively.

    The  Corporation has net operating  loss carryforwards ("NOL CARRYFORWARDS")
of $14 million and  $150 million for 1991  and 1992, respectively. The  Internal
Revenue  Code (the "CODE")  will limit the  Corporation's annual use  of its NOL
Carryforwards as  a  result  of  consummation of  the  Plan  of  Reorganization.
Furthermore, due to the uncertainty regarding the application of the Code to the
exchange  of stock for debt, the Corporation could be required to reduce its NOL
Carryforwards by the amount of the cancellation of indebtedness from the Plan of
Reorganization. If the Corporation is required to reduce all or a portion of its
NOL Carryforwards, annual reductions  in U.S. federal  income taxes which  would
otherwise  result  from  use of  these  NOL  Carryforwards would  be  smaller or
eliminated altogether. The  Corporation believes that  to the extent  it is  not
required  to reduce its NOL Carryforwards, it  will be able to use approximately
$30 million of the NOL Carryforwards each year to offset federal taxable  income
otherwise generated after consummation of the Plan of Reorganization.

    (9)  Inventories totaled $147  million and $113 million  as of September 30,
1993 and December 31, 1992,  respectively. In accordance with implementation  of
fresh  start reporting, the historical balances  of inventories were adjusted to
fair market value as of May 6, 1993. Inventories are valued predominantly  under
the  last-in, first-out ("LIFO") method of accounting. Inventory classifications
were as follows (in million of dollars):

<TABLE>
<CAPTION>
                                                                AS OF            AS OF
                                                            SEPTEMBER 30,    DECEMBER 31,
                                                                1993             1992
                                                           ---------------  ---------------
<S>                                                        <C>              <C>
Finished goods and work-in-process.......................     $      87        $      66
Raw materials............................................            53               40
Supplies.................................................             7                7
                                                                  -----            -----
Total inventories........................................     $     147        $     113
                                                                  -----            -----
                                                                  -----            -----
</TABLE>

    If all inventories were  valued under the  first-in, first-out ("FIFO")  and
average  production cost methods, inventories would have been $1 million and $25
million higher than  those reported as  of September 30,  1993 and December  31,
1992, respectively.

                                      F-52
<PAGE>
                                USG CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                  (UNAUDITED)

    (10)   On August  10, 1993, the  Corporation issued $138  million of 10 1/4%
Senior Notes due 2002, Series B (the "NEW 10 1/4% SENIOR NOTES") in exchange for
$92 million of bank term loans originally due 1994 through 1996 and $46  million
of  capitalized  interest  notes  originally due  2000.  The  exchange  was made
pursuant to  the  Corporation's  Registration  Statement  on  Form  S-1  bearing
Registration  No.  33-65804 with  the Securities  and Exchange  Commission which
included a prospectus related to  the offering. This registration statement  was
declared  effective on July 29,  1993. The Corporation did  not receive any cash
proceeds from the issuance of these securities.

    In connection  with  the  issuance of  the  New  10 1/4  Senior  Notes,  the
Corporation's  bank  term loan  credit  agreement (the  "CREDIT  AGREEMENT") was
modified, providing  for the  following changes:  (i) scheduled  bank term  loan
amortization  payments of $95 million due in 1994, 1995 and 1996 were eliminated
($3 million was added to  the final maturity bank term  loan due in 2000);  (ii)
USG  Interiors paid $9  million of capitalized interest  notes originally due in
1998; and  (iii) the  cash sweep  mechanism was  modified to  apply up  to  $165
million  of cash otherwise subject to the cash sweep mechanism in 1994, 1995 and
1996 to repayment or  purchase of senior  debt due prior to  January 1, 1999  or
bank term loans, at the discretion of the Corporation.

    (11)   Pursuant to the Plan of Reorganization, all stock options existing as
of May 6, 1993 were cancelled without consideration. As permitted by the Plan of
Reorganization, 2,788,350 common  shares were  reserved for  future issuance  in
conjunction with stock options, all of which remained in reserve as of September
30,  1993. Options  for 1,673,000  common shares were  granted on  June 1, 1993,
leaving an additional 1,115,350 common shares available for future grants.

    (12)  One of the Corporation's operating subsidiaries, United States  Gypsum
Company  ("U.S.  GYPSUM"), is  a defendant  in  asbestos lawsuits  alleging both
property damage and  personal injury.  This litigation  has not  had a  material
effect  on the Corporation's  liquidity or earnings. Virtually  all costs of the
Personal Injury  Cases  are being  paid  by  insurance. However,  many  of  U.S.
Gypsum's  insurance carriers are denying coverage for the Property Damage Cases,
although U.S. Gypsum  believes that  substantial coverage exists  and the  trial
court  in  U.S. Gypsum's  Coverage Action  has  so ruled  (such ruling  has been
appealed). In view of the limited insurance funding currently available to  U.S.
Gypsum for Property Damage Cases resulting from continued resistance by a number
of  U.S. Gypsum's  insurers to  providing coverage,  the effect  of the asbestos
litigation on the Corporation will depend  upon a variety of factors,  including
the  damages  sought in  Property Damage  Cases  that reach  trial prior  to the
completion of the Coverage Action, U.S. Gypsum's ability to successfully  defend
or  settle such cases, and  the resolution of the  Coverage Action. As a result,
management is unable  to determine whether  an adverse outcome  in the  asbestos
litigation  will have a material adverse effect  on the results of operations or
the consolidated financial position of the Corporation.

    The Corporation and certain of its subsidiaries have been notified by  state
and  federal environmental protection agencies of possible involvement as one of
numerous "potentially responsible parties" in a number of so-called  "Superfund"
sites  in the United  States. The Corporation does  not presently anticipate any
material adverse effect  upon its  earnings or  consolidated financial  position
arising out of the resolution of these matters or any other pending governmental
proceeding regarding environmental matters.

    (13)     USG  Corporation,   a  holding  company,   owns  several  operating
subsidiaries, including U.S. Gypsum. On January  1, 1985, all of the issued  and
outstanding  shares of stock  of U.S. Gypsum  were converted into  shares of USG
Corporation  and  the  holding  company  became  a  joint  and  several  obligor

                                      F-53
<PAGE>
                                USG CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                  (UNAUDITED)
for certain debentures originally issued by U.S. Gypsum. Debentures totaling $38
million  and $41 million  were on the  holding company's books  of account as of
September 30,  1993  and  December 31,  1992,  respectively.  Summary  financial
results for U.S. Gypsum are presented below (in millions of dollars):

<TABLE>
<CAPTION>
                                                        1993 (A)               1993                    1992
                                               --------------------------   -----------   -------------------------------
                                                THREE MONTHS      MAY 7      JANUARY 1     THREE MONTHS     NINE MONTHS
                                                   ENDED         THROUGH      THROUGH         ENDED            ENDED
SUMMARY STATEMENT OF EARNINGS                   SEPTEMBER 30     JUNE 30       MAY 6       SEPTEMBER 30     SEPTEMBER 30
- ---------------------------------------------  --------------   ---------   -----------   --------------   --------------
<S>                                            <C>              <C>         <C>           <C>              <C>
Net sales....................................  $         260    $    160    $      297    $         231    $         657
Cost and expenses............................            223         141           268              205              599
Amortization of excess reorganization                     15          10            --               --               --
 value.......................................
                                                       -----    ---------        -----            -----            -----
Operating profit.............................             22           9            29               26               58
Interest expense, net........................             --          --            --               --                1
Other income, net............................             (1)         --            --               (2)              (2)
Corporate charges............................             24          13            52               51              150
Reorganization items.........................             --          --          (295)              --               --
                                                       -----    ---------        -----            -----            -----
Earnings/(loss) before taxes on income and                (1)         (4)          272              (23)             (91)
 change in accounting principle..............
Income tax/(tax benefit).....................              2           3            (7)              (8)             (32)
                                                       -----    ---------        -----            -----            -----
Earnings/(loss) before change in accounting    $          (3)   $     (7)   $      279    $         (15)   $         (59)
 principle...................................
Cumulative effect of change in accounting                 --          --            28               --               --
 principle...................................
                                                       -----    ---------        -----            -----            -----
Net earnings/(loss)..........................             (3)         (7)          307              (15)             (59)
                                                       -----    ---------        -----            -----            -----
                                                       -----    ---------        -----            -----            -----
</TABLE>

<TABLE>
<CAPTION>
                                                               AS OF           AS OF
                                                           SEPTEMBER 30,   DECEMBER 31,
SUMMARY BALANCE SHEET                                        1993 (A)          1992
- ---------------------------------------------------------  -------------  ---------------
<S>                                                        <C>            <C>
Current assets...........................................    $     275       $     192
Property, plant and equipment, net.......................          484             511
Excess reorganization value, net.........................          281              --
Other assets.............................................            5               7
                                                           -------------         -----
  Total assets...........................................        1,045             710
                                                           -------------         -----
                                                           -------------         -----
Current liabilities......................................          112              32
Other liabilities and obligations........................          151             193
Stockholder's equity.....................................          782             485
                                                           -------------         -----
  Total liabilities and stockholder's equity.............  $     1,045    $        710
                                                           -------------         -----
                                                           -------------         -----
</TABLE>

           (a)  Due  to  the  Restructuring and  implementation  of  fresh start
       reporting,  financial   statements  effective   May  7,   1993  for   the
       newly-restructured  company  are not  comparable to  financial statements
       prior  to  that  date  for   the  predecessor  company.  See  "Notes   to
       Consolidated  Financial Statements --  Note (3)" for  more information on
       the Restructuring and implementation of fresh start reporting.

                                      F-54
<PAGE>
                                USG CORPORATION

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                  (UNAUDITED)

    (14) The  Corporation  issued $340  million  aggregate principal  amount  of
10  1/4%  Senior Notes  in May  1993  and an  additional $138  million aggregate
principal amount  of  such  notes in  August  1993.  Each of  U.S.  Gypsum,  USG
Industries,   Inc.,  USG   Interiors,  Inc.   ("USG  INTERIORS"),   USG  Foreign
Investments, Ltd.,  L&W Supply  Corporation  ("L&W SUPPLY"),  Westbank  Planting
Company,  USG Interiors International, Inc.,  American Metals Corporation and La
Mirada Products Co., Inc. (together,  the "COMBINED GUARANTORS") guaranteed,  in
the  manner described below, the obligations of the Corporation under the Credit
Agreement and the 10 1/4 Senior  Notes. The Combined Guarantors are jointly  and
severally  liable under the guarantees. Holders of the debt issued in connection
with the Credit  Agreement (the  "BANK DEBT") have  the right  to (i)  determine
whether,  when and to what extent the guarantees will be enforced (provided that
each guarantee payment will be applied to the Bank Debt and 10 1/4% Senior Notes
pro rata  based  on the  respective  amounts owed  thereon)  and (ii)  amend  or
eliminate  the guarantees. The  guarantees will terminate when  the Bank Debt is
retired regardless  of whether  the  10 1/4%  Senior  Notes remain  unpaid.  The
liability  of each of the Combined Guarantors on its guarantee is limited to the
greater of  (i) 95%  of  the lowest  amount, calculated  as  of July  13,  1988,
sufficient   to  render  the  guarantor  insolvent,  leave  the  guarantor  with
unreasonably small capital  or leave the  guarantor unable to  pay its debts  as
they become due (each as defined under applicable law) and (ii) the same amount,
calculated  as of the date any demand  for payment under such guarantee is made,
in each case plus collection costs. The guarantees are senior obligations of the
applicable guarantor and rank pari passu with all unsubordinated obligations  of
the guarantor.

    There  are 43 Non-Guarantors  (the "COMBINED NON-GUARANTORS"), substantially
all of  which  are  subsidiaries  of  Guarantors.  The  Combined  Non-Guarantors
primarily  include  CGC  Inc.  ("CGC"),  the  Corporation's  76%-owned  Canadian
subsidiary, Gypsum Transportation Limited, USG Canadian Mining Ltd., the Mexican
subsidiaries and the  European and  Pacific subsidiaries of  USG Interiors.  The
long-term debt of the Combined Non-Guarantors of $25 million as of September 30,
1993 has restrictive covenants that restrict, among other things, the payment of
dividends.

    The following condensed consolidating information presents:

            (i)  Condensed  financial statements  as of  September 30,  1993 and
       December 31, 1992 and for the three months ended September 30, 1993,  the
       periods  of May 7 through June 30, 1993 and January 1 through May 6, 1993
       and the three months and nine months ended September 30, 1992 of (a)  the
       Corporation  on a parent company only  basis (the "PARENT COMPANY," which
       was the  only  entity  of  the Corporation  included  in  the  bankruptcy
       proceeding), (b) the Combined Guarantors, (c) the Combined Non-Guarantors
       and (d) the Corporation on a consolidated basis. Due to the Restructuring
       and  implementation of  fresh start  reporting, the  financial statements
       effective  May  7,  1993  for  the  newly-restructured  company  are  not
       comparable to financial statements prior to that date for the predecessor
       company.   Except  for  the  following  condensed  financial  statements,
       separate financial information with respect to the Combined Guarantors is
       not deemed material to investors and is omitted.

           (ii) The  Parent Company  and Combined  Guarantors shown  with  their
       investments in their subsidiaries accounted for on the equity method.

           (iii) Elimination entries necessary to consolidate the Parent Company
       and its subsidiaries.

                                      F-55
<PAGE>
                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                     THREE MONTHS ENDED SEPTEMBER 30, 1993

<TABLE>
<CAPTION>
                                                                                COMBINED
                                                  PARENT        COMBINED          NON-
                                                  COMPANY      GUARANTORS      GUARANTORS      ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  ---------------  ---------------
                                                                        (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>            <C>            <C>              <C>              <C>
Net Sales....................................    $      --      $     445       $      90        $     (21)       $     514
Gross Profit.................................           --             87              18               --              105
Operating Profit/(Loss)......................          (11)            17              --               --                6
Equity in net loss of the Subsidiaries.......           29              4              --              (33)              --
Interest expense, net........................           31              1              --               --               32
Corporate service charge.....................          (41)            41              --               --               --
Other (income)/expense, net..................           --             (6)              1                1               (4)
                                                       ---          -----             ---              ---            -----
Loss Before Taxes on Income..................          (30)           (23)             (1)              32              (22)
Taxes on income/(income tax benefit).........           (6)             6               3               --                3
                                                       ---          -----             ---              ---            -----
Net Loss.....................................    $     (24)     $     (29)      $      (4)       $      32        $     (25)
                                                       ---          -----             ---              ---            -----
                                                       ---          -----             ---              ---            -----
</TABLE>

                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                          MAY 7 THROUGH JUNE 30, 1993

<TABLE>
<CAPTION>
                                                                                COMBINED
                                                  PARENT        COMBINED          NON-
                                                  COMPANY      GUARANTORS      GUARANTORS      ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  ---------------  ---------------
                                                                        (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>            <C>            <C>              <C>              <C>
Net Sales....................................    $      --      $     279       $      57        $     (21)       $     315
Gross Profit.................................           --             51              12               --               63
Operating Profit/(Loss)......................           (6)             6              (1)              --               (1)
Equity in net loss of the Subsidiaries.......           23              3              --              (26)              --
Interest expense, net........................           20              1              --               --               21
Corporate service charge.....................          (27)            27              --               --               --
Other (income)/expense, net..................           (1)            (4)              1                2               (2)
                                                       ---          -----             ---              ---            -----
Loss Before Taxes on Income..................          (21)           (21)             (2)              24              (20)
Taxes on income/(income tax benefit).........           (2)             2               1               --                1
                                                       ---          -----             ---              ---            -----
Net Loss.....................................    $     (19)     $     (23)      $      (3)       $      24        $     (21)
                                                       ---          -----             ---              ---            -----
                                                       ---          -----             ---              ---            -----
</TABLE>

                                      F-56
<PAGE>
                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                         JANUARY 1 THROUGH MAY 6, 1993

<TABLE>
<CAPTION>
                                                                             COMBINED
                                                 PARENT       COMBINED         NON-
                                                 COMPANY     GUARANTORS     GUARANTORS    ELIMINATIONS   CONSOLIDATED
                                               -----------  -------------  -------------  -------------  -------------
                                                                    (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>          <C>            <C>            <C>            <C>
Net Sales....................................   $      --     $     501      $     113      $     (23)     $     591
Gross Profit.................................           1            84             24             --            109
Operating Profit/(Loss)......................         (11)           39             10             --             38
Equity in net earnings of the Subsidiaries...        (751)         (169)            --            920             --
Interest expense, net........................          80             3              1             --             84
Corporate service charge.....................         (92)           92             --             --             --
Other expense, net...........................           1             5             --             --              6
Reorganization items.........................          53          (597)          (165)            --           (709)
                                               -----------       ------         ------         ------    -------------
Earnings Before Taxes on Income and
 Extraordinary Items.........................         698           705            174           (920)           657
Taxes on income/(income tax benefit).........          37           (24)             4             --             17
                                               -----------       ------         ------         ------    -------------
Earnings Before Extraordinary Items..........         661           729            170           (920)           640
Extraordinary gain, net of taxes.............         944            --             --             --            944
Cumulative effect of changes in accounting
 principles..................................        (171)           22             (1)            --           (150)
                                               -----------       ------         ------         ------    -------------
Net Earnings.................................   $   1,434     $     751      $     169      $    (920)     $   1,434
                                               -----------       ------         ------         ------    -------------
                                               -----------       ------         ------         ------    -------------
</TABLE>

                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                     THREE MONTHS ENDED SEPTEMBER 30, 1992

<TABLE>
<CAPTION>
                                                                                COMBINED
                                                  PARENT        COMBINED          NON-
                                                  COMPANY      GUARANTORS      GUARANTORS      ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  ---------------  ---------------
                                                                        (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>            <C>            <C>              <C>              <C>
Net Sales....................................    $      --      $     415       $      97        $     (38)       $     474
Gross Profit.................................           --             75              19               --               94
Operating Profit/(Loss)......................           (7)            39               7               --               39
Equity in net (earnings)/loss of the
 Subsidiaries................................           33             (4)             --              (29)              --
Interest expense, net........................           75              3              --               --               78
Corporate service charge.....................          (90)            90              --               --               --
Other (income)/expense, net..................            2             (2)              1               --                1
                                                       ---          -----             ---              ---            -----
Earnings/(Loss) Before Taxes on Income.......          (27)           (48)              6               29              (40)
Taxes on income/(income tax benefit).........            6            (15)              2               --               (7)
                                                       ---          -----             ---              ---            -----
Net Earnings/(Loss)..........................    $     (33)     $     (33)      $       4        $      29        $     (33)
                                                       ---          -----             ---              ---            -----
                                                       ---          -----             ---              ---            -----
</TABLE>

                                      F-57
<PAGE>
                                USG CORPORATION
                 CONDENSED CONSOLIDATING STATEMENT OF EARNINGS
                      NINE MONTHS ENDED SEPTEMBER 30, 1992

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS   CONSOLIDATED
                                               -----------  -----------  -------------  -------------  -------------
                                                                   (DOLLAR AMOUNTS IN MILLIONS)
<S>                                            <C>          <C>          <C>            <C>            <C>
Net Sales....................................   $      --    $   1,146     $     275      $     (80)     $   1,341
Gross Profit.................................          --          193            53             --            246
Operating Profit/(Loss)......................         (21)          88            20             --             87
Equity in net (earnings)/loss of the
 Subsidiaries................................         118          (13)           --           (105)            --
Interest expense, net........................         235            8             2             --            245
Corporate service charge.....................        (270)         270            --             --             --
Other (income)/expense, net..................           5           (4)           (1)            --             --
                                               -----------  -----------        -----         ------    -------------
Earnings/(Loss) Before Taxes on Income.......        (109)        (173)           19            105           (158)
Taxes on income/(income tax benefit).........          22          (55)            6             --            (27)
                                               -----------  -----------        -----         ------    -------------
Net Earnings/(Loss)..........................   $    (131)   $    (118)    $      13      $     105      $    (131)
                                               -----------  -----------        -----         ------    -------------
                                               -----------  -----------        -----         ------    -------------
</TABLE>

