NCI BUILDING SYSTEMS INC
S-3/A, 1998-09-02
PREFABRICATED METAL BUILDINGS & COMPONENTS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 2, 1998
    
 
   
                                                      REGISTRATION NO. 333-60829
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                                ---------------
 
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
 
                            ------------------------
 
                           NCI BUILDING SYSTEMS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                              <C>
           DELAWARE                 76-0127701
 (State or other jurisdiction    (I.R.S. Employer
              of                  Identification
incorporation or organization)         No.)
</TABLE>
 
                                 7301 FAIRVIEW
                              HOUSTON, TEXAS 77041
                                 (713) 466-7788
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
 
                               ROBERT J. MEDLOCK
                   VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                                 7301 FAIRVIEW
                              HOUSTON, TEXAS 77041
                                 (713) 466-7788
 
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                            ------------------------
 
                                   COPIES TO:
 
         RANDALL G. RAY, ESQ.                     STEVEN R. FINLEY, ESQ.
       Gardere & Wynne, L.L.P.                 Gibson, Dunn & Crutcher LLP
     1601 Elm Street, Suite 3000                     200 Park Avenue
       Dallas, Texas 75201-4761               New York, New York 10166-0193
            (214) 999-4544                            (212) 351-4000
 
                            ------------------------
 
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
                            ------------------------
 
   
    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 THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
   
                 SUBJECT TO COMPLETION, DATED SEPTEMBER 2, 1998
    
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 TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE 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>
PROSPECTUS________________________________________________________________, 1998
 
                                3,800,000 Shares
 
   
                                     [LOGO]
 
                                  Common Stock
    
- -------------------------------------------------------------------------
 
Of the 3,800,000 shares of Common Stock (the "Common Stock") offered hereby (the
"Offering"), 3,500,000 shares are being offered by NCI Building Systems, Inc.
(the "Company") and 300,000 shares are being offered by the Selling
Stockholders. See "Principal and Selling Stockholders." The Company will not
receive any of the proceeds from the sale of shares of Common Stock by the
Selling Stockholders.
 
   
The Common Stock is listed on the New York Stock Exchange ("NYSE") under the
symbol "NCS." On September 1, 1998, the last reported sale price of the Common
Stock on the NYSE was $18.625 per share. See "Price Range of Common Stock."
    
 
FOR A DISCUSSION OF CERTAIN RISKS OF AN INVESTMENT IN THE SHARES OF COMMON STOCK
OFFERED HEREBY, SEE "RISK FACTORS" BEGINNING ON PAGE 10.
 
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>
<CAPTION>
                                                                Underwriting                             Proceeds to
                                                Price to       Discounts and         Proceeds to             Selling
                                                  Public      Commissions(1)          Company(2)        Stockholders
<S>                                   <C>                 <C>                 <C>                 <C>
- --------------------------------------------------------------------------------------------------------------------
Per Share...........................                   $                   $                   $                   $
- --------------------------------------------------------------------------------------------------------------------
Total(3)............................                   $                   $                   $                   $
- --------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) THE COMPANY AND CERTAIN OF THE SELLING STOCKHOLDERS HAVE AGREED TO INDEMNIFY
    THE UNDERWRITERS AGAINST CERTAIN LIABILITIES, INCLUDING LIABILITIES UNDER
    THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). SEE
    "UNDERWRITING."
 
(2) BEFORE DEDUCTING ESTIMATED EXPENSES OF THE OFFERING OF $500,000, ALL OF
    WHICH WILL BE PAID BY THE COMPANY.
 
(3) THE COMPANY AND CERTAIN OF THE SELLING STOCKHOLDERS HAVE GRANTED THE
    UNDERWRITERS A 30-DAY OPTION TO PURCHASE UP TO 570,000 ADDITIONAL SHARES OF
    COMMON STOCK ON THE SAME TERMS PER SHARE SOLELY TO COVER OVER-ALLOTMENTS, IF
    ANY. IF SUCH OPTION IS EXERCISED IN FULL, THE TOTAL PRICE TO PUBLIC WILL BE
    $         , THE TOTAL UNDERWRITING DISCOUNTS AND COMMISSIONS WILL BE
    $         , THE TOTAL PROCEEDS TO COMPANY WILL BE $         AND THE TOTAL
    PROCEEDS TO SELLING STOCKHOLDERS WILL BE $         . SEE "PRINCIPAL AND
    SELLING STOCKHOLDERS" AND "UNDERWRITING."
 
The Common Stock is being offered by the Underwriters as set forth under
"Underwriting" herein. It is expected that the delivery of certificates therefor
will be made at the offices of Warburg Dillon Read LLC, New York, New York, on
or about             , against payment therefor. The Underwriters include:
 
WARBURG DILLON READ LLC
 
             J.C. BRADFORD & CO.
 
                          WHEAT FIRST UNION
 
                                        DAIN RAUSCHER WESSELS                  A
DIVISION OF DAIN RAUSCHER INCORPORATED
 
<PAGE>
                                   [Graphics]
 
   
    Page 2 of the Prospectus includes photographs of the Company's products
and/or manufacturing processes, each with a brief, descriptive caption.
    
 
   
CERTAIN PERSONS PARTICIPATING IN THE OFFERING MAY ENGAGE IN TRANSACTIONS THAT
STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK, INCLUDING
OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN THE COMMON STOCK
AND THE IMPOSITION OF A PENALTY BID, DURING AND AFTER THIS OFFERING. FOR A
DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
    
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING SUMMARY INFORMATION IS QUALIFIED IN ITS ENTIRETY BY, AND
SHOULD BE READ IN CONJUNCTION WITH, THE CONSOLIDATED FINANCIAL STATEMENTS AND
NOTES THERETO AND MORE DETAILED INFORMATION INCLUDED ELSEWHERE IN THIS
PROSPECTUS. UNLESS THE CONTEXT OTHERWISE REQUIRES, (I) "NCI" MEANS NCI BUILDING
SYSTEMS, INC., ITS SUBSIDIARIES (INCLUDING LIMITED PARTNERSHIPS) AND
UNCONSOLIDATED AFFILIATES AND PREDECESSORS, BUT EXCLUDES MBCI (AS DEFINED
HEREIN), (II) "MBCI" MEANS, PRIOR TO NCI'S ACQUISITION OF MBCI (THE "MBCI
ACQUISITION"), METAL BUILDING COMPONENTS, INC., ITS SUBSIDIARIES AND
UNCONSOLIDATED AFFILIATES AND, AFTER THE MBCI ACQUISITION, THE ACQUIRED
OPERATIONS OF MBCI AND (III) THE "COMPANY" MEANS NCI AND MBCI. REFERENCES TO
NCI'S OR THE COMPANY'S "FISCAL YEAR" MEAN THE FISCAL YEAR OF NCI OR THE COMPANY
ENDED OCTOBER 31 OF THE YEAR SPECIFIED. UNLESS OTHERWISE INDICATED, THE
INFORMATION IN THIS PROSPECTUS ASSUMES THE UNDERWRITERS' OVER-ALLOTMENT OPTION
IS NOT EXERCISED AND GIVES EFFECT TO THE TWO-FOR-ONE STOCK SPLIT OF THE COMMON
STOCK ON JULY 23, 1998.
 
                                  THE COMPANY
 
   
    The Company is one of North America's largest integrated manufacturers of
metal products for the building industry, with 38 manufacturing and distribution
facilities located in 18 states and Mexico. The Company sells metal components
as well as complete, pre-engineered metal building systems, offering one of the
most extensive metal product lines in the building industry with well-recognized
brand names. Management believes that the Company's leading market positions and
strong track record of growth and profitability have resulted from its focus on
improving manufacturing efficiency, controlling overhead costs, developing new
markets and successfully identifying and integrating strategic acquisitions. In
May 1998, NCI acquired MBCI, thereby doubling its sales, becoming the largest
domestic manufacturer of nonresidential metal components and significantly
improving its product mix. On a pro forma basis giving effect to the MBCI
Acquisition, the Company's sales and income from operations were $849.0 million
and $95.0 million, respectively, for the 12-month period ended July 31, 1998.
    
 
    Management believes that metal products have gained and continue to gain a
greater share of the new construction and repair and retrofit markets due to
increasing acceptance and recognition of the benefits of metal products in
building applications. Metal components offer builders, designers, architects
and end-users several advantages, including low lifecycle costs, longevity,
attractive aesthetics and design flexibility. Similarly, metal building systems
offer a number of advantages over traditional construction alternatives,
including shorter construction time, more efficient material utilization, lower
construction costs, greater ease of expansion and lower maintenance costs.
 
   
    METAL COMPONENTS.  With a market share at least twice that of its largest
competitor, the Company is the largest domestic supplier of metal components to
the nonresidential building industry. The Company designs, manufactures, sells
and distributes one of the widest selections of metal roof and wall systems,
overhead doors, fascia, mansard and various trim accessories for commercial,
industrial, architectural, agricultural and residential construction and repair
and retrofit uses. The Company is also one of the largest independent providers
of hot roll and light gauge metal coil coating and painting services and
products. The Company coats and paints hot roll coil metal for use in its own
metal components manufacturing, as well as processing hot roll coil metal and
toll coating light gauge metal for use by third parties. The Company markets its
metal components products and coating and painting services nationwide primarily
through a direct sales force under several brand names, including "Metal
Building Components," "American Building Components," "DBCI," "MBCI," "Metal
Coaters of Georgia," "Metal-Prep," "DOUBLECOTE" and "Metal Coaters of
California." On a pro forma basis giving effect to the MBCI Acquisition, the
Company's sales of metal components and coating and painting services were
$584.9 million, or 68.9% of total sales, for the 12-month period ended July 31,
1998.
    
 
                                       3
<PAGE>
   
    PRE-ENGINEERED METAL BUILDING SYSTEMS.  NCI is one of the largest domestic
suppliers of pre-engineered metal building systems. The Company designs,
manufactures and markets pre-engineered metal building systems, self-storage
building systems and metal home framing systems for commercial, industrial,
agricultural, governmental, community service and residential uses. The Company
markets these systems nationwide through authorized builder networks totaling
over 1,200 builders and a direct sales force under several brand names,
including "Metallic Buildings," "Mid-West Steel Buildings," "A & S Buildings,"
"All American Systems," "Steel Systems" and "Mesco." On a pro forma basis giving
effect to the MBCI Acquisition, the Company's sales of pre-engineered metal
building systems were $264.1 million, or 31.1% of total sales, for the 12-month
period ended July 31, 1998.
    
 
    Prior to their combination, NCI and MBCI both demonstrated strong growth in
sales and income from operations. NCI achieved five-year compound annual growth
rates of 38.9% and 49.6%, respectively, in sales and income from operations.
MBCI achieved five-year compound annual growth rates of 15.3% and 16.2%,
respectively, in sales and income from operations.
 
                              THE MBCI ACQUISITION
 
    On May 4, 1998, NCI acquired MBCI for a purchase price of $600 million.
Following the consummation of the MBCI Acquisition, management implemented an
integration plan to realize immediate and longer-term benefits. Management
estimates potential cost savings and synergies at $15 million annually. The main
objectives of the integration plan include:
 
    - Realizing economies of scale, including purchasing efficiencies;
 
    - Expanding internal metal coil coating and painting capacity and utilizing
      internal capacity to produce products that were previously purchased from
      third parties;
 
    - Cross-selling broader product lines to a wider customer base;
 
    - Expanding the geographic scope of operations throughout the United States;
 
    - Rationalizing production capacity to maximize productivity and eliminate
      redundant costs;
 
    - Consolidating metal components management, sales and marketing; and
 
    - Eliminating duplicate administrative costs.
 
                               COMPANY STRENGTHS
 
    The Company believes that the combined NCI and MBCI operations will be able
to continue to grow sales, income from operations, net income and net income per
share by capitalizing on the following strengths:
 
        LEADING MARKET POSITIONS AND SCALE OF OPERATIONS.  The Company is the
    largest manufacturer of metal components for the nonresidential building
    industry and one of the largest suppliers of pre-engineered metal building
    systems in the United States. In addition, the Company is one of the largest
    independent providers of coated steel. As a result of its leading market
    positions and scale of operations, the Company has expanded its geographic
    scope to meet customers' product and delivery needs, realized production
    efficiencies and improved its ability to attract builders and other
    customers.
 
        BALANCE BETWEEN NEW CONSTRUCTION AND REPAIR AND RETROFIT
    END-MARKETS.  Prior to the MBCI Acquisition, NCI's business was focused
    primarily on pre-engineered metal building systems, demand for which is
    driven primarily by new building construction. The Company currently derives
    a majority of its sales and net income from metal components sales, which
    are used in a number of repair and retrofit applications as well as new
    construction. Management believes that the balance between these end markets
    reduces the impact on the Company of slowdowns in new construction activity
    and provides enhanced growth opportunities.
 
                                       4
<PAGE>
   
        LOW-COST SUPPLIER.  The Company strives to be the low-cost supplier to
    its customers by maintaining low production and distribution costs. The
    Company's large scale manufacturing capabilities provide purchasing
    efficiencies and enhance productivity through the sharing of best practices
    between metal components and pre-engineered metal building systems
    operations. In addition, the Company's "hub and spoke" system of satellite
    manufacturing facilities places the locations for the manufacture of
    secondary structural framing and covering systems and final distribution
    closer to the customer, thereby reducing transportation costs and delivery
    times.
    
 
        BROAD PRODUCT LINES AND DIVERSE CUSTOMER BASE.  The addition of MBCI's
    metal components operations, including metal coating and painting, to NCI's
    pre-engineered metal building systems has enabled the Company to become one
    of the largest integrated suppliers in the industry, offering a wider
    variety of products and services. In addition, the Company has a broad and
    diversified customer base with significant cross-selling opportunities.
 
        NATIONWIDE COVERAGE.  The MBCI Acquisition provides the Company with the
    opportunity to expand substantially its manufacturing, selling and
    distribution presence into new geographic markets. The Company's
    pre-engineered metal building systems facilities in the South, Southwest and
    West complement its metal components facilities nationwide. The addition of
    MBCI's metal components locations in the Northeast and Northwest provide the
    Company with access to new regional markets for the Company's pre-engineered
    metal building systems.
 
   
        EXPERIENCED MANAGEMENT TEAM.  The Company's senior management team has
    an average of over 20 years of industry experience and has significantly
    increased its depth as a result of the MBCI Acquisition. The management
    teams of NCI and MBCI share similar business philosophies and historically
    have demonstrated an ability to grow sales and net income in times of
    strong, as well as adverse, economic conditions. Management attributes this
    ability to effectively marketing its products, strategically locating new
    manufacturing facilities, controlling expenses, maintaining flexibility in
    capital budgeting, reducing production and distribution costs and
    successfully completing and integrating acquisitions. In addition, the two
    management teams have successfully identified and completed nine
    acquisitions in the last five years. The Company's senior management team
    will own approximately 12.3% of the Common Stock after giving effect to the
    Offering.
    
 
                               BUSINESS STRATEGY
 
    The Company's management has developed business strategies to capitalize on
the Company's strengths. The Company's primary business strategies include the
following:
 
        PURSUE STRATEGIC GROWTH OPPORTUNITIES.  Throughout its history, the
    Company has increased its sales and net income through a combination of
    selective acquisitions and internal growth. Since 1993, the Company has
    successfully acquired and integrated seven companies and is in the process
    of integrating MBCI and a subsequently acquired metal coating and painting
    operation. In order to expand its geographic coverage and increase
    manufacturing capacity, the Company has also constructed nine new
    manufacturing facilities in the last five years and has formed four joint
    ventures to expand into new markets and to increase penetration of existing
    markets.
 
        LEVERAGE EXISTING DISTRIBUTION CHANNELS TO INCREASE SALES OF METAL
    COMPONENTS.  The Company seeks to penetrate further the metal components
    market, primarily for metal roofing and wall systems. Currently, the Company
    sells its products under well-recognized brand names through various
    distribution channels to a broad range of end users. These channels include,
    among others, (i) authorized builders, (ii) building materials
    manufacturers, distributors and retailers, (iii) roofing systems installers,
    (iv) contractors and end users and (v) builders of self-storage facilities.
    The Company plans to increase sales and net income by utilizing its multiple
    distribution channels to market its expanded range of metal components
    products to existing and new customers.
 
                                       5
<PAGE>
        CONTINUE TO ENHANCE FLEXIBLE, COST-EFFECTIVE PRODUCTION FACILITIES AND
    PROCESSES.  The Company's commitment to providing its customers with quality
    products on a timely basis at competitive prices remains a key element of
    its business strategy. As a result, management is focused on continuous cost
    reduction including realization of opportunities to (i) aggressively manage
    the purchase of raw materials, (ii) further automate its manufacturing
    operations to reduce process costs and improve product quality and (iii)
    capitalize on the breadth of the Company's geographic coverage to provide
    customers with rapid delivery.
 
        INCREASE SALES OF PRE-ENGINEERED METAL BUILDING SYSTEMS IN NEW AND
    EXISTING GEOGRAPHIC MARKETS. The addition of MBCI's metal components
    locations nationwide provides the Company with an opportunity to expand
    sales of the Company's pre-engineered metal building systems in existing
    markets and provides access to new regional markets in the Northeast and
    Northwest. By utilizing MBCI's nationwide metal components manufacturing
    facilities as platforms for expansion, the Company is well positioned to
    increase sales of pre-engineered metal building systems in markets that
    previously had been difficult for NCI to serve on a cost-effective basis.
 
                            ------------------------
 
    NCI was incorporated in Texas in December 1984 and reincorporated in
Delaware in December 1991. The Company's principal executive offices are located
at 7301 Fairview, Houston, Texas 77041, and its telephone number at that address
is (713) 466-7788.
 
                                  THE OFFERING
 
   
<TABLE>
<CAPTION>
<S>                                                                    <C>           <C>
Common Stock offered by the Company..................................     3,500,000  shares
Common Stock offered by the Selling Stockholders.....................       300,000  shares
                                                                       ------------
    Total Common Stock offered.......................................     3,800,000  shares
                                                                       ------------
                                                                       ------------
Common Stock to be outstanding after the Offering....................    21,740,648  shares(1)
Use of proceeds by the Company.......................................  To repay a portion of the indebtedness of the
                                                                       Company under its Senior Credit Facility (as
                                                                       defined herein) incurred in connection with
                                                                       the MBCI Acquisition. See "Use of Proceeds."
Nasdaq symbol........................................................  NCS
</TABLE>
    
 
- ------------------------
 
   
(1) Based upon shares outstanding as of August 31, 1998. Excludes (i) 1,681,828
    shares issuable upon exercise of outstanding options, with a weighted
    average exercise price of $14.13 per share, under the Company's Employee
    Stock Option Plan as of August 31, 1998, and (ii) 100,250 shares issuable as
    of August 31, 1998, pursuant to a convertible debenture held by a member of
    the senior management team at a conversion price of $14.9625 per share.
    Includes 186,166 shares of Common Stock to be issued upon the exercise of
    options by certain selling stockholders prior to the closing of the
    Offering. See "Principal and Selling Stockholders."
    
 
                                  RISK FACTORS
 
    For a discussion of certain factors that should be considered in connection
with an investment in the Common Stock, see "Risk Factors."
 
                                       6
<PAGE>
               SUMMARY UNAUDITED PRO FORMA FINANCIAL INFORMATION
 
   
    The following table presents summary unaudited pro forma condensed combined
financial information of the Company for the fiscal year ended October 31, 1997,
the nine months ended July 31, 1998, and the 12-month period ended July 31,
1998. The unaudited pro forma condensed combined statements of income give
effect to the MBCI Acquisition as if it had occurred on November 1, 1996. The
unaudited pro forma financial information is not necessarily indicative of
either the future results of operations or the results of operations that would
have occurred if the MBCI Acquisition had been completed on the indicated date.
In the MBCI Acquisition, NCI acquired all of the capital stock of Amatek
Holdings, Inc., the former indirect parent company of MBCI ("Amatek"). The
unaudited pro forma financial information reflects only the results of
operations and financial condition of Amatek for the periods indicated. Because
Amatek had a fiscal year ended December 31, the unaudited pro forma financial
information presented for the year ended October 31, 1997, the nine months ended
July 31, 1998, and the 12-month period ended July 31, 1998, includes financial
information of Amatek for the year ended December 31, 1997, the six months ended
March 31, 1998, and the nine-month period ended March 31, 1998, respectively.
The Company's consolidated results of operations for the nine months ended July
31, 1998 reflect NCI's operations prior to the MBCI Acquisition and combined NCI
and MBCI operations for the third quarter of fiscal 1998. The Company's
unaudited consolidated balance sheet as of July 31, 1998 gives effect to the
MBCI Acquisition and no pro forma adjustments are required. See "The MBCI
Acquisition." The summary unaudited pro forma financial information should be
read in conjunction with the Unaudited Pro Forma Condensed Combined Financial
Statements and notes thereto, "Management's Discussion and Analysis of Financial
Condition and Results of Operations," the Company's/NCI's historical
consolidated financial statements and notes thereto and Amatek's historical
consolidated financial statements and notes thereto included elsewhere in this
Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                                                                         NINE MONTHS     TWELVE MONTHS
                                                                       YEAR ENDED      ENDED JULY 31,   ENDED JULY 31,
                                                                    OCTOBER 31, 1997        1998             1998
                                                                    -----------------  ---------------  ---------------
                                                                           (IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                                                 <C>                <C>              <C>
STATEMENT OF INCOME DATA:
Sales.............................................................      $   815.7         $   617.9        $   849.0
Cost of sales.....................................................          611.7             462.7            636.2
                                                                           ------            ------           ------
Gross profit......................................................          204.0             155.2            212.8
Operating expenses................................................          108.8              86.6            115.7
Nonrecurring acquistion expenses(1)...............................         --                   2.1              2.1
                                                                           ------            ------           ------
Income from operations............................................           95.2              66.5             95.0
Interest expense..................................................           44.4              32.4             43.5
Nonrecurring gain(2)..............................................            3.3               3.3              3.3
Other income......................................................            2.7               2.5              3.8
                                                                           ------            ------           ------
Income before income taxes........................................           56.8              39.9             58.6
Provision for income taxes........................................           25.4              17.2             25.5
                                                                           ------            ------           ------
Net income........................................................      $    31.4         $    22.7        $    33.1
                                                                           ------            ------           ------
                                                                           ------            ------           ------
Net income per share:
  Basic...........................................................      $    1.79         $    1.27        $    1.86
                                                                           ------            ------           ------
                                                                           ------            ------           ------
  Diluted.........................................................      $    1.70         $    1.20        $    1.76
                                                                           ------            ------           ------
                                                                           ------            ------           ------
Weighted average number of common shares:
  Basic...........................................................           17.5              17.9             17.8
  Diluted.........................................................           18.5              18.9             18.8
OTHER FINANCIAL DATA:
EBITDA(3).........................................................      $   125.7         $    91.0        $   133.9
Capital expenditures..............................................           38.5              17.9             30.1
</TABLE>
    
 
- ------------------------------
   
(1) Nonrecurring acquisition expenses in the third quarter of fiscal 1998 for
    severance and relocation expenses related to the consolidation of components
    sales and marketing functions, estimated costs associated with announced
    plant closures and consolidations and costs associated with the integration
    of product lines.
    
 
   
(2) Nonrecurring gain reflects insurance recoveries for fire damage to MBCI's
    Lubbock, Texas plant in 1997.
    
 
   
(3) "EBITDA" consists of net income before interest expense, taxes, depreciation
    and amortization and minority interest. EBITDA is not a measure of financial
    performance under generally accepted accounting principles, but is presented
    here to provide additional information about operations. EBITDA should not
    be considered as an alternative to, or more meaningful than, net income or
    cash flows as an indicator of operating performance or as a better measure
    of liquidity. EBITDA presented above may not be comparable to similarly
    titled measures of other companies. See the consolidated financial
    statements and notes thereto included elsewhere in this Prospectus for
    information regarding operating, investing and financing cash flow
    activities.
    
 
                                       7
<PAGE>
             SUMMARY HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
 
   
    Summary historical consolidated financial information for the Company/NCI
and for MBCI is presented below. The Company's consolidated results of
operations for the nine months ended July 31, 1998 reflect NCI's operations
prior to the MBCI Acquisition and combined NCI and MBCI operations for the third
quarter of fiscal 1998. The following financial information should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations," the Company/ NCI's historical consolidated financial
statements and notes thereto and Amatek's historical consolidated financial
statements and notes thereto included elsewhere in this Prospectus.
    
 
   
THE COMPANY/NCI
    
 
   
<TABLE>
<CAPTION>
                                                                                                            NINE MONTHS ENDED
                                                                              YEAR ENDED OCTOBER 31,             JULY 31,
                                                                          -------------------------------  --------------------
                                                                            1995       1996       1997       1997       1998
                                                                          ---------  ---------  ---------  ---------  ---------
                                                                                  (IN MILLIONS, EXCEPT PER SHARE DATA)
<S>                                                                       <C>        <C>        <C>        <C>        <C>
STATEMENT OF INCOME DATA:
Sales...................................................................  $   234.2  $   332.9  $   407.7  $   287.0  $   422.2
Gross profit............................................................       64.4       91.5      108.3       75.9      112.8
Income from operations..................................................       26.3       38.4       42.3       28.0       46.6
Net income..............................................................  $    17.0  $    24.8  $    27.9  $    18.3  $    23.5
Net income per share:
  Basic.................................................................  $    1.36  $    1.60  $    1.73  $    1.14  $    1.39
  Diluted...............................................................  $    1.26  $    1.51  $    1.64  $    1.08  $    1.31
 
OTHER FINANCIAL DATA:
EBITDA..................................................................  $    30.3  $    45.8  $    52.2  $    35.1  $    60.1
Capital expenditures....................................................        5.8       10.3       11.3        5.4        7.4
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                                          AS OF
                                                                                                      JULY 31, 1998
                                                                                                      -------------
<S>                                                                                                   <C>
BALANCE SHEET DATA:
Working capital.....................................................................................    $    68.8
Property, plant and equipment, net..................................................................        166.0
Total assets........................................................................................        809.6
Total debt..........................................................................................        500.1
Shareholders' equity................................................................................        209.5
</TABLE>
    
 
   
MBCI
    
 
   
<TABLE>
<CAPTION>
                                                                                                            THREE MONTHS ENDED
                                                                              YEAR ENDED DECEMBER 31,
                                                                                                                MARCH 31,
                                                                          -------------------------------  --------------------
                                                                            1995       1996       1997       1997       1998
                                                                          ---------  ---------  ---------  ---------  ---------
                                                                                              (IN MILLIONS)
<S>                                                                       <C>        <C>        <C>        <C>        <C>
STATEMENT OF INCOME DATA:
Sales...................................................................  $   315.7  $   362.9  $   408.0  $    82.5  $    84.2
Gross profit............................................................       81.7       91.6       95.6       18.6       15.3
Income from operations..................................................       56.8       61.9       58.9       10.1        5.7
Net income..............................................................  $    33.9  $    38.6  $    39.7  $     6.1  $     3.6
 
OTHER FINANCIAL DATA:
EBITDA..................................................................  $    61.0  $    69.0  $    71.2  $    11.8  $     9.3
Capital expenditures....................................................       12.5       21.1       27.2        5.8        1.6
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                                          AS OF
                                                                                                     MARCH 31, 1998
                                                                                                    -----------------
<S>                                                                                                 <C>
BALANCE SHEET DATA:
Working capital...................................................................................      $    76.1
Property, plant and equipment, net................................................................          104.0
Total assets......................................................................................          243.2
Total debt........................................................................................            0.0
Shareholder's equity..............................................................................          208.4
</TABLE>
    
 
                                       8
<PAGE>
                                  RISK FACTORS
 
    IN ADDITION TO THE OTHER INFORMATION SET FORTH ELSEWHERE IN THIS PROSPECTUS
AND THE DOCUMENTS INCORPORATED BY REFERENCE HEREIN, PROSPECTIVE INVESTORS SHOULD
CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS IN EVALUATING THE COMPANY AND ITS
BUSINESS BEFORE PURCHASING SHARES OF THE COMMON STOCK OFFERED HEREBY.
 
THE MBCI ACQUISITION--SUCCESSFUL INTEGRATION
 
    The MBCI Acquisition involves a number of risks that could materially
adversely affect the Company's operating results. The integration of MBCI with
NCI will require substantial management time and other resources and may pose
risks with respect to production, customer service and market share. There can
be no assurance that the Company will not experience difficulties with various
aspects of the business combination, including relationships with customers,
suppliers or employees, systems integration, the continued use of separate
operational or management information systems or internal controls. The Company
may also be subject to unanticipated product liability claims or environmental
liabilities. In addition, there can be no assurance that benefits from the MBCI
Acquisition will be realized or that the combination of NCI and MBCI will be
more successful than these companies would have been had they remained separate.
See "The MBCI Acquisition," "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources" and
"Business."
 