                                      F-58
<PAGE>
                                USG CORPORATION
                     CONDENSED CONSOLIDATING BALANCE SHEET
                            AS OF SEPTEMBER 30, 1993
                          (DOLLAR AMOUNTS IN MILLIONS)
                                     ASSETS

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS  CONSOLIDATED
                                               -----------  -----------  -------------  ------------  -------------
<S>                                            <C>          <C>          <C>            <C>           <C>
Current Assets:
  Cash and cash equivalents..................   $     129    $      (7)    $      35     $       --     $     157
  Receivables, net...........................          10          261            51            (30)          292
  Inventories................................          --          112            37             (2)          147
                                               -----------  -----------        -----    ------------  -------------
      Total current assets...................         139          366           123            (32)          596
Property, Plant and Equipment, Net...........          21          623           110             --           754
Investment in Subsidiaries...................       1,762          293            --         (2,055)           --
Excess Reorganization Value, Net.............          --          615           161             --           776
Other Assets.................................        (199)         260             5             (6)           60
                                               -----------  -----------        -----    ------------  -------------
      Total assets...........................   $   1,723    $   2,157     $     399     $   (2,093)    $   2,186
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable and accrued expenses......         110          195            49            (28)          326
  Notes payable and LTD maturing within one
   year......................................          --            1            13             --            14
                                               -----------  -----------        -----    ------------  -------------
      Total current liabilities..............         110          196            62            (28)          340
Long-Term Debt...............................       1,376           38            25             --         1,439
Deferred Income Taxes........................           5          153            15             --           173
Other Liabilities............................         274            8             4             --           286
Stockholders' Equity/(Deficit):
  Common stock...............................           4            1             6             (7)            4
  Capital received in excess of par value....          --        1,678           306         (1,984)           --
  Deferred currency translation..............          --           (1)           (9)            --           (10)
  Reinvested earnings/(deficit)..............         (46)          84           (10)           (74)          (46)
                                               -----------  -----------        -----    ------------  -------------
      Total stockholders' equity/
       (deficit).............................         (42)       1,762           293         (2,065)          (52)
                                               -----------  -----------        -----    ------------  -------------
Total liabilities and stockholders' equity...   $   1,723    $   2,157     $     399     $   (2,093)    $   2,186
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
</TABLE>

                                      F-59
<PAGE>
                                USG CORPORATION
                     CONDENSED CONSOLIDATING BALANCE SHEET
                            AS OF DECEMBER 31, 1992
                          (DOLLAR AMOUNTS IN MILLIONS)
                                     ASSETS

<TABLE>
<CAPTION>
                                                                           COMBINED
                                                 PARENT      COMBINED        NON-
                                                 COMPANY    GUARANTORS    GUARANTORS    ELIMINATIONS  CONSOLIDATED
                                               -----------  -----------  -------------  ------------  -------------
<S>                                            <C>          <C>          <C>            <C>           <C>
Current Assets:
  Cash and cash equivalents..................   $      59    $      87     $      34     $       --     $     180
  Receivables (net of reserves)..............          65          219            40            (25)          299
  Inventories................................          --           82            34             (3)          113
  Restricted cash............................          --           88            --             --            88
                                               -----------  -----------        -----    ------------  -------------
      Total current assets...................         124          476           108            (28)          680
Property, Plant and Equipment, Net...........          19          664           117             --           800
Investment in Subsidiaries...................       1,073          133            --         (1,206)           --
Purchased Goodwill, Net......................          --           61             8             --            69
Other Assets.................................         (89)         214           (11)            (4)          110
                                               -----------  -----------        -----    ------------  -------------
      Total assets...........................   $   1,127    $   1,548     $     222     $   (1,238)    $   1,659
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
                                       LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts payable and accrued expenses......         538           91            39            (24)          644
  Notes payable and LTD maturing within one
   year......................................         570          141             7             --           718
  Long-term debt classified as current.......       1,926           --            --             --         1,926
                                               -----------  -----------        -----    ------------  -------------
      Total current liabilities..............       3,034          232            46            (24)        3,288
Long-Term Debt...............................           1           38            28             --            67
Deferred Income Taxes........................         (36)         196            15             --           175
Other Liabilities............................          --            9            --             --             9
Stockholders' Equity/(Deficit):
  Common stock...............................           5            2             5             (7)            5
  Capital received in excess of par value....          23        1,002            34         (1,036)           23
  Deferred currency translation..............          --           (2)           (6)            --            (8)
  Reinvested earnings/(deficit)..............      (1,900)          71           100           (171)       (1,900)
                                               -----------  -----------        -----    ------------  -------------
      Total stockholders' equity/
       (deficit).............................      (1,872)       1,073           133         (1,214)       (1,880)
                                               -----------  -----------        -----    ------------  -------------
Total liabilities and stockholders' equity...   $   1,127    $   1,548     $     222     $   (1,238)    $   1,659
                                               -----------  -----------        -----    ------------  -------------
                                               -----------  -----------        -----    ------------  -------------
</TABLE>

                                      F-60
<PAGE>
                                USG CORPORATION
                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                        MAY 7 THROUGH SEPTEMBER 30, 1993
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                                             COMBINED
                                                 PARENT       COMBINED         NON-
                                                 COMPANY     GUARANTORS     GUARANTORS     ELIMINATIONS     CONSOLIDATED
                                               -----------  -------------  -------------  ---------------  ---------------
<S>                                            <C>          <C>            <C>            <C>              <C>
NET CASH FLOWS FROM OPERATING ACTIVITIES.....   $       9     $     109      $       8       $      --        $     126
  Capital expenditures.......................          --           (12)            (4)             --              (16)
  Net proceeds from asset dispositions.......          --             9             --              --                9
                                                    -----        ------            ---           -----            -----
NET CASH FLOWS TO INVESTING ACTIVITIES.......          --            (3)            (4)             --               (7)
  Issuance of debt...........................          --            --             26              --               26
  Repayment of debt..........................          (4)           (9)           (24)             --              (37)
  Cash dividends (paid)/ received............          --             3             (3)             --               --
  Net cash transfers (to)/from Corporate.....         100          (100)            --              --               --
                                                    -----        ------            ---           -----            -----
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................          96          (106)            (1)             --              (11)
NET INCREASE IN CASH AND CASH EQUIVALENTS....         105            --              3              --              108
                                                    -----        ------            ---           -----            -----
Cash and cash equivalents at beginning of
 period......................................          24            (7)            32              --               49
                                                    -----        ------            ---           -----            -----
Cash and cash equivalents at end of period...   $     129     $      (7)     $      35       $      --        $     157
                                                    -----        ------            ---           -----            -----
                                                    -----        ------            ---           -----            -----
</TABLE>

                                      F-61
<PAGE>
                                USG CORPORATION
                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                         JANUARY 1 THROUGH MAY 6, 1993
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                                                COMBINED
                                                  PARENT        COMBINED          NON-
                                                  COMPANY      GUARANTORS      GUARANTORS      ELIMINATIONS     CONSOLIDATED
                                               -------------  -------------  ---------------  ---------------  ---------------
<S>                                            <C>            <C>            <C>              <C>              <C>
NET CASH FLOWS (TO)/FROM OPERATING
 ACTIVITIES..................................    $     (90)     $      76       $      --        $      --        $     (14)
  Capital expenditures.......................           --             (9)             (3)              --              (12)
  Net proceeds from asset dispositions.......           --             --              --               --               --
                                                       ---         ------             ---            -----           ------
NET CASH FLOWS TO INVESTING ACTIVITIES.......           --             (9)             (3)              --              (12)
  Issuance of debt...........................           --             --               5               --                5
  Repayment of debt..........................           --           (140)             (2)              --             (142)
  Cash dividends (paid)/received.............            2             --              (2)              --               --
  (Increase)/decrease in restricted assets...           44            (12)             --               --               32
  Net cash transfers (to)/from Corporate.....            9             (9)             --               --               --
                                                       ---         ------             ---            -----           ------
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................           55           (161)              1               --             (105)
NET DECREASE IN CASH AND CASH EQUIVALENTS....          (35)           (94)             (2)              --             (131)
                                                       ---         ------             ---            -----           ------
Cash and cash equivalents at beginning of
 period......................................           59             87              34               --              180
                                                       ---         ------             ---            -----           ------
Cash and cash equivalents at end of period       $      24      $      (7)      $      32        $      --        $      49
                                                       ---         ------             ---            -----           ------
                                                       ---         ------             ---            -----           ------
</TABLE>

                                      F-62
<PAGE>
                                USG CORPORATION
                CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
                      NINE MONTHS ENDED SEPTEMBER 30, 1992
                          (DOLLAR AMOUNTS IN MILLIONS)

<TABLE>
<CAPTION>
                                                                             COMBINED
                                                 PARENT       COMBINED         NON-
                                                 COMPANY     GUARANTORS     GUARANTORS     ELIMINATIONS     CONSOLIDATED
                                               -----------  -------------  -------------  ---------------  ---------------
<S>                                            <C>          <C>            <C>            <C>              <C>
NET CASH FLOWS (TO)/FROM OPERATING
 ACTIVITIES..................................   $    (133)    $     138      $      38       $      --        $      43
  Capital expenditures.......................          (1)          (21)            (5)             --              (27)
  Net proceeds from asset dispositions.......          --             2              4              --                6
                                               -----------       ------            ---           -----            -----
NET CASH FLOWS TO INVESTING ACTIVITIES.......          (1)          (19)            (1)             --              (21)
  Issuance of debt...........................          --            --             57              --               57
  Repayment of debt..........................          --            (3)           (65)             --              (68)
  Cash dividends (paid)/received.............          --            27            (27)             --               --
  Increase in restricted assets..............          --            (3)            --              --               (3)
  Net cash transfers (to)/from Corporate.....         147          (147)            --              --               --
                                               -----------       ------            ---           -----            -----
NET CASH FLOWS (TO)/FROM FINANCING
 ACTIVITIES..................................         147          (126)           (35)             --              (14)
NET INCREASE/(DECREASE) IN CASH AND CASH
 EQUIVALENTS.................................          13            (7)             2              --                8
                                               -----------       ------            ---           -----            -----
Cash and cash equivalents at beginning of
 period......................................          36            78             41              --              155
                                               -----------       ------            ---           -----            -----
Cash and cash equivalents at end of period...   $      49     $      71      $      43       $      --        $     163
                                               -----------       ------            ---           -----            -----
                                               -----------       ------            ---           -----            -----
</TABLE>

                                      F-63
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of
  USG Corporation:

We  have reviewed the  accompanying condensed consolidated  balance sheet of USG
CORPORATION (a Delaware corporation) AND SUBSIDIARIES as of September 30,  1993,
the  related condensed consolidated statements of earnings for the period of May
7 through June 30, 1993  and the three months ended  September 30, 1993 and  the
condensed  consolidated statement of cash flows for  the period of May 7 through
September 30, 1993.  These financial  statements are the  responsibility of  the
Company's management.

We  conducted  our  reviews  in accordance  with  standards  established  by the
American  Institute  of  Certified  Public  Accountants.  A  review  of  interim
financial  information consists principally of applying analytical procedures to
financial data and  making inquiries  of persons responsible  for financial  and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing standards, the objective of which is
the  expression  of an  opinion regarding  the financial  statements taken  as a
whole. Accordingly, we do not express such an opinion.

As  discussed  in  Note  3,  on  May  6,  1993,  the  Corporation  completed   a
comprehensive   financial   restructuring  through   the  implementation   of  a
prepackaged plan of reorganization  under Chapter 11 of  Title 11 of the  United
States  Bankruptcy Code and  applied fresh start reporting.  As such, results of
operations through May  6, 1993  (predecessor company) are  not comparable  with
results of operations subsequent to that date.

As  discussed in  Note 12,  in view of  the limited  insurance funding currently
available for property damage cases resulting from the continued resistance by a
number of  U.S. Gypsum's  insurers  to providing  coverage,  the effect  of  the
asbestos  litigation on the  Corporation will depend upon  a variety of factors,
including the damages sought in property damage cases that reach trial prior  to
the  completion of  the coverage action,  U.S. Gypsum's  ability to successfully
defend or settle such  cases, and the  resolution of the  coverage action. As  a
result,  management is  unable to  determine whether  an adverse  outcome in the
asbestos litigation  will have  a material  adverse effect  on the  consolidated
results of operations or the consolidated financial position of the Corporation.

Based on our reviews, we are not aware of any material modifications that should
be  made  to  the financial  statements  referred to  above  for them  to  be in
conformity with generally accepted accounting principles.

                                          /s/ Arthur Andersen & Co.
                                          ARTHUR ANDERSEN & CO.

Chicago, Illinois
October 22, 1993

                                      F-64
<PAGE>
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of
  USG Corporation:

We have reviewed the accompanying condensed consolidated statements of  earnings
of  USG CORPORATION (a Delaware corporation)  AND SUBSIDIARIES for the period of
January 1 through May  6, 1993 and  for the three month  and nine month  periods
ended September 30, 1992 and the condensed consolidated statements of cash flows
for  the period of January 1  through May 6, 1993 and  for the nine month period
ended September 30, 1992.

We conducted  our  reviews  in  accordance with  standards  established  by  the
American  Institute  of  Certified  Public  Accountants.  A  review  of  interim
financial information consists principally of applying analytical procedures  to
financial  data and  making inquiries of  persons responsible  for financial and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing standards, the objective of which is
the expression  of an  opinion regarding  the financial  statements taken  as  a
whole. Accordingly, we do not express such an opinion.

As   discussed  in  Note  3,  on  May  6,  1993,  the  Corporation  completed  a
comprehensive  financial   restructuring  through   the  implementation   of   a
prepackaged  plan of reorganization under  Chapter 11 of Title  11 of the United
States Bankruptcy Code and  applied fresh start reporting.  As such, results  of
operations  through May  6, 1993 (predecessor  company) are  not comparable with
results of operations subsequent to that date.

As discussed in  Note 12,  in view of  the limited  insurance funding  currently
available for property damage cases resulting from the continued resistance by a
number  of  U.S. Gypsum's  insurers  to providing  coverage,  the effect  of the
asbestos litigation on the  Corporation will depend upon  a variety of  factors,
including  the damages sought in property damage cases that reach trial prior to
the completion of  the coverage  action, U.S. Gypsum's  ability to  successfully
defend  or settle such  cases, and the  resolution of the  coverage action. As a
result, management is  unable to  determine whether  an adverse  outcome in  the
asbestos  litigation will  have a  material adverse  effect on  the consolidated
results of operations or the consolidated financial position of the Corporation.

Based on our reviews, we are not aware of any material modifications that should
be made  to  the financial  statements  referred to  above  for them  to  be  in
conformity with generally accepted accounting principles.

                                          /s/ Arthur Andersen & Co.
                                          ARTHUR ANDERSEN & CO.

Chicago, Illinois
October 22, 1993

                                      F-65
<PAGE>
    NO  DEALER, SALESPERSON OR ANY OTHER PERSON  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO  MAKE ANY  REPRESENTATIONS OTHER  THAN THOSE  CONTAINED IN  OR
INCORPORATED  BY REFERENCE IN THIS PROSPECTUS  IN CONNECTION WITH THE OFFER MADE
BY THIS PROSPECTUS AND,  IF GIVEN OR MADE,  SUCH INFORMATION OR  REPRESENTATIONS
MUST  NOT BE RELIED UPON AS HAVING BEEN  AUTHORIZED BY THE CORPORATION OR BY ANY
OF THE UNDERWRITERS. NEITHER THE DELIVERY  OF THIS PROSPECTUS NOR ANY SALE  MADE
HEREUNDER  SHALL UNDER ANY CIRCUMSTANCES, CREATE  ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN  THE AFFAIRS OF  THE CORPORATION SINCE THE  DATES AS OF  WHICH
INFORMATION  IS GIVEN IN THIS PROSPECTUS. THIS PROSPECTUS DOES NOT CONSTITUTE AN
OFFER OR  SOLICITATION BY  ANYONE IN  ANY JURISDICTION  IN WHICH  SUCH OFFER  OR
SOLICITATION  IS NOT  AUTHORIZED OR  IN WHICH  THE PERSON  MAKING SUCH  OFFER OR
SOLICITATION IS NOT QUALIFIED TO DO SO OR  TO ANY PERSON TO WHOM IT IS  UNLAWFUL
TO MAKE SUCH SOLICITATION.

                            ------------------------

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Prospectus Summary.............................           3
Summary Financial Information..................           7
Risk Factors...................................           9
The Restructuring..............................          12
Purpose of the Offering and Use of Proceeds....          13
Capitalization.................................          14
Price Range of Common Stock....................          15
Dividend Policy................................          15
Dilution.......................................          16
Pro Forma Condensed Consolidated Financial
 Statements....................................          16
Selected Consolidated Financial Data...........          26
Management's Discussion and Analysis of
 Financial Condition and Results of
 Operations....................................          28
Business.......................................          38
Management.....................................          52
Ownership of Common Stock......................          64
Certain Relationships and Related
 Transactions..................................          65
Description of Credit Agreement................          68
Description of Other Debt Obligations..........          79
Description of Collateral Trust................          91
Description of Capital Stock...................          93
Underwriting...................................          97
Legal Matters..................................          99
Experts........................................          99
Additional Information.........................          99
Index to Financial Statements..................         101
</TABLE>

8,500,000 SHARES
USG CORPORATION

COMMON STOCK
($.10 PAR VALUE)

[LOGO]

SALOMON BROTHERS INC
LAZARD FRERES & CO.
SMITH BARNEY SHEARSON INC.

PROSPECTUS
DATED           , 1994
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following are the estimated expenses of the issuance and distribution of
the  Common  Stock  being  registered, including  fees  and  expenses previously
incurred by the Corporation, other than any underwriting compensation.

<TABLE>
<CAPTION>
                                                                                AMOUNT
                                 ITEM                                   (DOLLARS IN THOUSANDS)
- ----------------------------------------------------------------------  -----------------------
<S>                                                                     <C>
Securities and Exchange Commission Registration Fees..................         $     100
Stock Exchange Filing Fees............................................                30
NASD Filing Fee.......................................................                30
Blue Sky Fees and Expenses (including attorneys' fees and expenses)...                30
Printing and Engraving Expenses.......................................               100
Transfer Agent's Fees and Expenses....................................                10
Accounting Fees and Expenses..........................................                60
Legal Fees and Expenses...............................................               300
Miscellaneous Expenses................................................               150
                                                                                   -----
    Total.............................................................         $     810
                                                                                   -----
                                                                                   -----
</TABLE>

ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
    Section 145  of the  Delaware General  Corporation Law  ("SECTION 145")  (a)
gives  Delaware corporations broad powers to  indemnify their present and former
directors and officers  and those  of affiliated  corporations against  expenses
incurred  in the defense of any lawsuit to which they are made parties by reason
of being  or  having been  such  directors  or officers,  subject  to  specified
conditions  and exclusions,  (b) gives  a director  or officer  who successfully
defends an  action  the  right to  be  so  indemnified and  (c)  authorizes  the
corporation   to  buy   directors'  and  officers'   liability  insurance.  Such
indemnification is not exclusive of any  other right to which those  indemnified
may be entitled under any bylaw, agreement, vote of stockholders or otherwise.

    A  bylaw provides that the Corporation  (a) shall indemnify every person who
is or was a director or officer of  the Corporation or is or was serving at  the
Corporation's   request  as  a  director  or  officer  of  another  corporation,
partnership, joint venture,  trust or  other enterprise  and (b)  shall, if  the
board of directors so directs, indemnify any person who is or was an employee or
agent of the Corporation or is or was serving at the Corporation's request as an
employee  or agent of another corporation,  partnership, joint venture, trust or
other enterprise, to the extent, in  the manner, and subject to compliance  with
the applicable standards of conduct, provided by Section 145 as the same (or any
substitute provision therefor) may be in effect from time to time.

    Any  such indemnification shall continue as to a person who has ceased to be
a director, officer, employee  or agent and  shall inure to  the benefit of  the
heirs, executors and administrators of such a person.

    The  Corporation  has procured  insurance for  the purpose  of substantially
covering its future potential liability for indemnification under Section 145 as
discussed above and certain future potential liability of individual officers or
directors  incurred  in  their  capacity  as  such  which  is  not  subject   to
indemnification.

    The Corporation has entered into Indemnification Agreements with each of its
officers   and  directors.  The  Indemnification  Agreements  provide  that  the
Corporation shall indemnify and keep  indemnified the indemnitee to the  fullest
extent  authorized by Section 145 as it may  be in effect from time to time from
and against any  expenses (including expenses  of investigation and  preparation
and  reasonable fees and  disbursements of legal  counsel, accountants and other
experts), judgments, fines and amounts paid  in settlement by the indemnitee  in
connection    with    any    threatened,    pending    or    completed   action,

                                      II-1
<PAGE>
suit or proceeding,  whether civil, criminal,  administrative or  investigative,
and  whether or not the  cause of action, suit  or proceeding incurred before or
after the date of the Indemnification Agreement. The Indemnification  Agreements
further  provide for  advancement of amounts  to cover expenses  incurred by the
indemnitee in  defending any  such  action, suit  or  proceeding subject  to  an
undertaking  by the indemnitee to repay any  expenses advanced which it is later
determined he or she was not entitled to receive.

ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES

    During the past three years, the  Corporation has not sold any  unregistered
securities.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

    (a)  The following is  a complete list of  Exhibits filed as  a part of this
Registration Statement:

        See Exhibit Index

    (b) The following is a complete list of financial statement Schedules  filed
as  a  part  of this  Registration  Statement  and included  with  the financial
statements filed as a part of this Registration Statement:

<TABLE>
<S>        <C>           <C>        <C>
1.         Schedule V    --         Property, Plant and Equipment
2.         Schedule VI   --         Accumulation Depreciation and Depletion of Property, Plant and
                                    Equipment
3.         Schedule      --         Valuation and Qualifying Accounts
           VIII
4.         Schedule IX   --         Short-Term Borrowings
5.         Schedule X    --         Supplemental Statement of Earnings Information
</TABLE>

    All other  schedules are  omitted because  they are  not applicable  or  the
required information is shown in the financial statements or notes thereto.

ITEM 17.  UNDERTAKINGS

    The Registrant hereby undertakes:

    (1)  To  provide  to  the  Underwriters  at  the  closing  specified  in the
underwriting agreement certificates in such denominations and registered in such
names as  required  by  the  Underwriters to  permit  prompt  delivery  to  each
purchaser.

    (2) For purposes of determining any liability under the Act, the information
omitted from the form of prospectus filed as part of this registration statement
in  reliance upon Rule 430A  and contained in a form  of prospectus filed by the
registrant pursuant to Rule 424(b)(1)  or (4) or 497(h)  under the Act shall  be
deemed  to be part of this registration statement as of the time it was declared
effective.

    (3) That, for the purpose of determining any liability under the  Securities
Act  of 1933,  each such post-effective  amendment shall  be deemed to  be a new
registration statement,  relating to  the securities  offered therein,  and  the
offering  of such securities at that time shall be deemed to be the initial bona
fide offering thereof; and

    (4) To remove from registration by  means of a post-effective amendment  any
of the securities being registered which remain unsold at the termination of the
offering.

    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to  directors, officers and controlling persons of  the
Registrants  pursuant to provisions described  in this Registration Statement or
otherwise, the  Registrants  have  been  advised that  in  the  opinion  of  the
Securities and Exchange Commission such indemnification is against public policy
as  expressed in the Act  and is, therefore, unenforceable.  In the event that a
claim for indemnification against  such liabilities (other  than the payment  by
the  Registrants  of  expenses  incurred  or  paid  by  a  director,  officer or
controlling person of the Registrants in  the successful defense of any  action,
suit  or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrants will, unless
in the  opinion of  their respective  counsel  the matter  has been  settled  by
controlling  precedent,  submit  to  a  court  of  appropriate  jurisdiction the
question of  whether such  indemnification by  it is  against public  policy  as
expressed  in the  Act and will  be governed  by the final  adjudication of such
issue.

                                      II-2
<PAGE>
                                   SIGNATURES

    Pursuant  to the requirements of the  Securities Act of 1933, the Registrant
has duly caused this Registration  Statement to be signed  on its behalf by  the
undersigned,  thereunto  duly  authorized,  in the  City  of  Chicago,  State of
Illinois on January   1994.

                                          USG CORPORATION

                                          By:         /s/ John E. Malone
                                          --------------------------------------
                                                       John E. Malone
                                                VICE PRESIDENT AND TREASURER

    Pursuant  to  the  requirements  of   the  Securities  Act  of  1933,   this
Registration Statement and power of attorney have been signed on January   1994,
by the following persons in the capacities indicated:

<TABLE>
<CAPTION>
                   SIGNATURE                                                TITLE
- ------------------------------------------------  ---------------------------------------------------------
<C>                                               <S>
                                *
     --------------------------------------       Chairman of the Board, Chief Executive Officer, and
               Eugene B. Connolly                  Director (Principal Executive Officer)
                                *
     --------------------------------------       Vice Chairman and Director
             Anthony J. Falvo, Jr.
                 /s/ Richard H. Fleming
     --------------------------------------       Vice President and Chief Financial Officer (Principal
               Richard H. Fleming                  Financial Officer)
                   /s/ Raymond T. Belz
     --------------------------------------       Vice President and Controller
                Raymond T. Belz                    (Principal Accounting Officer)
                                *
     --------------------------------------       Director
               Robert L. Barnett
                                *
     --------------------------------------       Director
                 Keith A. Brown
                                *
     --------------------------------------       Director
                   W.H. Clark
                                *
     --------------------------------------       Director
                James C. Cotting
                                *
     --------------------------------------       Director
              Lawrence M. Crutcher
</TABLE>

                                      II-3
<PAGE>

<TABLE>
<CAPTION>
                   SIGNATURE                                                TITLE
- ------------------------------------------------  ---------------------------------------------------------
<C>                                               <S>
                                *
     --------------------------------------       Director
                Wade Fetzer III
                                *
     --------------------------------------       Director
                  David W. Fox
     --------------------------------------       Director
             Philip C. Jackson, Jr.
                                *
     --------------------------------------       Director
                Marvin E. Lesser
                                *
     --------------------------------------       Director
                John B. Schwemm
                                *
     --------------------------------------       Director
                 Alan G. Turner
                                *
     --------------------------------------       Director
                Barry L. Zubrow
</TABLE>

*By:                              /s/ John E. Malone

                       ---------------------------------
                                 John E. Malone
                                Attorney-in-fact

                                      II-4
<PAGE>
                                 EXHIBIT INDEX

    The  following documents are the exhibits  to this Registration Statement on
Form S-1. For  convenient reference,  each exhibit  is listed  according to  the
Exhibit  Table of Regulation  S-K. The page  number, if any,  listed opposite an
exhibit indicates the  page number  in the  sequential numbering  system in  the
manually  signed original of this Registration  Statement on Form S-1 where such
exhibit can  be  found.  Exhibits  followed  by  an  (*)  constitute  management
contracts  or compensatory plans  or arrangements. Exhibits  followed by an (**)
will be filed by amendment.

<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                                                                            PAGE
- ---------                                                                                                       ---------
<C>        <S>        <C>                                                                                       <C>
       1.  Form of Underwriting Agreement                                                                          **
       3.  Articles of incorporation and by-laws:
           (a)        Restated Certificate of Incorporation of  USG Corporation (incorporated by reference  to
                      Exhibit 3.1 of USG Corporation's Form 8-K, dated May 7, 1993.)
           (b)        Amended  and Restated By-Laws of USG Corporation, dated as of May 12, 1993 (incorporated
                      by reference  to Exhibit  3(b) of  Amendment  No. 1  to USG  Corporation's  Registration
                      Statement No. 33-61162 on Form S-1, dated June 16, 1993).
       4.  Instruments defining the rights of security holders, including indentures:
           (a)        Indenture  dated as  of October  1, 1986  between USG  Corporation and  Harris Trust and
                      Savings Bank, Trustee (incorporated  by reference to Exhibit  4(a) of USG  Corporation's
                      Registration Statement No. 33-9294 on Form S-3, dated October 7, 1986).
           (b)        Resolutions  dated December  16, 1986  of a  Special Committee  created by  the Board of
                      Directors  of  USG  Corporation  (incorporated  by   reference  to  Exhibit  1  of   USG
                      Corporation's Current Report on Form 8-K, dated December 16, 1986).
           (c)        Resolutions dated March 5, 1987 of a Special Committee created by the Board of Directors
                      of  USG Corporation (incorporated by reference to Exhibit 1 of USG Corporation's Current
                      Report on Form 8-K, dated March 9, 1987).
           (d)        Resolutions dated March 6, 1987 of a Special Committee created by the Board of Directors
                      of USG Corporation (incorporated by reference to Exhibit 3 of USG Corporation's  Current
                      Report on Form 8-K, dated March 9, 1987).
           (e)        Resolutions  dated  April  26, 1993  of  a Special  Committee  created by  the  Board of
                      Directors of USG Corporation relating to USG Corporation's 8% Senior Notes due 1995  and
                      9%  Senior Notes due 1998 (incorporated by reference to Exhibit 4.1 of USG Corporation's
                      Form 8-K, dated May 7, 1993).
           (f)        Form of  Resolutions to  be adopted  by  a Special  Committee created  by the  Board  of
                      Directors of USG Corporation relating to USG Corporation's 9 1/4% Senior Notes due 2001.     **
           (g)        Form  of note purchase agreement to be  entered into between USG Corporation and certain
                      institutional investors relating to USG Corporation's 9 1/4% Senior Notes due 2001.          **
           (h)        Indenture dated as of April 26, 1993 among USG Corporation, certain guarantors and State
                      Street Bank and Trust Company, as Trustees, relating to USG Corporation's 10 1/4% Senior
                      Notes due 2002 (incorporated by reference to Exhibit 4.2 of USG Corporation's Form  8-K,
                      dated May 7, 1993).
           (i)        Indenture  dated as  of August  10, 1993 among  USG Corporation,  certain guarantors and
                      State Street Bank and Trust Company, as  Trustee, relating to USG Corporation's 10  1/4%
                      Senior  Notes  due 2002,  Series B  (incorporated by  reference to  Exhibit 4(f)  of USG
                      Corporation's Quarterly Report on Form  10-Q for the quarter  ended June 30, 1993  dated
                      August 12, 1993.
           (j)        Warrant Agreement dated May 6, 1993 between USG Corporation and Harris Trust and Savings
                      Bank,  as  Warrant  Agent,  relating  to  USG  Corporation's  Warrants  (incorporated by
                      reference to Exhibit 4.3 of USG Corporation's Form 8-K, dated May 7, 1993).
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                                                                            PAGE
- ---------                                                                                                       ---------
<C>        <S>        <C>                                                                                       <C>
           (k)        Form of Warrant Certificate (incorporated by reference to Exhibit 4(g) of Amendment  No.
                      4  to USG Corporation's Registration Statement No.  33-40136 on Form S-4, dated November
                      12, 1992).
           (l)        Rights Agreement dated May 6, 1993 between USG Corporation and Harris Trust and  Savings
                      Bank,  as Rights Agent (incorporated  by reference to Exhibit  10.1 of USG Corporation's
                      Form 8-K, dated May 7, 1993).
           (m)        Form of  Common Stock  certificate (incorporated  by  reference to  Exhibit 4.4  to  USG
                      Corporation's Form 8-K, dated May 7, 1993).
                      The  Corporation and certain  of its consolidated subsidiaries  are parties to long-term
                      debt instruments under which the total  amount of securities authorized does not  exceed
                      10% of the total assets of the Corporation and its subsidiaries on a consolidated basis.
                      Pursuant  to paragraph  (b)(4)(iii)(A) of  Item 601  of Regulation  S-K, the Corporation
                      agrees to furnish a copy of such  instruments to the Securities and Exchange  Commission
                      upon request.
       5.  Opinions of counsel as to the legality of the securities being registered.                              **
      10.  Material contracts:
           (a)        Management  Performance Plan of USG Corporation (incorporated by reference to Annex C of
                      Amendment No. 8 to  USG Corporation's Registration Statement  No. 33-40136 on Form  S-4,
                      dated February 3, 1993).*
           (b)        1991-1993  Management  Incentive Compensation  Program  -- USG  Corporation,  as amended
                      (incorporated by reference to Exhibit 10(b)  of USG Corporation's 1991 Annual Report  on
                      Form 10-K, dated March 5, 1992).*
           (c)        Amendment  and Restatement of USG Corporation Supplemental Retirement Plan (incorporated
                      by reference to  Exhibit 10(e) of  USG Corporation's  1988 Annual Report  on Form  10-K,
                      dated March 29, 1989).*
           (d)        Amendment  and Restatement of USG Corporation Supplemental Retirement Plan, effective as
                      of July 1, 1993 and dated November 30, 1993.*
           (e)        First Amendment  of  USG  Corporation  Supplemental Retirement  Plan,  effective  as  of
                      November 15, 1993 and dated December 2, 1993.*
           (f)        Employment  Agreements (incorporated by reference to  Exhibit 10(g) of USG Corporation's
                      1991 Annual Report on Form 10-K, dated March 5, 1992).*
           (g)        Termination Compensation Agreements (incorporated by  reference to Exhibit 10(h) of  USG
                      Corporation's 1991 Annual Report on Form 10-K, dated March 5, 1992).*
           (h)        USG  Corporation Severance Plan  for Key Managers,  dated May 15,  1991 (incorporated by
                      reference to Exhibit 10(i) of USG Corporation's  1991 Annual Report on Form 10-K,  dated
                      March 5, 1992).*
           (i)        Restricted  Stock Award  Agreements (incorporated by  reference to Exhibit  10(j) of USG
                      Corporation's 1988 Annual Report on Form 10-K, dated March 29, 1989).*
           (j)        Restricted Stock Award Agreements, 1991 (incorporated  by reference to Exhibit 10(m)  of
                      USG Corporation's 1990 Annual Report on Form 10-K, dated March 18, 1991).*
           (k)        Agreements  to  Take  Deferred  Stock and  Matching  Restricted  Stock  (incorporated by
                      reference to Exhibit 10(k) of USG Corporation's  1989 Annual Report on Form 10-K,  dated
                      March 28, 1990).*
           (l)        Indemnification   Agreements  (incorporated  by  reference   to  Exhibit  10(l)  of  USG
                      Corporation's 1987 Annual Report on Form 10-K, dated March 30, 1988).*
           (m)        Form of Change  of Control Waiver  (incorporated by  reference to Exhibit  10(t) of  USG
                      Corporation's 1992 Annual Report on Form 10-K dated March 26, 1993).*
           (n)        Incentive  Recovery  Program --  Waiver of  Full Payment  (incorporated by  reference to
                      Exhibit 10(u) of  USG Corporation's 1992  Annual Report  on Form 10-K,  dated March  26,
                      1993).*
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                                                                            PAGE
- ---------                                                                                                       ---------
<C>        <S>        <C>                                                                                       <C>
           (o)        Rights  Agreement dated May 6, 1993 between USG Corporation and Harris Trust and Savings
                      Bank, as Rights Agent (incorporated  by reference to Exhibit 10.1  of Form 8-K filed  by
                      USG Corporation on May 7, 1993).
           (p)        Warrant Agreement dated May 6, 1993 between USG Corporation and Harris Trust and Savings
                      Bank,  as  Warrant  Agent,  relating  to  USG  Corporation's  Warrants  (incorporated by
                      reference to Exhibit 4.3 of Form 8-K filed by USG Corporation on May 7, 1993).
           (q)        Amended and Restated Credit Agreement dated as of May 6, 1993 among USG Corporation  and
                      USG  Interiors, Inc., as  borrowers; the Financial Institutions  listed on the signature
                      pages thereof, as  Senior Lenders; Bankers  Trust Company, Chemical  Bank and  Citibank,
                      N.A.,  as Agents; and Citibank, N.A., as Administrative Agent (incorporated by reference
                      to Exhibit 10.2 of Form 8-K filed by USG Corporation on May 7, 1993).
           (r)        First Amendment to Amended and Restated Credit Agreement between USG Corporation and USG
                      Interiors, Inc. as borrowers; the Financial  Institutions listed on the signature  pages
                      thereof,  as Senior Lenders; Bankers Trust Company, Chemical Bank and Citibank, N.A., as
                      Agents; and  Citibank,  N.A., as  Administrative  Agent (incorporated  by  reference  to
                      Exhibit  4M of USG Corporation's Registration Statement  No. 35-65804 on Form S-1, dated
                      July 9, 1993).
           (s)        Form  of  Second  Amendment  to  Amended  and  Restated  Credit  Agreement  between  USG
                      Corporation  and USG Interiors, Inc. as  borrowers; the Financial Institutions listed on
                      the signature pages thereof, as Senior Lenders; Bankers Trust Company, Chemical Bank and
                      Citibank, N.A., as Agents; and Citibank, N.A., as Administrative Agent.                      **
           (t)        Letter of Credit Issuance and  Reimbursement Agreement dated as  of May 6, 1993  between
                      USG  Interiors, Inc. and  Chemical Bank (incorporated  by reference to  Exhibit 10.12 of
                      Form 8-K filed by USG Corporation on May 7, 1993).
           (u)        Amended and  Restated Collateral  Trust Agreement  dated as  of May  6, 1993  among  USG
                      Corporation,  USG Interiors,  Inc. and USG  Foreign Investments, Ltd.,  as grantors, and
                      Wilmington Trust Company and William J. Wade, as Trustees (incorporated by reference  to
                      Exhibit 10.6 of Form 8-K filed by USG Corporation on May 7, 1993).
           (v)        Amended  and  Restated  Company Pledge  Agreement  dated as  of  May 6,  1993  among USG
                      Corporation, Wilmington Trust Company and William J. Wade (incorporated by reference  to
                      Exhibit 10.7 of Form 8-K filed by USG Corporation on May 7, 1993).
           (w)        Amended  and Restated  Subsidiary Pledge  Agreement dated  as of  May 6,  1993 among USG
                      Interiors, Inc., Wilmington Trust Company and William J. Wade (incorporated by reference
                      to Exhibit 10.8 of Form 8-K filed by USG Corporation on May 7, 1993).
           (x)        Amended and Restated  Subsidiary Pledge  Agreement dated  as of  May 6,  1993 among  USG
                      Foreign Investments, Ltd., Wilmington Trust Company and William J. Wade (incorporated by
                      reference to Exhibit 10.9 of Form 8-K filed by USG Corporation on May 7, 1993).
           (y)        Amended  and Restated Share Pledge  Agreement dated as of May  6, 1993 among USG Foreign
                      Investments, Ltd.,  Wilmington  Trust  Company  and William  J.  Wade  (incorporated  by
                      reference to Exhibit 10.10 of Form 8-K filed by USG Corporation on May 7, 1993).
           (z)        Amended  and  Restated  Deed  of Charge  dated  as  of  May 6,  1993  among  USG Foreign
                      Investments, Ltd.,  Wilmington  Trust  Company  and William  J.  Wade  (incorporated  by
                      reference to Exhibit 10.11 of Form 8-K filed by USG Corporation on May 7, 1993).
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                                                                            PAGE
- ---------                                                                                                       ---------
<C>        <S>        <C>                                                                                       <C>
           (aa)       Amended  and Restated Company Guaranty  dated as of May 6,  1993 made by USG Corporation
                      (incorporated by reference to Exhibit 10.3 of  Form 8-K filed by USG Corporation on  May
                      7, 1993).
           (ab)       Amended  and Restated Subsidiary Guaranty dated as of May 6, 1993 made by USG Interiors,
                      Inc. (incorporated by reference to Exhibit 10.1 of Form 8-K filed by USG Corporation  on
                      May 7, 1993).
           (ac)       Form of Amended and Restated Subsidiary Guaranty dated as of May 6, 1993 made by each of
                      United States Gypsum Company, USG Foreign Investments, Ltd., L&W Supply Corporation, USG
                      Interiors  International, Inc., La Mirada Products Co., Inc., Westbank Planting Company,
                      American Metals  Corporation and  USG  Industries, Inc.  (incorporated by  reference  to
                      Exhibit 10.5 of Form 8-K filed by USG Corporation on May 7, 1993).
           (ad)       Amendment  and Restatement  of USG Corporation  Investment Plan  for Salaried Employees,
                      effective January 1, 1989 (incorporated by  reference to Exhibit 4.18 of  Post-Effective
                      Amendment No. 1, dated November 9, 1988, to USG Corporation's Registration Statement No.
                      33-22581 on Form S-8).*
           (ae)       First   Amendment  of  USG  Corporation  Investment  Plan,  effective  January  1,  1989
                      (incorporated by reference to Exhibit 4.29 of Post-Effective Amendment No. 2, dated July
                      5, 1989, to USG Corporation's Registration Statement No. 33-22581 on Form S-8).*
           (af)       Second Amendment of  USG Corporation  Investment Plan,  effective January  1, 1989,  and
                      dated   December  29,  1989  (incorporated  by   reference  to  Exhibit  10(bb)  of  USG
                      Corporation's 1990 Annual Report on Form 10-K, dated March 18, 1991).*
           (ag)       Third Amendment of USG Corporation Investment Plan, effective January 1, 1989, and dated
                      November 21, 1990 (incorporated by reference to Exhibit 10(cc) of USG Corporation's 1990
                      Annual Report on Form 10-K, dated March 18, 1991).*
           (ah)       Fourth Amendment of USG Corporation Investment Plan, Third Amendment of USG  Corporation
                      Investment Trust, and Spinoff of Portion of Plan that Applies to Certain Former DAP Inc.
                      Employees,  effective August  31, 1991,  and dated  September 20,  1991 (incorporated by
                      reference to Exhibit 10(ff) of USG Corporation's 1991 Annual Report on Form 10-K,  dated
                      March 5, 1992).*
           (ai)       Fourth  Amendment of USG Corporation Investment  Trust, effective December 15, 1991, and
                      dated  December  18,  1991  (incorporated  by   reference  to  Exhibit  10(gg)  of   USG
                      Corporation's 1991 Annual Report on Form 10-K, dated March 5, 1992).*
           (aj)       Fifth Amendment of USG Corporation Investment Plan, effective January 1, 1991, and dated
                      December 18, 1991 (incorporated by reference to Exhibit 10(hh) of USG Corporation's 1991
                      Annual Report on Form 10-K, dated March 5, 1992).*
           (ak)       Fifth  Amendment of USG Corporation  Investment Trust, effective July  1, 1993 and dated
                      July 30, 1993.*
           (al)       Sixth Amendment of USG Corporation Investment Plan, dated July 30, 1993.*
           (am)       Asset Purchase Agreement among  USG Corporation, DAP Inc.,  BHI International Inc.,  DAP
                      Canada  Inc.,  Wassall PLC  and  Wassall USA  Acquisition  Inc., dated  August  23, 1991
                      (incorporated by reference to Exhibit 10(ah) of USG Corporation's Form 8-K, dated August
                      23, 1991).
           (an)       Consent and  Agreement dated  as of  August  22, 1991  with respect  to the  Old  Credit
                      Agreement  dated as of July 1, 1988 (incorporated  by reference to Exhibit 10(ai) of USG
                      Corporation's Form 8-K, dated August 23, 1991).
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                                                                                                            PAGE
- ---------                                                                                                       ---------
<C>        <S>        <C>                                                                                       <C>
           (ao)       First Amendment dated as  of March 12,  1993 with respect to  the Consent and  Agreement
                      dated  as  of  August 22,  1991  (incorporated by  reference  to Exhibit  10(ap)  of USG
                      Corporation's 1992 Annual Report on Form 10-K, dated March 26, 1993).
           (ap)       Deposit Agreement dated as of September  19, 1991 (incorporated by reference to  Exhibit
                      10(aq) of USG Corporation's 1992 Annual Report on Form 10-K, dated March 26, 1993).
           (aq)       First  Amendment dated as  of March 12,  1993 to the  Deposit Agreement (incorporated by
                      reference to Exhibit 10(ar) of USG Corporation's 1992 Annual Report on Form 10-K,  dated
                      March 26, 1993).
           (ar)       Agreement  among USG Corporation and  the Ad Hoc Committee of  Holders of 13 1/4% Senior
                      Subordinated Debentures  of  USG Corporation  due  2000 (incorporated  by  reference  to
                      Exhibit  10(aq)  of Amendment  No.  4 to  USG  Corporation's Registration  Statement No.
                      33-40136 on Form S-4).
           (as)       Letter Agreement dated February 25, 1993  among USG Corporation, Water Street  Corporate
                      Recovery   Fund,  L.P.,  the  Goldman  Sachs  Group,  L.P.  and  Goldman,  Sachs  &  Co.
                      (incorporated by reference to Exhibit 10(au) of USG Corporation's 1992 Annual Report  on
                      Form 10-K, dated March 26, 1993).
           (at)       Bankruptcy  Court Order issued  April 23, 1993  confirming USG Corporation's Prepackaged
                      Plan of Reorganization (incorporated by reference to  Exhibit 28.1 of Form 8-K filed  by
                      USG Corporation on May 7, 1993).
           (au)       Consulting  Agreement  dated  July 1,  1990,  as  amended March  23,  1992,  between USG
                      Corporation and  William  L. Weiss  (incorporated  by  reference to  Exhibit  10(au)  of
                      Amendment  No. 4 to USG  Corporation's Registration Statement No.  33-40136 on Form S-4,
                      dated November 12, 1992).
           (av)       Consulting Agreement dated May 6, 1993 between USG Corporation and Jack D. Sparks.
           (aw)       Consulting Agreement dated August 11, 1993 between USG Corporation and James W. Cozad.
           (ax)       1993 Annual Management Incentive Program  -- USG Corporation (incorporated by  reference
                      to  Exhibit 10(b) of Amendment  No. 1 to Form  S-1 filed by USG  Corporation on June 16,
                      1993).*
           (ay)       Form of Employment Agreement  dated May 12, 1993  (incorporated by reference to  Exhibit
                      10(h) of Amendment No. 1 to Form S-1 filed by USG Corporation on June 16, 1993).*
           (az)       Amendment  of Termination Compensation Agreements  (incorporated by reference to Exhibit
                      10(j) of Amendment No. 1 to Form S-1 filed by USG Corporation on June 16, 1993).*
           (ba)       Form of Nonqualified  Stock Option  Agreement effective  June 1,  1993 (incorporated  by
                      reference  to Exhibit 10(l) of Amendment  No. 1 on Form S-1  filed by USG Corporation on
                      June 16, 1993).*
           (bb)       Form of Nonqualified Stock Option Agreement with Anthony J. Falvo, Jr. effective June 1,
                      1993 (incorporated by reference to Exhibit 10(m) of Amendment No. 1 to Form S-1 filed by
                      USG Corporation on June 16, 1993).*
           (bc)       Form of First Amendment to Amended and Restated Collateral Trust Agreement (incorporated
                      by reference to Exhibit 10(w) of Amendment No. 1 to Form S-1 filed by USG Corporation on
                      July 13, 1993).
           (bd)       Form of First  Amendment to Amended  and Restated Subsidiary  Guaranty (incorporated  by
                      reference  to Exhibit 10(ae) of Amendment No. 2  to Form S-1 filed by USG Corporation on
                      July 16, 1993).
      24.  Consents of Experts and Counsel
           (a)        Consent of Arthur Andersen & Co.
           (b)        Consents of counsel (included in Exhibit 5).
      25.  Power of Attorney
</TABLE>
<PAGE>