SUBSTANTIAL LEVERAGE
 
   
    The Company is highly leveraged and has substantial debt service
requirements. At July 31, 1998, on an as adjusted basis giving effect to the
Offering, the total debt of the Company would have been approximately $438.7
million and 61.8% of the Company's total capitalization. Subject to the
restrictions under the Senior Credit Facility, the Company may incur additional
indebtedness from time to time to provide working capital and for other general
corporate purposes. The Company's leverage and obligations could have important
consequences for holders of the Common Stock, including the following: (i) a
substantial portion of the Company's cash flow from operations must be dedicated
to debt service and will not be available for other purposes; (ii) the Company's
ability to obtain additional debt financing in the future for working capital,
acquisitions, capital expenditures or other purposes may be limited; (iii)
certain of the Company's indebtedness contains financial and other restrictive
covenants which, if breached, could result in an event of default under such
indebtedness; and (iv) the Company's level of indebtedness could limit its
flexibility in planning for and reacting to, and make it more vulnerable to,
competitive pressures and changes in industry and economic conditions generally.
If the Company is unable to generate sufficient cash flow to service its
indebtedness and fund its capital or other expenditures, it will be forced to
adopt an alternative strategy that may include reducing or delaying capital
expenditures, selling assets, refinancing of indebtedness or seeking additional
equity or debt capital. There can be no assurance that any of these strategies
could be effected on satisfactory terms, if at all. See "The MBCI Acquisition"
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."
    
 
INDUSTRY CYCLICALITY; GEOGRAPHIC CONCENTRATION
 
    The nonresidential construction industry is highly sensitive to national and
regional economic conditions and from time to time has been adversely affected
in various geographic regions by unfavorable economic conditions, low
manufacturing capacity utilization, high vacancy rates, changes in tax laws
affecting the real estate industry, high interest rates and the unavailability
of financing. Sales of the
Company's products may be adversely affected by weakness in demand for its
products within particular customer groups, including builders of self-storage
facilities, or a recession in the metal building industry, the general
construction industry or particular geographic regions. The Company cannot
predict the timing or severity of future economic or industry downturns. Any
economic downturn, particularly in states where much of the Company's sales are
concentrated, could have a material adverse effect on the Company's
 
                                       9
<PAGE>
results of operations and financial condition. The markets for metal components,
including overhead doors, self-storage buildings and metal home framing systems
are also highly sensitive to overall economic conditions, high interest rates
and the availability of financing.
 
RISKS ASSOCIATED WITH EXPANSION STRATEGY
 
    The Company has grown and intends to continue to grow by, among other
things, establishing additional plants, further developing its authorized
builder networks and acquiring other manufacturers of complementary products.
There can be no assurance that the Company will be able to accomplish these
goals. Continued growth may strain the Company's physical and human resources,
as well as create a need to attract additional qualified management, which may
not be readily available. In addition, many builders already are authorized
builders for competitors of the Company. The Company's ability to expand its
market share depends on its ability to persuade a number of these builders to
market the Company's products in lieu of or in addition to those of its
competitors and to attract conventional contractors to the metal building and
metal home industries. Furthermore, there can be no assurance that the Company
will be able to identify or finance suitable acquisitions in the future.
Acquisitions may have an adverse effect upon the Company's results of operations
and financial condition while the operations of the acquired businesses are
being integrated into the Company's operations. Furthermore, the integration of
acquired businesses may result in unforeseen difficulties that require a
disproportionate amount of management's attention or other Company resources.
See "Business--Business Strategy."
 
AVAILABILITY AND PRICING OF RAW MATERIALS
 
    The Company's principal raw material is steel. The Company does not have any
long-term contracts for the purchase of raw materials. On a combined basis for
their respective 1997 fiscal years, NCI and MBCI purchased an aggregate of
approximately 80% of their steel requirements from National Steel Corporation
and Bethlehem Steel Corporation. The Company has not traditionally maintained an
inventory of steel in excess of its current production requirements. There can
be no assurance that steel will remain available or that prices will remain
stable. The steel industry is highly cyclical in nature, and steel prices are
influenced by numerous factors beyond the control of the Company, including
general economic conditions, competition, labor costs, import duties and other
trade restrictions. Furthermore, a prolonged labor strike against one or more of
the Company's principal domestic suppliers could have a material adverse effect
on the Company's operations. If the available supply of steel declines or if one
or more of the Company's current sources is unable for any reason to meet the
Company's requirements, the Company could experience price increases, a
deterioration of service from its suppliers or interruptions or delays that may
cause the Company to fail to meet delivery schedules to its customers, any of
which could adversely affect the Company's results of operations and financial
condition. See "Business--Raw Materials."
 
SEASONAL NATURE OF BUSINESS; POSSIBLE VOLATILITY OF STOCK PRICE
 
    The metal components and metal building systems businesses, as well as the
construction industry in general, are seasonal in nature. Sales and shipments
normally are lower in the first calendar quarter of each year compared to the
other three quarters because of unfavorable weather conditions for construction
(particularly in the northern United States) and typical business planning
cycles affecting construction. This seasonality adversely affects the Company's
results of operations for the first two fiscal quarters. Prolonged severe winter
weather conditions can delay construction projects and otherwise adversely
affect the Company's business. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Quarterly Results." As a result,
the market price for shares of the Common Stock may be subject to wide
fluctuations in response to variations in the Company's quarterly results,
changes in the metal components and building industry or the failure by the
Company to meet securities analysts' expectations.
 
                                       10
<PAGE>
DEPENDENCE ON KEY PERSONNEL
 
    The future success of the Company depends to a significant degree on the
continued service of its key personnel and on its ability to attract, motivate
and retain qualified employees. The loss of the services of any of the Company's
key personnel could have a material adverse effect upon the Company's results of
operations and financial condition. See "Management."
 
COMPETITION
 
    Competition in the metal components and metal buildings markets of the
building industry is intense and is based primarily on price, speed of
construction, quality of builder networks, the ability to provide added value in
the design and engineering of buildings and, among manufacturers of metal
components and metal building systems, service, quality and delivery times. The
Company competes with a number of other manufacturers of metal components and
metal building systems ranging from small local firms to large national firms.
In addition, the Company and other manufacturers of metal components and metal
building systems compete with alternative methods of building construction,
which may be perceived as more traditional, more aesthetically pleasing or
having other advantages. See "Business--Competition."
 
POSSIBLE IMPACT OF ENVIRONMENTAL REGULATION AND CLAIMS
 
    The Company's operations are subject to a wide variety of federal, state and
local laws and regulations governing, among other things, emissions to air,
discharges to waters, the generation, handling, storage, transportation,
disposal of hazardous substances and other materials and health and safety
matters. Laws protecting the environment generally have become more stringent
than in the past and are expected to continue to do so. Environmental laws and
regulations typically impose "strict liability," which means that in some
situations the Company could be exposed to liability for cleanup costs and
"toxic tort" or other damages as a result of conduct of the Company that was
lawful at the time it occurred or conduct of, or conditions caused by, prior
operators or other third parties, regardless of fault on the part of the
Company. The Company believes it is in substantial compliance with all
environmental standards applicable to its operations. However, there can be no
assurance that cleanup costs, natural resource damages, criminal sanctions,
"toxic tort" or other damages arising as a result of environmental laws and
costs associated with complying with changes in environmental laws and
regulations will not be substantial and will not have a material adverse effect
on the Company's financial condition. There can be no assurance that more
stringent regulatory standards will not be established that might require
material capital expenditures to meet future environmental standards. From time
to time, claims have been made against the Company under environmental laws. See
"Business--Regulatory Matters."
 
YEAR 2000 ISSUE
 
   
    The Company has implemented a year 2000 plan to attempt to ensure that the
Company's computer systems and applications will function properly with respect
to years beyond 1999. Computer programs that have time-sensitive software may
not recognize dates beginning in the year 2000, which could result in
miscalculations or system failures. The Company is implementing its plan, as
part of the Company's overall upgrade of its management information systems
("MIS"), to attempt to ensure that its MIS and computer software are year 2000
compliant, but there can be no assurance that the plan will be completed
successfully or on a timely basis. The Company has no separate budget for year
2000 compliance. Failure to ensure that the Company's MIS and software are year
2000 compliant or to implement successfully new year 2000 compliant software
applications on a timely basis could have a material adverse effect on the
Company's business, results of operations and financial condition. As the
Company's MIS upgrade is implemented, the Company may identify assets that
present a risk of year 2000-related disruption. The Company does not currently
have a contingency plan with respect to the year 2000 issue if the MIS upgrade
is not completed or is delayed beyond the end of 1999. The ability of third
parties with whom the Company transacts business to address adequately their
year 2000 issue is outside the Company's control,
    
 
                                       11
<PAGE>
   
and the Company is discussing with its vendors and customers the possibility of
any year 2000 interface difficulties that may affect the Company. The failure of
the Company or of third parties with whom the Company transacts business to
address adequately, and in a timely manner, the year 2000 issue with respect to
such interfaces, or any year 2000-related disruption, could also have a material
adverse effect on the Company's business, results of operations and financial
condition. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations--Impact of the Year 2000 Issue."
    
 
ANTI-TAKEOVER PROVISIONS
 
    The shares beneficially owned by the Company's executive officers, directors
and affiliates, combined with the ability of the Board of Directors to issue
shares of preferred stock without further vote or action by the stockholders and
certain provisions contained in the Company's Restated Certificate of
Incorporation and Amended and Restated By-laws, may have the effect of
discouraging persons from pursuing a non-negotiated takeover of the Company and
preventing certain changes of control. The Company has adopted a stockholder
rights plan pursuant to which one preferred stock purchase right automatically
trades with each share of Common Stock and upon the occurrence of certain events
entitles the registered holder to purchase the Company's Series A Junior
Participating Preferred Stock. The rights are generally exercisable following a
non-negotiated acquisition of, or public announcement of intent to commence an
offer for, 20% or more of the outstanding Common Stock and, therefore, may have
an anti-takeover effect. In addition, Section 203 of the Delaware General
Corporation Law, which is applicable to the Company, contains provisions that
restrict certain business combinations with interested stockholders, which may
have the effect of inhibiting a non-negotiated merger or other business
combination involving the Company.
 
SHARES ELIGIBLE FOR FUTURE SALE
 
   
    Sales of substantial amounts of Common Stock in the public market after this
offering could adversely affect prevailing market prices for shares of Common
Stock. Of the 21,740,648 shares that will be outstanding after this Offering,
approximately 20,340,648 shares, including all of the shares offered hereby,
generally will be eligible for immediate sale in the public market. The
Company's directors and senior management team and certain of the Company's
principal stockholders beneficially owning an aggregate of 3,214,500 shares of
Common Stock (excluding outstanding stock options) after the Offering have
agreed not to, directly or indirectly, offer, sell, distribute or otherwise
dispose of any shares of Common Stock for a period of 90 days after the date of
this Prospectus without the prior written consent of Warburg Dillon Read LLC.
See "Underwriting." In addition, shares of Common Stock held by affiliates of
the Company are subject to the volume limitations and other restrictions of Rule
144 under the Securities Act. After this offering, the Company anticipates it
will also have outstanding employee and director options to purchase an
aggregate of 1,681,828 shares of Common Stock, which are covered by an effective
registration statement on Form S-8 and will also generally be freely tradeable
upon issuance, except to the extent held by affiliates or subject to the
foregoing transfer restrictions.
    
 
DISCLOSURE REGARDING FORWARD-LOOKING INFORMATION
 
    This Prospectus contains forward-looking statements within the meaning of
Section 27A of the Securities Act and Section 21E of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"). All statements other than historical
or current facts, including, without limitation, statements about the business,
financial condition, business strategy, plans and objectives of management and
prospects of the Company, are forward-looking statements. When used in this
Prospectus the words "anticipates," "believes," "estimates," "expects,"
"intends," "plans" and "predicts," and similar statements that a result or event
"should" occur and similar expressions as they relate to the Company or its
management, are intended to identify forward-looking statements. Although the
Company believes that the expectations reflected in the forward-looking
statements are reasonable, these expectations and the related statements
 
                                       12
<PAGE>
   
are not guarantees of future performance and are subject to risks, uncertainties
and other factors that could cause the actual results to differ materially from
those projected. These risks, uncertainties and other factors include, but are
not limited to, the ability to integrate MBCI and other acquisitions, the
ability to service indebtedness and obtain additional capital, industry
cyclicality, fluctuations in customer demand and other patterns, the ability to
make strategic activities accretive to net income, raw material availability and
pricing, seasonality and adverse weather conditions, competitive activity and
pricing pressure, changes in tax and other governmental rules and regulations
applicable to the Company, new technological developments, the year 2000 issue,
including year 2000 compliance by the Company and third parties with which the
Company does business, and general economic conditions affecting the
construction industry, as well as other risks detailed in this Prospectus and in
filings of the Company with the Commission. Certain of these risks and
uncertainties are beyond the ability of the Company to control and, in many
cases, the Company cannot predict the occurrence of these risks and
uncertainties. Should one or more of these risks or uncertainties materialize,
or should underlying assumptions prove incorrect, actual results may vary
materially from those stated. Important factors that could cause actual results
to differ materially from the Company's expectations are disclosed in "Risk
Factors" and elsewhere in this Prospectus. The Company expressly disclaims any
obligation to release publicly any updates or revisions to these forward-looking
statements to reflect any changes in its expectations.
    
 
                                       13
<PAGE>
                              THE MBCI ACQUISITION
 
    On May 4, 1998, NCI acquired all of the outstanding capital stock of Amatek
from BTR Australia Limited, an indirect wholly owned subsidiary of BTR plc, for
a purchase price of $600 million, including cash of $550 million. At the time of
the MBCI Acquisition, Amatek had no operations other than MBCI. In connection
with the MBCI Acquisition, NCI issued an aggregate of 1,400,000 unregistered
shares of Common Stock (with an approximate fair market value of $32.2 million)
at the closing to certain officers and employees of MBCI in exchange for their
future interests in MBCI's senior management incentive plan.
 
    NCI financed the MBCI Acquisition by obtaining a new $600 million credit
facility (the "Senior Credit Facility") from a syndicate of lenders. The Senior
Credit Facility consists of a $200 million five-year revolving credit facility
(the "Five-Year Revolver"), a $200 million five-year term loan facility (the
"Term Loan") and a $200 million 364-day revolving credit facility (the "364-Day
Revolver"). Borrowings under the Senior Credit Facility may also be used for
working capital and other general corporate purposes.
 
    The following table sets forth the estimated cash sources and uses of funds,
including transaction costs, for the MBCI Acquisition and the cost of the Common
Stock issued to MBCI officers and employees:
 
<TABLE>
<CAPTION>
                   SOURCES OF FUNDS                                         USES OF FUNDS
- ------------------------------------------------------  ------------------------------------------------------
                                                (IN MILLIONS)
<S>                                                     <C>
</TABLE>
 
<TABLE>
<S>                                   <C>
Cash................................  $    27.8
Senior Credit Facility:
  Term Loan.........................      200.0
  Five-Year Revolver................      140.0
  364-Day Revolver..................      200.0
Issuance of Common Stock(a).........       32.2
                                      ---------
    Total...........................  $   600.0
                                      ---------
                                      ---------
 
Cash purchase price.................  $   550.0
Estimated transaction costs.........       17.8
Issuance of Common Stock(a).........       32.2
                                      ---------
    Total...........................  $   600.0
                                      ---------
                                      ---------
</TABLE>
 
- ------------------------------
 
(a) Represents approximate fair market value of 1,400,000 unregistered shares of
    Common Stock.
 
                                USE OF PROCEEDS
 
   
    The net proceeds to the Company from the Offering (at an assumed public
offering price of $18.625 per share, the last reported sale price on the NYSE on
September 1, 1998), after deducting underwriting discounts and estimated
expenses of the Offering, are estimated to be approximately $61.4 million. The
Company will not receive any of the proceeds from the sale of shares of Common
Stock by the Selling Stockholders. See "Principal and Selling Stockholders." The
Senior Credit Facility requires the Company to use the net proceeds to repay a
portion of the outstanding borrowings under the 364-Day Revolver. The Company
intends to repay the principal balance of the 364-Day Revolver remaining after
application of the net proceeds of this Offering with cash from operations or to
extend or convert the 364-Day Revolver to a three-year term note.
    
 
   
    The 364-Day Revolver is part of the Senior Credit Facility and matures on
May 3, 1999. The Company currently has outstanding $200.0 million under the
364-Day Revolver, which was borrowed to finance the MBCI Acquisition. If the
364-Day Revolver is not repaid by the Company or extended by the lenders, the
Company has the option to convert it to a three-year term note on the same
terms, but in no case longer than the maturity of the Five-Year Revolver. The
364-Day Revolver currently bears interest at LIBOR plus 2.00%. With application
of the net proceeds to repay a portion of the 364-Day Revolver, the Company
anticipates the LIBOR margin, which is adjusted based upon the ratio of funded
debt to EBITDA (as defined in the Senior Credit Facility), will decrease to
1.375%. See "The MBCI Acquisition" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital Resources."
    
 
                                       14
<PAGE>
                                 CAPITALIZATION
 
   
    The following table sets forth the capitalization of the Company (i) at July
31, 1998, and (ii) as adjusted as of July 31, 1998, to reflect the sale of
3,500,000 shares of Common Stock offered by the Company and the application of
the estimated net proceeds therefrom. This table should be read in conjunction
with "Use of Proceeds" and the consolidated financial statements of the
Company/NCI and Amatek and the notes thereto, which are included elsewhere in
this Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                                                                                 JULY 31, 1998
                                                                                             ----------------------
                                                                                              ACTUAL    AS ADJUSTED
                                                                                             ---------  -----------
                                                                                                  (UNAUDITED)
                                                                                                 (IN MILLIONS)
<S>                                                                                          <C>        <C>
Total debt, including current portion:
  Senior Credit Facility:
    Term Loan..............................................................................  $   200.0   $   200.0
    Five-Year Revolver.....................................................................       98.4        98.4
    364-Day Revolver.......................................................................      200.0       138.6
  Other debt...............................................................................  $     1.7         1.7
                                                                                             ---------  -----------
      Total debt, including current portion................................................      500.1       438.7
                                                                                             ---------  -----------
Shareholders' equity:
  Preferred Stock, $1.00 par value; 1,000,000 shares authorized; no shares outstanding.....         --          --
  Common Stock, $0.01 par value; 25,000,000 shares authorized; 18,034,482 issued and
    outstanding actual; 21,720,648 issued and outstanding as adjusted(1)...................        0.2         0.2
  Additional paid-in capital...............................................................       89.1       150.5
  Retained earnings........................................................................      120.2       120.2
                                                                                             ---------  -----------
  Total shareholders' equity...............................................................      209.5       270.9
                                                                                             ---------  -----------
  Total capitalization.....................................................................  $   709.6   $   709.6
                                                                                             ---------  -----------
                                                                                             ---------  -----------
</TABLE>
    
 
- ------------------------
 
   
(1) The actual number of shares issued and outstanding excludes (i) 1,887,994
    shares issuable upon exercise of outstanding options, with a weighted
    average exercise price of $12.71 per share, under the Company's Employee
    Stock Option Plan as of July 31, 1998, and (ii) 100,250 shares issuable as
    of July 31, 1998, pursuant to a convertible debenture held by a member of
    the senior management team at a conversion price of $14.9625 per share. The
    as adjusted number of shares issued and outstanding (i) excludes 1,701,828
    shares issuable upon exercise of outstanding options or issued upon exercise
    of options after July 31, 1998, (ii) includes 186,166 shares to be issued
    upon the exercise of options by certain Selling Stockholders prior to the
    closing of Offering and (iii) excludes 100,250 shares issuable pursuant to
    the convertible debenture. See "Principal and Selling Stockholders."
    
 
                                       15
<PAGE>
                          PRICE RANGE OF COMMON STOCK
 
   
    The Common Stock began trading on the NYSE under the symbol "NCS" on August
13, 1998. The Common Stock previously traded on the Nasdaq National Market. The
following table sets forth, on a per share basis for the fiscal quarter ending
on the date indicated, after giving effect to the two-for-one stock split of the
Common Stock on July 23, 1998, the range of high and low closing sale prices for
the Common Stock as reported by the Nasdaq National Market or the NYSE, as
applicable.
    
 
   
<TABLE>
<CAPTION>
                                                                                                HIGH        LOW
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
FISCAL YEAR ENDED OCTOBER 31, 1996
  January 31................................................................................  $  14.315  $  10.500
  April 30..................................................................................     19.000     13.250
  July 31...................................................................................     19.250     11.750
  October 31................................................................................     17.565     10.875
FISCAL YEAR ENDED OCTOBER 31, 1997
  January 31................................................................................     18.750     13.375
  April 30..................................................................................     19.125     14.750
  July 31...................................................................................     18.940     12.750
  October 31................................................................................     19.875     16.750
FISCAL YEAR ENDED OCTOBER 31, 1998
  January 31................................................................................     19.782     16.875
  April 30..................................................................................     26.000     18.063
  July 31...................................................................................     32.250     23.125
  October 31 (through September 1, 1998)....................................................     27.375     17.750
</TABLE>
    
 
   
    On September 1, 1998, the closing price of the Common Stock as reported by
the NYSE was $18.625 per share. As of August 31, 1998, there were 190 holders of
record of the Common Stock. The Company believes there are approximately 7,500
beneficial holders of the Common Stock.
    
 
                                DIVIDEND POLICY
 
    The Company has not paid cash dividends on its Common Stock since its
inception. The Board of Directors does not anticipate payment of any cash
dividends in the foreseeable future and intends to continue its present policy
of retaining earnings for reinvestment in the operations of the Company. The
Senior Credit Facility prohibits the payment of cash dividends.
 
                                       16
<PAGE>
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
   
    The following Unaudited Pro Forma Condensed Combined Financial Statements
(the "Pro Forma Financial Statements") are based on the historical consolidated
financial statements of the Company/NCI and of Amatek, and the notes thereto,
included elsewhere in this Prospectus.
    
 
   
    The Unaudited Pro Forma Condensed Consolidated Statements of Income for the
year ended October 31, 1997, the nine months ended July 31, 1998, and the
12-month period ended July 31, 1998, give effect to the MBCI Acquisition as if
it had occurred on November 1, 1996. Because Amatek had a fiscal year ended
December 31, the unaudited pro forma financial information presented for the
year ended October 31, 1997, the nine months ended July 31, 1998, and the
12-month period ended July 31, 1998, includes financial information of Amatek
for the year ended December 31, 1997, the six months ended March 31, 1998 and
the nine-month period ended March 31, 1998, respectively. The Company's
consolidated results of operations for the nine months ended July 31, 1998
reflect NCI's operations prior to the MBCI Acquisition and combined NCI and MBCI
operations for the third quarter of fiscal 1998. The Company's unaudited
consolidated balance sheet as of July 31, 1998 gives effect to the MBCI
Acquisition and no pro forma adjustments are required.
    
 
    The unaudited pro forma adjustments are based upon available information and
upon certain assumptions and estimates that the Company believes are reasonable.
The MBCI Acquisition has been accounted for using the purchase method of
accounting. A final determination of required purchase accounting adjustments,
including the allocation of the purchase price to the assets acquired and
liabilities assumed based on their respective fair values, has not yet been
made. Accordingly, the purchase accounting adjustments reflected in the
unaudited pro forma information are preliminary and have been made solely for
purposes of developing such information. The Company's management believes,
however, that the unaudited pro forma adjustments and the underlying assumptions
and estimates reasonably present the significant effects of the transactions
reflected thereby and that any subsequent changes in the underlying assumptions
and estimates will not materially affect the Pro Forma Financial Statements.
 
    The Pro Forma Financial Statements do not purport to represent what the
Company's financial position or results of operations actually would have been
had such transaction occurred on the dates indicated or to project the Company's
financial position or results of operation for any future date or period.
Furthermore, the Pro Forma Financial Statements do not reflect changes that may
occur as the result of post-acquisition activities and other matters.
 
                                       17
<PAGE>
   
                           NCI BUILDING SYSTEMS, INC.
    
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
 
   
<TABLE>
<CAPTION>
                                                                   TWELVE MONTHS ENDED OCTOBER 31, 1997
                                                         --------------------------------------------------------
                                                               HISTORICAL           PRO FORMA
                                                         ----------------------    ACQUISITION       PRO FORMA
                                                            NCI         AHI        ADJUSTMENTS       COMBINED
                                                         ----------  ----------  ---------------  ---------------
                                                                (IN THOUSANDS, EXCEPT FOR PER SHARE DATA)
<S>                                                      <C>         <C>         <C>              <C>
Revenue................................................  $  407,751  $  407,967  $     --         $   815,718
Cost of sales..........................................     299,407     312,329        --             611,736(C)
                                                         ----------  ----------  ---------------  ---------------
Gross profit...........................................     108,344      95,638        --             203,982
Operating expenses.....................................      66,055      36,637        9,825(D)       108,771(C)
                                                                                      (3,746)(D)
                                                         ----------  ----------  ---------------  ---------------
Income from operations.................................      42,289      59,001       (6,079)          95,211
 
Equity income in DOUBLECOTE............................      --              83        --                  83
Nonrecurring gain......................................      --           3,284        --               3,284
Interest expense.......................................        (163)     --          (42,050)(E)      (44,377)
                                                                                      (2,164)(E)
 
Other income...........................................       1,999       2,019       (1,390)(F)        2,628
                                                         ----------  ----------  ---------------  ---------------
Income (loss) before taxes.............................      44,125      64,387      (51,683)          56,829
Provision for income taxes.............................      16,238      24,647      (15,488)(G)       25,397
                                                         ----------  ----------  ---------------  ---------------
Net income.............................................  $   27,887  $   39,740  $   (36,195)     $    31,432
                                                         ----------  ----------  ---------------  ---------------
                                                         ----------  ----------  ---------------  ---------------
Net income per share:
  Basic................................................  $     1.73      --            --         $      1.79
                                                         ----------                               ---------------
                                                         ----------                               ---------------
  Diluted..............................................  $     1.64      --            --         $      1.70
                                                         ----------                               ---------------
                                                         ----------                               ---------------
Weighted average number of common shares:
  Basic................................................      16,127      --            1,400(B)        17,527
  Diluted..............................................      17,085      --            1,400(B)        18,485
</TABLE>
    
 
   See Accompanying Notes to Unaudited Pro Forma Condensed Combined Financial
                                  Statements.
 
                                       18
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
 
   
<TABLE>
<CAPTION>
                                                                     NINE MONTHS ENDED JULY 31, 1998
                                                         --------------------------------------------------------
                                                               HISTORICAL           PRO FORMA
                                                         ----------------------    ACQUISITION       PRO FORMA
                                                            NCI         AHI        ADJUSTMENTS       COMBINED
                                                         ----------  ----------  ---------------  ---------------
                                                                (IN THOUSANDS, EXCEPT FOR PER SHARE DATA)
<S>                                                      <C>         <C>         <C>              <C>
Revenue................................................  $  422,219  $  195,695  $     --         $   617,914
Cost of sales..........................................     309,452     153,306        --             462,758(C)
                                                         ----------  ----------  ---------------  ---------------
Gross profit...........................................     112,767      42,389        --             155,156
 
Operating expenses.....................................      64,084      19,458        4,913(D)        86,602(C)
                                                                                      (1,853)(D)
Nonrecurring acquisition expenses......................       2,060      --            --               2,060
                                                         ----------  ----------  ---------------  ---------------
Income from operations.................................      46,623      22,931       (3,060)          66,494
 
Equity income in DOUBLECOTE............................      --              14        --                  14
Nonrecurring gain......................................      --           3,284        --               3,284
Interest expense.......................................     (10,307)     --          (21,025)(E)      (32,414)
                                                                                      (1,082)(E)
 
Other income...........................................       2,424         761         (695)(F)        2,490
                                                         ----------  ----------  ---------------  ---------------
 
Income (loss) before taxes.............................      38,740      26,990      (25,862)          39,868
Provision for income taxes.............................      15,194       9,763       (7,751)(G)       17,206
                                                         ----------  ----------  ---------------  ---------------
Net income.............................................  $   23,546  $   17,227  $   (18,111)     $    22,662
                                                         ----------  ----------  ---------------  ---------------
                                                         ----------  ----------  ---------------  ---------------
 
Net income per share:
  Basic................................................  $     1.39      --            --         $      1.27
                                                         ----------                               ---------------
                                                         ----------                               ---------------
  Diluted..............................................  $     1.31      --            --         $      1.20
                                                         ----------                               ---------------
                                                         ----------                               ---------------
Weighted average number of common shares:
  Basic................................................      16,930      --              933(B)        17,863
  Diluted..............................................      17,965      --              933(B)        18,898
</TABLE>
    
 
   See Accompanying Notes to Unaudited Pro Forma Condensed Combined Financial
                                  Statements.
 