                                                 APPENDIX

Narrative description of graphic:

   A graphic depiction of the table on page 39.


<PAGE>


                                                                 EXHIBIT 10(d)




                         AMENDMENT AND RESTATEMENT
                                     OF
                USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN


WHEREAS, USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN (the "Plan") was
established effective January 1, 1976 (and then was named "United States
Gypsum Company Supplemental Retirement Plan"); and


WHEREAS, the Plan, as amended and restated effective as of January 1, 1989,
has subsequently been amended from time to time, and it now is considered
desirable to further amend and restate the Plan in its entirety;


NOW, THEREFORE, pursuant to the amending power reserved to USG Corporation as
the "Company" under Section 7 of the Plan, as amended, the Plan (including
Supplement A thereto) be and hereby is further amended and restated in its
entirety effective as of July 1, 1993 in the form attached hereto as Exhibit
A.


                                *     *     *


IN WITNESS WHEREOF, the Company has caused these presents to be signed on its
behalf by an officer thereunto duly authorized this 30th day of November,
1993.


                              USG CORPORATION



                              By____________________________________________
                                              Senior Vice President and
                                             Chief Administrative Officer




<PAGE>








                                                                   Exhibit A




               USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN

           (As Amended and Restated Effective as of July 1, 1993)















                           McDermott, Will & Emery
                              Chicago, Illinois




<PAGE>








                             TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                        PAGE
<S>                                                                     <C>
SECTION 1                                                                  1
      Introduction                                                         1
            The Plan, the Company                                          1
            Employers                                                      1
            Purpose                                                        1
            Plan Administration                                            3
            Preservation of Benefits                                       3

SECTION 2                                                                  4
      Eligibility for Participation                                        4
            Covered Employee                                               4
            Eligibility                                                    4
            Period of Participation                                        4

SECTION 3                                                                  5
      Part A Supplemental Benefits                                         5
            Intent                                                         5
            Limited Benefits, Unlimited Benefits, Part A
               Supplemental Benefits and Part A Supplemental
               Death Benefits                                              5
            Participant Contribution Requirement                           6
            Compensation Deferral Elections                                6
            Amount of Part A Supplemental Benefits                         7
            Payment of Part A Supplemental Benefits                        8
            Amount and Payment of Part A Supplemental Death Benefits       9

SECTION 4                                                                 12
      Part B Supplemental Benefits                                        12
            Intent                                                        12
            Part B Supplemental Benefits and Part B Supplemental Death
               Benefits                                                   12
            Elective Participant Contributions                            12
            Additional Elective Participant Contributions                 13
            Employer Matching Contributions                               13
            Separate Accounts, Subaccounts, Deemed Investments            14
            Withdrawals                                                   14
            Vesting of Accounts                                           15
            Distribution of Accounts                                      15

SECTION 5                                                                 17
      Spouses, Beneficiaries, Funding                                     17
            Eligible Spouse                                               17
            Supplemental Plan Beneficiary                                 17


</TABLE>

                                      -i-

<PAGE>

<TABLE>
<CAPTION>
                                                                        PAGE
<S>                                                                     <C>
            Funding                                                       17

SECTION 6                                                                 18
      General Provisions                                                  18
            Statement of Accounts                                         18
            Employment Rights                                             18
            Interests Not Transferable                                    18
            Controlling Law                                               18
            Gender and Number                                             18
            Action by the Company                                         18
            Successor to the Company or Any Other Employer                18
            Facility of Payment                                           19

SECTION 7                                                                 20
      Amendment and Termination                                           20

SUPPLEMENT A

</TABLE>

                                     -ii-

<PAGE>



               USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN


                                 SECTION 1

                               INTRODUCTION



1.1.  THE PLAN, THE COMPANY.  Effective January 1, 1976 UNITED STATES GYPSUM
COMPANY established UNITED STATES GYPSUM COMPANY SUPPLEMENTAL RETIREMENT PLAN
(the "Plan").  On January 1, 1985 UNITED STATES GYPSUM COMPANY became a
wholly-owned subsidiary of USG CORPORATION and effective as of that date USG
CORPORATION was substituted for UNITED STATES GYPSUM COMPANY as the "Company"
under the Plan and the name of the Plan was changed to USG CORPORATION
SUPPLEMENTAL RETIREMENT PLAN.  The term "Company" as used in the Plan means
UNITED STATES GYPSUM COMPANY up to January 1, 1985 and USG CORPORATION (and
any successor thereto) on and after that date.  The provisions of this
subsection and the following provisions of the Plan constitute an amendment
and restatement of the Plan, as previously amended, effective as of July 1,
1993 (the "New Effective Date"), subject to any subsequent amendments.


1.2.  EMPLOYERS.  Each subsidiary of the Company that is an employer under
USG Corporation Retirement Plan (the "Retirement Plan") or under USG
Corporation Investment Plan (the "Investment Plan") shall be an "Employer"
under this Plan unless specified to the contrary by the Company by writing
filed with the Committee described in subsection 1.4.


1.3.  PURPOSE.  The Company and certain of its subsidiaries maintain and are
employers under the Retirement Plan and the Investment Plan, each of which plans
is intended to meet the requirements of a "qualified plan" under Section 401(a)
of the Internal Revenue Code.  The purpose of this Plan, a nonqualified plan, is
to provide for eligible employees benefits that could have been earned and paid
under the Retirement and Investment Plans and under any other qualified defined
benefit and defined contribution plans maintained by the controlled group of
corporations of which the Company is a member ("other USG Defined Benefit and
Defined Contribution Plans") but for the following limitations:

      (a)   Section 401(a)(4) of the Internal Revenue Code requires that
            contributions or benefits provided under a qualified plan must not
            discriminate in favor of highly compensated employees and there-

<PAGE>

            fore amounts deferred by employees, if any, under the Company's
            management incentive compensation programs until their retirement
            or other termination of employment may not be considered as a part
            of their employment compensation in determining the amount of their
            contributions, benefits provided with respect to their
            contributions, and employer provided benefits under the Retirement
            and Investment Plans and other USG Defined Benefit and Defined
            Contribution Plans.

      (b)   Sections 401(a)(17) and 404(l) of the Internal Revenue Code limit
            the amount of employees' annual compensation that may be taken
            into account in determining the benefits that may be paid to them
            from the Retirement and Investment Plans and other USG Defined
            Benefit and Defined Contribution Plans and the deductible Employer
            contributions that may be made to those plans to provide such
            benefits.

      (c)   Sections 401(k) and 401(m) of the Internal Revenue Code require
            that employees' before-tax contributions and Employer matching
            contributions under USG Defined Contribution Plans be tested to
            prevent discrimination in favor of highly compensated employees
            and as a result of such tests employees' before-tax contributions
            and shares of Employer matching contributions under such plans may
            be limited.

      (d)   Sections 401(a)(4) and 401(l) of the Internal Revenue Code limit
            the extent to which disparate benefits may be provided under
            qualified retirement plans and as a result benefits accrued under
            the Retirement Plan (and other USG Defined Benefit Plans) may be
            limited.

      (e)   Section 402(g) of the Internal Revenue Code limits the amount of
            before-tax contributions that an employee may make under the
            Investment Plan and other USG Defined Contribution Plans.

      (f)   Section 415 of the Internal Revenue Code places limitations on the
            amount of benefits that may be paid from and contributions that
            may be made to the Retirement Plan and the Investment Plan and
            other USG Defined Benefit and Defined Contribution Plans.


                                      -2-

<PAGE>


Effective October 1, 1993, the Plan will also allow Participants to elect to
make before-tax contributions to the Plan in excess of the amount of
contributions permitted under the terms of the Investment Plan.  In no event
shall any benefits be payable under this Plan that would duplicate benefits
that become payable under any other qualified or nonqualified plan maintained
by the Company, any other Employer or any other member of the controlled group
of corporations of which the Company is a member.


1.4.  PLAN ADMINISTRATION.  The Plan is administered by the committee (the
"Committee") that is responsible for administration of the Retirement Plan.
To the extent appropriate, the Committee has, concerning Part A Supplemental
Benefits and Part A Supplemental Death Benefits described in Section 3, the
same powers, rights, duties and obligations it has as to the Retirement Plan
and, concerning Part B Supplemental Benefits and Part B Supplemental Death
Benefits described in Section 4, the same powers, rights, duties and
obligations as are vested in the committee responsible for administration of
the Investment Plan, including the right to require the completion of such
forms or applications with respect to benefit payments as it deems
appropriate.

1.5.  PRESERVATION OF BENEFITS.  Benefits shall be provided under the Plan
on and after the New Effective Date to, or with respect to, former employees
of the Company who became entitled to such benefits before that date in
accordance with the terms of the Plan as in effect at the time of their
retirement or other termination of employment.  If an employee of an Employer
was participating in the Plan immediately prior to the New Effective Date and
continues to participate in the Plan on and after that date, benefits payable
under this Plan to, or with respect to, such employee shall not be less than
what they would have been if the Plan as in effect immediately prior to the
New Effective Date continued in effect on and after that date without change,
but only taking into account for this purpose benefits accrued by the employee
under the Retirement Plan and all other USG Defined Benefit Plans prior to the
New Effective Date.

                                      -3-

<PAGE>


                                 SECTION 2

                       ELIGIBILITY FOR PARTICIPATION


2.1.  COVERED EMPLOYEE.  A "Covered Employee" means an employee of an
Employer under the Plan who is a highly compensated employee as defined in
Section 414(q) of the Internal Revenue Code, unless the Committee specifies
that such employee shall not be considered as a Covered Employee for any
purpose of the Plan by writing filed with the Secretary of the Company prior
to, or within 30 days after, the date the employee otherwise would become
eligible for participation in the Plan.


2.2.  ELIGIBILITY.  Subject to the conditions and limitations of the Plan,
each employee of an Employer who was a "Participant" in the Plan on June 30,
1993 shall continue as a Participant in the Plan after that date.  Subject to
the conditions and limitations of the Plan, each other employee of an Employer
shall become eligible to enroll in this Plan and become a "Participant" on the
first date occurring on or after the New Effective Date on which:

      (a)   he is a Covered Employee; and

      (b)   the benefits he accrues, or the contributions he is required to
            make or could elect to make, or his share of employer derived
            contributions under one or more of the Retirement Plan, the
            Investment Plan, and other USG Defined Benefit and Defined
            Contribution Plans, are less than what they would have been (or,
            as to elected contributions, could have been) as a result of the
            limitations described in subsection 1.3.

Each employee will be notified of the date he is eligible to enroll in the
Plan and become a Participant and will be furnished with an enrollment form
pursuant to appropriate enrollment procedures established by the Committee.


2.3.  PERIOD OF PARTICIPATION.  An employee of an Employer who becomes a
Participant in this Plan will continue as a Participant in the Plan in
accordance with its provisions until all benefits to which he is entitled
under the Plan have been distributed to him.

                                      -4-

<PAGE>



                                 SECTION 3

                       PART A SUPPLEMENTAL BENEFITS


3.1.  INTENT.  The Employers intend that benefits be provided pursuant to
the provisions of this Section 3 that are actuarially equivalent to the
benefits that would have been provided under the Retirement Plan and other USG
Defined Benefit Plans if the limitations described in subsection 1.3 did not
exist, if before-tax contributions the Participant makes pursuant to
subsection 3.3 had been made under the Retirement Plan and any other
applicable USG Defined Benefit Plan on an after-tax basis, and if amounts
deferred under the Company's 1989 and subsequent management incentive
compensation programs or deferred under subsections 4.3 and 4.4 of the Plan
had not been deferred but instead paid at the proper time and included in
employment compensation for purposes of the Plans, provided that the
contribution requirement described in subsection 3.3 is met.