                                       19
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
 
   
<TABLE>
<CAPTION>
                                                                    TWELVE MONTHS ENDED JULY 31, 1998
                                                         --------------------------------------------------------
                                                               HISTORICAL           PRO FORMA
                                                         ----------------------    ACQUISITION       PRO FORMA
                                                            NCI         AHI        ADJUSTMENTS       COMBINED
                                                         ----------  ----------  ---------------  ---------------
                                                                (IN THOUSANDS, EXCEPT FOR PER SHARE DATA)
<S>                                                      <C>         <C>         <C>              <C>
Revenue................................................  $  542,974  $  306,074  $     --         $   849,048
Cost of sales..........................................     397,741     238,502        --             636,243(C)
                                                         ----------  ----------  ---------------  ---------------
Gross profit...........................................     145,233      67,572        --             212,805
Operating expenses.....................................      82,217      29,011        7,369(D)       115,703(C)
                                                                                      (2,894)(D)
Nonrecurring acquisition expenses......................       2,060      --            --               2,060
                                                         ----------  ----------  ---------------  ---------------
Income from operations.................................      60,956      38,561       (4,475)          95,042
 
Equity income in DOUBLECOTE............................      --               7        --                   7
Nonrecurring gain......................................      --           3,284        --               3,284
Interest expense.......................................     (10,345)     --          (31,538)(E)      (43,506)
                                                                                      (1,623)(E)
 
Other income...........................................       3,172       1,648       (1,043)(F)        3,777
                                                         ----------  ----------  ---------------  ---------------
Income (loss) before taxes.............................      53,783      43,500      (38,679)          58,604
Provision for income taxes.............................      20,655      16,467      (11,585)(G)       25,537
                                                         ----------  ----------  ---------------  ---------------
Net income.............................................  $   33,128  $   27,033  $   (27,094)     $    33,067
                                                         ----------  ----------  ---------------  ---------------
                                                         ----------  ----------  ---------------  ---------------
Net income per share:
  Basic................................................  $     1.98      --            --         $      1.86
                                                         ----------                               ---------------
                                                         ----------                               ---------------
  Diluted..............................................  $     1.87      --            --         $      1.76
                                                         ----------                               ---------------
                                                         ----------                               ---------------
Weighted average number of common shares:
  Basic................................................      16,756      --            1,050(B)        17,806
  Diluted..............................................      17,778      --            1,050(B)        18,828
</TABLE>
    
 
   See Accompanying Notes to Unaudited Pro Forma Condensed Combined Financial
                                  Statements.
 
                                       20
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
                     NOTES TO UNAUDITED PRO FORMA CONDENSED
 
                         COMBINED FINANCIAL STATEMENTS
 
   
(A) BASIS OF PRESENTATION--The Unaudited Pro Forma Condensed Combined Financial
    Statements are presented to give pro forma effect to the acquisition of
    Amatek Holdings, Inc. and Subsidiaries (AHI).
    
 
   
    The purchase method of accounting has been used in preparing the Unaudited
    Pro Forma Condensed Combined Financial Statements of NCI Building Systems,
    Inc. (the Company) with respect to the acquisition of AHI. The Unaudited Pro
    Forma Condensed Combined Statements of Income for the nine months ended July
    31, 1998 and fiscal year ended October 31, 1997 combine the results of
    operations for the Company's nine months ended July 31, 1998 and fiscal year
    ended October 31, 1997 with AHI's results for the six months ended March 31,
    1998 and fiscal year ended December 31, 1997, respectively. The Unaudited
    Pro Forma Condensed Combined Statement of Income for the 12 months ended
    July 31, 1998 combines the results of operations for the Company's 12 months
    ended July 31, 1998 with AHI's results for the nine months ended March 31,
    1998. AHI's results of operations for the three months ended March 31, 1998
    have been restated to reflect adjustments to revenues and cost of sales of
    $2.7 million (related to customer credit memos) and $1.0 million (related to
    an inventory write-off of scrap metal), respectively, which were taken by
    AHI in April 1998. The Unaudited Pro Forma Condensed Combined Statements of
    Income give effect to the AHI acquisition as if it had occurred on November
    1, 1996. Purchase accounting values have been assigned on a preliminary
    basis and will be adjusted upon the completion of a valuation study.
    Management does not expect such adjustments to be material.
    
 
   
    Due to the different fiscal year ends of the Company and AHI as discussed
    above, AHI's results of operations for the three months ended December 31,
    1997 are included in both the Unaudited Pro Forma Condensed Combined
    Statements of Income for the nine months ended July 31, 1998 and fiscal year
    ended October 31, 1997, and AHI's results of operations for the month ended
    April 30, 1998 are excluded from the Unaudited Pro Forma Condensed Combined
    Statements of Income for the nine months ended July 31, 1998 and the 12
    months ended July 31, 1998. AHI's revenues and net income for the three
    months ended December 31, 1997 were $111.5 million and $13.6 million,
    respectively, which includes a nonrecurring pre-tax gain of $3.3 million
    from insurance recoveries related to a plant fire. AHI's revenues and net
    loss for the month ended April 30, 1998 were $37.2 million and $4.0 million,
    respectively, which net loss includes a nonrecurring pre-tax charge related
    to the acquisition of $8.6 million for payments to certain AHI management
    required due to change in control of AHI.
    
 
   
    In June 1998, the Company's Board of Directors approved a two-for-one split
    of the Common Stock effective for stockholders of record on July 8, 1998.
    Share and per share amounts have been restated to reflect the stock split.
    
 
   
(B) To reflect the purchase of AHI for consideration of $550.0 million in cash
    plus 1,400,000 shares of Company common stock valued at $32.2 million issued
    to AHI employees to replace the management incentive plan in place at AHI.
    In addition, there are estimated to be $17.8 million in transaction costs.
    Goodwill has been preliminarily calculated as follows:
    
 
   
<TABLE>
<CAPTION>
<S>                                                     <C>
Purchase Price:
  Cash................................................  $  550,000
  Equity issued.......................................      32,200
Estimated transaction costs...........................      17,800
Less: Net assets acquired.............................     207,000
                                                        ----------
Goodwill..............................................  $  393,000
</TABLE>
    
 
                                       21
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
                     NOTES TO UNAUDITED PRO FORMA CONDENSED
 
                   COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
   
(C) Anticipated synergies and cost savings resulting from internal rather than
    third party coating of NCI products, plant consolidations, sales and
    marketing consolidation, purchasing efficiencies and administrative cost
    savings and efficiencies of approximately $15 million annually have not been
    reflected in the above Unaudited Pro Forma Condensed Combined Financial
    Statements.
    
 
   
(D) To record additional amortization expense associated with the goodwill
    generated from the AHI acquisition (assigned useful life of 40 years),
    offset by elimination of a management incentive charge incurred by AHI on a
    historical basis.
    
 
   
(E) To record additional interest expense and amortization of debt issuance
    costs related to debt incurred in connection with the acquisition of AHI.
    
 
   
(F) To eliminate daily cash investment interest income for the portion of the
    Company's excess cash utilized for the acquisition.
    
 
   
(G) To record the tax effect on the pro forma adjustments.
    
 
                                       22
<PAGE>
             SELECTED HISTORICAL CONSOLIDATED FINANCIAL INFORMATION
 
   
THE COMPANY/NCI
    
 
   
    The selected historical consolidated financial information presented below
for, and as of the end of, each of the years in the five-year period ended
October 31, 1997, is derived from NCI's audited consolidated financial
statements. The selected historical consolidated financial information for, and
as of the end of, the nine months ended July 31, 1997 and 1998, is derived from
the unaudited consolidated financial statements of the Company. In the opinion
of management, the unaudited results of operations for, and as of the end of,
the nine months ended July 31, 1997 and 1998, include all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation of such information. The unaudited consolidated results of
operations for the interim periods are not necessarily indicative of the results
that may be expected for the full fiscal year. The selected historical financial
information is not necessarily indicative of the future results of operations.
The following financial information should be read in conjunction with and is
qualified by reference to "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and the Company's/NCI's consolidated
historical financial statements and notes thereto included elsewhere in this
Prospectus.
    
 
   
<TABLE>
<CAPTION>
                                             NINE MONTHS
            YEAR ENDED OCTOBER 31,          ENDED JULY 31,
    --------------------------------------  --------------
     1993    1994    1995    1996    1997    1997    1998
    ------  ------  ------  ------  ------  ------  ------
             (IN MILLIONS, EXCEPT PER SHARE DATA)
  <C>       <C>     <C>     <C>     <C>     <C>     <C>
STATEMENT
  OF
  INCOME
  DATA:
Sales... $134.5 $167.8 $234.2 $332.9 $407.7 $287.0  $422.2
Cost
  of
  sales...   99.8  124.1  169.8  241.4  299.4  211.1  309.4
    ------  ------  ------  ------  ------  ------  ------
Gross
profit...   34.7   43.6   64.4   91.5  108.3   75.9  112.8
Operating
expenses...   25.1   28.2   38.1   53.1   66.0   47.9   64.1
Nonrecurring
 acquisition
 expenses(1)...   --   --   --   --   --      --       2.1
    ------  ------  ------  ------  ------  ------  ------
Income
  from
  operations...    9.6   15.4   26.3   38.4   42.3   28.0   46.6
Interest
expense...    0.2    0.1    0.1    0.1    0.2    0.1   10.3
Other
income...    0.4    0.7    0.8    1.6    2.0    1.2    2.4
    ------  ------  ------  ------  ------  ------  ------
Income
before
income
taxes...    9.8   16.0   27.0   39.9   44.1   29.1    38.7
Provision
  for
  income
 taxes...    3.5    5.7   10.0   15.1   16.2   10.8   15.2
    ------  ------  ------  ------  ------  ------  ------
Net
income... $  6.3 $ 10.3 $ 17.0 $ 24.8 $ 27.9 $ 18.3 $ 23.5
    ------  ------  ------  ------  ------  ------  ------
    ------  ------  ------  ------  ------  ------  ------
Net
income
  per
share:
  Basic... $ 0.52 $ 0.82 $ 1.36 $ 1.60 $ 1.73 $ 1.14 $ 1.39
    ------  ------  ------  ------  ------  ------  ------
    ------  ------  ------  ------  ------  ------  ------
  Diluted... $ 0.48 $ 0.77 $ 1.26 $ 1.51 $ 1.64 $ 1.08 $ 1.31
    ------  ------  ------  ------  ------  ------  ------
    ------  ------  ------  ------  ------  ------  ------
Weighted
 average
  number
  of
  common
 shares:
  Basic...   12.2   12.4   12.5   15.5   16.1   16.1   16.9
  Diluted...   13.2   13.4   13.5   16.5   17.1   17.0   18.0
 
OTHER
FINANCIAL
  DATA:
EBITDA... $ 11.6 $ 18.3 $ 30.3 $ 45.8 $ 52.2 $ 35.1 $ 60.1
Capital
expenditures...    8.2    5.9    5.8   10.3   11.3    5.4    7.4
 
BALANCE
  SHEET
  DATA
  (AT
  END
  OF
  PERIOD):
Working
capital... $ 15.5 $ 16.9 $ 31.7 $ 52.0 $ 76.7 $ 67.9 $ 68.8
Property,
  plant
  and
  equipment,
  net...   16.1   22.2   25.6   42.8   51.2   46.9   166.0
Total
assets...   46.7   63.4   83.1  158.3  196.3  185.9  809.6
Total
debt...    2.2    0.4    0.4    1.8    1.7     1.8   500.1
Shareholders'
  equity...   28.7   39.7   57.7  116.2  147.8  137.4  209.5
</TABLE>
    
 
- ------------------------
 
   
(1) Nonrecurring acquisition expenses in the third quarter of fiscal 1998 for
    severance and relocation expenses related to the consolidation of components
    sales and marketing functions, estimated costs associated with announced
    plant closures and consolidations and costs associated with the integration
    of product lines.
    
 
                                       23
<PAGE>
MBCI
 
    The selected historical consolidated financial information presented below
for, and as of the end of, each of the three years in the period ended December
31, 1997, is derived from the audited consolidated financial statements of
Amatek. The selected historical consolidated financial information for, and as
of the end of, (i) the two years ended December 31, 1994, and (ii) the three
months ended March 31, 1997 and 1998, is derived from the unaudited consolidated
financial statements of Amatek. In the opinion of management, the unaudited
results of operations for the three months ended March 31, 1997 and 1998,
include all adjustments, consisting only of normal recurring adjustments,
necessary for a fair presentation of such information. The unaudited results of
operations for the interim periods are not necessarily indicative of the results
that may be expected for the full fiscal year. The selected historical financial
information is not necessarily indicative of the future results of operations.
The following financial information should be read in conjunction with and is
qualified by reference to "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Results of Operations of MBCI" and Amatek's
historical consolidated financial statements and notes thereto included
elsewhere in this Prospectus.
 
   
<TABLE>
<CAPTION>
                                             THREE MONTHS
                                             ENDED MARCH
           YEAR ENDED DECEMBER 31,               31,
    --------------------------------------  --------------
     1993    1994    1995    1996    1997    1997    1998
    ------  ------  ------  ------  ------  ------  ------
                        (IN MILLIONS)
  <C>       <C>     <C>     <C>     <C>     <C>     <C>
STATEMENT
  OF
  INCOME
  DATA:
Sales... $226.5 $279.8 $315.7 $362.9 $408.0 $ 82.5  $ 84.2
Cost
  of
  sales...  170.8  209.4  234.0  271.3  312.4   63.9   68.9
    ------  ------  ------  ------  ------  ------  ------
Gross
profit...   55.7   70.4   81.7   91.6   95.6   18.6   15.3
Operating
expenses...   20.7   24.8   24.9   29.7   36.7    8.5    9.6
    ------  ------  ------  ------  ------  ------  ------
Income
  from
  operations...   35.0   45.6   56.8   61.9   58.9   10.1    5.7
Interest
 income,
  net...    0.1    0.7    1.4    1.9    2.0    0.3     0.3
Unusual/nonrecurring
  gain(1)...    0.0    0.0    0.0    0.0    3.3    0.0    0.0
Other
income
(expense)...    0.0    0.0   (1.3)   (0.3)    0.1   (0.2)   (0.2)
    ------  ------  ------  ------  ------  ------  ------
Income
before
income
taxes...   35.1   46.3   56.9   63.5   64.3   10.2     5.8
Provisions
 (benefit)
  for
  income
  taxes...   14.5   20.5   23.0   24.9   24.6    4.1    2.2
    ------  ------  ------  ------  ------  ------  ------
Net
income... $ 20.6 $ 25.8 $ 33.9 $ 38.6 $ 39.7 $  6.1 $  3.6
    ------  ------  ------  ------  ------  ------  ------
    ------  ------  ------  ------  ------  ------  ------
OTHER
FINANCIAL
  DATA:
EBITDA... $ 38.3 $ 49.9 $ 61.0 $ 69.0 $ 71.2 $ 11.8 $  9.3
Capital
expenditures...    5.2   13.1   12.5   21.1   27.2    5.8    1.6
 
BALANCE
  SHEET
  DATA
  (AT
  END
  OF
  PERIOD):
Working
capital... $ 20.4 $ 27.0 $ 28.0 $ 35.0 $ 72.3 $ 52.0 $ 76.1
Property,
  plant
  and
  equipment,
  net...   44.9   54.7   63.2   84.7  104.1   89.0   104.0
Total
assets...   96.6  137.8  166.9  220.5  249.8  210.7  243.2
Total
debt...    0.0    0.0    0.0    0.0    0.0     0.0     0.0
Stockholder's
  equity...   66.4   93.7  126.5  165.0  204.8  171.1  208.4
</TABLE>
    
 
- ------------------------------
 
   
(1) Unusual/nonrecurring gain reflects insurance recoveries for fire damage to
    Lubbock, Texas plant in 1997.
    
 
                                       24
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
   
    THE FOLLOWING DISCUSSION AND ANALYSIS SHOULD BE READ IN CONJUNCTION WITH THE
COMPANY'S/NCI'S AND AMATEK'S CONSOLIDATED FINANCIAL STATEMENTS AND THE NOTES
THERETO INCLUDED ELSEWHERE IN THIS PROSPECTUS.
    
 
   
    The Company is one of North America's largest integrated manufacturers of
metal products for the building industry, with 38 manufacturing and distribution
facilities located in 18 states and Mexico. The Company sells metal components
as well as complete, pre-engineered metal building systems, offering one of the
most extensive metal product lines in the building industry with well-recognized
brand names. The Company's consolidated results of operations for the nine
months ended July 31, 1998 reflect NCI's operations prior to the MBCI
Acquisition and combined NCI and MBCI operations for the third quarter of fiscal
1998. Following completion of the MBCI Acquisition, the Company immediately
began integrating NCI's and MBCI's operations by eliminating overlapping costs
and consolidating NCI's and MBCI's components operations, including sales and
marketing functions. This consolidation has resulted in the closure of one plant
and the reduction in operations at two other plants currently targeted for
closure by the end of 1999. As a result of the MBCI Acquisition, the Company's
product mix has shifted from metal building systems to metal components with
components sales constituting two-thirds of sales in the third quarter of fiscal
1998 as compared to one-third of sales in the third quarter of fiscal 1997.
    
 
   
RESULTS OF OPERATIONS OF THE COMPANY/NCI
    
 
    Prior to the MBCI Acquisition, NCI designed, manufactured and marketed
pre-engineered metal building systems, self-storage buildings, overhead doors,
metal home framing systems and various metal components for metal buildings for
commercial, industrial, agricultural, governmental, community service and
residential uses. NCI marketed these products nationwide both through authorized
builder networks totaling over 1,200 builders and a direct sales force under
several brand names, including "Metallic Buildings," "Mid-West Steel Buildings,"
"A & S Buildings," "NCI Building Components," "All American Systems," "Steel
Systems," "DBCI" and "Mesco."
 
    The following table presents, as a percentage of sales, certain selected
consolidated financial data of NCI for the periods indicated:
 
   
<TABLE>
<CAPTION>
                                                                                   NINE MONTHS
                                                              YEAR ENDED OCTOBER      ENDED
                                                                      31,            JULY 31,
                                                              -------------------  ------------
                                                              1995   1996   1997   1997   1998
                                                              -----  -----  -----  -----  -----
<S>                                                           <C>    <C>    <C>    <C>    <C>
Sales.......................................................  100.0% 100.0% 100.0% 100.0% 100.0%
Cost of sales...............................................   72.5   72.5   73.4   73.6   73.3
                                                              -----  -----  -----  -----  -----
Gross profit................................................   27.5   27.5   26.6   26.4   26.7
Operating expenses..........................................   16.3   16.0   16.3   16.7   15.2
Nonrecurring acquisition expenses...........................    0.0    0.0    0.0    0.0    0.5
                                                              -----  -----  -----  -----  -----
Income from operations......................................   11.2   11.5   10.3    9.7   11.0
Interest expense............................................    0.0    0.0    0.0    0.0    2.4
Other income................................................    0.4    0.5    0.5    0.4    0.6
                                                              -----  -----  -----  -----  -----
Income before income taxes..................................   11.6   12.0   10.8   10.1    9.2
Provision for income taxes..................................    4.3    4.5    4.0    3.7    3.6
                                                              -----  -----  -----  -----  -----
Net income..................................................    7.3%   7.5%   6.8%   6.4%   5.6%
                                                              -----  -----  -----  -----  -----
                                                              -----  -----  -----  -----  -----
</TABLE>
    
 
   
NINE MONTHS ENDED JULY 31, 1998 COMPARED TO NINE MONTHS ENDED JULY 31, 1997
    
 
   
    Sales for the nine months ended July 31, 1998 increased by $135.2 million,
or 47%, over the same period a year ago. The MBCI Acquisition accounted for
substantially all of this increase. The Company
    
 
                                       25
<PAGE>
   
believes that sales for the nine-month period without the inclusion of MBCI
would have increased by approximately 6%.
    
 
   
    Gross profit for the nine-month period increased by $36.9 million, or 49%,
compared to the same period a year ago. As a percentage of sales, gross profit
was 26.7% in the nine-month period in fiscal 1998 compared to 26.4% in the same
period in the prior year. This increase in gross profit percentage resulted from
slightly lower raw material costs in the current period, improved plant
utilization and better cost controls, which improved plant efficiencies.
    
 
   
    Operating expenses increased by $16.2 million, or 34%, for the nine months
ended July 31, 1998, compared to the same period last year. The dollar increase
was primarily due to the inclusion of MBCI for the third quarter of fiscal 1998.
As a percentage of sales, operating expenses were 15.2% and 16.7%, respectively,
for the nine-month periods ended July 31, 1998 and 1997. The decrease as a
percentage of sales resulted from the absence of engineering and drafting costs
in MBCI's operations (which are exclusively components operations), which
lowered the overall cost of engineering and drafting from 3.4% of sales in the
nine months ended July 31, 1997 to 2.6% in the nine months ended July 31, 1998.
The remainder of this improvement resulted primarily from the consolidation in
the third quarter of fiscal 1998 of the sales and marketing functions in
components sales for both NCI and MBCI and the elimination of some overlapping
costs.
    
 
   
    Nonrecurring acquisition expenses of $2.1 million in the third quarter of
fiscal 1998 represented the one-time cost of severance and relocation expenses
related to the consolidation of components sales and marketing functions,
estimated costs associated with announced plant closures and consolidations and
costs associated with the integration of product lines.
    
 
   
    Interest expense increased to $10.3 million for the nine months ended July
31, 1998 compared to $125,000 in the fiscal 1997 period. As discussed above,
this increase resulted from borrowings of $540.0 million on May 4, 1998 to
finance the MBCI Acquisition. The Company had outstanding total debt of $500.1
million at July 31, 1998.
    
 
   
    Income before income taxes increased by $9.7 million, or 33%. Income before
income taxes increased at a slower rate than sales due to the increase in
interest expense, amortization of goodwill expense and nonrecurring acquisition
expenses recognized in the third quarter of fiscal 1998.
    
 
   
    Provision for income taxes increased by 41% in the nine-month period ended
July 31, 1998, reflecting an effective tax rate of 39.2% compared to an
effective tax rate of 37.1% in the nine-month period ended July 31, 1997. The
increase in effective tax rate was due to the nondeductible amortization of $2.5
million of goodwill expense associated with the MBCI Acquisition.
    
 
FISCAL 1997 COMPARED TO FISCAL 1996
 
    Sales in fiscal 1997 increased by $74.9 million, or 22%, compared to fiscal
1996. The acquisition of the facilities of Carlisle Engineered Metals ("ECI") in
February 1997 and the inclusion of Mesco Metal Buildings Division ("Mesco") for
the whole fiscal year 1997 accounted for approximately $23 million of this
increase. The remaining increase of approximately $50 million, or 15%, resulted
from growth of sales in NCI's door division due to geographic expansion,
building systems sales growth due to increased builder recruitment and a full
year's operation of NCI's Atwater plant and growth in NCI's components division.
 
   
    Gross profit increased by $16.8 million, or 18%, compared to fiscal 1996.
Gross profit dollars increased at a slower rate than sales due to price
competition earlier in the year, bad weather in the first half of 1997, which
impacted plant efficiencies, and slightly higher raw material costs. In
addition, growth in the component and door sales, which have lower gross margins
than building systems, impacted gross profit. As a result, the gross profit
percentage in 1997 declined from 27.5% to 26.6%.
    
 
                                       26
<PAGE>
    Operating expenses increased by $13.0 million, or 24%, compared to fiscal
1996. These expenses increased at a slightly higher rate than sales due to the
additional expenses resulting from the acquisition of ECI, additional sales
expense to support the marketing of steel frame housing and continued geographic
expansion of NCI's sales and marketing effort.
 
   
    Interest expense increased $55,000 in fiscal 1997 as a result of the $1.5
million debenture issued in April 1996 being outstanding all of 1997. Other
income, which consists primarily of interest income, increased by $413,000 in
fiscal 1997. This increase was the result of a higher level of cash invested
during the year.
    
 
    Provision for income taxes increased by 8% in fiscal 1997 and decreased as a
percent of sales from 4.5% in fiscal 1996 to 4.0% in fiscal 1997. During the
year, NCI changed the corporate structure of certain operating units which
reduced the amount of state income paid by these units.
 
FISCAL 1996 COMPARED TO FISCAL 1995
 
    Sales in fiscal 1996 increased by $98.7 million, or 42%, compared to fiscal
1995. The acquisitions of Doors and Buildings Components, Inc. ("DBCI") in
November 1995 and Mesco from Anderson Industries, Inc. in April 1996 accounted
for $58.7 million of this increase. Excluding the fiscal 1996 sales of these two
acquisitions, sales increased in fiscal 1996 by 17% compared to the prior year.
This growth resulted from increased market penetration by NCI in the metal
building market, expansion into the western United States with the opening of a
new plant in California and growth of NCI's components division.
 
   
    Gross profit increased in fiscal 1996 by $27.1 million, or 42%, compared to
fiscal 1995. This increase was in line with the increase in sales experienced
for the year. Gross profit percentage of 27.5% was the same as the margin
achieved in fiscal 1995. Slight increases in raw material costs during the year
were offset by spreading fixed manufacturing costs over a higher sales base.
    
 
    Operating expenses increased $15.0 million, or 39%, compared to fiscal 1995.
Selling, general and administrative expenses increased slightly faster than
sales due to the establishment of a west coast sales function to support the new
plant location and additional expenses resulting from the two acquisitions made
in fiscal 1996. Engineering expenses as a component of operating expenses
increased at a slower rate than sales due to increased sales of products which
require less engineering effort such as DBCI products and components.
 
    Interest expense increased by $52,000 as a result of the issuance of a $1.5
million subordinated debenture in connection with the acquisition of Mesco.
Other income, which consists primarily of interest income, increased by $764,000
in fiscal 1996 compared to fiscal 1995. This increase resulted primarily from
the higher level of cash invested during the year and slightly higher average
rates of return on invested cash.
 
    Provision for income taxes increased by 50.4% in fiscal 1996 and increased
as a percent of sales from 4.3% to 4.5%. This increase was due to the increase
in state income taxes in fiscal 1996 compared to the prior year.
 
RESULTS OF OPERATIONS OF MBCI
 
    Prior to the MBCI Acquisition, MBCI designed, manufactured, sold and
distributed metal components for the building industry, including one of the
widest selections of roofs, walls, fascia, mansard and various trim accessories
for commercial, industrial, agricultural and residential construction uses. In
addition, MBCI processed its own hot roll coil metal for use in metal components
manufacturing, as well as processing hot roll coil and toll coating light gauge
metal for use by other parties in the manufacture of metal components and
numerous other products, including heating and air conditioning systems, water
heaters, lighting fixtures and office furniture. MBCI marketed its products
nationwide through a direct
 
                                       27
<PAGE>
sales force under several brand names, including "Metal Building Components,"
"American Building Components," "Metal Coaters of Georgia," "Metal-Prep" and
"DOUBLECOTE."
 
    The following table presents, as a percentage of sales, certain selected
consolidated financial data of MBCI for the periods indicated:
 
   
<TABLE>
<CAPTION>
                                                                                      THREE
                                                                                      MONTHS
                                                              YEAR ENDED DECEMBER     ENDED
                                                                      31,           MARCH 31,
                                                              -------------------  ------------
                                                              1995   1996   1997   1997   1998
                                                              -----  -----  -----  -----  -----
<S>                                                           <C>    <C>    <C>    <C>    <C>
Sales.......................................................  100.0% 100.0% 100.0% 100.0% 100.0%
Cost of sales...............................................   74.1   74.8   76.6   77.4   81.8
                                                              -----  -----  -----  -----  -----
Gross profit................................................   25.9   25.2   23.4   22.6   18.2
Operating expenses..........................................    7.9    8.2    9.0   10.4   11.4
                                                              -----  -----  -----  -----  -----
Income from operations......................................   18.0   17.1   14.5   12.2    6.8
Interest income, net........................................    0.4    0.5    0.5    0.3    0.3
Unusual/nonrecurring gain...................................    0.0    0.0    0.8    0.0    0.0
Other income (expense)......................................  (0.4)  (0.1)    0.0  (0.2)  (0.2)
                                                              -----  -----  -----  -----  -----
Income before income taxes..................................   18.0   17.5   15.8   12.3    6.9
Provision for income taxes..................................    7.2    6.9    6.0    5.0    2.6
                                                              -----  -----  -----  -----  -----
Net income..................................................   10.7%  10.6%   9.7%   7.4%   4.3%
                                                              -----  -----  -----  -----  -----
                                                              -----  -----  -----  -----  -----
</TABLE>
    
 
THREE MONTHS ENDED MARCH 31, 1998 COMPARED TO THREE MONTHS ENDED MARCH 31, 1997
 
   
    Sales for the three months ended March 31, 1998 increased by $1.7 million,
or 2%, from the same period in 1997. The additional revenues were attributable
to increased metal building components and hot roll coil sales. Light gauge
steel painting revenues declined 14% as major customers attempted to reduce
inventories. The increase in revenues was offset by an aggregate of $2.7 million
in credit memos written to customers in April 1998 to resolve invoices with
questioned or disputed items. Sales for the three months ended March 31, 1998
have been restated to reflect this subsequent adjustment.
    
 
   
    Gross profit decreased by $3.3 million, or 18%, in the first quarter of
1998, and decreased as a percentage of sales from 22.6% for the same period in
1997 to 18.2%. This decrease in gross profit resulted primarily from the
adjustment of $1.0 million resulting from an inventory write-off of partial
metal coils in 1998. Cost of sales for the three months ended March 31, 1998
have been restated to reflect this subsequent inventory adjustment. The decrease
in gross profit was also due to a change in product mix as higher margin steel
painting decreased as a percentage of total sales.
    
 
    Operating expenses increased $1.1 million, or 12%, for the first three
months of 1998 due to costs of opening new plants in the western United States
in 1997. These expenses were not offset by related sales, since the new plants
did not make a significant revenue contribution due to both the seasonality of
the business and limited operations in the period.
 
    Other income decreased slightly in the first three months of 1998 due to
losses in MBCI's DOUBLECOTE joint venture offset by interest income on advances
to DOUBLECOTE.
 
1997 COMPARED TO 1996
 
    Sales in 1997 increased by $45.1 million, or 12%, as MBCI furthered its
expansion into the western United States metal components market during the
year, opening plants in Boise, Idaho, Salt Lake City, Utah, and Phoenix,
Arizona. MBCI also expanded its architectural panel capacity in the Memphis,
Tennessee plant. Total metal components sales rose by $33.5 million, or 11%. The
largest increases came in commercial/industrial and agricultural products. Metal
coating and painting sales increased by $11.5 million, or 19%, as MBCI increased
its efforts to expand prepainted packaged coil sales. MBCI did not realize
 
                                       28
<PAGE>
significant revenues from the new metal components plants during the year as
markets were being developed.
 
    Gross profit increased by $4.1 million, or 4%, in 1997 compared to 1996. The
gross margin percentage declined from 25.2% in 1996 to 23.4% in 1997, primarily
because of competitive pressures in the metal components sector. The strength of
the construction market encouraged competition to add capacity and attempt to
expand market share with pricing. Metal coating and painting gross margins also
declined due to a change in product mix. Prepainted coil package sales, which
have lower gross margins than toll coil coating, increased as a percentage of
total metal coating and painting sales.
 
    Operating expenses increased by $7.0 million, or 24%, in 1997 compared to
1996 due primarily to plant additions in Utah, Idaho and Arizona. This expansion
into the western U.S. market required additional sales and management personnel
and related administrative costs.
 
    In February 1997, the Lubbock, Texas metal components plant sustained major
fire damage. The facility was rebuilt and resumed operations in July 1997.
Insurance recoveries over cost basis resulted in a nonrecurring gain of $3.3
million. Other income increased by $387,000 in 1997 based on positive results in
MBCI's DOUBLECOTE joint venture.
 
1996 COMPARED TO 1995
 
    MBCI's sales in 1996 increased by $47.1 million, or 15%, compared to 1995
with new facilities driving growth. Metal building construction did not
experience the dynamic growth that occurred in 1995, but shipments remained
strong. MBCI added a metal components plant in Adel, Georgia to service the
growing southeast market, primarily commercial/industrial. MBCI's Atlanta
facility, which had served the region before the addition of the Adel plant,
continued to run at near capacity due to strong demand. In April 1996, MBCI
purchased the operating assets of Steelco Metal Products ("Steelco"), a division
of Alta Industries, Ltd. for approximately $22 million. This acquisition was the
first step in expansion into the western U.S. market and provided a solid base
for future growth. MBCI took advantage of Steelco's strong reputation and loyal
customer base while improving efficiency through MBCI's aggressive, centralized
management style. The Steelco acquisition added $21.7 million in sales of metal
components in 1996. Metal coating and painting sales were at approximately the
same level as 1995 with seasonal capacity limiting growth.
 
    Gross profit increased by $9.9 million, or 12%, in 1996 compared to 1995.
Although competitive pricing in the metal components industry began to increase
in the last half of 1996, MBCI maintained a gross margin percentage in excess of
25%.
 
    Operating expenses increased by $4.8 million, or 19%, in 1996 compared to
1995, with a majority of the increase being attributable to the new plant and
the Steelco acquisition. As a percentage of sales, operating expenses increased
from 7.9% in 1995 to 8.2% in 1996.
 
    Other expense, which consisted of MBCI's equity in the losses of its
DOUBLECOTE joint venture, decreased by $1.0 million in 1996. This decrease was
the result of improved results of operations at DOUBLECOTE.
 
QUARTERLY RESULTS
 
    The metal components and metal building systems businesses, as well as the
construction industry in general, are seasonal in nature. Sales and shipments
normally are lower in the first calendar quarter of each year compared to the
other three quarters because of unfavorable weather conditions for construction
(particularly in the northern United States) and typical business planning
cycles affecting construction. This seasonality adversely affects the Company's
results of operations for the first two fiscal quarters.
 
                                       29
<PAGE>
   
    The following table sets forth selected unaudited quarterly financial
information for the Company/ NCI for the 1996 and 1997 fiscal years and the
first three quarters of fiscal 1998:
    
   
<TABLE>
<CAPTION>
                                                                        THREE MONTHS ENDED
                                --------------------------------------------------------------------------------------------------
                                             FISCAL 1996                             FISCAL 1997                   FISCAL 1998
                                -------------------------------------   -------------------------------------   ------------------
                                JAN. 31   APR. 30   JUL. 31   OCT. 31   JAN. 31   APR. 30   JUL. 31   OCT. 31   JAN. 31   APR. 30
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   --------
                                                             (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Sales.........................   $67.4     $72.1     $92.0    $101.4     $82.9     $91.7    $112.5    $120.8     $97.3     $ 95.3
Gross profit..................    17.4      19.5      25.5      29.1      22.4      23.7      29.8      32.5      25.4       26.6
Income before income taxes....     6.5       8.1      11.5      13.8       8.3       8.2      12.7      15.0       9.4       10.0
Net income....................     4.0       5.1       7.2       8.6       5.2       5.2       8.0       9.6       6.1        6.4
Net income per share--
  diluted.....................    0.27      0.30      0.43      0.52      0.31      0.31      0.47      0.56      0.35       0.37
 
<CAPTION>
 
                                JUL. 31
                                --------
 
<S>                             <C>
Sales.........................   $229.5
Gross profit..................     60.7
Income before income taxes....     19.3
Net income....................     11.1
Net income per share--
  diluted.....................     0.58
</TABLE>
    
 
    The following table sets forth selected unaudited quarterly financial
information for MBCI for 1996, 1997 and the first quarter of 1998.
 
   
<TABLE>
<CAPTION>
                                                                          THREE MONTHS ENDED
                                        ---------------------------------------------------------------------------------------
                                                        1996                                    1997                     1998
                                        -------------------------------------   -------------------------------------   -------
                                        MAR. 31   JUN. 30   SEP. 30   DEC. 31   MAR. 31   JUN. 30   SEP. 30   DEC. 31   MAR. 31
                                        -------   -------   -------   -------   -------   -------   -------   -------   -------
                                                                             (IN MILLIONS)
<S>                                     <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Sales.................................   $69.1     $92.3    $102.3     $99.2     $82.5    $103.6    $110.4    $111.5     $84.2
Gross profit..........................    17.6      23.5      25.7      24.7      18.6      24.8      25.2      27.1      15.3
Income before income taxes............    12.0      17.3      17.5      16.6      10.2      16.2      16.9      21.1       5.8
Net income............................     7.4      10.9      10.4       9.8       6.1      10.0      10.1      13.5       3.6
</TABLE>
    
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
    The Company had cash and cash equivalents of $4.5 million at July 31, 1998,
compared to $32.2 million at October 31, 1997. Working capital was $68.8 million
at July 31, 1998 and $76.7 million at October 31, 1997.
    
 
   
    MBCI had cash and cash equivalents of $1.3 million at March 31, 1998,
compared to $7.0 million at December 31, 1997. Working capital was $76.1 million
at March 31, 1998 and $72.3 million at December 31, 1997.
    
 
CASH FLOW
 
   
    The Company has historically funded its operations with cash flow from
operations, bank borrowings and the sale of Common Stock. Internal cash
generation has been aided, in the opinion of management, by a compensation
program under which bonuses are earned based on achieving specified return on
assets goals. This program encourages management of the balance sheet as well as
the income statement.
    
 
   
    The Company's net cash flow from operations increased to $51.6 million for
the nine months ended July 31, 1998 compared to $22.6 million for the same
nine-month period in 1997.
    
 
   
    NCI's net cash flow from operations increased to $24.5 million in fiscal
1997 from $28.6 million in fiscal 1996. MBCI's net cash flow from operations
decreased to $11.6 million in 1997 from $44.2 million in 1996. The decrease was
primarily the result of an $11.1 million increase in inventories, a $2.9 million
increase in trade receivables and a $12.3 million decrease in accounts payable
and accrued liabilities.
    
 
   
    Based on the current capitalization of the Company, it is expected future
cash flow from operations and availability of alternative sources of financing
should be sufficient to provide adequate liquidity for the foreseeable future.
Liquidity in future periods will be dependent on internally generated cash
flows, the ability to obtain adequate financing for capital expenditures and the
amount of increased working capital necessary to support expected growth. There
can be no assurance that liquidity would not be impacted by a
    
 
                                       30
<PAGE>
severe decline in general economic conditions and higher interest rates which
would affect the Company's ability to obtain external financing.
 
LONG-TERM DEBT
 
   
    On May 4, 1998, the Company acquired all of the outstanding capital stock of
Amatek from BTR Australia Limited, a wholly owned subsidiary of BTR plc, for a
purchase price of $600 million, including cash of $550 million and 1.4 million
shares of Common Stock valued at $32.2 million. The Company financed the MBCI
Acquisition by obtaining a new $600 million Senior Credit Facility from a
syndicate of lenders. See "The MBCI Acquisition."
    
 
   
    In March 1998, the Company entered into the Senior Credit Facility with the
lenders for the establishment of a $600 million credit facility. The Senior
Credit Facility consists of (i) the Five-Year Revolver, a five-year revolving
credit facility of up to $200 million, of which up to $20.0 million may be
utilized in the form of commercial and standby letters of credit, (ii) the Term
Loan, a five-year term loan facility in the principal amount of up to $200
million, and (iii) the 364-Day Revolver, a 364-day revolving credit facility of
up to $200 million. In addition to funding the MBCI Acquisition, borrowings
under the Senior Credit Facility may be used for working capital and other
general corporate purposes. The initial funding of $140.0 million under the
Five-Year Revolver, $200.0 million under the Term Loan and $200.0 million under
the 364-Day Revolver occurred on May 4, 1998, the date on which the MBCI
Acquisition was consummated (the "Acquisition Date"). Loans and letters of
credit under the Five-Year Revolver will be available, and amounts repaid under
the Five-Year Revolver may be reborrowed, at any time until July 1, 2003,
subject to the fulfillment of certain conditions precedent, including the
absence of default under the Senior Credit Facility. The Term Loan was fully
drawn down as of the Acquisition Date, and amounts repaid under the Term Loan
may not be reborrowed. The Company's obligations under the Senior Credit
Facility are secured by the pledge of all capital stock, partnership interests
and other equity interests of the Company's subsidiaries. All obligations under
the Senior Credit Facility are also guaranteed by each of the Company's
corporate subsidiaries and operating limited partnerships. The Senior Credit
Facility contains customary financial and restrictive covenants with amounts and
ratios negotiated between the Company and the lenders.
    
 
   
    The Senior Credit Facility provides for loans bearing interest, at the
Company's option, as follows: (i) Base Rate loans, Base Rate plus a margin that
ranges from 0% to 0.50%; and (ii) LIBOR loans, Adjusted LIBOR plus a margin that
ranges from 0.75% to 2.00%. "Base Rate" is the higher of NationsBank, N.A.'s
prime rate or the overnight Federal funds rate plus 0.5%, and "Adjusted LIBOR"
is the applicable London interbank offered rate adjusted for reserves, if any.
In each case, the margin is adjusted based on the Company's most recently
determined ratio of funded debt to EBITDA (as defined in the Senior Credit
Facility). The Senior Credit Facility currently bears interest at LIBOR plus
2.00%. The Company currently has an interest rate swap agreement in place, which
limits the Company's variable interest rate exposure on the Term Loan. The
agreement applies to the full principal amount of the Term Loan and caps
interest on LIBOR loans at 5.89% plus the applicable LIBOR margin. In the third
quarter of fiscal 1998, the Company's effective interest rate on variable rate
loans was 7.7%. With the application of the net proceeds of the Offering to
repay a portion of the 364-Day Revolver, the Company anticipates the LIBOR
margin will decrease to 1.375% as a result of the matrix pricing.
    
 
   
    Loans under the Five-Year Revolver mature on July 1, 2003. Loans under the
Term Loan are payable in successive quarterly installments beginning on October
31, 1998, in quarterly payments beginning with $7.5 million and gradually
increasing to $12.5 million on the maturity date. The 364-Day Revolver is part
of the Senior Credit Facility and matures on May 3, 1999. If the 364-Day
Revolver is not repaid by the Company or extended by the lenders, the Company
has the option to convert it to a three-year term note. Borrowings under the
Senior Credit Facility may be prepaid and voluntary reductions of the unutilized
portion of the Five-Year Revolver may be made at any time, in certain agreed
upon minimum amounts, without premium or penalty but subject to LIBOR breakage
costs. The Company is required to make
    
 
                                       31
<PAGE>
mandatory prepayments on the Senior Credit Facility upon the occurrence of
certain events, including the sale of assets and the issuance and sale of equity
securities, in each case subject to certain exceptions.
 
   
    As of July 31, 1998, the Company had $498.4 million outstanding under the
Senior Credit Facility. Total debt at July 31, 1998 also included $1.7 million,
representing a convertible debenture issued in connection with the Mesco
acquisition and an industrial revenue bond. The Senior Credit Facility requires
the Company to use the estimated net proceeds of the offering to repay $76.2
million of the outstanding principal balance of the 364-Day Revolver. See "Use
of Proceeds."
    
 
CAPITAL EXPENDITURES
 
    During fiscal 1997, NCI invested $11.3 million in capital additions,
including a new plant built in Monterrey, Mexico at a cost of approximately $2.0
million and expansion of its plant in Ennis, Texas for approximately $1.0
million. The remainder was spent primarily at other plant locations to increase
production capacity. All of these expenditures were paid from internally
generated cash.
 
    During 1997, MBCI had capital expenditures of $27.2 million, including the
construction of new plants ($5.0 million), the purchase of real property in
Phoenix, Arizona ($5.3 million), the rebuilding of the Lubbock, Texas plant
destroyed by fire ($4.8 million) and the expansion of the Memphis, Tennessee
plant ($2.0 million).
 
   
    For the nine months ended July 31, 1998, the Company invested $7.4 million
in capital additions for plant expansion and the development of new management
information systems. In addition, on May 21, 1998, the Company purchased the
plant and equipment of California Finished Metals, Inc. for $15.5 million in
order to expand its metal coating and painting operations to the western U.S.
The Company anticipates that capital expenditures for the remainder of 1998 will
be $14.0 million, including expansion of several facilities and expenditures for
two new plant locations expected to open in fiscal 1999. These projects, if not
delayed or canceled, would require $15.0 million in capital spending above the
amounts anticipated at the current time.
    
 
   
    Acquisitions of additional assets and businesses are expected to continue to
be an important part of the Company's strategy for growth. The Company would,
under certain circumstances, need to obtain additional debt and/or equity
financing to fund such acquisitions.
    
 
INFLATION
 
   
    Inflation has not significantly affected the Company's financial position or
operations. Metal building systems sales are affected more by the availability
of funds for financing construction than interest rates. No assurance can be
given that inflation or interest rates will not fluctuate significantly, either
or both of which could have an adverse effect on the Company's operations.
    
 
ACCOUNTING STANDARDS
 
    During the first quarter of fiscal 1998, NCI adopted Financial Accounting
Standards Board ("FASB") Statement No. 128, Earnings Per Share, which is
effective for financial statements issued for periods ending after December 15,
1997. Prior period net income per share amounts have been restated to conform
with Statement No. 128.
 
   
    During the third quarter of fiscal 1998, the Company adopted FASB Statement
No. 130, Comprehensive Income, which is effective for financial statements for
fiscal years beginning after December 15, 1997. The adoption of Statement No.
130 had no impact on the Company's financial statements.
    
 
    In June 1997, the FASB issued Statement No. 131, Disclosure about Segments
of an Enterprise and Related Information, which is effective for the Company's
fiscal year ending October 31, 1999. The Company is evaluating the segments that
will be reported under Statement No. 131.
 
                                       32
<PAGE>
IMPACT OF THE YEAR 2000 ISSUE
 
    The year 2000 issue is the result of computer programs having been written
using two digits rather than four to define the applicable year. Any computer
programs that have date-sensitive software may recognize a date using "00" as
the year 1900 rather than the year 2000. This could result in a system failure
or miscalculations causing disruptions of operations, including, among other
things, a temporary inability to process transactions, send invoices, or engage
in similar normal business activities.
 
   
    The Company has conducted a review of its computer systems to identify the
systems that could be affected by the year 2000 issue and is attempting to
ensure that its management information systems and computer software are year
2000 compliant. This review is part of the Company's overall upgrade of its MIS,
which is currently in progress and includes the installation of new systems. As
a result, the Company has no separate budget for year 2000 compliance. Expenses
relating to reviewing and assessing systems are included in historical operating
expenses as part of management information expenses and have not been separately
identified. Management expects the upgrade to be completed with respect to a
substantial majority of the Company's operations by the end of 1998 and that the
upgrade for the remaining operating divisions will be completed in the first six
months of 1999. Management believes that with installation of the new systems,
conversion to new software and modifications to existing software, the year 2000
issue will pose no significant operational problems for the Company's MIS. The
Company expects to complete all new installations, conversions and necessary
systems modifications and conversions by mid-1999. There can be no assurance,
however, that the Company will be able to install and maintain year 2000
compliant MIS and software.
    
 
   
    The Company is currently discussing with its vendors and customers the
possibility of any year 2000 interface difficulties that may affect the Company.
The ability of third parties with whom the Company transacts business to address
adequately their year 2000 issue is, however, outside the Company's control.
    
 
   
    To date, the Company has not identified any information technology assets
under the control of the Company that present a material risk of not being year
2000 ready or for which a suitable alternative cannot be implemented or is not
being implemented. The Company does not have a contingency plan with respect to
the year 2000 issue if the MIS upgrade is not completed or is delayed beyond the
end of 1999. The failure of the Company to address adequately, and in a timely
manner, the year 2000 issue, including ensuring that the Company's MIS and
software are year 2000 compliant, could have a material adverse effect on the
Company's business, results of operations and financial condition. As the
Company's MIS upgrade is implemented, the Company may identify assets that
present a risk of a year 2000-related disruption. It is also possible that such
a disruption could have a material adverse effect on the Company's business
financial condition and results of operations. In addition, if any third parties
who provide goods or services that are critical to the Company's business
activities fail to appropriately address their year 2000 issues, there could be
a material adverse effect on the Company's business, results of operations and
financial condition.
    
 
                                       33
<PAGE>
                               INDUSTRY OVERVIEW
 
    The building industry encompasses a broad range of metal products,
principally composed of steel, sold through a variety of distribution channels
for use in diverse applications. These metal products include metal components
and complete metal building systems.
 
METAL COMPONENTS
 
    Manufacturers of metal components for the building industry supply
pre-formed components, including roof and wall panels, doors, partitions,
related trim, accessories and other metal components used in metal building
systems and other repair, retrofit and new construction applications for
commercial, industrial, agricultural and residential uses. Metal components are
used in a wide variety of construction applications, including purlins and
girts, roofing, walls, doors, trim and other parts of traditional commercial,
industrial, agricultural and residential buildings as well as in architectural
applications and complete metal building systems. Management estimates the metal
components market (including roofing applications) to be a multi-billion dollar
market, although market data is limited. Metal components are used to a greater
extent in repair and retrofit applications than in new construction of metal
building systems and, therefore, management believes that the metal components
business exhibits less cyclicality than the metal building systems business.
Management believes that metal products have gained and continue to gain a
greater share of new construction and repair and retrofit markets due to
increasing acceptance and recognition of the benefits of metal products in
building applications.
 
    Metal roofing accounts for a significant portion of the overall metal
components market, but a relatively small percentage (approximately 5%) of the
large commercial roofing market estimated at over $20 billion annually. As a
result, management believes that significant opportunities exist for metal
roofing, with its advantages over conventional roofing materials, to increase
its overall share of this market. Metal roofing systems have several advantages
over conventional roofing systems, including the following:
 
    - LOWER LIFECYCLE COST.  The total cost over the life of metal roofing
      systems is lower than that of conventional roofing systems for both new
      construction and retrofit roofing. For new construction, the cost of
      installing metal roofing is greater than the cost of conventional roofing.
      Yet, the longer life and lower maintenance costs of metal roofing make the
      cost more attractive. For retrofit roofing, although installation costs
      are 60-70% higher for metal roofing due to the need for a sloping support
      system, the lower ongoing costs more than offset the initial expenditure.
 
    - INCREASED LONGEVITY.  Metal roofing systems generally last for 20 years
      without requiring major maintenance or replacement, compared to five to
      ten years for conventional roofs. The cost of leaks and roof failures
      associated with conventional roofing can be very high, including damage to
      building interiors and disruption of the functional usefulness of the
      building. Metal roofing prolongs the intervals between costly and
      time-consuming repair work.
 
    - ATTRACTIVE AESTHETICS AND DESIGN FLEXIBILITY.  Metal roofing systems allow
      architects and builders to integrate colors and geometric design into the
      roofing of new and existing buildings, providing an increasingly
      fashionable means of enhancing a building's aesthetics. Conventional
      roofing material is generally tar paper or a gravel surface, and building
      designers tend to conceal roofs made with such materials.
 
METAL BUILDING SYSTEMS
 
    Metal building systems consist of pre-engineered structural beams and panels
that are welded and roll formed in a factory and shipped to a construction site
complete and ready for assembly. Metal building systems manufacturers design an
integrated system that meets applicable building code requirements. These
systems consist of primary structural framing, secondary structural members
(i.e., purlins and girts) and covering for roofs and walls. Over the last
fifteen years, metal building systems have significantly
 
                                       34
<PAGE>
increased penetration of the market for non-residential low rise structures and
are being used in a broad variety of other applications. According to the Metal
Building Manufacturers Association ("MBMA"), reported sales of metal building
systems have increased from approximately $1.5 billion in 1993 to $2.5 billion
in 1997. The Company believes this increase has resulted primarily from (i) the
significant cost advantages offered by these systems, (ii) increased
architectural acceptance of metal building systems for construction of
commercial and industrial building projects, (iii) advances in design
versatility and production processes and (iv) a strong general economic
environment. The Company believes the cost of a metal building system generally
represents approximately 15-20% of the total cost of constructing a building,
which includes land cost, labor, plumbing, electrical, heating and air
conditioning systems installation and interior finish. Technological advances in
products and materials, as well as significant improvements in engineering and
design techniques, have led to the development of structural systems that are
compatible with more traditional construction materials. Architects and
designers now often combine a metal building system with masonry, glass and wood
exterior facades in order to meet the aesthetic requirements of customers while
preserving the inherent characteristics of metal building systems. As a result,
the uses for metal building systems now include office buildings, showrooms,
retail stores, banks, schools, warehouses, factories and distribution centers,
government and community centers for which aesthetics and architectural features
are important considerations of the end users.
 
    In its marketing efforts, the Company and other major manufacturers
generally emphasize the following characteristics of metal building systems to
distinguish them from other methods of construction:
 
    - SHORTER CONSTRUCTION TIME.  In many instances, it takes less time to
      construct a metal building than other building types. In addition, since
      most of the work is done in the factory, the likelihood of weather
      interruptions is reduced.
 
    - MORE EFFICIENT MATERIAL UTILIZATION.  The larger metal building systems
      manufacturers use computer-aided analysis and design to fabricate
      structural members with high strength-to-weight ratios, minimizing raw
      materials costs.
 
    - LOWER CONSTRUCTION COSTS.  The in-plant manufacture of metal building
      systems, coupled with automation, allows the substitution of less
      expensive factory labor for much of the skilled on-site construction labor
      otherwise required for traditional building methods.
 
    - GREATER EASE OF EXPANSION.  Metal building systems can be modified quickly
      and economically before, during or after the building is completed to
      accommodate all types of expansion. Typically, a building system can be
      expanded by removing the end or side walls, erecting new framework and
      adding matching wall and roof panels.
 
    - LOWER MAINTENANCE COSTS.  Unlike wood, metal will not deteriorate because
      of cracking, rot or insect damage. Furthermore, factory-applied roof and
      siding panel coatings resist cracking, peeling, chipping, chalking and
      fading.
 
CONSOLIDATION
 
    Over the last several years, there has been consolidation in the metal
components and metal building systems industry, which includes a large number of
small local and regional firms. Management believes that this industry will
continue to consolidate, driven by the needs of manufacturers to increase
manufacturing capacity, achieve greater process integration and add geographic
diversity in order to meet customers' product and delivery needs, improve
production efficiency and manage costs.
 
                                       35
<PAGE>
                                    BUSINESS
 
GENERAL
 
   
    The Company is one of North America's largest integrated manufacturers of
metal products for the building industry, with 38 manufacturing and distribution
facilities located in 18 states and Mexico. The Company sells metal components
as well as complete, pre-engineered metal building systems, offering one of the
most extensive metal product lines in the building industry with well-recognized
brand names. Management believes that the Company's leading market positions and
strong track record of growth and profitability have resulted from its focus on
improving manufacturing efficiency, controlling overhead costs, developing new
markets and successfully identifying and integrating strategic acquisitions. In
May 1998, NCI acquired MBCI, thereby doubling its sales, becoming the largest
domestic manufacturer of nonresidential metal components and significantly
improving its product mix. On a pro forma basis giving effect to the MBCI
Acquisition, the Company's sales and income from operations were $849.0 million
and $95.0 million, respectively, for the 12-month period ended July 31, 1998.
    
 
   
    METAL COMPONENTS.  With a market share at least twice that of its largest
competitor, the Company is the largest domestic supplier of metal components to
the nonresidential building industry. The Company designs, manufactures, sells
and distributes one of the widest selections of metal roof and wall systems,
overhead doors, fascia, mansard and various trim accessories for commercial,
industrial, architectural, agricultural and residential construction and repair
and retrofit uses. The Company is also one of the largest independent providers
of hot roll and light gauge metal coil coating and painting services and
products. The Company coats and paints hot roll coil metal for use in its own
metal components manufacturing, as well as processing hot roll coil metal and
toll coating light gauge metal for use by third parties. The Company markets its
metal components products and coating and painting services nationwide primarily
through a direct sales force under several brand names, including "Metal
Building Components," "American Building Components," "DBCI," "MBCI," "Metal
Coaters of Georgia," "Metal-Prep," "DOUBLECOTE" and "Metal Coaters of
California." On a pro forma basis giving effect to the MBCI Acquisition, the
Company's sales of metal components and coating and painting services were
$584.9 million, or 68.9% of total sales, for the 12-month period ended July 31,
1998.
    
 
   
    PRE-ENGINEERED METAL BUILDING SYSTEMS.  NCI is one of the largest domestic
suppliers of pre-engineered metal building systems. The Company designs,
manufactures and markets pre-engineered metal building systems, self-storage
building systems and metal home framing systems for commercial, industrial,
agricultural, governmental, community service and residential uses. The Company
markets these systems nationwide through authorized builder networks totaling
over 1,200 builders and a direct sales force under several brand names,
including "Metallic Buildings," "Mid-West Steel Buildings," "A & S Buildings,"
"All American Systems," "Steel Systems" and "Mesco." On a pro forma basis giving
effect to the MBCI Acquisition, the Company's sales of pre-engineered metal
building systems were $264.1 million, or 31.1% of total sales, for the 12-month
period ended July 31, 1998.
    