3.2.  LIMITED BENEFITS, UNLIMITED BENEFITS, PART A SUPPLEMENTAL BENEFITS AND
PART A SUPPLEMENTAL DEATH BENEFITS.  For purposes of this Section 3, the term
"Limited Benefits" means the benefits that become payable to or with respect
to a Participant under the Retirement Plan and all other USG Defined Benefit
Plans.  The term "Unlimited Benefits" means the benefits that would have
become payable to or with respect to a Participant under such Plans if the
limitations described in subsection 1.3 did not exist, if before-tax
contributions the Participant makes pursuant to subsection 3.3 had been made
under the Retirement Plan and any other applicable USG Defined Benefit Plan on
an after-tax basis, and if amounts deferred by the Participant under the
Company's 1989 and subsequent management incentive compensation programs or
deferred under subsections 4.3 and 4.4 of the Plan had not been deferred but
instead paid to the Participant at the proper time during employment and then
included in the Participant's employment compensation for purposes of those
Plans.  Benefits that become payable under this Section 3 to a Participant are
referred to as "Part A Supplemental Benefits".  Benefits that become payable
under this Section 3 to any person as a result of the death of a Participant
are referred to as "Part A Supplemental Death Benefits".


3.3.  PARTICIPANT CONTRIBUTION REQUIREMENT.  A Participant's entitlement to
Part A Supplemental Benefits and Part A Supplemental Death Benefits described
in subsections 3.5 and 3.7 is

                                      -5-

<PAGE>


subject to the Participant making before-tax contributions under this Plan.
Such contributions must equal the after-tax contributions the Participant
would have been required to make under the Retirement Plan and all other USG
Defined Benefit Plans:

      (a)   if amounts contributed on a before-tax basis under this Plan,
            deferred by the Participant under the Company's management
            incentive compensation programs, or deferred under subsections 4.3
            and 4.4 of the Plan had not been so contributed or deferred but
            paid to the Participant at the proper time during employment and
            then included in the Participant's employment compensation for
            purposes of those plans;

      (b)   if the annual compensation limitation imposed by Section 401(a)(17)
            of the Internal Revenue Code (as described in subparagraph 1.3(b))
            did not apply to the Participant; and

      (c)   if the limitations imposed under Section 415 of the Internal
            Revenue Code (as described in subparagraph 1.3(f)) did not apply
            to the Participant.

Notwithstanding the foregoing, a participant who elects to continue making
after-tax contributions under the Retirement Plan or another USG Defined
Benefit Plan even though the limitations imposed under Section 415 of the
Internal Revenue Code prevent him from accruing benefits under such plans,
will accrue benefits under this Plan based on such after-tax contributions as
if they had been made under this Plan on a before-tax basis.  The Committee
shall maintain a bookkeeping account in the name of each Participant who makes
before-tax contributions under this subsection to reflect such contributions
and, where required, interest on such contributions.  The term "interest" as
used in this Plan with respect to Participants' before-tax contributions made
under this subsection shall mean "interest" as defined in the Retirement Plan
with respect to participant contributions under that plan but shall not
include a higher rate of interest required to be applied under the Retirement
Plan for certain purposes pursuant to Section 411(c)(2) of the Internal
Revenue Code.


3.4.  COMPENSATION DEFERRAL ELECTIONS.  A Participant's before-tax
contributions under this Section 3 shall be made pursuant to a compensation
deferral election filed with his Employer prior to the calendar year such
contributions are to begin or, in the case of a Participant who first becomes
eligible to make

                                      -6-

<PAGE>


such contributions during but after the beginning of a calendar year, filed
with his Employer not more than 30 days after so becoming eligible, subject to
the following:

      (a)   The Participant's election shall apply to employment compensation
            otherwise payable after the later to occur of the date the
            Participant becomes eligible to make before-tax contributions and
            the date the election is filed with his Employer.

      (b)   Such election shall be automatically revoked if the Participant
            ceases to be a Covered Employee and such revocation shall be
            effective as to employment compensation the Participant is
            entitled to receive during the period he ceases to be a Covered
            Employee.

      (c)   Such election may be voluntarily revoked by the Participant before
            the beginning of any subsequent calendar year.  A voluntary
            revocation shall be effective as to employment compensation the
            Participant is entitled to receive during that and subsequent
            calendar years unless prior to the commencement of any subsequent
            calendar year the Participant makes another compensation deferral
            election.  Such later election shall apply as to employment
            compensation otherwise payable during calendar years beginning
            after the election is made.

Any period during which a Participant does not make contributions under the
Plan (and, where applicable, also does not elect to make after-tax
contributions under the Retirement Plan or another USG Defined Benefit Plan
upon which benefits would accrue under this Plan) shall be disregarded for
purposes of any subsequent calculation of benefit service (as defined in
subsection 4.3 of the Retirement Plan) or compensation (as described in
subsection 3.3 above for purposes of determining contributions under this
Plan) used in determining the Participant's Unlimited Benefits for a
subsequent Plan year.


3.5.  AMOUNT OF PART A SUPPLEMENTAL BENEFITS.  Subject to the contribution
requirement described in subsection 3.3, Part A Supplemental Benefits shall
become payable under the Plan to a Participant upon the Participant's
retirement or earlier termination of employment with the Company and its
subsidiaries.  A Participant's Part A Supplemental Benefits shall be in an
amount that is actuarially equivalent to the amount by which the Participant's
Unlimited Benefits exceed the Participant's

                                      -7-

<PAGE>


Limited Benefits.  For purposes of this Section 3, actuarially equivalent
benefits shall be calculated on the basis of the actuarial factors,
assumptions and tables applied for that purpose under the Retirement Plan, to
the extent deemed appropriate by the Committee.


3.6.  PAYMENT OF PART A SUPPLEMENTAL BENEFITS.  Subject to the provisions of
this subsection 3.6, Part A Supplemental Benefits shall be paid in a lump sum
within 30 days after such benefits become payable or, if the entire amount of
such benefits cannot be determined by the Committee within that 30 day period,
payment shall be made in one or more installments as determined by the
Committee but with the last payment due by the 30th day following the date the
Committee determines the total amount of such benefits.  The Committee in its
discretion may from time to time establish rules incorporating objective
standards that shall govern the form of payment of Part A Supplemental
Benefits that initially become payable during a subsequent calendar year.  A
copy of such rules, certified by the Chairman or Secretary of the Committee,
shall be filed with the Secretary of the Company before the beginning of the
calendar year for which they first become effective.  Any such rules in effect
at the start of a calendar year may not be modified or rescinded in that
calendar year or thereafter with respect to the form of payment of Part A
Supplemental Benefits that initially become payable to any person under the
Plan during that calendar year.  Notwithstanding the foregoing provisions of
this subsection:

      (a)   Payment of a Participant's Part A Supplemental Benefits must be
            made or commence not later than February 1 of the calendar year
            next following the calendar year in which he attains age 65 years
            or, if later, his termination of employment with the Company and
            its subsidiaries occurs.

      (b)   If the Committee determines that a Participant whose Part A
            Supplemental Benefits are being paid over a period of more than
            one year has incurred a severe financial hardship as a result of
            the occurrence of an unanticipated event beyond the Participant's
            control, the Committee may direct that an advance payment of part
            or all of the Covered Participant's Part A Supplemental Benefits
            be made, but the amount thereof shall not exceed the amount needed
            for such financial hardship.

      (c)   If a Change in Control as determined in accordance with the
            provisions of Section 18 of the

                                      -8-

<PAGE>


            Retirement Plan as in effect on the New Effective Date should
            occur, Part A Supplemental Benefits that initially became payable
            to a Participant before the Change in Control but have not been
            paid or paid in full shall be distributed in accordance with the
            same form of payment as in effect with respect to those benefits
            immediately prior to the Change in Control, but any Part A
            Supplemental Benefits that initially become payable after the
            Change in Control shall be distributed in a lump sum to the person
            entitled thereto within 30 days after they become payable.

      (d)   If a Participant's death occurs while employed by the Company or
            any subsidiary of the Company or if a Participant's death occurs
            after he had become entitled to Part A Supplemental Benefits but
            before payment of such benefits has commenced or has been
            completed, Part A Supplemental Death Benefits shall be payable
            with respect to the Participant only if and to the extent provided
            in subsection 3.7.

      (e)   Spousal consent rules that apply under the Retirement Plan or any
            other USG Defined Benefit Plan with respect to forms of payment of
            benefits shall not apply under this Plan.


3.7.  AMOUNT AND PAYMENT OF PART A SUPPLEMENTAL DEATH BENEFITS.  Part A
Supplemental Death Benefits shall be payable under the Plan as follows:

      (a)   If a Participant's death occurs while employed by the Company or a
            subsidiary of the Company and if he had an Eligible Spouse (as
            defined in subsection 5.1) immediately prior to his death, the
            Participant's Eligible Spouse shall be entitled to monthly Part A
            Supplemental Death Benefits under this Plan equal to the
            additional monthly pre-retirement survivor annuity benefits that
            would have been payable to the Participant's Eligible Spouse under
            the Retirement Plan and all other USG Defined Benefit Plans if the
            Participant's Limited Benefits equalled his Unlimited Benefits.
            The first payment to a Participant's Eligible Spouse under this
            subsection shall be made as of the beginning of the calendar month
            next following the calendar month during which the Participant's
            death occurs and

                                      -9-

<PAGE>


            the final payment shall be made as of the beginning of the
            calendar month during which the Eligible Spouse's death occurs.
            If the Participant did not have an Eligible Spouse at the time of
            his death, no Part A Supplemental Death Benefits shall be payable
            under the Plan with respect to that Participant other than payment
            to the Participant's Supplemental Plan Beneficiary (as defined in
            subsection 5.2) of an amount equal to the Participant's before-tax
            contributions under the Plan with interest as soon as practicable
            after the Participant's death.

      (b)   If a Participant's death occurs after he had both retired (or
            otherwise terminated employment) and become entitled to Part A
            Supplemental Benefits but before payment of such benefits had been
            made or had commenced, and if he had an Eligible Spouse at the
            time of his death, the Participant's Eligible Spouse shall be
            entitled to monthly Part A Supplemental Death Benefits equal to 50
            percent of the additional monthly amount that would have been
            payable to the Participant under the Retirement Plan and all other
            USG Defined Benefit Plans in the form of a qualified joint and
            survivor annuity if the Participant's Limited Benefits equalled
            his Unlimited Benefits and if his benefit commencement date under
            such Plans had occurred immediately prior to his death or, if
            later, at his normal retirement date.  The first payment to a
            Participant's Eligible Spouse under this subparagraph shall be
            made as of the beginning of the calendar month next following the
            calendar month during which the Participant's death occurs or, if
            later, the month in which the Participant would have attained age
            55 years, and the final payment shall be made as of the beginning
            of the calendar month during which the Eligible Spouse's death
            occurs.  If the Participant did not have an Eligible Spouse at the
            time of his death, no Part A Supplemental Death Benefits shall be
            payable under the Plan with respect to that Participant other than
            payment to the Participant's Supplemental Plan Beneficiary of an
            amount equal to the Participant's before-tax contributions under
            this Plan with interest as soon as practicable after the
            Participant's death.

                                      -10-

<PAGE>


       (c)  If a Participant's death occurs while receiving Part A
            Supplemental Benefits, his Supplemental Plan Beneficiary shall be
            entitled to Part A Supplemental Death Benefits equal to the death
            benefits, if any, payable under the form of payment of his Part A
            Supplemental Benefits.

                                      -11-

<PAGE>


                                 SECTION 4

                       PART B SUPPLEMENTAL BENEFITS


4.1.  INTENT.  Commencing on the New Effective Date, the provisions of this
Section 4 are intended to allow a Participant to elect to make part or all of
the additional before-tax contributions he could have made under the
Investment Plan and all other USG Defined Contribution Plans, and to earn the
additional matching contributions that would have been made by his Employer
and credited to his accounts under those plans as a result of such additional
before-tax contributions, if the limitations described in subsection 1.3 did
not exist and if amounts contributed on a before-tax basis under this Plan or
deferred by the Participant under the Company's 1989 and subsequent management
incentive compensation programs had not been so contributed or deferred but
instead paid to the Participant at the proper time during employment and then
included in the Participant's employment compensation for purposes of those
plans.  Effective October 1, 1993, this Section 4 also permits Participants to
make additional before-tax contributions to the Plan in excess of the amount
permitted under the terms of the Investment Plan.


4.2.  PART B SUPPLEMENTAL BENEFITS AND PART B SUPPLEMENTAL DEATH BENEFITS.
Benefits that become payable under this Section 4 to a Participant are
referred to as "Part B Supplemental Benefits".  Benefits that become payable
under this Section 4 to any person as a result of the death of a Participant
are referred to as "Part B Supplemental Death Benefits".


4.3.  ELECTIVE PARTICIPANT CONTRIBUTIONS.  A Participant may elect to make
part or all of the additional before-tax contributions described in subsection
4.1.  A Participant's before-tax contributions under this subsection 4.3 shall
be made by a compensation deferral election filed with his Employer prior to
the calendar year such contributions are to begin or, for contributions to be
made in 1993, before the New Effective Date.  If a Participant first becomes
eligible to make such contributions during 1993 but after the New Effective
date or during but after the beginning of any subsequent calendar year, such
Participant's deferral election must be filed with his Employer not more than
30 days after so becoming eligible.  A Participant's compensation deferral
election under this subsection 4.3 shall apply to employment compensation
otherwise payable after the later to occur of the date the Participant becomes
eligible to make before-tax contributions and the date

                                      -12-

<PAGE>


the election is filed with his Employer.  A Participant's compensation
deferral election may be revoked by the Participant before the beginning of
any subsequent calendar year.  The revocation shall be effective as to
employment compensation the Participant is entitled to receive during that and
subsequent calendar years unless prior to the commencement of any subsequent
calendar year the Participant makes another compensation deferral election.
Such later election shall apply as to employment compensation otherwise
payable during calendar years beginning after such later election is made.
Notwithstanding the foregoing, a Participant's compensation deferral election
automatically shall be revoked for any period he ceases to be a highly
compensated employee as defined in Section 414(q) of the Internal Revenue
Code.

4.4.  ADDITIONAL ELECTIVE PARTICIPANT CONTRIBUTIONS.  Effective October 1,
1993, a Participant who is making the maximum permitted deferral under
subsection 4.3 may elect to make additional before-tax contributions pursuant
to this subsection 4.4.  Such additional contributions shall be a percentage
(ranging from one to eleven percent, in whole number increments) of the
Participant's employment compensation.  A Participant's before-tax
contributions under this subsection 4.4 shall be made by a compensation
deferral election filed with his Employer prior to the calendar year such
contributions are to begin or, for contributions to be made in 1993, before
October 1, 1993.  If a Participant first becomes eligible to make
contributions under this subsection 4.4 during 1993 but after October 1, 1993
or during but after the beginning of any subsequent calendar year, such
Participant's deferral election must be filed with his Employer not more than
30 days after so becoming eligible.  A Participant's compensation deferral
election under this subsection 4.4 shall apply to employment compensation
otherwise payable after the later to occur of the date the Participant becomes
eligible to make before-tax contributions and the date the election is filed
with his Employer.  A Participant may revoke or reinstate his deferral
election under this subsection 4.4 in accordance with the rules on revocation
and reinstatement of deferral elections found in subsection 4.3.

4.5.  EMPLOYER MATCHING CONTRIBUTIONS.  A Participant who makes before-tax
contributions under subsection 4.3 shall be entitled to "Employer Matching
Contributions" under this Plan equal to the additional "corporation matching
contributions" he would have been entitled to receive under the Investment
Plan if such before-tax contributions were permitted to be made under the
Investment Plan.  Employer matching contributions will not be made on any
before-tax contributions made pursuant to subsection 4.4.  For purposes of
this Section 4, "corporation match-

                                      -13-

<PAGE>

ing contributions" means all forms of matching contributions provided for in
Section 4 of the Investment Plan.

4.6.  SEPARATE ACCOUNTS, SUBACCOUNTS, DEEMED INVESTMENTS.  The Committee
shall maintain a bookkeeping account in the name of each Participant who makes
before-tax contributions under this Section 4 and shall maintain a separate
bookkeeping account in his name to reflect Employer Matching Contributions
attributable to such before-tax contributions.  One half of any contributions
made pursuant to subsections 4.3, 4.4 and 4.5, shall be deemed, when made, to
be invested in the "fixed income fund" maintained under the Investment Plan;
the remaining half of any such contributions, when made, shall be deemed to be
invested in the "equity index fund" maintained under the Investment Plan.  The
Committee may maintain such subaccounts as it deems necessary to effect the
immediately preceding sentence.  Any reference to a Participant's "account"
shall include all subaccounts established on behalf of the Participant by the
Committee in accordance with the preceding sentence.  Each participant's
accounts and subaccounts shall be adjusted as of the end of each calendar
quarter (and on any other dates the accounts of participants in the Investment
Plan are adjusted) to reflect the balances that would have been in such
accounts if they had in fact been maintained under the Investment Plan as
described above.


4.7.  WITHDRAWALS.  No withdrawals may be made under this Plan with respect
to a Participant's accounts prior to the Participant's termination of
employment with the Company and all of its subsidiaries other than hardship
withdrawals described below.  Effective as of the close of a calendar quarter,
after Participants' accounts have been adjusted as of the end of that quarter,
a Participant may request a withdrawal from his account which reflects his
before-tax contributions in the same manner and subject to the same conditions
and limitations as are set forth in the Investment Plan for hardship
withdrawals from participants' before-tax accounts.  Although such conditions
and limitations do not apply to an employee participating in the Investment
Plan who has attained age 59-1/2 years, such conditions and limitations shall
be deemed to apply to a Participant in this Plan who has attained age 59-1/2
years.  However, if a Participant incurs a hardship, he must request a
hardship withdrawal under this Plan to the extent required to satisfy the
immediate and heavy financial need caused by such hardship (subject to the
sufficiency of the before-tax contributions credited to such account of the
Participant under this Plan) before he may request a hardship withdrawal under
the Investment Plan or any other USG Defined Contribution Plan.  A withdrawal
requested by a Participant as of the end of a calendar quarter, if approved by
the Committee, shall be made

                                      -14-

<PAGE>


from the Plan during the next following calendar quarter.  The amount of the
withdrawal shall be charged to the appropriate account of the Participant as
of the end of the calendar quarter in which the withdrawal is actually made
but prior to adjusting such account under subsection 4.6 to reflect
hypothetical investment earnings (or losses) for that quarter.


4.8.  VESTING OF ACCOUNTS.  Upon a Participant's termination of employment
with the Company and all of its subsidiaries, the Participant (or in the event
of his death, his Supplemental Plan Beneficiary, as defined in subsection 5.2)
shall be entitled to the entire balance in the Participant's account which
reflects his before-tax contributions made under this Section 4 (subject to
quarterly adjustments required of such account until complete distribution
thereof).  The Participant or Supplemental Plan Beneficiary, as the case may
be, shall be entitled to that portion of the balance in the Participant's
account which reflects the Participant's share of Employer Matching
Contributions the Participant or Supplemental Plan Beneficiary would have been
entitled to under the Investment Plan if such contributions were "corporation
matching contributions" made under the Investment Plan and such account had
been maintained as a "corporation account" under that Plan (subject to
quarterly adjustments required of such account until complete distribution of
the vested portion thereof).

4.9.  DISTRIBUTION OF ACCOUNTS.  Subject to the provisions of this
subsection 4.9, Part B Supplemental Benefits shall be paid in a lump sum
within 30 days after the end of the calendar quarter in which such benefits
become payable or, if the entire amount of such benefits cannot be determined
by the Committee within that period, payment shall be made in one or more
installments as determined by the Committee but with the last payment due by
the 30th day following the date the Committee determines the total amount of
such benefits.  The Committee in its discretion may from time to time
establish rules incorporating objective standards that shall govern the form
of payment of Part B Supplemental Benefits that initially become payable
during a subsequent calendar year.  The distribution options for Part B
Supplemental Benefits established by the Committee under this subsection 4.9
may differ from the distribution options established by the Committee under
subsection 3.6 for the distribution of Part A Supplemental Benefits, but shall
be established in the same manner and subject to the same conditions and
limitations as are set forth in subsection 3.6, except that subparagraph
3.6(d) shall not apply in the event of the death of a Participant.  Upon a
Participant's death, whether before or after the Participant's termination of
employment, the Participant's Part B Supplemental Death Benefits (the
remaining balances in the accounts reflecting his

                                      -15-

<PAGE>


before-tax contributions made under this Section 4 and Employer Matching
Contributions) shall be distributed to the Participant's Supplemental Plan
Beneficiary in a lump sum as soon as practicable after the Participant's death
unless the Participant had, prior to his death, irrevocably elected another
means of distribution established by the Committee under this subsection 4.9.