 
    Prior to their combination, NCI and MBCI both demonstrated strong growth in
sales and income from operations. NCI has achieved five-year compound annual
growth rates of 38.9% and 49.6%, respectively, in sales and income from
operations. MBCI has achieved five-year compound annual growth rates of 15.3%
and 16.2%, respectively, in sales and income from operations.
 
COMPANY STRENGTHS
 
    The Company believes that the combined NCI and MBCI operations will be able
to continue to grow sales income from operations, net income and net income per
share by capitalizing on the following strengths:
 
        LEADING MARKET POSITIONS AND SCALE OF OPERATIONS.  The Company is the
    largest manufacturer of metal components for the nonresidential building
    industry and one of the largest suppliers of pre-
 
                                       36
<PAGE>
    engineered metal building systems in the United States. In addition, the
    Company is one of the largest independent providers of coated steel. As a
    result of its leading market positions and scale of operations, the Company
    has expanded its geographic scope to meet customer product and delivery
    needs, realized production efficiencies and improved its ability to attract
    builders and other customers.
 
        BALANCE BETWEEN NEW CONSTRUCTION AND REPAIR AND RETROFIT
    END-MARKETS.  Prior to the MBCI Acquisition, NCI's business was focused
    primarily on pre-engineered metal building systems, demand for which is
    driven primarily by new building construction. The Company currently derives
    a majority of its sales and net income from metal components sales, which
    are used in a number of repair and retrofit applications as well as new
    construction. Management believes that the balance between these end markets
    reduces the impact on the Company of slowdowns in new construction activity
    and provides enhanced growth opportunities.
 
   
        LOW-COST SUPPLIER.  The Company strives to be the low-cost supplier to
    its customers by maintaining low production and distribution costs. The
    Company's large scale manufacturing capabilities provide purchasing
    efficiencies and enhance productivity through the sharing of best practices
    between metal components and pre-engineered metal building systems
    operations. In addition, the Company's "hub and spoke" system of satellite
    manufacturing facilities places the locations for the manufacture of
    secondary structural framing and covering systems and final distribution
    closer to the customer, thereby reducing transportation costs and delivery
    times. The MBCI Acquisition also provided the Company with in-house coil
    painting and coating operations, a significant cost element in metal
    components manufacturing. The Company is shifting its coating needs from
    third-party providers to its own production, thereby increasing coating
    utilization and recapturing margin paid to third parties.
    
 
        BROAD PRODUCT LINES AND DIVERSE CUSTOMER BASE.  The addition of MBCI's
    metal components operations, including metal coating and painting, to NCI's
    pre-engineered metal building systems has enabled the Company to become one
    of the largest integrated suppliers in the industry, offering a wider
    variety of products and services. In addition, the Company has a broad and
    diversified customer base with significant cross-selling opportunities. The
    Company's integrated and expanded product lines provide the Company with
    significant new marketing opportunities to increase sales to existing
    customers and obtain new customers by offering single-source metal building
    solutions to all of its customer base.
 
        NATIONWIDE COVERAGE.  The MBCI Acquisition provides the Company with the
    opportunity to expand substantially its manufacturing, selling and
    distribution presence into new geographic markets. The Company's
    pre-engineered metal building systems facilities in the South, Southwest and
    West complement its metal components facilities nationwide. The addition of
    MBCI's metal components locations in the Northeast and Northwest provide the
    Company with access to new regional markets for the Company's pre-engineered
    metal building systems. Management believes that the Company's geographic
    diversity will limit the impact from an economic downturn in any particular
    region.
 
   
        EXPERIENCED MANAGEMENT TEAM.  The Company's senior management team has
    an average of over 20 years of industry experience and has significantly
    increased its depth as a result of the MBCI Acquisition. The management
    teams of NCI and MBCI share similar business philosophies and historically
    have demonstrated an ability to grow sales and net income in times of
    strong, as well as adverse, economic conditions. Management attributes this
    ability to effectively marketing its products, strategically locating new
    manufacturing facilities, controlling expenses, maintaining flexibility in
    capital budgeting, reducing production and distribution costs and
    successfully completing and integrating acquisitions. In addition, the two
    management teams have successfully identified and completed nine
    acquisitions in the last five years. The Company's senior management team
    will own approximately 12.3% of the Common Stock after giving effect to the
    Offering.
    
 
                                       37
<PAGE>
BUSINESS STRATEGY
 
    The Company's management has developed business strategies to capitalize on
the Company's strengths. The Company's primary business strategies include the
following:
 
        PURSUE STRATEGIC GROWTH OPPORTUNITIES.  Throughout its history, the
    Company has increased its sales and net income through a combination of
    selective acquisitions and internal growth. Since 1993, the Company has
    successfully acquired and integrated seven companies and is in the process
    of integrating MBCI and a subsequently acquired metal coating and painting
    operation. Management's disciplined acquisition strategy is focused on the
    identification of suppliers of metal products and services that can be
    relatively quickly assimilated into the Company's operations and that offer
    opportunities to expand the Company's product line, further vertically
    integrate its operations or broaden its geographic reach. In order to expand
    its geographic coverage and increase manufacturing capacity, the Company has
    also constructed nine new manufacturing facilities in the last five years
    and has formed four joint ventures to expand into new markets and to
    increase market penetration of existing markets.
 
        LEVERAGE EXISTING DISTRIBUTION CHANNELS TO INCREASE SALES OF METAL
    COMPONENTS.  The Company seeks to penetrate further the metal components
    market, primarily for metal roofing and wall systems. Currently, the Company
    sells its products under well-recognized brand names through various
    distribution channels to a broad range of end users. These channels include,
    among others, (i) authorized builders, (ii) building materials
    manufacturers, distributors and retailers, (iii) roofing systems installers,
    (iv) contractors and end users and (v) builders of self-storage facilities.
    The Company plans to increase sales and net income by utilizing its multiple
    distribution channels to market its expanded range of metal components
    products to existing and new customers.
 
        CONTINUE TO ENHANCE FLEXIBLE, COST-EFFECTIVE PRODUCTION FACILITIES AND
    PROCESSES.  The Company's commitment to providing its customers with quality
    products on a timely basis at competitive prices remains a key element of
    its business strategy. As a result, management is focused on continuous cost
    reduction including realization of opportunities to (i) aggressively manage
    the purchase of raw materials, (ii) further automate its manufacturing
    operations to reduce process costs and improve product quality and (iii)
    capitalize on the breadth of the Company's geographic coverage to provide
    customers with rapid delivery.
 
        INCREASE SALES OF PRE-ENGINEERED METAL BUILDING SYSTEMS IN NEW AND
    EXISTING GEOGRAPHIC MARKETS. The addition of MBCI's metal components
    locations nationwide provides the Company with an opportunity to expand
    sales of the Company's pre-engineered metal building systems in existing
    markets and provides access to new regional markets in the Northeast and
    Northwest. By utilizing MBCI's nationwide metal components manufacturing
    facilities as platforms for expansion, the Company is well positioned to
    increase sales of pre-engineered metal building systems in markets that
    previously had been difficult for NCI to serve on a cost-effective basis.
 
                                       38
<PAGE>
ACQUISITIONS AND JOINT VENTURES
 
    ACQUISITIONS.  The following table describes NCI's and MBCI's combined
acquisition activity since 1993:
 
<TABLE>
<CAPTION>
                                                         PURCHASE
                                                           PRICE
SELLER                                 DATE ACQUIRED   (IN MILLIONS)      BUSINESS ACQUIRED            LOCATIONS
- -------------------------------------  -------------  ---------------  ------------------------  ----------------------
<S>                                    <C>            <C>              <C>                       <C>
Ellis Building Components, Inc.          Oct. 1994       $     4.9     Metal building systems    Tallapoosa, GA
                                                                       and metal components
 
Royal Metal Buildings, Inc.              Mar. 1995             0.9     Metal building systems    Hobbs, NM
                                                                       and metal components
 
Doors & Building Components, Inc.        Nov. 1995            14.7     Doors and interior metal  Douglasville, GA;
                                                                       components                Chandler, AZ
 
Carlisle Engineered Metals, Inc.         Mar. 1996             2.8     Metal components (West    Lodi, CA
                                                                       coast division)
 
Anderson Industries, Inc.                Apr. 1996            22.3     Metal building systems,   Southlake, TX;
                                                                       metal components, metal   Chester, SC
                                                                       roofs and components
                                                                       (Mesco division)
 
Alta Industries                          Apr. 1996            19.0     Metal components          Salt Lake City, UT;
                                                                       (Steelco division)        Boise, ID
 
Carlisle Engineered Metals, Inc.         Feb. 1997             6.2     Insulated panels and      Stratford, TX;
                                                                       metal components          Jemison, AL
                                                                       (division)
 
BTR plc                                  May 1998            600.0     Metal components and      Houston, TX
                                                                       metal coating and         headquarters and 21
                                                                       painting (MBCI)           other facilities in
                                                                                                 U.S.
 
Chicago Metallic Corporation             May 1998             15.0     Metal coating and         Rancho Cucamonga, CA
                                                                       painting (California
                                                                       Finished Metals)
</TABLE>
 
    JOINT VENTURES.  The Company has also formed the following joint ventures:
 
<TABLE>
<CAPTION>
                                        OPERATIONS      PERCENTAGE
JOINT VENTURE                              BEGUN         OWNERSHIP             BUSINESS                 LOCATION
- -------------------------------------  -------------  ---------------  ------------------------  ----------------------
<S>                                    <C>            <C>              <C>                       <C>
DOUBLECOTE, L.L.C.                       Apr. 1995             50%     Metal coating and         Jackson, MS
                                                                       painting
 
Metallic de Mexico, S.A. de C.V.         Nov. 1995             50%     Drafting and marketing    Monterrey, Mexico
 
Building Systems de Mexico, S.A. de      July 1997             51%     Primary structures for    Monterrey, Mexico
  C.V.                                                                 metal building systems
 
Midwest Metal Coating, L.L.C.               (1)                50%     Metal coating and         Granite City, IL
                                                                       painting
</TABLE>
 
- ------------------------------
 
(1) Expected to commence operations in the first quarter of 1999.
 
                                       39
<PAGE>
PRODUCTS AND MARKETS
 
    The Company's product lines consist of metal components for the building
industry and pre-engineered metal building systems. On an actual and pro forma
basis, giving effect to the MBCI Acquisition, NCI's and the Company's sales,
respectively, for the periods indicated attributable to these product lines were
approximately as follows:
 
<TABLE>
<S>                              <C>        <C>          <C>        <C>          <C>        <C>          <C>        <C>
                                                                     YEAR ENDED OCTOBER 31,
                                 ----------------------------------------------------------------------------------------------
                                                                                                               PRO FORMA
                                          1995                    1996                    1997                    1997
                                 ----------------------  ----------------------  ----------------------  ----------------------
                                                                         (IN MILLIONS)
Metal components...............  $    60.3       25.8%   $   119.9       36.0%   $   161.2       39.5%   $   569.1       69.8%
 
Metal building systems.........      173.9       74.2        213.0       64.0        246.6       60.5        246.6       30.2
                                 ---------      -----    ---------      -----    ---------      -----    ---------      -----
 
    Total sales................  $   234.2      100.0%   $   332.9      100.0%   $   407.8      100.0%   $   815.7      100.0%
                                 ---------      -----    ---------      -----    ---------      -----    ---------      -----
                                 ---------      -----    ---------      -----    ---------      -----    ---------      -----
</TABLE>
 
    METAL COMPONENTS.  The Company's metal components consist of individual
components, including secondary structural framing, covering systems and
associated metal trims, that are sold directly to contractors or end users for
use in the building industry, including the construction of metal buildings. The
Company also stocks and markets metal component parts for use in the maintenance
and repair of existing buildings. Specific component products consist of end and
side wall panels, roof panels, purlins, girts, partitions, header panels and
related trim and screws. The Company believes it offers the widest selection of
metal components in the building industry.
 
    Purlins and girts, which are medium gauge, roll formed steel components, are
supplied to builders for secondary structural framing. The Company custom
produces purlins and girts for its customers and offers the widest selection of
sizes and profiles of purlins and girts in the United States. Covering systems,
consisting of wall and roof panels, protect the rest of the structure and the
contents of the building from the weather, while also contributing to the
structural integrity of the building.
 
    The Company's metal roofing products are attractive and durable. The Company
uses standing seam roof technology to replace traditional built-up and
single-ply roofs as well as to provide a distinctive look to new construction.
The Company manufactures and designs metal roofing systems for sales to regional
metal building manufacturers, general contractors and subcontractors. The
Company believes it has the broadest line of standing seam roofing products in
the building industry. The Company has also developed and patented a retrofit
metal panel, Retro-R-Registered Trademark-, that is used to replace wall and
roof panels of metal buildings. Retro-R-Registered Trademark- can be installed
over the top of existing metal panels to remodel or preserve a standing
structure. Although metal roofing is somewhat more expensive than traditional
roofing in upfront costs, its durability and low maintenance costs make metal
roofing a lower cost roofing product after the first 10 years.
 
    The Company manufactures overhead doors and interior and exterior doors for
use in metal and other buildings. The Company is one of the largest suppliers in
the U.S. of roll-up doors to builders of self-storage facilities.
 
    The Company provides its own metal coating and painting products and
services for use in component manufacturing. As a toll coater of hot roll steel
coils, the Company also provides pre-painted hot roll coils to manufacturers of
metal building systems and metal components. Either a customer provides coils
through its own supply channels, which are processed by the Company, or the
Company purchases hot roll coils and processes them for sale as a packaged
product. The Company also pre-paints light gauge steel coils for steel mills,
which supply the painted coils to various industrial users, including metal
building systems and metal components manufacturers and manufacturers of
lighting fixtures.
 
    The Company's metal coating and painting operations apply a variety of paint
systems to metal coils. The process generally includes cleaning and painting the
coil and slitting it to customer specifications. The
 
                                       40
<PAGE>
Company believes that pre-painted metal coils are a better quality product,
environmentally cleaner and more cost-effective than painted metal products
prepared in other manufacturers' in-house painting operations. Painted metal
coils also offer manufacturers the opportunity to produce a broader and more
aesthetically pleasing range of products.
 
    PRE-ENGINEERED METAL BUILDING SYSTEMS.  Pre-engineered metal building
systems consist of pre-engineered structural beams and panels that are welded
and roll formed in a factory and shipped to a construction site complete and
ready for assembly. The Company designs an integrated metal building system that
meets customer specifications and allows easy on-site assembly by the builder or
independent contractor. Pre-engineered metal building systems typically consist
of three systems:
 
    - PRIMARY STRUCTURAL FRAMING.  Primary structural framing, fabricated from
      heavy-gauge steel, supports the secondary structural framing, roof, walls
      and all externally applied loads. Through the primary framing, the force
      of all applied loads is structurally transferred to the foundation.
 
    - SECONDARY STRUCTURAL FRAMING.  Secondary structural framing consists of
      medium-gauge, roll-formed steel components called purlins and girts.
      Purlins are attached to the primary frame to support the roof. Girts are
      attached to the primary frame to support the walls. The secondary
      structural framing is designed to strengthen the primary structural
      framing and efficiently transfer applied loads from the roof and walls to
      the primary structural framing.
 
    - COVERING SYSTEMS.  Covering systems consist of roof and wall panels. These
      panels not only lock out the weather but also contribute to the structural
      integrity of the overall building system. Roof and siding panels are
      fabricated from light-gauge, roll-formed steel. Accessory components
      complete the pre-engineered metal building system. These components
      include doors, windows, gutters and interior partitions.
 
            [ART--SIMPLIFIED STRUCTURE WITH BASIC SUBSYSTEMS SHOWN]
 
                                       41
<PAGE>
SALES, MARKETING AND CUSTOMERS
 
   
    METAL COMPONENTS.  The Company sells metal components directly to regional
manufacturers, contractors, subcontractors, distributors, lumberyards,
cooperative buying groups and other customers under the brand names "Metal
Building Components," "American Building Components" and "MBCI." Roll-up doors,
interior and exterior doors, interior partitions and walls, header panels and
trim are sold directly to contractors and other customers under the brand names
"Doors & Building Components" or "DBCI." These components also are produced for
integration into self storage and pre-engineered metal building systems sold by
of the Company.
    
 
    The Company markets its components products within four product lines: (i)
commercial/industrial; (ii) architectural; (iii) wood frame builders; and (iv)
residential. Customers include regional metal building systems manufacturers,
general contractors, subcontractors, roofing installers, architects and
end-users. Commercial and industrial businesses are heavy users of metal
components and metal buildings systems. Standing seam roof and architectural
customers are growing in importance. As metal buildings become a more acceptable
building alternative and aesthetics become an increasingly important
consideration for end users of metal buildings, the Company believes that
architects are participating in metal building design and purchase decisions to
a greater extent. Wood frame builders also purchase the Company's metal
components through distributors, lumberyards, cooperative buying groups and
chain stores for various uses, including agricultural buildings. Residential
customers are generally contractors building upscale homes that require an
architect-specified product.
 
    The Company's metal components sales operations are organized into four
geographic regions. Each region is headed by a general sales manager supported
by individual plant sales managers. Each local sales office is located adjacent
to a manufacturing plant and is staffed by a direct sales force responsible for
contacting customers and architects and a sales coordinator who supervises the
sales process from the time the order is received until it is shipped and
invoiced. The regional and local focus of the Company's customers requires
extensive knowledge of local business conditions.
 
    The Company provides its customers with product catalogs tailored to its
product lines, which include product specifications and suggested list prices.
Certain of the Company's catalogs are available on-line through the Internet,
which enables architects and other customers to download drawings for use in
developing project specifications. Customers place orders via telephone or
facsimile to a sales coordinator at the regional office who enters it onto a
standard order form. The form is then sent via computer to the plant and
downloaded automatically to the production machines.
 
    The Company has a small number of national accounts for its coating and
painting products and services and relies on a single sales manager. The Company
also has a metal coating joint venture, which has an independent sales force.
 
    PRE-ENGINEERED METAL BUILDING SYSTEMS.  The Company sells pre-engineered
metal building systems to builders nationwide under the brand names "Metallic
Buildings," "A&S Buildings" and "Mesco," respectively. The Company markets
pre-engineered metal building systems through an in-house sales force to
authorized builder networks of over 1,200 builders. The Company markets
pre-engineered metal building systems under the brand name "Mid-West Steel
Buildings" directly to contractors in Texas and surrounding states using an
in-house sales force. The Company also sells pre-engineered metal building
systems under the name "All American Systems" and various private labels.
 
    The Company's authorized builder networks consist of independent general
contractors which market the Company's Metallic Buildings, A&S Buildings and
Mesco products to end users. Most of the Company's sales of pre-engineered metal
building systems outside of Texas and surrounding states are through its
authorized builder networks. The Company relies upon maintaining a satisfactory
business relationship for the continued receipt of job orders from its
authorized builders and does not consider the builder agreements to be material
to its business. During fiscal 1997, the Company's largest customer for
pre-engineered metal building systems accounted for less than 2% of the
Company's total sales.
 
                                       42
<PAGE>
    The Company enters into an agreement with an authorized builder, which
generally grants the builder the non-exclusive right to market the Company's
products in a specified territory and which is cancelable by either party on 60
days notice. The agreements do not prohibit the builder from marketing metal
building systems of other manufacturers. The Company establishes an annual sales
goal for each builder and provides to the builder sales and pricing information,
design and engineering manuals, drawings and assistance, application programs
for estimating and quoting jobs and advertising and promotional literature. The
Company also defrays a portion of the builder's advertising costs and provides
volume purchasing and other pricing incentives to encourage them to deal
exclusively or principally with the Company. The builder is required to maintain
a place of business in its designated territory, provide a sales organization,
conduct periodic advertising programs and perform construction, warranty and
other services for customers and potential customers. An authorized builder
usually is hired by an end user to erect a metal building system on the
customer's site and provide general contracting and other services ancillary to
the completion of the project. The Company sells its products to the builder,
which generally includes the price of the building as a part of its overall
construction contract with its customer.
 
MANUFACTURE AND DESIGN
 
    METAL COMPONENTS.  The Company operates 37 facilities used for manufacturing
of metal components for the building industry, including its metal coating and
painting operations. The Company believes this broad geographic penetration
gives it an advantage over its components competitors because major elements of
a customer's decision are the speed and cost of delivery from the manufacturing
facility to the product's ultimate destination. With the exception of the
Company's architectural and standing seam products, the Company is not involved
in the design process for the components it manufactures. The Company also owns
a fleet of trucks to deliver its products to its customers in a more timely
manner than most of its competitors.
 
    The Company's doors, interior partitions and other related panels and trim
products are manufactured at dedicated plants in Georgia, Texas and Arizona. The
products are roll-formed or fabricated at each plant using roll-formers and
other metal working equipment. Orders are processed at the Georgia plant and
sent to the appropriate plant, which is generally determined in a manner to
obtain the lowest shipping cost.
 
    METAL COATING AND PAINTING.  The Company operates two metal coating and
painting facilities from which it primarily services its own needs and the needs
of other metal components manufacturers through the processing of hot rolled
steel coils. Metal coating and painting processes involve applying various types
of chemical treatments and paint systems to flat rolled continuous coils of
metal, including steel and aluminum, giving the coils a baked-on finish that
both protects the metal and makes it more attractive. Initially, various metal
substrates in coil form are flattened, cleaned and pretreated. The metal is then
coated, oven cured, cooled, recoiled and packaged for shipment. Slitting and
embossing services can also be performed on the coated metal prior to shipping
pursuant to customer specifications. Hot roll steel coils typically are used in
the production of secondary structural framing of metal buildings and other
structure applications. Painted light gauge steel coils are used in the
manufacture of products for building exteriors, metal doors, lighting fixtures
and appliances. The Company's metal coating operation is one of only two metal
coaters in the United States to receive the Supplier Excellence Award from
Bethlehem Steel Corporation.
 
    The Company is a joint venture partner in two metal coating operations. The
Company owns 50% of an existing metal coating joint venture with a processing
plant in Jackson, Mississippi. The Company also owns 50% of a new joint venture,
which has acquired land in Granite City, Illinois and is building a hot rolled
coil coating facility that is expected to commence operations in the first
quarter of 1999. The new facility will be used to slit and coat hot rolled coils
of medium gauge steel for use in manufacturing purlins and girts. The Company
has agreed to purchase a substantial portion of its production requirements for
that product from the new joint venture.
 
                                       43
<PAGE>
    PRE-ENGINEERED METAL BUILDING SYSTEMS.  After the Company receives an order,
the Company's engineers design the metal building system to meet the customer's
requirements and to satisfy applicable building codes and zoning requirements.
In order to expedite this process, the Company uses computer-aided design and
engineering systems to generate engineering and erection drawings and a bill of
materials for the manufacture of the pre-engineered metal building system. The
Company employs approximately 185 engineers and draftsmen in this area.
 
    Once the specifications and designs of the customer's project have been
finalized, the manufacturing process of frames and other building systems begins
at one of the Company's six manufacturing facilities in Texas, Georgia, South
Carolina or Tennessee or its joint venture facility in Mexico. The fabrication
of the primary structural framing consists of a process in which pieces of rigid
steel plates are punched and sheared and then routed through an automatic
welding machine and sent through further fitting and welding processes. The
secondary structural framing and the covering subsystem are roll-formed steel
products that are manufactured at the Company's full manufacturing facilities as
well as its regional satellite plants. In roll forming, pre-finished coils of
steel are unwound and passed through a series of progressive forming rolls which
form the steel into various profiles of medium-gauge structural shapes and
light-gauge sheets and panels.
 
    Once manufactured, structural framing members and covering systems are
shipped to the job site for assembly. The Company generally is not responsible
for any on-site construction. The time elapsed between the Company's receipt of
an order and shipment of a completed building system has typically ranged from
four to eight weeks, although delivery can extend somewhat longer if engineering
and drafting requirements are extensive.
 
    The Company owns 51% of a joint venture, which began operation of a framing
facility in Monterrey, Mexico in July 1997. The Company purchases substantially
all of the framing systems produced by the Mexico joint venture.
 
RAW MATERIALS
 
    The principal raw material used in the manufacture of the Company's
pre-engineered metal building systems and component products is steel.
Components are fabricated from common steel products produced by mills including
bars, plates, sheets and galvanized sheets. On a combined basis for their
respective 1997 fiscal years, NCI and MBCI purchased an aggregate of
approximately 80% of their steel requirements from National Steel Corporation
and Bethlehem Steel Corporation. No other steel supplier accounted for more than
10% of the combined steel purchases for the same period. The Company believes
concentration of its steel purchases among a small group of suppliers that have
mills and warehouse facilities in close proximity to the Company's facilities
enables it, as a large customer of those suppliers, to obtain better service and
delivery. These suppliers generally maintain an inventory of the types of
materials required by the Company, enabling the Company to utilize a form of
"just-in-time" inventory management with regard to raw materials.
 
    The Company does not have any long-term contracts for the purchase of raw
materials. A prolonged labor strike against one of its principal domestic
suppliers could have a material adverse effect on the Company's operations.
Alternative sources, however, including foreign steel, are currently believed to
be sufficient to maintain required deliveries.
 
BACKLOG
 
   
    At July 31, 1998, the total backlog for orders for the Company's products
believed by the Company to be firm was $167.9 million. This compares with a
total backlog for NCI's products of $110.0 million at October 31, 1997, and
$85.6 million at October 31, 1996, and for MBCI's products of $16.1 million at
December 31, 1997, and $14.9 million at December 31, 1996. The increases in
backlog reflect the results of the marketing activities of the Company and
market demand. Backlog primarily consists of pre-engineered
    
 
                                       44
<PAGE>
   
metal building systems. Job orders generally are cancelable by customers at any
time for any reason and, occasionally, orders in the backlog are not completed
and shipped for reasons that include changes in the requirements of the
customers and the inability of customers to obtain necessary financing or zoning
variances. None of the backlog at July 31, 1998, currently is scheduled to
extend beyond July 31, 1999.
    
 
COMPETITION
 
    The Company competes with a number of other manufacturers of metal
components and metal building systems for the building industry, ranging from
small local firms to large national firms. Most of these competitors operate on
a regional basis, although the Company believes that at least four other
manufacturers of metal building systems and several manufacturers of metal
components have nationwide coverage. In addition, the Company and other
manufacturers of metal components and metal building systems compete with
alternative methods of building construction, which may be perceived as more
traditional, more aesthetically pleasing or having other advantages. Competition
is based primarily on price, speed of construction, quality of builder/dealer
networks, the ability to provide added value in the design and engineering of
buildings and, among manufacturers of metal components and metal building
systems, service, quality and delivery times.
 
REGULATORY MATTERS
 
    The Company's operations are subject to a wide variety of federal, state and
local laws and regulations governing, among other things, emissions to air,
discharges to waters, the generation, handling, storage, transportation,
treatment, and disposal of hazardous substances and other materials and health
and safety matters. Laws protecting the environment generally have become more
stringent than in the past and are expected to continue to do so. Environmental
laws and regulations generally impose "strict liability," which means that in
some situations the Company could be exposed to liability for cleanup costs, and
"toxic tort" or other damages as a result of conduct that was lawful at the time
it occurred or conduct of, or conditions caused by, prior operators or other
third parties, regardless of fault on the part of the Company. The Company
believes it is in substantial compliance with all environmental standards
applicable to its operations. However, there can be no assurance that cleanup
costs, natural resource damages, criminal sanctions, "toxic tort" or other
damages arising as a result of environmental laws and costs associated with
complying with changes in environmental laws and regulations will not be
substantial and will not have a material adverse effect on the Company's
financial condition. From time to time, claims have been made against the
Company under environmental laws. The Company has insurance coverage for certain
environmental claims and certain locations after payment of the applicable
deductible. The Company does not anticipate material capital expenditures to
meet current environmental quality control standards. There can be no assurance
that more stringent regulatory standards will not be established that might
require such expenditures.
 
    The Company is also subject to federal, state and local laws and regulations
governing occupational safety and health, including review by the federal
Occupational Health and Safety Administration and similar state agencies. The
Company believes it is in substantial compliance with applicable laws and
regulations, and compliance does not have a material adverse affect on the
Company's business.
 
    The pre-engineered metal building systems manufactured by the Company must
meet zoning and building code requirements promulgated by local governmental
agencies.
 
                                       45
<PAGE>
PATENTS, LICENSES AND PROPRIETARY RIGHTS
 
    The Company has a number of United States patents and pending patent
applications, including patents relating to metal roofing systems and metal
overhead doors. The Company does not, however, consider patent protection to be
a material competitive factor in its industry. The Company also has several
registered trademarks and pending registrations in the United States.
 