                                      -16-

<PAGE>


                                 SECTION 5

                      SPOUSES, BENEFICIARIES, FUNDING


5.1.  ELIGIBLE SPOUSE.  The spouse of a Participant will be considered as an
"Eligible Spouse" as of any date only if at least six months prior thereto the
Participant and his spouse were lawfully married under the laws of the state
where the marriage was contracted and the marriage remains legally effective.


5.2.  SUPPLEMENTAL PLAN BENEFICIARY.  A "Supplemental Plan Beneficiary"
means a person who has been designated by a Participant as such by writing
signed by the Participant and filed with the Committee prior to the
Participant's death.  If a Participant failed to designate a Supplemental Plan
Beneficiary or if the person he designated predeceases the Participant, the
Participant's Beneficiary under the Retirement Plan shall be his Supplemental
Plan Beneficiary as to Part A Supplemental Death Benefits and his Beneficiary
under the Investment Plan shall be his Supplemental Plan Beneficiary as to
Part B Supplemental Death Benefits.


5.3.  FUNDING.  Benefits payable under this Plan to a Participant or his
Supplemental Plan Beneficiary shall be paid directly by the Employers from
their general assets in such proportions as the Company shall determine to the
extent such benefits are not paid from a Special Retirement Account
(established pursuant to Supplement A of this Plan) or from a so-called "rabbi
trust", an irrevocable grantor trust the assets of which are subject to the
claims of creditors of the Employers in the event of their insolvency.  The
Employers shall not be required to segregate on their books or otherwise any
amount to be used for the payment of benefits under this Plan, except as to
any amounts paid or payable to a Special Retirement Account under Supplement A
of this Plan or to a "rabbi trust".

                                      -17-

<PAGE>


                                 SECTION 6

                            GENERAL PROVISIONS


6.1.  STATEMENT OF ACCOUNTS.  The Committee shall furnish each Participant
with a statement of his accounts under this Plan as of each December 31.


6.2.  EMPLOYMENT RIGHTS.  Establishment of the Plan shall not be construed
to give any Participant the right to be retained in the employ of the Company
or any other Employer or to any benefits not specifically provided by this
Plan.


6.3.  INTERESTS NOT TRANSFERABLE.  Except as to withholding of any tax under
the laws of the United States or any state or municipality, the interests of
Participants and their Supplemental Plan Beneficiaries under the Plan are not
subject to the claims of their creditors and may not be voluntarily or
involuntarily transferred, assigned, alienated or encumbered.


6.4.  CONTROLLING LAW.  The laws of Illinois shall be controlling in all
matters relating to the Plan.


6.5.  GENDER AND NUMBER.  Where the context admits, words in the masculine
gender shall include the feminine and neuter genders, the plural shall include
the singular and the singular shall include the plural.


6.6.  ACTION BY THE COMPANY.  Any action required of or permitted by the
Company under the Plan shall be by resolution of its Board of Directors or by
a duly authorized committee of its Board of Directors, or by a person or
persons authorized by resolution of its Board of Directors or such committee.


6.7.  SUCCESSOR TO THE COMPANY OR ANY OTHER EMPLOYER.  The term "Company" as
used in the Plan shall include any successor to the Company by reason of
merger, consolidation, the purchase or transfer of all or substantially all of
the Company's assets, or otherwise.  The term "Employer" as used in the Plan
with respect to the Company or any subsidiary shall include any successor to
that corporation by reason of merger, consolidation, the purchase or transfer
of all or substantially all of the assets of that corporation, or otherwise.

                                      -18-

<PAGE>


6.8.  FACILITY OF PAYMENT.  Any amounts payable hereunder to any person
under a legal disability or who, in the judgment of the Committee, is unable
to properly manage his affairs may be paid to the legal representative of such
person or may be applied for the benefit of such person in any manner which
the Committee may select.  Any payment made in accordance with the next
preceding sentence shall be a full and complete discharge of any liability for
such payment under the Plan.

                                      -19-

<PAGE>


                                 SECTION 7

                         AMENDMENT AND TERMINATION


While the Employers expect to continue the Plan, the Company must necessarily
reserve and reserves the right to amend the Plan from time to time or to
terminate the Plan at any time.  However, no amendment of the Plan nor the
termination of the Plan may cause the reduction or cessation of any benefits
that, but for such amendment or termination, are payable under this Plan or
would become payable under this Plan after the date such amendment is made or
the termination of the Plan occurs with respect to benefits accrued under the
Retirement Plan and all other USG Defined Benefit Plans prior to such date,
and with respect to Participants' before-tax contributions made under this
Plan prior to such date and Employer Matching Contributions attributable to
such before-tax contributions.

                                      -20-

<PAGE>


                               SUPPLEMENT A
                                    TO
               USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN



A-1.  PURPOSE, SPECIAL RETIREMENT ACCOUNT.  The purpose of this Supplement A
is to provide for installment payments of part or all of the accrued benefits
under Part A of the Plan of each Eligible Participant to an individual account
(the "Special Retirement Account") the Participant establishes in his name
with a bank or trust company designated by the Company pursuant to an
agreement between the Participant and the Company (the "Special Retirement
Agreement").


A-2.  ELIGIBLE PARTICIPANT.  The term "Eligible Participant" as used in this
Supplement A means a Participant in Part A of the Plan who had established a
Special Retirement Account on or before May 1, 1993.  No Participant may
establish a Special Retirement Account after May 1, 1993.


A-3.  ACCRUED BENEFIT AND DEATH BENEFIT VALUES, AFTER-TAX ACCRUED BENEFIT AND
DEATH BENEFIT VALUES.  The following terms used in this Supplement A shall
have the following meanings:

      (a)   "Accrued Benefit Value" as of any date means the present value of
            an Eligible Participant's Part A Supplemental Benefits under the
            Plan as of that date, as determined by the Committee (calculated
            on the bases of the actuarial factors, assumptions and tables then
            applied for that purpose under the Retirement Plan and benefit
            limitations imposed by the Internal Revenue Code then in effect,
            and assuming that no payments have been made to the Eligible
            Participant's Special Retirement Account pursuant to Paragraph A-5
            and that the Eligible Participant will not have any additional
            service or employment compensation).

      (b)   "After-Tax Accrued Benefit Value" as of any date means an Eligible
            Participant's Accrued Benefit Value as of that date less
            Applicable Income Taxes.

      (c)   "Accrued Death Benefit Value" means, in the case of an Eligible
            Participant whose death occurs prior to receipt of any portion of
            the Participant's Part A Supplemental Benefits, the present

                                      A-1

<PAGE>


            value as of the date of the Eligible Participant's death, as
            determined by the Committee, of the Part A Supplemental Death
            Benefits, if any, payable to the Eligible Participant's Eligible
            Spouse as of that date (calculated on the basis of the actuarial
            factors, assumptions and tables then applied under the Retirement
            Plan in determining the present value of accrued death benefits
            and benefit limitations imposed by the Internal Revenue Code then
            in effect, and assuming that no payments have been made to the
            Eligible Participant's Special Retirement Account).

      (d)   "After-Tax Accrued Death Benefit Value" means, in the case of an
            Eligible Participant described in the next preceding sentence, the
            Accrued Death Benefit Value as of the date of the Eligible
            Participant's death less Applicable Income Taxes.


A-4.  APPLICABLE INCOME TAXES.  "Applicable Income Taxes" means, with
respect to any amount, federal, state and local income taxes on such amount
(using for this purpose, and subject to such rules as the Committee may
establish, the highest published applicable individual income tax rate in
effect for the calendar year as to which such taxes are being determined),
provided that state and local income taxes shall be considered net of federal
income tax benefits.


A-5.  PAYMENTS TO THE SPECIAL RETIREMENT ACCOUNT.  Subject to the provisions
of Paragraph A-6, the following payments will be made to the Special
Retirement Account of each Eligible Participant.  As of the beginning of each
calendar quarter, the Committee shall determine the Employee's After-Tax
Accrued Benefit Value as well as the amount, if any, by which such value
exceeds the fair market value of all assets of the Special Retirement Account
as of the end of the preceding calendar quarter.  If Employee's After-Tax
Accrued Benefit Value exceeds the fair market value of such assets by $100,000
or more, a payment will be made to the Special Retirement Account equal to the
difference between such values.  Payments required to be made to the Special
Retirement Account under this Paragraph A-5 shall be made directly by the
Company or from USG Corporation Deferred Benefit Trust, or from both sources,
as soon as practicable after the amounts of the payments have been determined
by the Committee.  Pursuant to the terms of the Special Retirement Agreement,
the Company will gross-up the amount of a payment made to the Special
Retirement Account under this Paragraph A-5 so as to provide funds for the

                                      A-2

<PAGE>


Applicable Income Taxes payable by the Eligible Participant on such payment
and will make payments to (or with respect to) the Eligible Participant in
order to provide funds for the Applicable Income Taxes payable on investment
income earned by the Special Retirement Account.


A-6.  ADJUSTMENT OF PART A SUPPLEMENTAL BENEFITS AND PART A SUPPLEMENTAL
DEATH BENEFITS UPON RETIREMENT OR DEATH.  For the purpose of determining the
amount of payments to be made to an Eligible Participant's Special Retirement
Account pursuant to Paragraph A-5, it is assumed that no portion of the Part A
Supplemental Benefits he has accrued has been paid under the Plan.  However,
each payment made to an Eligible Participant's Special Retirement Account
shall reduce the obligation of the Plan to provide Part A Supplemental
Benefits and Part A Supplemental Death Benefits to or with respect to that
Eligible Participant and thus benefits otherwise payable under the Plan shall
be reduced to reflect such payments.  Upon an Eligible Participant's
retirement or death before retirement, the following shall apply:

      (a)   No further payments need be made under the Plan to the Eligible
            Participant's Special Retirement Account.

      (b)   The Committee shall determine the amount of Part A Supplemental
            Benefits or Part A Supplemental Death Benefits that would be
            payable under the Plan as a result of such retirement or death if
            no payments had been made to the Eligible Participant's Special
            Retirement Account and also shall determine the After-Tax Accrued
            Benefit Value or After-Tax Accrued Death Benefit Value, as the
            case may be, of those benefits.

      (c)   The benefits determined under subparagraph (b) next above shall be
            reduced so that their After-Tax Accrued Benefit Value or After-Tax
            Accrued Death Benefit Value equals the amount by which the
            After-Tax Accrued Benefit Value or After-Tax Accrued Death Benefit
            Value, determined in accordance with subparagraph (b) next above,
            exceeds the fair market value of all assets of the Eligible
            Participant's Special Retirement Account as of the date of his
            retirement or death, disregarding assets of the Special Retirement
            Account, if any, that are required to be paid to the Company.
            Subject to the provisions of subparagraph (d) next below, the
            resulting benefits shall be the actual Part A Supplemental
            Benefits

                                      A-3

<PAGE>


            or Part A Supplemental Death Benefits that will be paid under the
            Plan to, or with respect to, the Eligible Participant.

      (d)   Subparagraph 3.7(b) of the Plan provides for the payment of Part A
            Supplemental Death Benefits to the Eligible Spouse of an Eligible
            Participant who dies after retirement but before payment of any
            portion of the Eligible Participant's Part A Supplemental Benefits
            had been made or commenced.  However, if an Eligible Participant
            retires but dies before all assets in the Eligible Participant's
            Special Retirement Account not in excess of the Eligible
            Participant's After-Tax Accrued Benefit Value have been
            distributed to him, the Special Retirement Agreement requires that
            the undistributed portion of such assets be distributed as soon as
            practicable after the Eligible Participant's death to the Eligible
            Participant's Beneficiary under the Special Retirement Agreement.
            In this case, Part A Supplemental Death Benefits shall be payable
            under subparagraph 3.7(b) of the Plan to the Eligible Spouse of
            the Eligible Participant only to the extent, if any, the fair
            market value of the assets distributed from the Special Retirement
            Account to the Eligible Participant after his retirement and the
            assets distributed or to be distributed from the Special
            Retirement Account to such Beneficiary is less than the After-Tax
            Accrued Death Benefit Value of the Part A Supplemental Death
            Benefits otherwise payable to the Eligible Spouse under Part A of
            the Plan.

      (e)   The actual Part A Supplemental Benefits or Part A Supplemental
            Death Benefits determined under subparagraphs (c) and (d) next
            above shall be paid as provided in subsection 3.6 or 3.7 of the
            Plan, whichever applies.

      (f)   If the fair market value of all assets in the Eligible
            Participant's Special Retirement Account as of the date of his
            retirement or death exceeds the After-Tax Accrued Benefit Value or
            the After-Tax Accrued Death Benefit Value, whichever applies, the
            Special Retirement Agreement provides that such excess assets
            shall be returned to the Company.

                                      A-4

<PAGE>


A-7.  TERMS AND PROVISIONS OF THE PLAN.  All the terms and provisions of the
Plan shall apply to this Supplement A and vice versa, except that where and to
the extent the terms and provisions of the Plan and this Supplement A
conflict, the terms and provisions of this Supplement A shall govern.

                                      A-5



<PAGE>


                                                                 EXHIBIT 10(e)


                              FIRST AMENDMENT
                                    OF
               USG CORPORATION SUPPLEMENTAL RETIREMENT PLAN

           (As Amended and Restated Effective as of July 1, 1993)


            WHEREAS, USG Corporation maintains the USG Corporation
Supplemental Retirement Plan (the "plan"), which plan was amended and restated
in its entirety effective as of July 1, 1993; and

            WHEREAS, it is now considered desirable to amend the plan;

            NOW, THEREFORE, pursuant to the amending power reserved to the
Corporation as the "Company" under Section 7 of the plan, as amended, the plan
be and it hereby is further amended, effective as of November 15, 1993, by
substituting the following two paragraphs for subparagraphs 3.7(a) and (b) of
the plan:

            "(a)  If a Participant's death occurs while employed by the
                  Company or a subsidiary of the Company and if he had an
                  Eligible Spouse (as defined in subsection 5.1) immediately
                  prior to his death, the Participant's Eligible Spouse shall
                  be entitled to a lump sum Part A Supplemental Death Benefit
                  under this Plan which is actuarially equivalent to any
                  additional monthly pre-retirement survivor annuity benefits
                  that would have been payable to the Participant's Eligible
                  Spouse under the Retirement Plan and all other USG Defined
                  Benefit Plans if the Participant's Limited Benefits equalled
                  his Unlimited Benefits.  The Part A Supplemental Death
                  Benefit under this subparagraph 3.7(a) shall be paid to the
                  Participant's Eligible Spouse in a lump sum as soon as
                  practicable after the Participant's Death.  If the
                  Participant did not have an Eligible Spouse at the time of
                  his death, no Part A Supplemental Death Benefits shall be
                  payable under the Plan with respect to that Participant
                  other than payment to the Participant's Supplemental Plan
                  Beneficiary (as defined in subsection 5.2) of an amount
                  equal to the Participant's before-tax contributions under
                  the


<PAGE>


                  Plan with interest as soon as practicable after the
                  Participant's death.

            (b)   If a Participant's death occurs after he had both retired
                  (or otherwise terminated employment) and become entitled to
                  Part A Supplemental Benefits but before payment of such
                  benefits had been made or had commenced, and if he had an
                  Eligible Spouse at the time of his death, the Participant's
                  Eligible Spouse shall be entitled to a lump sum Part A
                  Supplemental Death Benefit which is actuarially equivalent
                  to any additional monthly pre-retirement survivor annuity
                  benefits that could have been payable to the Participant's
                  Eligible Spouse under the Retirement Plan and all other USG
                  Defined Benefit Plans if the Participant's Limited Benefits
                  equalled his Unlimited Benefits.  The Part A Supplemental
                  Death Benefit under this subparagraph 3.7(b) shall be paid
                  to the Participant's Eligible Spouse in a lump sum as soon
                  as practicable after the Participant's Death.  If the
                  Participant did not have an Eligible Spouse at the time of
                  his death, no Part A Supplemental Death Benefits shall be
                  payable under the Plan with respect to that Participant
                  other than payment to the Participant's Supplemental Plan
                  Beneficiary of an amount equal to the Participant's
                  before-tax contributions under this Plan with interest as
                  soon as practicable after the Participant's death."


            IN WITNESS WHEREOF, the company has caused these presents to be
signed on its behalf by an officer thereunto duly authorized this 2nd day of
December, 1993.


                                    USG CORPORATION




                                    By ______________________________
                                        Senior Vice President and
                                       Chief Administrative Officer


                                            2


<PAGE>


                                                                EXHIBIT 10(ak)




                              FIFTH AMENDMENT
                                    OF
                     USG CORPORATION INVESTMENT TRUST



WHEREAS, USG Corporation Investment Trust (the "trust") serves as the funding
vehicle for USG Corporation Investment Plan; and


WHEREAS, the trust has been amended from time to time, and further amendment
of the trust now is considered desirable;


NOW, THEREFORE, pursuant to the amending power reserved to USG Corporation
(the "company") under paragraph XI-1 of the trust, as amended, the trust is
further amended, effective July 1, 1993, in the following particulars:


1.  By substituting the following for subparagraph III-2(c) of the trust:

      "(c)   To direct the trustee from time to time to buy or sell company
             shares as described in paragraph VI-1, to transfer assets
             specified by the committee to or from any investment fund
             described in Article VI, or to transfer assets to a deposit
             account or a deposit administration fund maintained by a legal
             reserve life insurance company pursuant to an agreement between
             the trustee and such insurance company or a group annuity
             contract issued by such insurance company to the trustee as
             contractholder, and for this purpose to direct the trustee to
             execute such agreement or apply for such group annuity contract."


2.  By substituting the following for paragraph IV-1 of the trust:

      "IV-1.  THE TRUST FUND.  Unless the context clearly implies or
      indicates the contrary, the term 'trust fund' comprises all property of
      every kind held or acquired by the trustee under this agreement."





                                     1

<PAGE>


3.  By substituting the following for subparagraph IV-2(c)(i) of the trust:

      "(i)   when directed by an investment manager pursuant to paragraph
             VI-2, VI-3, VI-4, VI-5, VI-6 or VI-7, the trustee shall acquire,
             retain and dispose of such investments as that investment manager
             from time to time may direct;"


4.  By renumbering subparagraph IV-2(c)(ii) of the trust as subparagraph
IV-2(c)(iii) and inserting the following new subparagraph IV-2(c)(ii):

      "(ii)  when directed by the committee pursuant to paragraph VI-4, VI-5,
             VI-6 or VI-7, the trustee shall acquire, retain or dispose of
             units of one or more investment companies registered under the
             Investment Company Act of 1940 (an 'investment company') and/or
             one or more common, collective or commingled trust funds or
             pooled investment funds qualified under Section 401(a) of the
             Internal Revenue Code;"


5.  By substituting the following for subparagraph IV-2(d) of the trust:

      "(d)   When directed by the committee pursuant to subparagraph III-2(c),
             to buy or sell company shares, to transfer assets specified by
             the committee to or from any investment fund described in Article
             VI, and when directed by the committee pursuant to subparagraph
             III-2(d), to receive and hold any assets transferred from, or to
             purchase assets from, or to transfer or sell any assets of this
             trust to, the company or a subsidiary of the company, or any
             other profit sharing, stock bonus or pension trust maintained by
             the company or any subsidiary of the company that meets the
             requirements of a 'qualified trust' under Section 401(a) of the
             Internal Revenue Code (provided that any such purchase or sale to
             another qualified trust or to the company or a subsidiary of the
             company satisfies the prohibited transaction exemption
             requirements set forth in Section 408(e) of the Employee
             Retirement Income Security Act of 1974, as amended)."