EMPLOYEES
 
   
    As of July 31, 1998, the Company had approximately 3,700 employees, of whom
over 2,700 were manufacturing and engineering personnel. The Company regards its
employee relations as satisfactory.
    
 
    The Company's employees are not represented by a labor union or collective
bargaining agreement, although the United Steel Workers of America petitioned
the National Labor Relations Board to be recognized as the collective bargaining
representative of the production and maintenance employees of the Company's
Tallapoosa, Georgia facility. An election for that purpose was held in January
1996 and the union lost the election to be recognized as the collective
bargaining representative of such employees. A similar election was held at the
Company's Mattoon, Illinois facility in November 1997 and the United Steel
Workers of America lost that election.
 
LEGAL PROCEEDINGS
 
    The Company is involved in various legal proceedings that the Company
considers to be in the normal course of business. Management believes that such
litigation will not have a material adverse effect on the Company's results of
operations or financial condition.
 
PROPERTIES
 
    The Company conducts manufacturing operations at the following facilities:
 
   
<TABLE>
<CAPTION>
                                                                  SQUARE      OWNED
FACILITY                      PRODUCTS                             FEET     OR LEASED
- ----------------------------  ---------------------------------  ---------  ---------
<S>                           <C>                                <C>        <C>
Chandler, Arizona             Doors and related metal               35,000   Leased
                                components
 
Tomlinson, Arizona            Metal components(1)                   65,980    Owned
 
Atwater, California           Metal components(2)                   85,700    Owned
 
Rancho Cucamonga, California  Metal coating and painting            98,000    Owned
 
Tampa, Florida                Metal components(3)                   28,775    Owned
 
Adel, Georgia                 Metal components(1)                   59,550    Owned
 
Douglasville, Georgia         Metal components(4)                  110,536    Owned
 
Douglasville, Georgia         Doors and related metal               60,000    Owned
                                components
 
Marietta, Georgia             Metal coating and painting           125,700    Owned
 
Tallapoosa, Georgia           Metal building systems(5)            246,000   Leased
                              Metal components
 
Napa, Idaho                   Metal components(6)                   42,900    Owned
 
Mattoon, Illinois             Metal components(2)                   90,600    Owned
 
Shelbyville, Indiana          Metal components(6)                   66,450    Owned
 
Nicholasville, Kentucky       Metal components(7)                   41,280    Owned
 
Monterrey, Mexico(8)          Metal building systems(9)             64,125    Owned
 
Jackson, Mississippi          Metal components(2)                   96,000    Owned
 
Jackson, Mississippi(10)      Metal coating and painting           363,200    Owned
 
Omaha, Nebraska               Metal components(7)                   51,750    Owned
 
Hobbs, New Mexico(11)         Metal components(2)                   60,800   Leased
 
Rome, New York                Metal components(6)                   57,700    Owned
 
Oklahoma City, Oklahoma       Metal components(1)                   59,695    Owned
</TABLE>
    
 
                                       46
<PAGE>
   
<TABLE>
<CAPTION>
                                                                  SQUARE      OWNED
FACILITY                      PRODUCTS                             FEET     OR LEASED
- ----------------------------  ---------------------------------  ---------  ---------
<S>                           <C>                                <C>        <C>
Chester, South Carolina       Metal building systems(5)            124,000    Owned
                              Metal components
 
Caryville, Tennessee          Metal building systems(5)            193,800    Owned
                              Metal components
 
Memphis, Tennessee            Metal coating and painting            61,500    Owned
 
Nesbitt, Tennessee            Metal components(1)                   71,720    Owned
 
Ennis, Texas                  Metal components and studs            33,000    Owned
 
Grand Prairie, Texas          Metal components(1)                   48,027    Owned
 
Houston, Texas                Metal components                      97,000    Owned
 
Houston, Texas                Metal components(4)                  209,355    Owned
 
Houston, Texas                Metal coating and painting            39,550    Owned
 
Houston, Texas(12)            Metal building systems(5)            382,000    Owned
                              Metal components
                              Doors
 
Lubbock, Texas                Metal components(1)(7)                64,320    Owned
 
San Antonio, Texas            Metal components(6)                   52,360    Owned
 
Southlake, Texas              Metal building systems(5)            123,000    Owned
                              Metal components
 
Stafford, Texas               Metal components                     105,000   Leased
 
Stafford, Texas(11)           Metal components                      56,840   Leased
 
Salt Lake City, Utah          Metal components(1)                   93,150    Owned
 
Colonial Heights, Virginia    Metal components(1)                   37,000    Owned
</TABLE>
    
 
- ------------------------------
 
(1) Secondary structures and covering systems.
 
(2) Includes secondary structures and covering systems.
 
(3) Covering products.
 
(4) Full product range.
 
(5) Primary structures, secondary structures and covering systems.
 
(6) Covering systems.
 
(7) Specialized products.
 
(8) The Company owns a 51% interest in a joint venture.
 
(9) Primary structures.
 
(10) The Company owns a 50% interest in a joint venture.
 
   
(11) Currently targeted for closure by the end of 1999.
    
 
   
(12) Includes 33,600 square feet used for the Company's principal executive
    offices.
    
 
    The Company also maintains several drafting office facilities and retail
locations in various states. These additional facilities are subject to
short-term leases.
 
    The Company believes that its present facilities are adequate for its
current and projected operations. As part of the integration plan implemented in
connection with the MBCI Acquisition, the Company is reviewing its manufacturing
facilities and considering the consolidation or closure of certain facilities as
part of its efforts to maximize production efficiencies.
 
                                       47
<PAGE>
                                   MANAGEMENT
 
DIRECTORS, EXECUTIVE OFFICERS AND OTHER KEY MANAGERS
 
   
    The directors, executive officers and other key managers of the Company, and
their ages as of August 31, 1998, are as follows:
    
 
   
<TABLE>
<CAPTION>
NAME                                         AGE                                   POSITION
- ---------------------------------------      ---      -------------------------------------------------------------------
<S>                                      <C>          <C>
DIRECTORS AND EXECUTIVE OFFICERS:
 
C. A. Rundell, Jr......................          66   Chairman of the Board and Class II Director
 
Johnie Schulte, Jr.....................          63   President, Chief Executive Officer, President and Chief Executive
                                                        Officer of Metal Buildings Division and Class III Director
 
A. R. Ginn.............................          59   Executive Vice President and Chief Operating Officer, President and
                                                        Chief Executive Officer of Metal Components Division, Chief
                                                        Executive Officer of Metal Coaters Division and Class I Director
 
Leonard F. George......................          46   Executive Vice President of Metal Buildings Division and Class III
                                                        Director
 
Robert J. Medlock......................          58   Vice President, Treasurer and Chief Financial Officer and Vice
                                                        President, Chief Financial Officer and Treasurer of Metal
                                                        Buildings Division
 
Kenneth W. Maddox......................          51   Vice President, Vice President and Chief Financial Officer of Metal
                                                        Components Division and Metal Coaters Division and Class I
                                                        Director
 
Donnie R. Humphries....................          48   Secretary and Vice President, Human Relations of Metal Buildings
                                                        Division
 
Thomas C. Arnett.......................          65   Class I Director
 
William D. Breedlove...................          58   Class III Director
 
Gary L. Forbes.........................          54   Class II Director
 
Robert N. McDonald.....................          70   Class II Director
 
Daniel D. Zabcik.......................          69   Class I Director
 
OTHER KEY MANAGERS:
 
Jerry D. Boen..........................          51   Vice President, Marketing of Metal Components Division
 
David B. Curtis........................          38   President of Doors & Building Components Division
 
Charles W. Dickinson...................          47   Vice President, Sales of Metal Components Division
 
John T. Eubanks........................          58   President of Mesco Metal Buildings Division
 
Kelly R. Ginn..........................          37   Vice President, Manufacturing of Metal Components Division
 
John W. Holmes.........................          48   President of Metal Prep Division
 
Richard F. Klein.......................          59   President and Chief Operating Officer of Metal Coaters Division
 
Fredrick D. Koetting...................          39   Vice President, Operations of Metal Buildings Division
 
Alvan E. Richey, Jr....................          62   Vice President, Sales and Marketing of Metal Buildings Division
</TABLE>
    
 
                                       48
<PAGE>
    DIRECTORS AND EXECUTIVE OFFICERS:
 
    C.A. Rundell, Jr. has served as a director and Chairman of the Board of the
Company since April 1989. Since October 1997, Mr. Rundell has been President,
Chief Executive Officer and a director of Tyler Corporation, a provider of
information management systems and services for county governments and other
enterprises and a distributor of automotive aftermarket parts. Mr. Rundell
served as Chairman of the Board of Tyler Corporation from October 1996 until
October 1997, and as its temporary Chief Executive Officer from October 1996 to
March 1997. Since May 1988, Mr. Rundell has owned and operated Rundell
Enterprises, a sole proprietorship engaged in providing acquisition and
financial consulting services to various business enterprises. From 1977 to
1988, Mr. Rundell was the President, Chief Executive Officer and a director of
Cronus Industries, Inc. (now Business Records Corporation) ("Cronus"). Mr.
Rundell is also a director of Dain Rauscher Corporation, a holding company for a
full-service regional brokerage and investment banking company, and Tandy Brands
Accessories, Inc., a manufacturer of accessories for men, women and boys.
 
    Johnie Schulte, Jr. a founder of the Company, has been a director, President
and Chief Executive Officer of the Company since 1984 and as the President and
Chief Executive Officer of the Metal Buildings Division since May 1998. Mr.
Schulte founded and was President of Mid-West Steel Buildings Co., Inc. from
1970 until its sale to American Buildings Company ("ABC"), a metal building
manufacturer, in 1980. Mr. Schulte remained as President of the Mid-West
Metallic Division of ABC until 1984, when he left to form the Company. Mr.
Schulte has spent 44 years in the metal building industry.
 
    A. R. Ginn has served as a director and as Executive Vice President and
Chief Operating Officer of the Company, President and Chief Executive Officer of
the Metal Components Division and Chief Executive Officer of the Metal Coaters
Division since May 1998. Previously, he served as a director and the President
of MBCI since 1976 and was Chief Executive Officer of the Metal Coaters Division
of MBCI from 1987 to 1998. Mr. Ginn has over 40 years of experience in the metal
building and components industry. Mr. Ginn worked for four years with A&S Steel
Buildings and spent 14 years with Metallic Building Company, where he was Vice
President of Operations for seven years. Mr. Ginn is the father of Kelly R.
Ginn.
 
    Leonard F. George has served as a director of the Company since March 1993
and as an Executive Vice President of the Metal Buildings Division since May
1998. Previously, Mr. George served as Executive Vice President of the Company
since September 1992 and as the President of the A&S Division from October 1992
until December 1992. From 1987 to September 1992, Mr. George was employed as
President, Vice President of Engineering, Assistant Vice President of
Engineering and Regional Sales Manager of ABC. Mr. George has spent over 20
years in the metal building industry.
 
    Robert J. Medlock has served as Vice President and Chief Financial Officer
of the Company since February 1992 and as Vice President, Chief Financial
Officer and Treasurer of the Metal Buildings Division since May 1998. Mr.
Medlock served as the Chief Financial Officer and Treasurer of Enviropact, Inc.,
an environmental services company, from 1989 to 1991. He was the Vice President
and Chief Financial Officer of ABC from 1973 to 1978. After the acquisition of
ABC by Cronus, he became Vice President and Controller of Cronus and served in
that capacity from 1979 until 1981. Mr. Medlock is a certified public
accountant.
 
    Kenneth W. Maddox has served as a director and as Vice President of the
Company and Vice President and Chief Financial Officer of the Metal Components
Division and the Metal Coaters Division since May 1998. Previously, he served as
the Chief Financial Officer and Treasurer of MBCI since 1980. Mr. Maddox is a
certified public accountant.
 
    Donnie R. Humphries has been Secretary of the Company since 1985 and Vice
President, Human Relations of the Metal Buildings Division since May 1998. Mr.
Humphries previously served as Vice President, Human Relations of the Company
since 1997. Mr. Humphries was employed by Mid-West Steel
 
                                       49
<PAGE>
Buildings Co., Inc. from 1976 to 1980 and by ABC from 1980 to 1985. Mr.
Humphries has over 21 years of experience in the metal building industry.
 
    Thomas C. Arnett has served as a director of the Company since April 1989.
Mr. Arnett is currently retired and manages his own investments. Mr. Arnett was
an Executive Vice President of Cronus from 1977 to 1985 and served as a director
of Cronus from 1977 to 1988.
 
    William D. Breedlove has served as a director of the Company since March
1992. Mr. Breedlove has been Vice Chairman of Hoak Breedlove Wesneski & Co., an
investment banking firm, since August 1996. Previously, he served as Chairman
and Managing Director of Breedlove Wesneski & Co., a private merchant banking
firm, for over five years. In addition, Mr. Breedlove served as a director of
Cronus from 1984 to 1988.
 
    Gary L. Forbes has served as a director of the Company since December 1991.
Mr. Forbes has been a Vice President of Equus II Incorporated, an investment
company, since November 1991. Mr. Forbes is also a director of Consolidated
Graphics, Inc., a commercial printing company, Advanced Technical Products,
Inc., a manufacturer of high performance composite parts, and Drypers
Corporation, a manufacturer of disposable diapers. Mr. Forbes is a certified
public accountant.
 
    Robert N. McDonald has served as a director since March 1992. Mr. McDonald
was a marketing consultant for ABC from 1985 until February 1992 and served as a
director of that company from 1989 to 1990. From 1956 to 1970, Mr. McDonald was
employed by Butler Manufacturing Company, a metal building manufacturer, and
served as Vice President of Marketing for ABC from 1970 to 1978.
 
    Daniel D. Zabcik has been a director of the Company since April 1989 and
served as an Executive Vice President of the Company from April 1989 until
October 1993, when he resigned as an officer and assumed part-time employee
status. Since 1986, Mr. Zabcik has also served as a director of Southwest Bolt,
Inc., a distributor of structural bolts. From 1980 until April 1989, Mr. Zabcik
was employed as President, Executive Vice President and Vice Chairman of the
Mid-West Metallic division of ABC. Mr. Zabcik has spent over 40 years in the
metal building industry. Mr. Zabcik is a licensed engineer and served on the
Executive Committee of the MBMA in 1993.
 
    The Board of Directors is comprised of four Class I Directors, three Class
II Directors and three Class III Directors. The terms of the Class I, Class II,
and Class III directors will expire at the annual meeting of stockholders held
in 2000, 2001 and 1999, respectively. At each of those annual meetings and
thereafter, directors will be elected for a three-year term to succeed the
directors of the same class whose terms are then to expire. Officers of the
Company serve at the discretion of the Board of Directors.
 
    OTHER KEY MANAGERS:
 
    Jerry D. Boen has served as Vice President, Marketing of the Metal
Components Division since May 1998. Previously, he served as Vice President of
Marketing of MBCI since 1980. Prior to joining MBCI, Mr. Boen was a sales
manager for another building components company.
 
    David B. Curtis has served as President of the Doors & Building Components
Division of the Company since it was acquired from Doors & Building Components,
Inc. in November 1995. Mr. Curtis was the founder of Doors & Building
Components, Inc. and served as its President and Chief Executive Officer for
more than five years.
 
    Charles W. Dickinson has served as Vice President, Sales of the Metal
Components Division since May 1998. Previously, he served as Vice President of
Sales of MBCI since 1991 and was employed by MBCI for more than 16 years. Mr.
Dickinson has over 23 years of experience in the metal building and components
industry.
 
                                       50
<PAGE>
    John T. Eubanks has served as President of the Mesco Metal Buildings
Division of the Company since 1989. Mesco Metal Buildings was a division of
Anderson Industries, Inc. prior to April 1, 1996, at which time it was acquired
by a subsidiary of the Company.
 
    Kelly R. Ginn has served as Vice President, Manufacturing of the Metal
Components Divisions since May 1998. Previously, he served as Vice President of
Manufacturing of MBCI since 1990. Prior to joining MBCI in 1985, Mr. Ginn worked
as a Plant Superintendent for a large metal building manufacturer. Mr. Ginn has
19 years of experience in the metal building and components industry. Mr. Ginn
is the son of A.R. Ginn.
 
    John W. Holmes has served as President of the Metal Prep Division since May
1998. Previously, he served as President of Metal Prep, Inc., a subsidiary of
MBCI, since 1996. Mr. Holmes was employed by MBCI for over 16 years and served
as Sales Manager for two of MBCI's plants and as President of American Building
Company, a subsidiary of MBCI. Before joining MBCI in 1981, Mr. Holmes was a
Regional Manager for a metal building components manufacturer.
 
    Richard F. Klein has served as President and Chief Operating Officer of the
Metal Coaters Division since May 1998. Previously, he served as President of
Metal Coaters, Inc., a subsidiary of MBCI, since 1987. Before joining MBCI in
1987, Mr. Klein spent nine years as Vice President of a large coil coating
concern.
 
    Fredrick D. Koetting has been Vice President, Operations of the Metal
Building Division since May 1998. He previously served as a Vice President of
the Company since May 1994. Prior to joining the Company in May 1994, Mr.
Koetting served as an Account Manager for National Steel Corporation, a steel
supplier of the Company, from 1991 until May 1994. Mr. Koetting served as a
Manager of Customer Service for Granite City Steel, a division of National Steel
Corporation, from 1989 until 1991.
 
    Alvan E. Richey, Jr. has been Vice President, Sales and Marketing of the
Metal Buildings Division since May 1998. He previously served as Vice President,
Sales and Marketing of the Company since July 1995. Mr. Richey has also been
President of the A&S Division since December 1992. Prior to joining the Company
in September 1992, Mr. Richey was employed by ABC for over 22 years. Mr. Richey
has over 29 years of experience in the metal building industry.
 
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
   
    Southwest Bolt, Inc., a corporation of which Mr. Zabcik is a director and
owns 25% of the capital stock, is the Company's primary supplier of structural
bolts. In fiscal 1997, the Company made purchases from Southwest Bolt, Inc., in
the amount of $1.9 million.
    
 
                                       51
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
   
    The following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock, as of August 31, 1998 (the "Ownership
Date"), by (i) each person or group known by the Company to own beneficially
more than 5% of the outstanding shares of Common Stock, (ii) each director,
(iii) the Company's Chief Executive Officer and each of the Company's four other
most highly compensated executive officers for fiscal 1997, and (iv) all
directors and executive officers as a group. Except as otherwise indicated, each
of the persons or groups named below has sole voting power and investment power
with respect to such Common Stock.
    
   
<TABLE>
<CAPTION>
                                                                                                          SHARES OWNED
                                                                  SHARES OWNED BEFORE                       AFTER THE
                                                                    THE OFFERING(1)                        OFFERING(1)
                                                                 ---------------------   SHARES BEING    ---------------
NAME                                                               NUMBER     PERCENT       OFFERED          NUMBER
- ---------------------------------------------------------------  ----------  ---------      -------      ---------------
<S>                                                              <C>         <C>        <C>              <C>
Johnie Schulte, Jr.(2).........................................     933,698       5.1%
A. R. Ginn.....................................................     500,000       2.8%
Daniel D. Zabcik(3)............................................     312,010       1.7%
C.A. Rundell, Jr.(4)...........................................     256,218       1.4%
Kenneth W. Maddox..............................................     238,000       1.3%
Gary L. Forbes(5)..............................................     200,500       1.1%
Leonard F. George(6)...........................................     146,028          *
John T. Eubanks(7).............................................     125,250          *
Alvan E. Richey, Jr.(8)........................................      71,554          *
Robert J. Medlock(9)...........................................      61,948          *
Thomas C. Arnett(10)...........................................      40,574          *
William D. Breedlove(11).......................................      32,078          *
Robert N. McDonald(11).........................................      18,078          *
All directors and executive officers as a group (12
 persons)(12)..................................................   2,944,132      15.9%
 
<CAPTION>
NAME                                                                 PERCENT
- ---------------------------------------------------------------      -------
<S>                                                              <C>
Johnie Schulte, Jr.(2).........................................
A. R. Ginn.....................................................
Daniel D. Zabcik(3)............................................
C.A. Rundell, Jr.(4)...........................................
Kenneth W. Maddox..............................................
Gary L. Forbes(5)..............................................
Leonard F. George(6)...........................................
John T. Eubanks(7).............................................
Alvan E. Richey, Jr.(8)........................................
Robert J. Medlock(9)...........................................
Thomas C. Arnett(10)...........................................
William D. Breedlove(11).......................................
Robert N. McDonald(11).........................................
All directors and executive officers as a group (12
 persons)(12)..................................................
</TABLE>
    
 
- ------------------------------
 
*   Less than 1%
 
(1) Includes shares beneficially owned by such persons, including shares owned
    pursuant to the NCI 401(k) Profit Sharing Plan. If a person has the right to
    acquire beneficial ownership of any shares by exercise of options within 60
    days after the Ownership Date, such shares are deemed beneficially owned by
    such person and are deemed to be outstanding solely for the purpose of
    determining the percentage of the Common Stock that he owns. Such shares are
    not included in the computations for any other person.
 
(2) Includes options to purchase 168,666 shares held by Mr. Schulte that were
    exercisable within 60 days after the Ownership Date. Mr. Schulte also holds
    options to purchase an additional 77,500 shares that were not exercisable.
    The principal business address of Mr. Schulte is 7301 Fairview, Houston,
    Texas 77041.
 
   
(3) Includes 90,000 shares held in a testamentary trust, of which Mr. Zabcik is
    sole trustee, for the benefit of his children, 38,294 shares held by a
    family general partnership, of which Mr. Zabcik has management authority and
    options to purchase 40,500 shares held by Mr. Zabcik that were exercisable
    within 60 days after the Ownership Date. Mr. Zabcik also holds options to
    purchase an additional 3,500 shares that were not exercisable.
    
 
(4) Includes options to purchase 12,500 shares held by Mr. Rundell that were
    exercisable within 60 days after the Ownership Date. Mr. Rundell also holds
    options to purchase an additional 77,500 shares that were not exercisable.
 
(5) Includes 200,000 shares held by Equus II Incorporated, of which Mr. Forbes
    is a Vice President and may be deemed to share voting and investment power
    with respect to such shares. Mr. Forbes disclaims beneficial ownership of
    such shares. Also includes options to purchase 500 shares held by Mr. Forbes
    that were exercisable within 60 days after the Ownership Date. Mr. Forbes
    also holds options to purchase an additional 3,500 shares that were not
    exercisable.
 
(6) Includes options to purchase 146,028 shares held by Mr. George that were
    exercisable within 60 days after the Ownership Date. Mr. George also holds
    options to purchase an additional 65,500 shares that were not exercisable.
 
                                       52
<PAGE>
(7) Includes 100,250 shares issuable with respect to a convertible debenture
    that was exercisable as of the Ownership Date and options to purchase 25,000
    shares held by Mr. Eubanks that were exercisable within 60 days after the
    Ownership Date. Mr. Eubanks also holds options to purchase an additional
    45,000 shares that were not exercisable.
 
(8) Includes options to purchase 71,554 shares held by Mr. Richey that were
    exercisable within 60 days after the Ownership Date. Mr. Richey also holds
    options to purchase an additional 52,000 shares that were not exercisable.
 
(9) Includes options to purchase 61,948 shares held by Mr. Medlock that were
    exercisable within 60 days after the Ownership Date. Mr. Medlock also holds
    options to purchase an additional 49,000 shares that were not exercisable.
 
(10) Includes 40,074 shares held by La Plaza Partnership, of which Mr. Arnett is
    a general partner and may be deemed to share voting and investment power
    with respect to such shares. Also includes options to purchase 500 shares
    held by Mr. Arnett that were exercisable within 60 days after the Ownership
    Date. Mr. Arnett also holds options to purchase an additional 3,500 shares
    that were not exercisable.
 
   
(11) Includes options to purchase 12,078 and 18,078 shares held by Messrs.
    Breedlove and McDonald, respectively, that were exercisable within 60 days
    after the Ownership Date. Each of Messrs. Breedlove and McDonald also holds
    options to purchase an additional 3,500 shares that were not exercisable.
    
 
(12) In addition to the shares identified in notes (2) through (11), includes
    options to purchase 5,000 shares held by other officers that were
    exercisable within 60 days after the Ownership Date. These other officers
    also hold options to purchase an additional 5,000 shares that were not
    exercisable.
 
                                       53
<PAGE>
                                  UNDERWRITING
 
    The names of the Underwriters of the shares of Common Stock offered hereby
and the aggregate number of shares that each severally has agreed to purchase
from the Company and the Selling Stockholders, subject to the terms and
conditions specified in the Underwriting Agreement, are as follows:
 
<TABLE>
<CAPTION>
                                                                                     NUMBER OF
UNDERWRITER                                                                           SHARES
- ----------------------------------------------------------------------------------  -----------
<S>                                                                                 <C>
Warburg Dillon Read LLC...........................................................
J.C. Bradford & Co................................................................
Wheat First Securities, Inc.......................................................
Dain Rauscher Wessels.............................................................
                                                                                    -----------
  Total...........................................................................
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
    The Managing Underwriters are Warburg Dillon Read LLC, J.C. Bradford & Co.,
Wheat First Union, a division of Wheat First Securities, Inc., and Dain Rauscher
Wessels, a division of Dain Rauscher Incorporated ("Dain Rauscher Wessels").
 
    If any shares of Common Stock offered hereby are purchased by the
Underwriters, all such shares will be so purchased. The Underwriting Agreement
contains certain provisions whereby, if any Underwriter defaults in its
obligation to purchase such shares, and the aggregate obligations of the
Underwriters so defaulting do not exceed ten percent of the shares offered
hereby, the remaining Underwriters, or some of them, must assume such
obligations.
 
    The shares of Common Stock offered hereby are being initially offered
severally by the Underwriters for sale at the price set forth on the cover page
of this Prospectus or at such price less a concession not in excess of $
per share on sales to certain dealers. The Underwriters may allow, and such
dealers may re-allow, a concession not to exceed $      per share on sales to
certain other dealers. The Offering of shares is made for delivery when, as and
if accepted by the Underwriters and subject to prior sale and withdrawal,
cancellation or modification of the offer without notice. The Underwriters
reserve the right to reject any order for the purchase of the shares. After the
shares of Common Stock are released for sale to the public, the offering price
and such concessions may be changed by the Managing Underwriters.
 
    The Company and certain of the Selling Stockholders have granted to the
Underwriters an option, which may be exercised within 30 days after the date of
this Prospectus, to purchase up to an additional 570,000 shares of Common Stock
to cover over-allotments, if any, on the same terms per share. To the extent the
Underwriters exercise this option, each of the Underwriters will be obligated,
subject to certain conditions, to purchase the number of additional shares of
Common Stock proportionate to such Underwriter's initial commitment.
 
    The Company and certain of the Selling Stockholders have agreed in the
Underwriting Agreement to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act, or to contribute to
payments that the Underwriters may be required to make in respect thereof.
 
    The Company, each of its directors and members of the senior management team
(other than, with respect to shares of Common Stock included in the Offering,
the Selling Stockholders) and certain of the Company's principal stockholders
have agreed that they will not sell, contract to sell, grant any option to sell
or otherwise dispose of, directly or indirectly, any shares of Common Stock, or
securities convertible into or exercisable or exchangeable for, any shares of
Common Stock or warrants or other rights to
 
                                       54
<PAGE>
purchase shares of Common Stock, or permit the registration of any shares of
Common Stock for a period of 90 days after the date of this prospectus, without
the prior consent of Warburg Dillon Read LLC, except that the Company may issue
shares of Common Stock upon exercise of outstanding options and in connection
with acquisition transactions and may issue options to purchase shares of Common
Stock pursuant to its Employee Stock Option Plan.
 
    Warburg Dillon Read LLC acted as financial advisor to the Company in
connection with the MBCI Acquisition and provided a fairness opinion to the
Company in such capacity, for which it received customary fees and reimbursement
of expenses. In connection with the Company's repayment of the 364-Day Revolver
with the net proceeds of the Offering, UBS AG and First Union National Bank,
lenders for the 364-Day Revolver and affiliates of Warburg Dillon Read LLC and
Wheat First Union, respectively, may receive more than 10% of the proceeds of
the Offering. Accordingly, the Offering is being made in compliance with Rule
2710(c)(8) of the conduct Rules of the National Association of Securities
Dealers, Inc. Certain Underwriters and their affiliates have provided from time
to time, and expect to provide in the future, investment or financial services
to the Company, for which such Underwriters or their affiliates have received or
will receive customary fees and commissions. C.A. Rundell, Jr., the Company's
Chairman of the Board, is a director of Dain Rauscher Corporation, the parent
company of Dain Rauscher Incorporated.
 