                                     2

<PAGE>


6.  By substituting the following for subparagraph IV-2(n) of the trust:

      "(n)   To determine and report to the committee as of the end of each
             calendar quarter, and at such other times as may be required
             under the plan, the then net worth of the trust fund and the fair
             market value of company shares and of each investment fund
             described in Article VI, all as determined by the trustee on an
             accrual basis pursuant to such evidence, data and information as
             it considers pertinent and reliable."


7.  By redesignating subparagraph IV-2(p) of the trust as subparagraph IV-2(q)
and by inserting the following new subparagraph IV-2(p):

      "(p)   When directed by the committee, to transfer an eligible rollover
             distribution described in Section 402(c)(4) of the Internal
             Revenue Code directly to an eligible retirement plan described in
             Section 402(c)(8)(B) of the Internal Revenue Code."


8.  By substituting the following for the first sentence of paragraph V-1 of
the trust:

      "The committee, at its sole discretion, may appoint a professional
      investment counsel other than the trustee as 'investment manager' of any
      investment fund (the 'fund') established pursuant to Article VI, but not
      with respect to investments in company shares as described in paragraph
      VI-1."


9.  By substituting the following for paragraph VI-1 of the trust:

      "VI-1.  COMPANY SHARES.  When directed by the committee pursuant to
      subparagraph III-2(c), the trustee shall purchase and sell shares of
      common stock of the company which constitute qualifying employer
      securities, as defined in Section 407(d)(5) of the Employee Retirement
      Income Security Act of 1974, as amended ('company shares').  To the
      extent not purchased from stock accounts maintained under the plan,
      company shares shall be purchased by the trustee on the open market, or
      upon the direction of the committee, from the company or a subsidiary of





                                     3

<PAGE>


      the company or from any other qualified defined contribution or
      qualified defined benefit plan maintained by the company or a subsidiary
      of the company (provided that any such purchases from the company or a
      subsidiary of the company or from another qualified plan satisfy the
      prohibited transaction exemption requirements set forth in Section 408(e)
      of the Employee Retirement Income Security Act of 1974, as amended).  In
      order to fully invest contributions paid to stock accounts under the
      plan, the trustee may borrow from any source permitted by law funds
      needed to purchase a whole number of shares.  If for any reason the
      trustee is unable to invest contributions in company shares when such
      contributions are received by the trustee, then, in the interim, the
      trustee may invest such contributions in one or more common, collective
      or commingled trust funds that are maintained by the bank or trust
      company acting as trustee and that have been determined to meet the
      requirements of Section 401(a) of the Internal Revenue Code.
      Notwithstanding the foregoing provisions of this paragraph and any other
      provisions of this agreement to the contrary, during the 'suspension
      period' which began January 1, 1992 and ended June 30, 1993, the trustee
      was not permitted to purchase company shares from any source.  Beginning
      July 1, 1993, the trustee again may purchase company shares with
      participants' contributions, pursuant to their elections made under the
      plan.  Effective with the calendar quarter beginning October 1, 1993,
      the trustee may purchase company shares with amounts transferred,
      pursuant to participants' elections made under the plan, from any of the
      investment funds."


10.  By substituting the following sentence for the first sentence of
paragraph VI-2 of the trust:

      "The trustee maintains an investment fund known as the 'fixed income
      fund.'"


11.  By substituting the following sentence for the first sentence of
paragraph VI-3 of the trust:

      "The trustee maintains an investment fund known as the 'government
      investment fund.'"




                                     4
<PAGE>


12.  By substituting the following new paragraphs VI-4, VI-5, VI-6, and VI-7
for paragraphs VI-4, VI-5, and VI-6 of the trust:

      "VI-4.  BALANCED FUND.  The trustee maintains a separate fund known as
      the 'balanced fund.'  Assets of the balanced fund may be invested in (i)
      several broadly diversified asset classes, which may include, but are
      not limited to, domestic common stocks, preferred stocks, bonds and
      cash, and also may include foreign common stocks and bonds and (ii)
      units of one or more investment companies and/or one or more common,
      collective or commingled trust funds or pooled investment funds that are
      qualified under Section 401(a) of the Internal Revenue Code, provided
      such investment companies or funds are invested in several broadly
      diversified asset classes, including, but not limited to, those
      described in (i) next above.  Participants' contributions shall be
      invested by the trustee in the balanced fund as soon as practicable
      after they are received by the trustee but in the interim may be
      invested by the trustee in one or more common, commingled or collective
      trust funds that are maintained by the bank or trust company acting as
      trustee and that have been determined to meet the requirements of
      Section 401(a) of the Internal Revenue Code.  The committee may
      designate an investment manager for the balanced fund pursuant to
      paragraph V-1, except that, at the committee's discretion, such
      designation may apply only to a portion of the assets of the balanced
      fund so that such investment manager shall have investment
      responsibility only as to that portion of the balanced fund for which it
      is acting as investment manager.  The trustee shall have investment
      responsibility as to all assets of the balanced fund for which an
      investment manager does not have investment responsibility or which are
      not invested at the direction of the committee pursuant to paragraph
      IV-2(c)(ii) in units of an investment company, a common, collective or
      commingled trust fund, or a pooled investment fund.  Earnings of the
      balanced fund shall be retained in that fund and reinvested as a part
      thereof.

      VI-5.  EQUITY INDEX FUND.  The trustee maintains an investment fund
      known as the 'equity index fund.'  The equity index fund is invested so
      as to provide a broadly diversified equity portfolio, the performance of
      which will closely track the return of the Standard & Poor's Composite
      500 Index.  Accordingly, assets of the equity index fund may be invested
      in,



                                     5
<PAGE>


      but are not limited to, common or capital stocks, stock index future
      contracts traded on a regulated exchange, bonds, debentures or preferred
      stocks that are convertible into common stock, and units of one or more
      investment companies and/or one or more common, commingled or collective
      trust funds or pooled investment funds that are qualified under Section
      401(a) of the Internal Revenue Code, provided such investment companies
      or funds are invested so as to closely track the return of the Standard
      & Poor's Composite 500 Index.  Participants' contributions shall be
      invested by the trustee in the equity index fund as soon as practicable
      after they are received by the trustee but in the interim may be
      invested by the trustee in one or more common, commingled or collective
      trust funds that are maintained by the bank or trust company acting as
      trustee and that have been determined to meet the requirements of
      Section 401(a) of the Internal Revenue Code.  The committee may
      designate an investment manager for the equity index fund pursuant to
      paragraph V-1, except that, at the committee's discretion, such
      designation may apply only to a portion of the assets of the equity
      index fund so that such investment manager shall have investment
      responsibility only as to that portion of the equity index fund for
      which it is acting as investment manager.  The trustee shall have
      investment responsibility as to all assets of the equity index fund for
      which an investment manager does not have investment responsibility or
      which are not invested at the direction of the committee pursuant to
      paragraph IV-2(c)(ii) in units of an investment company, a common,
      collective or commingled trust fund, or a pooled investment fund.
      Earnings of the equity index fund shall be retained in that fund and
      reinvested as a part thereof.

      VI-6.  GROWTH FUND.  The trustee maintains a separate fund known as
      the 'growth fund.'  Assets of the growth fund are invested (i) primarily
      in equity securities of large market capitalization companies with
      earnings that are expected to grow at an above-average rate, but may be
      further diversified by investment of a small variable portion of the
      assets in domestic bonds, foreign common stocks and bonds, and cash
      and/or (ii) in units of one or more investment companies and/or one or
      more common, collective or commingled trust funds or pooled investment
      funds that are qualified under Section 401(a) of the Internal Revenue
      Code, provided such investment companies or funds are invested as
      described in (i) next above.



                                     6
<PAGE>


      Participants' contributions shall be invested by the trustee in the
      growth fund as soon as practicable after they are received by the
      trustee but in the interim may be invested by the trustee in one or more
      common, commingled or collective trust funds that are maintained by the
      bank or trust company acting as trustee and that have been determined to
      meet the requirements of Section 401(a) of the Internal Revenue Code.
      The committee may designate an investment manager for the growth fund
      pursuant to paragraph V-1, except that, at the committee's discretion,
      such designation may apply only to a portion of the assets of the growth
      fund so that such investment manager shall have investment
      responsibility only as to that portion of the growth fund for which it
      is acting as investment manager.  The trustee shall have investment
      responsibility as to all assets of the growth fund for which an
      investment manager does not have investment responsibility or which are
      not invested at the direction of the committee pursuant to paragraph
      IV-2(c)(ii) in units of an investment company, a common, collective or
      commingled trust fund, or a pooled investment fund.  Earnings with
      respect to the growth fund shall be retained in that fund and reinvested
      as a part thereof.

      VI-7.  ADDITIONAL INVESTMENT FUNDS.  The committee from time to time
      may direct the trustee to establish one or more additional investment
      funds or to establish an investment fund to replace an existing
      investment fund described in this Article VI (but not to replace
      investments in company shares), and the committee may direct the trustee
      to transfer assets specified by the committee from another investment
      fund to such additional or replacement investment fund.  Investment of
      the assets held in any such investment fund shall be made pursuant to
      investment guidelines formulated by the committee and shall be the
      responsibility of the trustee to the extent the committee has not
      appointed an investment manager for that fund or has not directed the
      investment of that fund in units of one or more investment companies
      and/or of one or more common, collective or commingled trust funds or
      pooled investment funds that are qualified under Section 401(a) of the
      Internal




                                     7
<PAGE>


      Revenue Code.  Any dividends, interest or other income generated by
      investment of any assets of such an investment fund shall be credited to
      that fund."


IN WITNESS WHEREOF, the company has caused these presents to be signed by an
officer thereunto duly authorized this 30th day of July, 1993.


                                    USG CORPORATION


                                    By ______________________________
                                         Senior Vice President and
                                        Chief Administrative Officer



The undersigned, as trustee under USG Corporation Investment Trust, hereby
acknowledges receipt of an executed copy of the foregoing amendment of the
trust and hereby consents thereto to the extent it applies to the undersigned
as trustee, this ______ day of _____________, 1993.


                                    THE NORTHERN TRUST COMPANY,
                                    as Trustee as Aforesaid


                                    By ______________________________
                                       Its __________________________






                                     8

<PAGE>


                                                                 EXHIBIT 10(al)




                              SIXTH AMENDMENT
                                    OF
                      USG CORPORATION INVESTMENT PLAN



WHEREAS, USG CORPORATION (the "company") maintains USG Corporation Investment
Plan (the "plan"); and


WHEREAS, the plan has been amended from time to time, including an amendment
and restatement of the plan effective as of January 1, 1989 and five
subsequent amendments, and further amendment of the plan now is considered
desirable;


NOW, THEREFORE, pursuant to the amending power reserved to the company under
subsection 15.1 of the plan, as amended, the plan be and is further amended in
the following particulars:


1.  By substituting the parenthetical phrase "(or he would be accruing
benefits but for a minimum age provision set forth in that plan, if any)" for
the parenthetical phrase "(or he would be accruing benefits but for a maximum
or minimum age provision set forth in that plan, if any)" where the latter
appears in subparagraph 2.1(c)(i) of the plan.


2.  By substituting the following for the last sentence of subsection 3.2 of
the plan:

      "Corporate matching contributions shall be made under the plan for a
      plan year beginning after December 31, 1992 with respect to participants
      basic contributions during that year to the extent provided by the
      corporation matching contribution provisions set forth in subsection
      4.2."


3.  By substituting the following for subsections 4.2 and 4.3 of the plan:

      "4.2.  CORPORATION MATCHING CONTRIBUTIONS.  Subject to the conditions
      and limitations of this Section 4 and Sections 7 and 15, the employers
      will make 'corporation matching contributions' with respect to eligible
      participants (as defined in subsection 6.4) in the form of 'formula
      matching contributions' and

                                      -1-

<PAGE>


      'quarterly matching contributions' as determined under subparagraphs (a)
      and (b) below:

      (a)   FORMULA MATCHING CONTRIBUTIONS.  For each plan year commencing
            after December 31, 1992 the employers will make formula matching
            contributions only if at least 80 percent of the Consolidated
            Earnings Goal of the USG Companies for that plan year has been
            met.  The level of formula matching contributions is to be
            determined on the basis of the table set forth in Exhibit I to the
            plan.  The 'Consolidated Earnings Goal' for any plan year is based
            upon consolidated earnings of the USG Companies from all domestic
            and foreign continuing operations before net interest expense,
            asset sales, taxes, and depreciation, depletion, amortization, and
            other non-cash charges, with the amount of the Consolidated
            Earnings Goal for any plan year determined by the chief financial
            officer of the company and filed in writing with the committee by
            July 31, 1993 in the case of the 1993 plan year and by the end of
            the first calendar quarter in the case of each subsequent plan
            year.

      (b)   QUARTERLY MATCHING CONTRIBUTIONS.  For each calendar quarter
            commencing after December 31, 1993 the employers will make
            quarterly matching contributions in an amount equal to 25 percent
            of each eligible participant's basic contributions made during
            that calendar quarter not in excess of 4 percent of his earnings
            for that calendar quarter.

      4.3.  INDIVIDUAL EMPLOYER'S SHARE OF CORPORATION MATCHING
      CONTRIBUTIONS.  Subject to the limitations set forth in subsection 4.4,
      each employer's share of the corporation matching contributions to be
      made under the plan for any period pursuant to subsection 4.2 shall be
      determined as follows:

      (a)   the amount of the corporation matching contributions under the
            plan determined in accordance with subsection 4.2 shall be reduced
            by 'remainders' that have arisen under the plan to the extent such
            remainders have not been otherwise applied pursuant to subsection
            10.9; and

      (b)   the employer's share shall be that proportion of the net amount
            determined under subparagraph (a)

                                      -2-

<PAGE>


            above which the corporation matching contributions (determined in
            accordance with subsection 4.2) to be allocated to participants
            employed by the employer bear to the total corporation matching
            contributions (determined in accordance with subsection 4.2) to be
            allocated to all participants.

      Each employer's share of the formula matching contributions to be made
      under the plan for any plan year pursuant to subparagraph 4.2(a) shall
      be paid to the trustee, without interest, not later than the time
      required for the filing of the company's federal income tax return for
      its taxable year beginning within that plan year, including any
      extensions of time thereof.  Each employer's share of the quarterly
      matching contributions to be made under the plan for any quarter
      pursuant to subparagraph 4.2(b) shall be paid to the trustee, without
      interest, as soon as practicable after the amount of such share is
      determined."


4.  By substituting the following for subsection 5.3 of the plan:

      "5.3.  PRIMARY INVESTMENT OF PARTICIPANT BASIC CONTRIBUTIONS.  The
      basic contributions made by a participant under the plan after June 30,
      1993 shall be invested by the trustee pursuant to the participant's
      election on a form provided for that purpose by the committee in one or
      more of the following forms of investment, in 5 percent increments:

      (a)   Common stock of the company ('company shares') described in
            subsection 5.6.

      (b)   The fixed income fund described in subsection 5.7.

      (c)   The government investment fund described in subsection 5.8.

      (d)   The balanced fund described in subsection 5.9.

      (e)   The equity index fund described in subsection 5.10.

      (f)   The growth fund described in subsection 5.11.

                                      -3-

<PAGE>


       (g)  Any other investment fund described in subsection 5.12.

      Investments under any of the funds ('investment funds') described in
      subparagraphs (b) through (g) above may, to the extent permitted under
      the trust agreement, be made in the form of units in one or more
      investment companies registered under the Investment Company Act of 1940
      or common, collective or commingled trust funds or pooled investment
      funds qualified under Section 401(a) of the Internal Revenue Code."


5.  By substituting the following for subparagraphs (a), (b) and (c) of
subsection 5.4 of the plan:

      "(a)  In the case of a participant in the plan on June 30, 1993, his
            basic contributions made after June 30, 1993 and his participant
            accounts on that date shall continue to be invested in the same
            manner as during the calendar quarter ended June 30, 1993 until
            the participant makes an investment change election under
            subparagraph (b) or (c) of this subsection 5.4 which is effective
            for the calendar quarter beginning July 1, 1993 or in a subsequent
            calendar quarter.

      (b)   At least fifteen days (or such lesser number of days specified by
            the committee) before the end of any calendar quarter a
            participant may elect to change his investment election as to any
            contributions he makes under the plan after the end of that
            calendar quarter so that they may be invested in 5 percent
            increments in one or more of the forms of investment described in
            subsection 5.3.

      (c)   At least fifteen days before the end of any calendar quarter a
            participant may elect that 100 percent of the assets in all of his
            participant accounts be converted to cash and invested in 5
            percent increments in one or more of the forms of investments
            described in subsection 5.3.  Notwithstanding the foregoing to the
            contrary, a participant's elections under this subparagraph (c)
            for the calendar quarter beginning on July 1, 1993 must be in
            increments of 25% of the assets in all of his participant
            accounts, and elections to invest part or all of

                                      -4-

<PAGE>


            his existing accounts in the balanced fund, growth fund or in
            company shares shall not be effective before the calendar quarter
            beginning October 1, 1993."


6.  By substituting the following for the second sentence of subsection 5.5 of
the plan:

      "As of the end of each calendar quarter the trustee shall separately
      determine the earnings resulting from short-term investments during the
      calendar quarter with respect to participant contributions required to
      be invested in company shares, and participant contributions required to
      be invested in any other investment fund, respectively, as provided in
      the trust agreement, and such earnings shall be reflected in participant
      accounts as provided in subsection 5.13."


7.  By substituting the following for the last two sentences of subsection 5.6
of the plan:

      "Notwithstanding the foregoing provisions of this subsection and any
      other provisions of the plan to the contrary, during the 'suspension
      period' which began January 1, 1992 and ended June 30, 1993, the trustee
      was not permitted to purchase company shares from any source for
      participants' accounts.  Beginning July 1, 1993, participants again may
      make elections under subsection 5.3 and subparagraph 5.4(b) to have
      their future basic contributions invested in company shares in
      accordance with the provisions of this subsection 5.6, but elections
      under subsection 5.4(c) and subsection 6.2 to have proceeds from any
      part or all of their existing participant and corporation accounts
      invested in company shares shall not be effective before the calendar
      quarter beginning October 1, 1993."


8.  By renumbering subsection 5.9 of the plan as subsection 5.10 and inserting
the following new subsection 5.9:

      "5.9.  BALANCED FUND.  The trustee maintains a separate fund known as
      the 'balanced fund.'  This fund is invested in several broadly
      diversified asset classes, which may include, but are not limited to,
      domestic common stocks, preferred stocks, bonds and cash, and also may
      include foreign common stocks and bonds.  New investments shall be made
      by the trustee

                                      -5-

<PAGE>


      in the balanced fund with participants' contributions as soon as
      practicable after they are received by the trustee, but in the interim
      may be invested by the trustee as provided in subsection 5.5.  Earnings
      with respect to the balanced fund shall be retained in that fund and
      reinvested as a part thereof."


9.  By renumbering subsection 5.10 of the plan as subsection 5.12 and
inserting the following new subsection 5.11:

      "5.11.  GROWTH FUND.  The trustee maintains a separate fund known as
      the 'growth fund.'  This fund is invested primarily in equity securities
      of large market capitalization companies with earnings that are expected
      to grow at an above-average rate, but may be further diversified by
      investment of a small variable portion of the assets in domestic bonds,
      foreign common stocks and bonds, and cash.  New investments shall be
      made by the trustee in the growth fund with participants' contributions
      as soon as practicable after they are received by the trustee, but in
      the interim may be invested by the trustee as provided in subsection
      5.5.  Earnings with respect to the growth fund shall be retained in that
      fund and reinvested as a part thereof."


10.  By deleting subsection 5.14 and by renumbering subsections 5.11, 5.12
and 5.13 as subsections 5.13, 5.14 and 5.15, respectively.


11.  By substituting the following for subsection 6.1 of the plan:

      "6.1.  CORPORATION ACCOUNTS.  In addition to the accounts described in
      subsection 5.1, the committee will maintain one or more accounts in the
      name of each participant to reflect the participant's share of
      corporation matching contributions pursuant to subsection 4.2 and
      income, losses, appreciation and depreciation attributable thereto, and
      corresponding subaccounts to reflect the participant's interest in the
      fixed income fund or other investment funds pursuant to the
      participant's investment election under subsection 6.2, including a
      'corporation cash account' and a 'corporation stock account,' as
      appropriate.  All such accounts are referred to as 'corporation
      accounts.'"

                                      -6-

<PAGE>


12.  By substituting the following for subsection 6.2 of the plan:

      "6.2.  INVESTMENT OF CORPORATION MATCHING CONTRIBUTIONS.  Corporation
      matching contributions shall be invested as follows:

      (a)   Corporation matching contributions received by the trustee during
            a calendar quarter shall be invested by the trustee in the fixed
            income fund as soon as practicable after they are received by the
            trustee, but beginning with the calendar quarter next following
            the calendar quarter in which such contributions are received by
            the trustee and invested in the fixed income fund, a participant's
            share of such contributions and any earnings thereon resulting
            from the investment of such contributions in the fixed income fund
            shall be subject to investment change elections made by the
            participant in accordance with subparagraph (b) below.

      (b)   Investment change elections may be made by a participant with
            respect to his corporation accounts in the same manner as provided
            under subparagraph 5.4(c) for participant accounts.  A
            participant's investment elections with respect to his corporation
            accounts need not be the same as his investment elections with
            respect to his participant accounts.

      If corporation matching contributions have been made in the form of
      company shares in lieu of cash pursuant to subsection 4.7, such shares
      shall be converted to cash."


13.  By substituting the following for subsection 6.4 of the plan:


      "6.4.  ALLOCATION AND CREDITING OF CORPORATION MATCHING CONTRIBUTIONS.
      Corporation matching contributions shall be allocated to the corporation
      accounts of eligible participants in accordance with the following:

      (a)   Formula matching contributions under subparagraph 4.2(a) will be
            allocated as of the end of each plan year, pro rata, according to
            the basic contributions made by participants, respectively, during
            that plan year.

                                      -7-

<PAGE>


      (b)   Quarterly matching contributions under subparagraph 4.2(b) will be
            allocated as of the end of each calendar quarter, effective with
            the calendar quarter beginning January 1, 1994, pro rata,
            according to basic contributions made by participants,
            respectively, during that calendar quarter which are not in excess
            of 4 percent of their earnings for that calendar quarter.

      The amount to be allocated under this subsection 6.4 for any period
      shall include the total of the individual employer shares of the
      corporation matching contributions made under the plan for that period,
      as determined in accordance with subsection 4.3, and the total
      remainders that have arisen under the plan during that period to the
      extent such remainders have not been otherwise applied pursuant to
      subsection 10.9.  The term 'eligible participants' means participants
      who made basic contributions under the plan during that year in the case
      of formula matching contributions or during that calendar quarter in the
      case of quarterly matching contributions, exclusive of participants
      whose settlement dates occurred (during that year in the case of formula
      matching contributions or during that calendar quarter in the case of
      quarterly matching contributions) under subparagraph 10.1(e) because of
      resignation or dismissal before they qualified for retirement under the
      plan."


14.  By deleting the parenthetical phrase "(including his July 31, 1988
employer accounts, if any)" where it appears in subsections 6.7, 10.2 and 10.3
of the plan.


15.  By deleting subparagraph 7.5(c) from the plan.


16.  By deleting the last sentence of subparagraph 8.2(b) of the plan.


17.  By substituting the following for subparagraph 8.3(c)(i) of the plan:

            "(i)     medical expenses incurred by (or necessary for the
                     medical care of) the participant, the participant's
                     spouse or any dependents of the participant;"

                                      -8-

<PAGE>


18.  By substituting the following for subparagraph 8.3(c)(iii) of the plan:

            "(iii)   payment of tuition for the next twelve months of
                     post-secondary education for the participant or the
                     participant's spouse, children, or dependents; and"


19.  By substituting the phrase "by a nontaxable loan available under the plan
or other distributions or nontaxable loans available from any other plans
maintained by the USG Companies" for the phrase "by other distributions or
nontaxable loans available from any other plans maintained by the USG
Companies," where the latter appears in subparagraph 8.3(d) of the plan.


20.  By substituting the following for subparagraphs 8.5(b) and (c) of the
plan:

      "(b)  Interests in the government investment fund, the fixed income
            fund, the balanced fund, the equity index fund, the growth fund
            and any other fund established pursuant to subsection 5.10 shall
            be converted to cash as of the first day of a calendar quarter
            based upon the adjusted balances in all accounts in that
            investment fund as of the close of the immediately preceding
            calendar quarter.

       (c)  A participant's interests in the government investment fund, fixed
            income fund, balanced fund, equity index fund, growth fund and
            company shares shall be converted to cash in that order to the
            extent necessary to make a withdrawal payment to that
            participant."


21.  By adding the following new subsection 8.7, immediately after subsection
8.6 of the plan:

      "8.7.  LOANS TO PARTICIPANTS.  While it is the primary purpose of the
      plan to accumulate funds for the participants when they retire, it is
      recognized that under some circumstances it is in the best interests of
      participants to permit loans to be made to them while they continue in
      the active service of the employers.  Accordingly, the committee,
      pursuant to such rules as it may from time to time establish,

                                      -9-

<PAGE>


      and upon written application by a participant supported by such evidence
      as the committee requests, may direct the trustee to make a loan from
      the trust fund to a participant subject to the following:

      (a)   The principal amount of any loan made to a participant shall not
            exceed the lesser of:

            (i)   $50,000, reduced by the amount of the highest outstanding
                  loan balance during the one-year period ending immediately
                  preceding the date of the loan; or

            (ii)  one-half of the participant's vested account balances under
                  the plan.

      (b)   Each loan must be evidenced by a written note in a form approved
            by the committee, shall bear interest at a reasonable rate, and
            shall require substantially level amortization (with payments at
            least quarterly) over the term of the loan.

      (c)   Each loan shall specify a repayment period that shall not extend
            beyond five years.  Repayment of a loan will be made by payroll
            deduction or in accordance with rules established by the
            committee.

      Any loan made under the plan shall be subject to the foregoing
      limitations of this subsection 8.7.  If on a participant's settlement
      date, any loan or portion of a loan made to him under the plan, together
      with the accrued interest thereon, remains unpaid, an amount equal to
      such loan or any part thereof, together with the accrued interest
      thereon, shall be charged to the participant's accounts after all other
      adjustments required under the plan, but before any distribution
      pursuant to subsection 10.6."

22.  By substituting the following for subparagraph 9.2(b) of the plan:

      "(b)  If any company shares credited to the participant accounts or
            corporation accounts of any participant are required to be
            converted to cash because of a withdrawal or loan pursuant to
            Section 8, the committee shall direct the trustee to purchase such
            company shares with participant basic contributions and investment
            change proceeds available for that purpose as

                                      -10-

<PAGE>


            soon as practicable after the effective date of the withdrawal or
            loan."

23.  By substituting the following for subparagraph 9.2(f)(ii) of the plan:

            "(ii)    NEXT, company shares required to be converted to cash
                     so that the trustee may make a withdrawal payment or loan
                     under Section 8 shall be purchased by the trustee in the
                     order in which the withdrawal or loan elections or
                     requests became effective; and"


24.  By adding the following new subparagraph (g) at the end of subsection
10.7 of the plan:

      "(g)  DIRECT TRANSFER OF ELIGIBLE ROLLOVER DISTRIBUTIONS.  If a
            participant's distribution constitutes an eligible rollover
            distribution under Section 402(c)(4) of the Internal Revenue Code,
            then the participant may elect to have such distribution paid
            directly to an eligible retirement plan described in Section
            402(c)(8)(B) of the Internal Revenue Code.  Each election by a
            participant under this subparagraph 10.7(g) shall be made at such
            time and in such manner as the committee shall determine, and
            shall be effective only in accordance with such rules as shall be
            established from time to time by the committee."


25.  By adding the following sentence at the end of subsection 12.4 of the
plan:

      "Notwithstanding any provisions of the plan to the contrary, the
      committee in its discretion and subject to requirements of applicable
      law may permit participants to make investment elections or other
      elections under the plan by telephone through an automated telephone
      system established for this purpose or by any other method authorized by
      the committee as acceptable in lieu of written elections."

                                      -11-

<PAGE>


26.  By adding the following Exhibit I immediately after Section 16 of the
plan:

                                 "EXHIBIT I
                                     TO
                      USG CORPORATION INVESTMENT PLAN


<TABLE>
<CAPTION>

                                          Matching Percentage of
Percentage Achievement of                 Eligible Participants'
Consolidated Earnings Goal                  Basic Contributions
- --------------------------                ----------------------
<S>                                       <C>

            80%                                       10%
            81%                                       11%
            82%                                       12%
            83%                                       13%
            84%                                       14%
            85%                                       15%
            86%                                       16%
            87%                                       17%
            88%                                       18%
            89%                                       19%
            90%                                       20%
            91%                                       21%
            92%                                       22%
            93%                                       23%
            94%                                       24%
            95%                                       25%
            96%                                       26%
            97%                                       27%
            98%                                       28%
            99%                                       29%
           100%                                       30%
           101%                                       32%
           102%                                       34%
           103%                                       36%
           104%                                       38%
           105%                                       40%
           106%                                       42%
           107%                                       44%
           108%                                       46%
           109%                                       48%
           110%                                       50%
           111%                                      52.5%
           112%                                       55%
           113%                                      57.5%
           114%                                       60%
           115%                                      62.5%
           116%                                       65%
           117%                                      67.5%

</TABLE>

                                      -12-

<PAGE>

<TABLE>
<S>                                       <C>
           118%                                       70%
           119%                                      72.5%
           120%                                       75%

</TABLE>

      For each 1% increase in percentage achievement of consolidated earnings
      goal in excess of 120%, the matching percentage of eligible
      participants' basic contributions shall be increased by 2.5%.  Any
      fraction of a percent in the percentage achievement of consolidated
      earnings goal will be rounded up to the nearest whole percentage if .5%
      or more, or rounded down to the nearest whole percentage if under .5%."


                               *      *      *


Particulars 1, 2, 3, 15, 24 and 26 of the foregoing shall be effective as of
January 1, 1993, particulars 4 through 14, particulars 16 through 18 and
particular 20 shall be effective July 1, 1993, and particular 19, particulars
21 through 23 and particular 25 shall be effective October 1, 1993.




IN WITNESS WHEREOF, the company has caused these presents to be signed by an
officer thereunto duly authorized this 30th day of July, 1993.


                                    USG CORPORATION


                                    By ______________________________
                                         Senior Vice President and
                                        Chief Administrative Officer

                                      -13-



<PAGE>



                                                                 EXHIBIT 10(av)







May 6, 1993



Mr. Jack D. Sparks
2704 Highland Court
St. Joseph, MI  49085

Dear Jack:

USG Corporation deeply appreciates your many years of service as a member of
the Board of Directors and as a participant in its various committees.  Your
sound judgment and valued counsel as a director and your unique perspective
will not easily be replaced.  Accordingly, the Corporation desires to enter
into an understanding with you effective this date by which your wisdom,
counsel and advice will continue to be available to it.  The understanding
would be pursuant to the Corporation's policy regarding retired non-employee
directors as set forth in resolutions approved by the Board of Directors.

We propose that you be available to render advice and counsel to the
Corporation to the extent and at times that are mutually agreeable.  During
the period in which this arrangement is in force, you will refrain from any
activity in conflict or competitive with the best interests of the
Corporation.  We would rely upon you to call to our attention any specific
situations which you believe might fall within such prohibition.

In return for the foregoing, the Corporation would undertake to pay you an
annual retainer of twenty-four thousand dollars ($24,000) for a period of five
(5) years.  One quarter of such sum, or a pro rata portion thereof, would be
payable no later than the 25th day of the last month in each calendar quarter
during which this arrangement remains in effect.  It is understood and agreed,
however, that payment for the current calendar quarter up to and including the
date of this letter shall be computed pro rata and covered by your regular fee
arrangment as a director.  Payment for the balance of such quarter shall be
computed pro rata and covered by the provisions of this letter.

The Chief Executive Officer of the Corporation or persons designated by him
shall be the only persons authorized to request your advice, counsel, or
approve your travel expenses, and arrange any conferences between you and
Corporation executives.  Any properly authorized expenses incurred by you in
the interests of the Corporation would, of course, be reimbursed.


<PAGE>


                                     -2-


Under this arrangement, as you would be an independent adviser and not an
employee of the Corporation, the Corporation would make no tax withholding or
other deductions from the retainer payment.  You, in turn, would have no
authority to obligate the Corporation contractually and would make no
representations to the contrary.

As you know, under our policy regarding retired non-employee directors, the
Board, in its sole discretion, may discontinue, change or modify this policy
at any time and in any way.  Accordingly, either of us would have the right to
terminate the proposed arrangement at any time and effective immediately upon
written notice to the other.

If you are in agreement with the foregoing, please sign in the space indicated
below and return one fully executed counterpart original to us.

Continued best wishes, and we look forward to hearing from you.

Very truly yours,

USG CORPORATION




Chairman of the Board




AGREED:



________________________________
Jack D. Sparks



<PAGE>



                                                                 EXHIBIT 10(aw)



August 11, 1993



Mr. James W. Cozad
205 North Michigan Avenue
Suite 4310
Chicago, IL  60601

Dear Jim:

USG Corporation deeply appreciates your many years of service as a member of
the Board of Directors and as a participant in its various committees.  Your
sound judgment and valued counsel as a director and your unique perspective
will not easily be replaced.  Accordingly, the Corporation desires to enter
into an understanding with you effective this date by which your wisdom,
counsel and advice will continue to be available to it.  The understanding
would be pursuant to the Corporation's policy regarding retired non-employee
directors as set forth in resolutions approved by the Board of Directors.

We propose that you be available to render advice and counsel to the
Corporation to the extent and at times that are mutually agreeable.  During
the period in which this arrangement is in force, you will refrain from any
activity in conflict or competitive with the best interests of the
Corporation.  We would rely upon you to call to our attention any specific
situations which you believe might fall within such prohibition.

In return for the foregoing, the Corporation would undertake to pay you an
annual retainer of twenty-four thousand dollars ($24,000) for a period of five
(5) years.  One quarter of such sum, or a pro rata portion thereof, would be
payable no later than the 25th day of the last month in each calendar quarter
during which this arrangement remains in effect.  It is understood and agreed,
however, that payment for the current calendar quarter up to and including the
date of this letter shall be computed pro rata and covered by your regular fee
arrangment as a director.  Payment for the balance of such quarter shall be
computed pro rata and covered by the provisions of this letter.

The Chief Executive Officer of the Corporation or persons designated by him
shall be the only persons authorized to request your advice, counsel, or
approve your travel expenses, and arrange any conferences between you and
Corporation executives.  Any properly authorized expenses incurred by you in
the interests of the Corporation would, of course, be reimbursed.


<PAGE>


                                     -2-



Under this arrangement, as you would be an independent adviser and not an
employee of the Corporation, the Corporation would make no tax withholding or
other deductions from the retainer payment.  You, in turn, would have no
authority to obligate the Corporation contractually and would make no
representations to the contrary.

As you know, under our policy regarding retired non-employee directors, the
Board, in its sole discretion, may discontinue, change or modify this policy
at any time and in any way.  Accordingly, either of us would have the right to
terminate the proposed arrangement at any time and effective immediately upon
written notice to the other.

If you are in agreement with the foregoing, please sign in the space indicated
below and return one fully executed counterpart original to us.

Continued best wishes, and we look forward to hearing from you.

Very truly yours,

USG CORPORATION




Chairman of the Board




AGREED:



_____________________________
James W. Cozad



<PAGE>
                                                                   Exhibit 24(a)





                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



     As independent public accountants, we hereby consent to the use in this
registration statement of our reports dated February 9, 1993, except as to the
Subsequent Event note, which is as of March 17, 1993, included herein and to all
references to our Firm included in this registration statement.





                                             /s/ Arthur Andersen & Co.
                                             ARTHUR ANDERSEN & CO.


Chicago, Illinois,
January 7, 1994

<PAGE>



                                                                     EXHIBIT 25



                            POWER OF ATTORNEY


      WHEREAS, the Board of Directors of USG Corporation (the "Corporation")
has approved the issuance and sale of shares of the Corporation's Common Stock
in a public offering (the "Equity Offering");

      WHEREAS, the Corporation, in connection with the Equity Offering, will
file a Registration Statement on Form S-1 (the "Equity Registration
Statement") under the Securities Act of 1933 (the "Act") with the Securities
and Exchange Commission (the "Commission");

      WHEREAS, the Board of Directors of the Corporation has also approved the
issuance and sale of $150 million principal amount of new senior notes due
2001 ("New Senior Notes") for cash and/or in exchange for its 8% Senior Notes
due 1996 and 8% Senior Notes due 1997; and

      WHEREAS, the Corporation, in connection with the issuance and sale of
New Senior Notes, will file with the Commission under the Act a registration
statement (the "Debt Registration Statement") covering the sale (or resales)
of New Senior Notes.

      NOW, THEREFORE:

      KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Richard H. Fleming, John E. Malone and Raymond
T. Belz and each of them, his true and lawful attorneys-in-fact and agents,
with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to:

      (i)   sign the Equity Registration Statement and any or all amendments
            thereto, and to file the same, with all exhibits thereto, and
            other documents in connection therewith, with the Commission; and

      (ii)  sign the Debt Registration Statement and any or all amendments
            thereto, and to file the same, with all exhibits thereto, and
            other documents in connection therewith, with the Commission;

granting unto said attorneys-in-fact and agents, and each of them, full power
and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as he might or could do in person, hereby ratifying and confirming
all that said attorneys-in-fact and agents or any of them, or their or his
substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.


<PAGE>


      This power of attorney has been signed on January 4, 1994 by the
following persons:


<TABLE>
<CAPTION>
            SIGNATURE                            TITLE
            ---------                            -----

<S>                                       <C>
/s/ Eugene B. Connolly                    Chairman of the Board, Chief
- ---------------------------------         Executive Officer, and Director
Eugene B. Connolly


/s/ Anthony J. Falvo, Jr.                 Vice Chairman and Director
- ---------------------------------
Anthony J. Falvo, Jr.


/s/ Robert L. Barnett                     Director
- ---------------------------------
Robert L. Barnett


/s/ Keith A. Brown                        Director
- ---------------------------------
Keith A. Brown


/s/ W.H. Clark                            Director
- ---------------------------------
W.H. Clark


/s/ James C. Cotting                      Director
- ---------------------------------
James C. Cotting


/s/ Lawrence M. Crutcher                  Director
- ---------------------------------
Lawrence M. Crutcher


/s/ Wade Fetzer III                       Director
- ---------------------------------
Wade Fetzer III


/s/ David W. Fox                          Director
- ---------------------------------
David W. Fox


</TABLE>
<PAGE>

<TABLE>
<CAPTION>
            SIGNATURE                            TITLE
            ---------                            -----
<S>                                       <C>

                                          Director
- --------------------------------
Philip C. Jackson, Jr.


/s/ Marvin E. Lesser                      Director
- --------------------------------
Marvin E. Lesser


/s/ John B. Schwemm                       Director
- --------------------------------
John B. Schwemm


/s/ Alan G. Turner                        Director
- --------------------------------
Alan G. Turner


/s/ Barry L. Zubrow                       Director
- --------------------------------
Barry L. Zubrow

</TABLE>




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