    The Managing Underwriters, on behalf of the Underwriters, may engage in
over-allotment, stabilizing transactions, syndicate covering transactions and
penalty bids in accordance with Regulation M under the Exchange Act.
Over-allotment involves syndicate sales in excess of the offering size, which
creates a syndicate short position. Stabilizing transactions permit bids to
purchase the underlying security so long as the stabilizing bids do not exceed a
specified maximum. Syndicate covering transactions involve purchases of the
Common Stock in the open market after the distribution has been completed in
order to cover syndicate short positions. Penalty bids permit the Managing
Underwriters to reclaim a selling concession from a syndicate member when the
Common Stock originally sold by such syndicate member is purchased in a
syndicate covering transaction to cover syndicate short positions. Such
stabilizing transactions, syndicate covering transactions and penalty bids may
cause the price of the Common Stock to be higher than it would otherwise be in
the absence of such transactions. These transactions may be effected on Nasdaq
or otherwise and, if commenced, may be discontinued at any time.
 
                                 LEGAL MATTERS
 
    The validity of the share of Common Stock offered hereby is being passed
upon for the Company and the Selling Stockholders by Gardere & Wynne, L.L.P.,
Dallas, Texas. Certain legal matters will be passed upon for the Underwriters by
Gibson, Dunn & Crutcher LLP, New York, New York. Partners of Gardere & Wynne,
L.L.P., who participated in the preparation of this Prospectus and Registration
Statement beneficially own an aggregate of 14,000 shares of Common Stock.
 
                                    EXPERTS
 
    The consolidated financial statements of (i) NCI as of October 31, 1996 and
1997, and for each of the three years in the period ended October 31, 1997, and
(ii) Amatek as of December 31, 1996 and 1997, and for each of the three years in
the period ended December 31, 1997, appearing in this Prospectus and
Registration Statement, have been audited by Ernst & Young LLP, independent
auditors, as set forth in their reports thereon appearing elsewhere in this
Prospectus and Registration Statement and are included in reliance upon such
reports given upon the authority of such firm as experts in accounting and
auditing.
 
                             AVAILABLE INFORMATION
 
    The Company is subject to the information requirements of the Exchange Act,
and in accordance therewith files periodic reports, proxy statements and other
information with the Commission. Reports,
 
                                       55
<PAGE>
proxy statements and other information may be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549 and at the regional
offices of the Commission located at Seven World Trade Center, 13th Floor, New
York, New York 10048 and Suite 1400, Northwestern Atrium Center, 14th Floor, 500
West Madison Street, Chicago, Illinois 60661. Copies of such material may also
be obtained at prescribed rates by writing to the Commission, Public Reference
Section, 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549, and
such information may also be inspected at the offices of the National
Association of Securities Dealers, Inc., Listing Section, 1735 K Street,
Washington, D.C. 20006. The Commission maintains a Web site that contains
reports, proxy and information statements and other information regarding
registrants that file electronically with the Commission. Such reports, proxy
and information statements and other information may be found on the
Commission's Web site address, HTTP://WWW.SEC.GOV.
 
    The Company has filed with the Commission a registration statement on Form
S-3 (together with all exhibits, schedules, amendments and supplements thereto,
the "Registration Statement") under the Securities Act with respect to the
Common Stock offered hereby. This Prospectus does not contain all the
information set forth or incorporated by reference in the Registration Statement
(certain parts of which have been omitted in accordance with the rules and
regulations of the Commission). Statements contained in this Prospectus as to
the contents of any contract or any other document referred to are not
necessarily complete, and each such statement is qualified in all respects by
reference to the copy of such contract or document filed as an exhibit to the
Registration Statement. For further information with respect to the Company and
the Common Stock reference is made to the Registration Statement and the
exhibits and schedules filed as a part thereof, which may be inspected and
copied at the Public Reference Section of the Commission at 450 Fifth Street,
N.W., Room 1024, Judiciary Plaza, Washington, D. C. 20549, and its public
reference facilities in New York, New York and Chicago, Illinois at prescribed
rates.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
   
    The following documents or portions thereof filed by the Company with the
Commission (Commission File No. 0-14315) pursuant to the Exchange Act are hereby
incorporated by reference in this Prospectus:
    
 
   
        (i) the Company's Annual Report on Form 10-K for the fiscal year ended
    October 31, 1997, including the information required by Item 402 (executive
    compensation) from the Company's Proxy Statement dated January 30, 1998,
    filed in definitive form on January 28, 1998;
    
 
   
        (ii) the Company's Quarterly Reports on Form 10-Q for the fiscal
    quarters ended January 31, April 30 and July 31, 1998;
    
 
   
       (iii) the Company's Current Report on Form 8-K dated May 4, 1998, and
    filed with the Commission on May 19, 1998, with respect to the MBCI
    Acquisition, as amended by Current Report on Form 8-K/A filed with the
    Commission on July 20, 1998, and Current Report on Form 8-K/A, Amendment No.
    2, filed with the Commission on August 5, 1998 and Current Report on Form
    8-K/A, Amendment No. 3, filed with the Commission on August 25, 1998;
    
 
        (iv) the Company's Current Report on Form 8-K dated June 24, 1998, and
    filed with the Commission on July 9, 1998, with respect to the dividend of
    preferred stock purchase rights; and
 
   
        (v) the description of the Company's Common Stock contained in the
    Company's Registration Statement on Form 8-A filed with the Commission on
    July 20, 1998; and
    
 
   
        (vi) the Company's Current Report on Form 8-K dated and filed with the
    Commission on August 21, 1998, with respect to the Company's audited
    consolidated financial statements.
    
 
    All reports and documents subsequently filed by the Company pursuant to
Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this
Prospectus and prior to the termination of the offering of
 
                                       56
<PAGE>
Common Stock made hereby shall be deemed to be incorporated by reference into
this Prospectus and to be a part hereof from the filing of such documents. Any
statement contained in this Prospectus or in a document incorporated or deemed
to be incorporated by reference in this Prospectus shall be deemed to be
modified or superseded for the purposes of this Prospectus to the extent that a
statement contained herein or in any other subsequently filed document that also
is or is deemed to be incorporated by reference herein modifies or supersedes
such statement. Any such statement so modified or superseded shall not be
deemed, except as so modified or superseded, to constitute a part of the
Registration Statement or this Prospectus.
 
    The Company will provide without charge to each person to whom a copy of
this Prospectus is delivered, upon oral or written request of such person, a
copy of any and all of the documents incorporated by reference herein (other
than exhibits and schedules to such documents, unless such exhibits or schedules
are specifically incorporated by reference into such documents). Such requests
should be directed to Robert J. Medlock, Vice President and Chief Financial
Officer, NCI Building Systems, Inc., 7301 Fairview, Houston, Texas 77041, or by
telephone at (713) 466-7788.
 
                                       57
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
   
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Consolidated Financial Statements of the Company:
  Report of Ernst & Young LLP..............................................................................        F-2
  Consolidated Balance Sheets--October 31, 1996 and 1997, and July 31, 1998 (Unaudited)....................        F-3
  Consolidated Statements of Income--Years Ended October 31, 1995, 1996 and 1997, and for the Nine Months
    Ended July 31, 1997 and 1998 (Unaudited)...............................................................        F-4
  Consolidated Statements of Shareholders' Equity--Years Ended October 31, 1995, 1996 and 1997, and for the
    Nine Months Ended July 31, 1998 (Unaudited)............................................................        F-5
  Consolidated Statements of Cash Flows--Years Ended October 31, 1995, 1996 and 1997 and for the Nine
    Months Ended July 31, 1997 and 1998 (Unaudited)........................................................        F-6
  Notes to Consolidated Financial Statements...............................................................        F-7
 
Consolidated Financial Statements of Amatek
  Report of Ernst & Young LLP..............................................................................       F-16
  Consolidated Balance Sheets--December 31, 1996 and 1997, and March 31, 1998 (Unaudited)..................       F-17
  Consolidated Statements of Operations--Years Ended December 31, 1995, 1996 and 1997, and for the Three
    Months Ended March 31, 1997 and 1998 (Unaudited).......................................................       F-18
  Consolidated Statements of Cash Flows--Years Ended December 31, 1995, 1996 and 1997, and for the Three
    Months Ended March 31, 1997 and 1998 (Unaudited).......................................................       F-19
  Consolidated Statements of Stockholder's Equity--Years Ended December 31, 1995, 1996 and 1997, and for
    the Three Months Ended March 31, 1998 (Unaudited)......................................................       F-20
  Notes to Consolidated Financial Statements...............................................................       F-21
</TABLE>
    
 
                                      F-1
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Directors and Shareholders
 
NCI Building Systems, Inc.
 
    We have audited the accompanying consolidated balance sheets of NCI Building
Systems, Inc. as of October 31, 1997 and 1996, and the related consolidated
statements of income, shareholders' equity and cash flows for each of the three
years in the period ended October 31, 1997. These financial statements are the
responsibility of the Company'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 consolidated financial position of NCI Building
Systems, Inc. at October 31, 1997 and 1996 and the consolidated results of its
operations and its cash flows for each of the three years in the period ended
October 31, 1997, in conformity with generally accepted accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
 
                                          ERNST & YOUNG LLP
 
Houston, Texas
December 8, 1997
except for Note 9, as to which the date is
July 31, 1998
 
                                      F-2
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                   OCTOBER 31,
                                                                              ----------------------
                                                                                 1996        1997
                                                                              ----------  ----------   JULY 31,
                                                                                                         1998
                                                                                                      -----------
                                                                                                      (UNAUDITED)
<S>                                                                           <C>         <C>         <C>
                                               ASSETS
Current assets:
  Cash and cash equivalents.................................................  $   20,944  $   32,166   $   4,477
  Accounts receivable--Trade................................................      35,477      45,946      90,382
  Other receivables--Note 11................................................       2,272       1,060       1,730
  Inventories--Note 1.......................................................      28,693      37,381      74,686
  Deferred income taxes--Note 5.............................................       2,925       3,463       6,183
  Prepaid expenses..........................................................         299         942       4,480
                                                                              ----------  ----------  -----------
  Total current assets......................................................      90,610     120,958     181,938
Property, plant and equipment, net--Note 1..................................      42,752      51,223     166,034
Other assets:
  Excess of cost over fair value of acquired net assets--Note 1.............      22,673      21,072     433,340
  Other.....................................................................       2,292       3,079      28,240
                                                                              ----------  ----------  -----------
  Total other assets........................................................      24,965      24,151     461,580
                                                                              ----------  ----------  -----------
Total assets................................................................  $  158,327  $  196,332   $ 809,552
                                                                              ----------  ----------  -----------
                                                                              ----------  ----------  -----------
 
                                LIABILITIES AND SHAREHOLDERS' EQUITY
 
Current liabilities:
  Current portion of long-term debt.........................................  $       48  $       47   $  30,047
  Accounts payable..........................................................      21,527      23,921      43,801
  Accrued compensation and benefits.........................................       7,762       9,688       9,031
  Other accrued expense.....................................................       6,738       8,538      27,943
  Accrued income taxes......................................................       2,577       2,018       2,278
                                                                              ----------  ----------  -----------
  Total current liabilities.................................................      38,652      44,212     113,100
Long-term debt, noncurrent portion--Note 3..................................       1,730       1,679     470,041
Deferred income taxes--Note 5...............................................       1,770       2,626      16,931
                                                                              ----------  ----------  -----------
Contingencies--Note 8
Shareholders' equity--Note 7
  Preferred stock, $1 par value, 1,000 shares authorized, none
    outstanding.............................................................      --          --          --
  Common stock, $.01 par value, 25,000 shares authorized, 15,934, 16,251 and
    18,034 shares issued and outstanding, respectively......................          80          82         180
  Additional paid-in capital................................................      47,358      51,109      89,130
  Retained earnings.........................................................      68,737      96,624     120,170
                                                                              ----------  ----------  -----------
  Total shareholders' equity................................................     116,175     147,815     209,480
                                                                              ----------  ----------  -----------
Total liabilities and shareholders' equity..................................  $  158,327  $  196,332   $ 809,552
                                                                              ----------  ----------  -----------
                                                                              ----------  ----------  -----------
</TABLE>
    
 
                      See Independent Auditor's Report and
          Accompanying Notes to the Consolidated Financial Statements.
 
                                      F-3
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
                       CONSOLIDATED STATEMENTS OF INCOME
                   (IN THOUSANDS, EXCEPT FOR PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                             NINE MONTHS ENDED
                                                                  OCTOBER 31,                     JULY 31,
                                                       ----------------------------------  ----------------------
                                                          1995        1996        1997        1997        1998
                                                       ----------  ----------  ----------  ----------  ----------
                                                                                                (UNAUDITED)
<S>                                                    <C>         <C>         <C>         <C>         <C>
Sales................................................  $  234,215  $  332,880  $  407,751  $  286,996  $  422,219
Cost of sales........................................     169,815     241,374     299,407     211,118     309,452
                                                       ----------  ----------  ----------  ----------  ----------
  Gross profit.......................................      64,400      91,506     108,344      75,878     112,767
                                                       ----------  ----------  ----------  ----------  ----------
Operating expenses...................................      38,111      53,095      66,055      47,922      64,084
Nonrecurring acquisition expense.....................      --          --          --          --           2,060
                                                       ----------  ----------  ----------  ----------  ----------
  Income from operations.............................      26,289      38,411      42,289      27,956      46,623
Interest expense.....................................         (56)       (108)       (163)       (125)    (10,307)
Other income.........................................         822       1,586       1,999       1,251       2,424
                                                       ----------  ----------  ----------  ----------  ----------
  Income before income taxes.........................      27,055      39,889      44,125      29,082      38,740
                                                       ----------  ----------  ----------  ----------  ----------
Provision (benefit) for income taxes--Note 5
  Current............................................      10,493      15,899      15,920      10,760      15,239
  Deferred...........................................        (470)       (823)        318          17         (45)
                                                       ----------  ----------  ----------  ----------  ----------
Total income tax.....................................      10,023      15,076      16,238      10,777      15,194
                                                       ----------  ----------  ----------  ----------  ----------
Net income...........................................  $   17,032  $   24,813  $   27,887  $   18,305  $   23,546
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
Net income per share--Basic--Note 9..................  $     1.36  $     1.60  $     1.73  $     1.14  $     1.39
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
Net income per share--Diluted--Note 9................  $     1.26  $     1.51  $     1.64  $     1.08  $     1.31
                                                       ----------  ----------  ----------  ----------  ----------
                                                       ----------  ----------  ----------  ----------  ----------
</TABLE>
    
 
                      See Independent Auditor's Report and
          Accompanying Notes to the Consolidated Financial Statements.
 
                                      F-4
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                               ADDITIONAL
                                                                    COMMON       PAID-IN     RETAINED   SHAREHOLDERS'
                                                                     STOCK       CAPITAL     EARNINGS      EQUITY
                                                                  -----------  -----------  ----------  -------------
<S>                                                               <C>          <C>          <C>         <C>
Balance, October 31, 1994.......................................   $      62    $  12,729   $   26,891   $    39,682
Proceeds from exercise of stock options, including tax benefit
  thereon.......................................................                      145       --               145
Shares issued for contribution to 401(k) plan...................           1          822       --               823
Net income......................................................      --           --           17,032        17,032
                                                                       -----   -----------  ----------  -------------
Balance, October 31, 1995.......................................          63       13,696       43,923        57,682
Proceeds from stock offering....................................          11       24,759       --            24,770
Proceeds from exercise of stock options, including tax benefit
  thereon.......................................................           2        2,723       --             2,725
Shares issued for contribution to 401(k) plan...................           1        1,008       --             1,009
Shares issued in connection with the purchase of DBCI...........           3        5,172       --             5,175
Net income......................................................      --           --           24,814        24,814
                                                                       -----   -----------  ----------  -------------
Balance, October 31, 1996.......................................          80       47,358       68,737       116,175
Proceeds from exercise of stock options, including tax benefit
  thereon.......................................................           1        2,234       --             2,235
Shares issued for contribution to 401(k) plan...................           1        1,517       --             1,518
Net income......................................................      --           --           27,887        27,887
                                                                       -----   -----------  ----------  -------------
Balance, October 31, 1997.......................................          82       51,109       96,624       147,815
Two-for-one split of common stock...............................          82          (82)      --           --
Shares issued in connection with the purchase of Metal Building
  Components, Inc. .............................................          14       32,186       --            32,200
Proceeds from exercise of stock options, including tax benefit
  thereon.......................................................           1        3,958       --             3,959
Shares issued for contribution to 401(k) plan...................           1        1,959       --             1,960
Net income......................................................      --           --           23,546        23,546
                                                                       -----   -----------  ----------  -------------
Balance, July 31, 1998 (unaudited)..............................         180       89,130      120,170       209,480
                                                                       -----   -----------  ----------  -------------
                                                                       -----   -----------  ----------  -------------
</TABLE>
    
 
                      See Independent Auditor's Report and
          Accompanying Notes to the Consolidated Financial Statements.
 
                                      F-5
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                               NINE MONTHS ENDED
                                                                       OCTOBER 31,                  JULY 31,
                                                             -------------------------------  --------------------
                                                               1995       1996       1997       1997       1998
                                                             ---------  ---------  ---------  ---------  ---------
                                                                                                  (UNAUDITED)
<S>                                                          <C>        <C>        <C>        <C>        <C>
Cash flows from operating activities
  Net income...............................................  $  17,032  $  24,814  $  27,887     18,305     23,546
  Adjustments to reconcile net income to net cash provided
    by operating activities
    Depreciation and amortization..........................      3,226      5,791      7,876      5,906     11,065
    (Gain)/loss on sale of fixed assets....................          4          2         (3)        (3)       (16)
    Provision for doubtful accounts........................      1,101        681      1,223        861      1,809
    Deferred income tax (benefit)/provision................       (470)      (823)       318        (45)      (188)
  Changes in current assets and liability accounts net of
    effects of acquisitions:
  Increase in accounts, notes and other receivable.........     (3,097)    (9,857)   (10,481)    (4,018)    (1,607)
  Increase (decrease) in inventories.......................     (2,483)    (4,521)    (5,552)    (6,297)     2,677
  (Increase) decrease in prepaid expenses..................         97        (35)      (625)      (509)      (157)
  Increase (decrease) in accounts payable..................     (2,009)     3,043      2,394      4,794     21,115
  Increase in accrued expenses.............................      4,858      1,603      5,244      3,342     (8,533)
  Increase (decrease) in income taxes payable..............       (245)     3,843        335        264      1,910
                                                             ---------  ---------  ---------  ---------  ---------
    Net cash provided by operating activities..............     18,014     24,541     28,616     22,600     51,621
                                                             ---------  ---------  ---------  ---------  ---------
Cash flows from investing activities:
  Proceeds from the sale of fixed assets...................          7        115         25         25         76
  Acquisition of Royal Buildings...........................       (910)    --         --         --         --
  Acquisition of Mesco Metal Buildings.....................     --        (20,631)    --         --         --
  Acquisition of Doors & Building Components, Inc. ........     --        (11,000)    --         --         --
  Acquisition of Carlisle Engineered Metals, Inc. .........     --         (2,840)    (6,230)    (6,230)    --
  Acquisition of Metal Building Components, Inc. ..........     --         --         --         --       (553,265)
  Acquisition of California Finished Metals, Inc. .........     --         --         --         --        (15,458)
  (Increase) decrease in other noncurrent assets...........          8     (1,988)    (1,147)    (2,695)    (3,908)
  Capital expenditures.....................................     (5,837)   (10,319)   (11,332)    (5,376)    (7,426)
                                                             ---------  ---------  ---------  ---------  ---------
    Net cash applied to investing activities...............     (6,732)   (46,663)   (18,684)   (14,276)  (579,981)
                                                             ---------  ---------  ---------  ---------  ---------
Cash flows from financing activities:
  Net proceeds from sale of stock..........................     --         24,770     --         --         --
  Exercise of stock options................................         71        750      1,340        931      2,310
  Borrowings on line of credit and notes...................     --         --         --         --        578,900
  Principal payments on long-term debt, line of credit and
    notes payable..........................................        (47)       (85)       (50)        23    (80,539)
                                                             ---------  ---------  ---------  ---------  ---------
    Net cash provided by (used in) financing activities....         24     25,435      1,290        954    500,671
                                                             ---------  ---------  ---------  ---------  ---------
    Net increase (decrease) in cash........................     11,306      3,313     11,222      9,278    (27,689)
Cash beginning of period...................................      6,325     17,631     20,944     20,944     32,166
                                                             ---------  ---------  ---------  ---------  ---------
Cash at end of period......................................  $  17,631  $  20,944  $  32,166  $  30,222  $   4,477
                                                             ---------  ---------  ---------  ---------  ---------
                                                             ---------  ---------  ---------  ---------  ---------
</TABLE>
    
 
                      See Independent Auditor's Report and
          Accompanying Notes to the Consolidated Financial Statements.
 
                                      F-6
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
(A) REPORTING ENTITY
 
    These financial statements include the operations and activities of NCI
Building Systems, Inc. and its wholly-owned subsidiaries (Company) after the
elimination of all material intercompany accounts and balances. The Company
designs, manufactures and markets metal building systems and components for
commercial, industrial, agricultural and community service use. The Company
recognizes revenues as jobs are shipped.
 
(B) ACCOUNTS RECEIVABLE
 
   
    The Company reports accounts receivable net of the allowance for doubtful
accounts of $1,971,000, $1,629,000 and $1,498,000 at July 31, 1998, October 31,
1996 and 1997, respectively. Trade accounts receivable are the result of sales
of buildings and components to customers throughout the United States and
affiliated territories including international builders who resell to end users.
Although the Company's sales historically have been concentrated in Texas and
surrounding states, in recent years it has been expanding its authorized builder
organization and customer base into the midwestern states and, to a lesser
extent, into south central, southeastern and coastal states. All sales are
denominated in United States dollars. Credit sales do not normally require a
pledge of collateral; however, various types of liens may be filed to enhance
the collection process. Company management is not aware of any significant
concentrations of credit or market risks related to receivables or other
financial instruments reported in these financial statements.
    
 
(C) INVENTORIES
 
    Inventories are stated at the lower of cost or market value, using specific
identification for steel coils and the weighted-average method for other raw
materials. A summary of inventories follows (in thousands):
 
   
<TABLE>
<CAPTION>
                                                                 OCTOBER 31,
                                                             --------------------
                                                               1996       1997
                                                             ---------  ---------   JULY 31,
                                                                                      1998
                                                                                   -----------
                                                                                   (UNAUDITED)
<S>                                                          <C>        <C>        <C>
Raw materials..............................................  $  21,515  $  28,943   $  54,134
Work-in-process and finished goods.........................      7,178      8,438      20,552
                                                             ---------  ---------  -----------
                                                             $  28,693  $  37,381   $  74,686
                                                             ---------  ---------  -----------
                                                             ---------  ---------  -----------
</TABLE>
    
 
(D) PROPERTY, PLANT AND EQUIPMENT
 
   
    Property, plant and equipment are stated at cost and depreciated over their
estimated useful lives. Depreciation is computed using the straight-line method
for financial reporting purposes and both straight-line and accelerated methods
for income tax purposes. Depreciation expense for the nine months
    
 
                                      F-7
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
ended July 31, 1998 and the years ended October 31, 1995, 1996, and 1997 was
$11,065,000, $2,995,000, $4,236,000, and $5,893,000, respectively.
    
 
   
<TABLE>
<CAPTION>
                                                                OCTOBER 31,
                                                          -----------------------
                                                             1996         1997
                                                          -----------  ----------
                                                                                    JULY 31,
                                                                                      1998
                                                                                   -----------
                                                                     (IN THOUSANDS)(UNAUDITED)
<S>                                                       <C>          <C>         <C>
Land....................................................   $   3,174   $    3,969   $  11,184
Buildings and improvements..............................      20,136       23,600      69,872
Machinery, equipment and furniture......................      31,866       41,393     105,593
Transportation equipment................................         911        1,089       4,687
Computer software.......................................         156          481         448
                                                          -----------  ----------  -----------
                                                           $  56,243   $   70,532   $ 191,784
                                                          -----------  ----------  -----------
Less accumulated depreciation...........................     (13,492)     (19,309)    (25,750)
                                                          -----------  ----------  -----------
                                                           $  42,751   $   51,223   $ 166,034
                                                          -----------  ----------  -----------
                                                          -----------  ----------  -----------
</TABLE>
    
 
<TABLE>
<S>                                                               <C>
Estimated useful lives for depreciation are:
                                                                       10-20
Buildings and improvements......................................       years
Machinery, equipment and furniture..............................  5-10 years
Transportation equipment........................................  3-10 years
Computer software...............................................     5 years
</TABLE>
 
(E) CASH FLOWS STATEMENT
 
   
    For purposes of the cash flows statement, the Company considers all highly
liquid investments with an original maturity date of three months or less to be
cash equivalents. Total interest paid for the nine months ended July 31, 1998
and the years ended October 31, 1995, 1996 and 1997 was $3,940,000, $56,000,
$108,000 and $163,000, respectively. Income taxes paid for the nine months ended
July 31, 1998 and the years ended October 31, 1995, 1996 and 1997 was
$12,363,000, $11,033,000, $12,763,000 and $15,776,000 respectively. Non-cash
investing or financing activities included: $1,518,000 for the 1996 contribution
for the 401k plan which was paid in common stock in 1997, and $1,009,000 for the
1995 contribution for the 401k plan which was paid in common stock in 1996.
    
 
(F) EXCESS OF COST OVER FAIR VALUE OF ACQUIRED NET ASSETS
 
   
    Excess of cost over fair value of acquired net assets is amortized on a
straight-line basis over fifteen years. Accumulated amortization as of July 31,
1998 was $4,557,000, as of October 31, 1997 was $3,042,000 and as of October 31,
1996 was $1,441,000. The carrying value of goodwill is reviewed if the facts and
circumstances suggest that it may be impaired. If this review indicates that
goodwill will not be recoverable, as determined based on the undiscounted cash
flows of the entity acquired over the remaining amortization period, the
Company's carrying value of the goodwill would be reduced by the estimated
shortfall of cash flows.
    
 
                                      F-8
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
(G) USE OF ESTIMATES
 
    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
(H) ADVERTISING COSTS
 
   
    Advertising costs are expensed as incurred. Advertising expense was
$1,844,000, $1,196,000, $1,267,000 and $1,416,000 for the nine months ended July
31, 1998 and for the years ended October 31, 1995, 1996 and 1997, respectively.
    
 
(I) LONG-LIVED ASSETS
 
    In fiscal 1997, the Company adopted SFAS No. 121, ACCOUNTING FOR THE
IMPAIRMENT OF LONG-LIVED ASSETS AND FOR LONG-LIVED ASSETS TO BE DISPOSED OF.
Impairment losses are recognized when indicators of impairment are present and
the estimated undiscounted cash flows are not sufficient to recover the assets
carrying amount. Assets held for disposal are measured at the lower of carrying
value or estimated fair value, less costs to sell. The effect of adopting SFAS
No. 121 was not material to the financial statements.
 
(J) STOCK-BASED COMPENSATION
 
    In October 1995, the FASB issued Statement No. 123, ACCOUNTING FOR
STOCK-BASED COMPENSATION, which encourages companies to apply a new fair value
approach allowing the recognition of compensation cost related to stock options
using an option pricing model. Under Statement No. 123, companies are permitted
to continue using current accounting rules for employee stock options, but are
required to disclose pro forma net income and earnings per share information as
if the new fair value approach had been adopted. The Company has elected to
continue to use the intrinsic value method under Accounting Principles Board
Opinion No. 25 ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES (APB 25) and related
Interpretations in accounting for its employee stock options. The pro forma
information regarding net income and earnings per share, as required by
Statement No. 123, has been disclosed as if the Company had accounted for its
employee stock options under the fair value method of that Statement.
 
   
(K) PENDING ACCOUNTING CHANGES
    
 
    In June 1997, the Financial Accounting Standards Board issued Statement No.
131, DISCLOSURES ABOUT SEGMENTS OF AN ENTERPRISE AND RELATED INFORMATION, which
is effective for the Company's fiscal year ending October 31, 1999. The Company
does not anticipate that the adoption of this standard will have a material
impact on the financial statements.
 
(2) NOTES PAYABLE (SHORT-TERM BORROWINGS)
 
    The Company has a revolving unsecured credit line of $6 million with a bank
bearing interest that fluctuates with prime, (commitment fee 1/4% on unused
portion) all of which was unused at October 31, 1996 and 1997, respectively. The
revolving credit line expires in February, 1999.
 
                                      F-9
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(3) LONG-TERM DEBT
   
<TABLE>
<CAPTION>
                                                                   OCTOBER 31,
                                                               --------------------   JULY 31,
                                                                 1996       1997        1998
                                                               ---------  ---------  -----------
<S>                                                            <C>        <C>        <C>
                                                                                     (UNAUDITED)
 
<CAPTION>
                                                                        (IN THOUSANDS)
<S>                                                            <C>        <C>        <C>
Six year reducing revolving credit line of $.7 million with a
  bank bearing interest that fluctuates with prime, with
  $73,000 quarterly reducing borrowing base..................  $  --      $  --       $  --
 
Five year revolving credit line with a bank bearing interest
  at variable rates (effective rate of 7.7% at July 31, 1998)
  maturing at July 1, 2003...................................     --         --          98,388
 
Five year term loan payable to a bank bearing interest at
  LIBOR plus 2% (7.89% at July 31, 1998), repayable in
  successive quarterly installments beginning on October 31,
  1998, in quarterly payments beginning with $7.5 million and
  gradually increasing to $12.5 million on the maturity
  date.......................................................     --         --         200,000
 
364-day revolving credit facility with a bank bearing
  interest at variable rates (effective rate of 7.7% at July
  31, 1998) maturing on May 3, 1999..........................     --         --         200,000
 
Notes payable to City of Mattoon bearing interest at 3%
  secured by certain equipment, repayable in aggregate
  monthly installments of $4,828 maturing through November
  2001.......................................................        277        226         200
 
Note payable to employee bearing interest at 7% maturing
  April 1, 2001, with an option to convert into common stock
  at $14.9625 per share......................................      1,500      1,500       1,500
                                                               ---------  ---------  -----------
 
                                                                   1,777      1,726     500,088
 
Current portion of long-term debt............................        (47)       (47)    (30,047)
                                                               ---------  ---------  -----------
 
                                                               $   1,730  $   1,679   $ 470,041
                                                               ---------  ---------  -----------
                                                               ---------  ---------  -----------
</TABLE>
    
 
                                      F-10
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(3) LONG-TERM DEBT (CONTINUED)
   
    Aggregate required principal reductions as of October 31, 1997 are as
follows (in thousands):
    
 
<TABLE>
<CAPTION>
YEAR ENDED OCTOBER 31,
- -------------------------------------------------------------------------------------
<S>                                                                                    <C>
1998.................................................................................  $      47
1999.................................................................................         53
2000.................................................................................         55
2001.................................................................................      1,557
2002.................................................................................         14
                                                                                       ---------
                                                                                       $   1,726
                                                                                       ---------
                                                                                       ---------
</TABLE>
 
    The loan agreements related to the revolving line and short-term borrowings
contain, among other things, provisions relative to additional borrowings and
restrictions on the amount of retained earnings available for the payment of
dividends and the repurchase of common stock and provisions requiring the
maintenance of certain net worth and other financial ratios.
 
    Under the most restrictive of these covenants, such dividends or stock
repurchases are limited to 20% of the Company's net income for any 12-month
period, which is further restricted on a quarterly basis, based on the ratio of
cash flow (net income plus depreciation and amortization) for the previous
12-month period to current maturities of long-term debt plus dividends and stock
repurchases.
 
    The carrying amount of the Company's long-term debt approximates its fair
value.
 
(4) RELATED PARTY TRANSACTIONS
 
   
    During the nine months ended July 31, 1998 and in the years ended October
31, 1995, 1996 and 1997, the Company purchased $1,307,000, $1,053,000,
$1,417,000 and $1,869,000 respectively, of materials from a related party under
arm's length transactions.
    
 
(5) INCOME TAXES
 
    Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes.
 
                                      F-11
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(5) INCOME TAXES (CONTINUED)
    Taxes on income from continuing operations consist of the following (in
thousands):
 
   
<TABLE>
<CAPTION>
                                                                           NINE MONTHS ENDED
                                             YEAR ENDED OCTOBER 31,             JULY 31,
                                         -------------------------------  --------------------
                                           1995       1996       1997       1997       1998
                                         ---------  ---------  ---------  ---------  ---------
                                                                              (UNAUDITED)
<S>                                      <C>        <C>        <C>        <C>        <C>
Current:
  Federal..............................  $   9,733  $  14,531  $  15,479  $  10,179  $  14,077
  State................................        760      1,368        441        581      1,162
                                         ---------  ---------  ---------  ---------  ---------
Total current..........................     10,493     15,899     15,920     10,760     15,239
Deferred:
  Federal..............................       (445)      (746)       304         16        (42)
  State................................        (25)       (77)        14          1         (3)
                                         ---------  ---------  ---------  ---------  ---------
Total deferred.........................       (470)      (823)       318         17        (45)
                                         ---------  ---------  ---------  ---------  ---------
Total provision........................  $  10,023  $  15,076  $  16,238  $  10,777  $  15,194
                                         ---------  ---------  ---------  ---------  ---------
                                         ---------  ---------  ---------  ---------  ---------
</TABLE>
    
 
    The reconciliation of income tax computed at the United States federal
statutory tax rate to the effective income tax rate is as follows:
 
   
<TABLE>
<CAPTION>
                                                                                        NINE MONTHS ENDED JULY
                                                       YEAR ENDED OCTOBER 31,                    31,
                                                -------------------------------------  ------------------------
                                                   1995         1996         1997         1997         1998
                                                -----------  -----------  -----------  -----------  -----------
                                                                                             (UNAUDITED)
<S>                                             <C>          <C>          <C>          <C>          <C>
Statutory federal income tax rate.............       35.0%        35.0%        35.0%        35.0%        35.0%
State income taxes............................        1.8          2.4          1.2          1.3          2.0
Goodwill and other............................        0.3          0.4          0.6          0.7          2.2
                                                      ---          ---          ---          ---          ---
  Effective tax rate..........................       37.1%        37.8%        36.8%        37.0%        39.2%
                                                      ---          ---          ---          ---          ---
                                                      ---          ---          ---          ---          ---
</TABLE>
    
 
                                      F-12
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(5) INCOME TAXES (CONTINUED)
    Significant components of the Company's deferred tax liabilities and assets
are as follows (in thousands):
 
   
<TABLE>
<CAPTION>
                                                                1996       1997
                                                              ---------  ---------  NINE MONTHS
                                                                                     ENDED JULY
                                                                                      31, 1998
                                                                                    ------------
                                                                                    (UNAUDITED)
<S>                                                           <C>        <C>        <C>
Deferred tax assets
  Capitalized overhead in inventory.........................  $   1,211  $   1,632   $    1,544
  Bad debt reserve..........................................        603        527        1,049
  Accrued reserves..........................................        637        595        2,246
  Other.....................................................        573        709        1,344
                                                              ---------  ---------  ------------
Total deferred tax assets...................................      3,024      3,463        6,183
                                                              ---------  ---------  ------------
Deferred tax liabilities
  Depreciation and amortization.............................      1,427      1,675       15,950
  Other.....................................................        442        951          981
                                                              ---------  ---------  ------------
Total deferred tax liabilities..............................      1,869      2,626       16,931
                                                              ---------  ---------  ------------
Net deferred tax asset (liability)..........................  $   1,155  $     837   $  (10,748)
                                                              ---------  ---------  ------------
                                                              ---------  ---------  ------------
</TABLE>
    
 
(6) OPERATING LEASE COMMITMENTS
 
   
    Total rental expense incurred from operating leases for the nine months
ended July 31, 1998 and the years ended October 31, 1995, 1996 and 1997 was
$4,631,000, $2,639,000, $3,990,000 and $4,644,000 respectively.
    
 
    Aggregate minimum required annual payments on long-term operating leases at
October 31, 1996 were as follows (in thousands):
 
<TABLE>
<CAPTION>
YEAR ENDED OCTOBER 31,
- ----------------------------------------------------------------------------------
<S>                                                                                 <C>
1998..............................................................................   $   2,573
1999..............................................................................       1,806
2000..............................................................................         914
2001..............................................................................         508
2002..............................................................................         252
                                                                                    -----------
                                                                                     $   6,053
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
(7) STOCK OPTIONS
 
   
    The Board of Directors has approved a non-statutory employee stock option
plan. This plan includes the future granting of stock options to purchase up to
4,100,000 shares as an incentive and reward for key management personnel.
Options expire ten years from date of grant. The right to acquire the option
shares
    
 
                                      F-13
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(7) STOCK OPTIONS (CONTINUED)
is earned in 25% increments over the first four years of the option period.
Stock option transactions during 1995, 1996 and 1997 are as follows (in
thousands):
 
<TABLE>
<CAPTION>
                                                                                     WEIGHTED
                                                                                      AVERAGE
                                                                       NUMBER OF     EXERCISE
                                                                        SHARES         PRICE
                                                                      -----------  -------------
<S>                                                                   <C>          <C>
Balance, October 31, 1994...........................................       1,393     $    2.73
  Granted...........................................................         159          8.64
  Canceled..........................................................           0             0
  Exercised.........................................................         (28)        (2.51)
                                                                           -----   -------------
Balance, October 31, 1995...........................................       1,524     $    3.35
  Granted...........................................................         630         12.75
  Canceled..........................................................         (46)        (9.82)
  Exercised.........................................................        (492)        (1.52)
                                                                           -----   -------------
Balance, October 31, 1996...........................................       1,616     $    7.39
  Granted...........................................................         314         15.23
  Canceled..........................................................         (10)       (12.09)
  Exercised.........................................................        (211)        (6.34)
                                                                           -----   -------------
Balance, October 31, 1997...........................................       1,709     $    8.93
                                                                           -----   -------------
                                                                           -----   -------------
</TABLE>
 
   
    Options exercisable at October 31, 1995, 1996, and 1997 were 1,095,000,
783,000, and 841,000, respectively. The weighted average exercise prices for
options exercisable at October 31, 1995, 1996 and 1997 were $1.88, $3.00 and
$4.60, respectively. Exercise prices for options outstanding at October 31, 1997
range from $.80 to $18.62. The weighted average remaining contractual life of
options outstanding at October 31, 1997 is 6.3 years.
    
 
    In accordance with the terms of APB No. 25, because the exercise price of
the Company's employee stock options equals the market price of the underlying
stock on the date of the grant, the Company records no compensation expense for
its stock option awards. As required by SFAS No. 123, the Company provides the
following disclosure of hypothetical values for these awards. The weighted
average grant-date fair value of options granted during 1996 was $6.05 and
during 1997 was $7.33. These values were estimated using the Black-Scholes
option-pricing model with the following weighted average assumptions: expected
dividend of 0%, expected volatility of 32.7%, risk free interest rates ranging
from 5.5% to 6.7% for 1996 and from 6.4% to 6.9% for 1997, and expected lives of
7 years. Had compensation expense been recorded based on these hypothetical
values, the Company's 1997 net income would have been $27.1 million or $1.59 per
share. A similar computation for 1996 would have resulted in net income of $24.4
million, or $1.48 per share. Because options vest over several years and
additional options grants are expected, the effects of these hypothetical
calculations are not likely to be representative of similar future calculations.
 
(8) LITIGATION
 
    The Company is involved in certain litigation that the Company considers to
be in the normal course of business. Management of the Company believes that
such litigation will not result in any material losses.
 
                                      F-14
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(9) NET INCOME PER SHARE
 
    In 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 128, EARNINGS PER SHARE, which requires the
presentation of basic and diluted earnings per share. Under the new statement,
the dilutive effect of stock options is excluded from basic earnings per share,
but included in the computation of diluted earnings per share. The new statement
is effective for periods ending after December 15, 1997. The Company adopted the
new statement during the first quarter of fiscal year 1998. Earnings per share
amounts for all periods presented have been restated. The computations are as
follows (in thousands, except per share data):
 
   
<TABLE>
<CAPTION>
                                                                                    NINE MONTHS ENDED
                                                      YEAR ENDED OCTOBER 31,          JULY 31, 1998
                                                  -------------------------------  --------------------
                                                    1995       1996       1997       1997       1998
                                                  ---------  ---------  ---------  ---------  ---------
                                                                                       (UNAUDITED)
<S>                                               <C>        <C>        <C>        <C>        <C>
Net income......................................  $  17,032  $  24,814  $  27,887  $  18,305  $  23,546
Add: Interest, net of tax, on convertible
  debenture assumed converted...................     --             38         66         50         50
                                                  ---------  ---------  ---------  ---------  ---------
Adjusted net income.............................  $  17,032  $  24,852  $  27,953  $  18,355  $  23,596
                                                  ---------  ---------  ---------  ---------  ---------
                                                  ---------  ---------  ---------  ---------  ---------
Weighted average common shares outstanding......     12,545     15,499     16,127     16,091     16,930
Add: Common stock equivalents
  Stock option plan.............................        985        898        858        851        935
  Convertible debenture.........................     --             58        100        100        100
                                                  ---------  ---------  ---------  ---------  ---------
Weighted average common shares outstanding,
  assuming dilution.............................     13,530     16,455     17,085     17,042     17,965
                                                  ---------  ---------  ---------  ---------  ---------
                                                  ---------  ---------  ---------  ---------  ---------
Net income per share--basic.....................  $    1.36  $    1.60  $    1.73  $    1.14  $    1.39
                                                  ---------  ---------  ---------  ---------  ---------
                                                  ---------  ---------  ---------  ---------  ---------
Net income per share--diluted...................  $    1.26  $    1.51  $    1.64  $    1.08  $    1.31
                                                  ---------  ---------  ---------  ---------  ---------
                                                  ---------  ---------  ---------  ---------  ---------
</TABLE>
    
 
(10) EMPLOYEE BENEFIT PLAN
 
   
    The Company has a 401(k) profit sharing plan (the "Savings Plan") which
covers all eligible employees. The Savings Plan requires the Company to match
employee contributions up to a certain percentage of a participant's salary. No
other contributions may be made to the Savings Plan. Contributions accrued for
the Savings Plan for the years ended October 31, 1995, 1996 and 1997 were
$775,000, $1,155,000 and $1,604,000 respectively.
    
 
(11) ACQUISITIONS
 
    In November 1995, the Company acquired substantially all of the assets and
assumed certain liabilities of Doors and Building Components, Inc. ("DBCI"), a
manufacturer of roll-up steel overhead doors used primarily in self-storage and
commercial/industrial applications, for approximately $12 million in cash and
300,000 shares of common stock of the Company, valued at $5.2 million. Based on
the final determination of book value of the purchased assets, the price was
reduced by approximately $2.5 million of which $1.5 million is due from the
seller and was recorded as a receivable in the October 31, 1996 balance sheet.
This amount was settled in cash in December, 1996. The excess of cost over fair
value of the acquired net assets recorded was $11.4 million.
 
                                      F-15
<PAGE>
                           NCI BUILDING SYSTEMS, INC.
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
   
 (INFORMATION PRESENTED FOR THE NINE MONTH PERIODS ENDED JULY 31, 1997 AND 1998
                                 IS UNAUDITED)
    
 
(11) ACQUISITIONS (CONTINUED)
    In April, 1996, the Company acquired substantially all of the assets and
assumed certain liabilities of Mesco Metal Buildings, a division of Anderson
Industries, Inc. ("Mesco"), a manufacturer of metal building systems and
components, for approximately $20.8 million in cash and a $1.5 million 7%
convertible subordinated debenture due April, 2001. The excess of cost over fair
value of the acquired net assets recorded was $10.9 million.
 
    Accordingly, the consolidated results of operations include DBCI and Mesco
since the date of acquisition. Both acquisitions were accounted for using the
purchase method. Assuming the acquisition of DBCI and Mesco had been consummated
as of November 1, 1995, the pro forma unaudited results of operations for the
year ended October 31, 1996 are as follows (in millions, except per share data):
 
<TABLE>
<S>                                                                    <C>
Sales................................................................  $     347
Net income...........................................................         26
Net income per share.................................................  $    1.60
</TABLE>
 
   
(12) SUBSEQUENT EVENTS (UNAUDITED)
    
 
   
    On May 4, 1998, the Company acquired Metal Buildings Components, Inc.
("MBCI") through the purchase of all of the outstanding capital stock of Amatek
Holdings, Inc. from BTR Australia Limited, a wholly owned subsidiary of BTR plc,
for a purchase price of approximately $600 million including cash of $550
million (plus transaction costs) and 1.4 million shares of the Company's common
stock valued at $32.2 million. MBCI designs, manufactures, sells and distributes
metal components for commercial, industrial, architectural, agricultural and
residential construction uses. MBCI also processes its own hot roll coil metal
for use in component manufacturing, as well as processing hot roll coil metal
and toll coating light gauge metal for use by other parties in the construction
of metal building components and numerous other products. The funds for this
acquisition were provided from the proceeds of a new $600 million credit
facility from several banks under which the Company initially borrowed $540
million. The facility includes a $200 million five-year term loan, a $200
million five-year revolving loan and a $200 million 364-day revolving loan which
is convertible into a three-year term loan under certain conditions. The
acquisition was accounted for using the purchase method of accounting. The
excess of cost over the fair value of the acquired assets was approximately $393
million.
    
 
   
    The consolidated results of operations for 1998 include MBCI since the date
of acquisition. Assuming the acquisition of MBCI had been consummated November
1, 1997, the pro forma unaudited results of operations are as follows (in
millions, except per share data):
    
 
   
<TABLE>
<CAPTION>
                                                         TWELVE MONTHS    NINE MONTHS
                                                         ENDED OCTOBER    ENDED JULY
                                                           31, 1997        31, 1998
                                                        ---------------  -------------
<S>                                                     <C>              <C>
Sales.................................................     $     816       $     618
Net income............................................     $      31       $      23
Net income per share - basic..........................     $    1.79       $    1.27
Net income per share - diluted........................     $    1.70       $    1.20
</TABLE>
    
 
                                      F-16
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
Stockholder
Amatek Holdings, Inc.
 
    We have audited the accompanying consolidated balance sheets of Amatek
Holdings, Inc. and subsidiaries (the "Company"), as of December 31, 1997, and
1996, and the related consolidated statements of operations, cash flows, and
stockholder's equity for each of the three years in the period ended December
31, 1997. These financial statements are the responsibility of the Company'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 consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Amatek
Holdings, Inc. and subsidiaries as of December 31, 1997 and 1996, and the
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1997, in conformity with generally accepted
accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
 
                                          ERNST & YOUNG LLP
 
Houston, Texas
August 5, 1998
 
                                      F-17
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                   DECEMBER 31
                                                                              ----------------------
                                                                                 1996        1997
                                                                              ----------  ----------   MARCH 31,
                                                                                                         1998
                                                                                                      -----------
                                                                                                      (UNAUDITED)
<S>                                                                           <C>         <C>         <C>
                                                     ASSETS
 
Current assets:
  Cash and cash equivalents.................................................  $    3,622  $    7,012   $   1,345
  Accounts receivable:
    Trade, net of allowance for doubtful accounts of $576, $658, and $395...      41,942      44,599      43,162
    Other...................................................................       2,835       6,659       3,737
  Inventories...............................................................      32,410      43,479      47,516
  Prepaid expenses..........................................................       2,004       2,715       3,419
  Income taxes receivable...................................................      --             437      --
  Deferred tax asset........................................................         853       1,186       1,186
                                                                              ----------  ----------  -----------
Total current assets........................................................      83,666     106,087     100,365
 
Property, plant, and equipment:
  Land......................................................................       4,390       5,916       6,227
  Buildings and improvements................................................      31,104      40,845      41,425
  Machinery and equipment...................................................      72,381      88,354      90,283
  Construction-in-progress..................................................      11,659       8,272       7,116
                                                                              ----------  ----------  -----------
                                                                                 119,534     143,387     145,051
  Less accumulated depreciation.............................................     (34,813)    (39,252)    (41,088)
                                                                              ----------  ----------  -----------
                                                                                  84,721     104,135     103,963
Receivable from affiliate...................................................      19,261       1,364      --
Investments in and advances to DOUBLECOTE...................................      19,031      19,200      19,415
Intangible assets...........................................................      13,822      13,652      13,612
Other assets................................................................      --           5,325       5,871
                                                                              ----------  ----------  -----------
Total assets................................................................  $  220,501  $  249,763   $ 243,226
                                                                              ----------  ----------  -----------
                                                                              ----------  ----------  -----------
 
                                      LIABILITIES AND STOCKHOLDER'S EQUITY
 
Current liabilities:
  Accounts payable..........................................................  $   32,638  $   18,174   $   9,288
  Accrued liabilities.......................................................      13,495      15,659      11,526
  Income taxes payable......................................................       2,544      --           3,426
                                                                              ----------  ----------  -----------
      Total current liabilities.............................................      48,677      33,833      24,240
Deferred tax liability......................................................       6,776      11,142      10,588
Stockholder's equity:
  Common stock--par value $-0-; 119,500, 3,500, 3,500 shares issued and
    outstanding at March 31, 1998, December 31, 1997, and December 31,
    1996....................................................................       2,600       2,600     182,172
  Additional paid-in capital................................................       4,380       4,380       4,380
  Retained earnings.........................................................     158,068     197,808      21,846
                                                                              ----------  ----------  -----------
Total stockholder's equity..................................................     165,048     204,788     208,398
                                                                              ----------  ----------  -----------
Total liabilities and stockholder's equity..................................  $  220,501  $  249,763   $ 243,226
                                                                              ----------  ----------  -----------
                                                                              ----------  ----------  -----------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-18
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                             THREE MONTHS ENDED
                                                           YEAR ENDED DECEMBER 31                 MARCH 31
                                                    -------------------------------------  ----------------------
                                                       1995         1996         1997         1997        1998
                                                    -----------  -----------  -----------  ----------  ----------
                                                                                                (UNAUDITED)
<S>                                                 <C>          <C>          <C>          <C>         <C>
Sales.............................................  $   315,737  $   362,867  $   407,967  $   82,505  $   84,172
Cost of sales.....................................     (234,042)    (271,299)    (312,329)    (63,896)    (68,864)
                                                    -----------  -----------  -----------  ----------  ----------
Gross profit......................................       81,695       91,568       95,638      18,609      15,308
Selling, general, and administrative
  expenses........................................      (24,900)     (29,652)     (36,637)     (8,543)     (9,598)
Equity in income (losses) of DOUBLECOTE...........       (1,293)        (304)          83        (170)       (161)
Interest income, net..............................        1,379        1,871        2,019         267         267
Unusual/nonrecurring gain.........................      --           --             3,284      --          --
                                                    -----------  -----------  -----------  ----------  ----------
Income before income taxes........................       56,881       63,483       64,387      10,163       5,816
Provision for income taxes........................      (22,993)     (24,920)     (24,647)     (4,096)     (2,206)
                                                    -----------  -----------  -----------  ----------  ----------
Net income........................................  $    33,888  $    38,563  $    39,740  $    6,067  $    3,610
                                                    -----------  -----------  -----------  ----------  ----------
                                                    -----------  -----------  -----------  ----------  ----------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-19
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                                       THREE MONTHS ENDED
                                                                       YEAR ENDED DECEMBER 31               MARCH 31
                                                                 ----------------------------------  ----------------------
                                                                    1995        1996        1997        1997        1998
                                                                 ----------  ----------  ----------  ----------  ----------
                                                                                                          (UNAUDITED)
<S>                                                              <C>         <C>         <C>         <C>         <C>
OPERATING ACTIVITIES
Net income.....................................................  $   33,888  $   38,563  $   39,740  $    6,067  $    3,610
Adjustments to reconcile net income to net cash (used in)
  provided by operating activities:
  Depreciation and amortization................................       4,136       5,477       6,844       1,639       2,019
  Provision for deferred income taxes..........................          82         716       4,033       1,866        (554)
  Provision for losses on accounts receivable..................          71        (266)        262       1,867         (82)
  Changes in operating assets and liabilities:
    Increase in accounts receivable--trade.....................      (1,980)     (5,517)     (2,919)        924       1,519
    Increase in other accounts receivable......................         134      (2,326)     (3,824)     (1,357)      2,922
    Increase in inventories....................................       5,383      (6,744)    (11,069)        102      (4,037)
    Increase in prepaid expenses...............................        (123)     (1,163)       (711)        208        (704)
    (Increase) decrease in other assets........................        (432)      1,018      (5,962)         84        (546)
    (Decrease) increase in accounts payable and accrued
      liabilities..............................................       2,307      13,169     (12,300)    (18,808)    (13,019)
    (Decrease) increase in income taxes payable................      (1,438)      1,239      (2,544)      1,053       3,426
                                                                 ----------  ----------  ----------  ----------  ----------
Net cash (used in) provided by operating activities............      42,028      44,166      11,550      (6,355)     (5,446)
INVESTING ACTIVITIES
Purchase of property, plant, and equipment.....................     (12,501)    (21,146)    (27,166)     (5,847)     (1,646)
Proceeds from sale of property, plant, and equipment...........          32          73       1,632      --          --
Advances to and investments in DOUBLECOTE......................      (2,835)     (2,000)        (86)       (369)       (376)
Cash paid for acquired business................................      --         (21,221)     --          --          --
                                                                 ----------  ----------  ----------  ----------  ----------
Net cash used in investing activities..........................     (15,304)    (44,294)    (25,620)     (6,216)     (2,022)
FINANCING ACTIVITIES
Net borrowings under credit facilities.........................      (4,754)     --          --          --          --
Proceeds to related party......................................     (21,471)      1,080      17,460      13,549       1,801
                                                                 ----------  ----------  ----------  ----------  ----------
Net cash provided by (used in) financing activities............     (26,225)      1,080      17,460      13,549       1,801
                                                                 ----------  ----------  ----------  ----------  ----------
Net (decrease) increase in cash and cash equivalents...........         499         952       3,390         978      (5,667)
Cash and cash equivalents at beginning of year.................       2,171       2,670       3,622       3,622       7,012
                                                                 ----------  ----------  ----------  ----------  ----------
Cash and cash equivalents at end of year.......................  $    2,670  $    3,622  $    7,012  $    4,600  $    1,345
                                                                 ----------  ----------  ----------  ----------  ----------
                                                                 ----------  ----------  ----------  ----------  ----------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-20
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                             ADDITIONAL
                                                                   COMMON      PAID-IN     RETAINED
                                                                   STOCK       CAPITAL     EARNINGS       TOTAL
                                                                 ----------  -----------  -----------  -----------
<S>                                                              <C>         <C>          <C>          <C>
Balance at December 31, 1994...................................  $    2,600   $   4,380   $    85,617  $    92,597
  Net income...................................................      --          --            33,888       33,888
                                                                 ----------  -----------  -----------  -----------
Balance at December 31, 1995...................................       2,600       4,380       119,505      126,485
  Net income...................................................      --          --            38,563       38,563
                                                                 ----------  -----------  -----------  -----------
Balance at December 31, 1996...................................       2,600       4,380       158,068      165,048
  Net income...................................................      --          --            39,740       39,740
                                                                 ----------  -----------  -----------  -----------
Balance at December 31, 1997...................................       2,600       4,380       197,808      204,788
  Net income...................................................      --          --             3,610        3,610
Dividend to Parent.............................................      --          --          (179,572)    (179,572)
Capital contribution from Parent...............................     179,572      --           --           179,572
                                                                 ----------  -----------  -----------  -----------
Balance at March 31, 1998 (UNAUDITED)..........................  $  182,172   $   4,380   $    21,846  $   208,398
                                                                 ----------  -----------  -----------  -----------
                                                                 ----------  -----------  -----------  -----------
</TABLE>
    
 
                            See accompanying notes.
 
                                      F-21
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. OWNERSHIP AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    All outstanding common stock of Amatek Holdings, Inc. ("AHI"), is owned by
Amatek Limited (the "Parent," which is an Australian company), a wholly owned
subsidiary of BTR Nylex (an Australian company), which is ultimately owned by
BTR plc (a British company). AHI is a manufacturer of steel roofing and siding
products. Principal markets are in the continental United States.
 
    The consolidated financial statements include the accounts of AHI and all
majority-owned subsidiaries (the "Company"). The Company's investment in
DOUBLECOTE, L.L.C. ("DOUBLECOTE"), is accounted for using the equity method (see
Note 9). All significant intercompany balances and transactions have been
eliminated in consolidation.
 
    CASH AND CASH EQUIVALENTS
 
    Cash and cash equivalents consist of all cash balances and highly liquid
investments which have a maturity of three months or less when acquired.
 
    INVENTORY
 
    Inventories are valued at the lower of cost or market, determined on the
first-in, first-out method.
 
    PROPERTY, PLANT, AND EQUIPMENT
 
    Property, plant, and equipment are stated at cost. The cost of repairs and
maintenance is charged to operations as incurred. Depreciation of property,
plant, and equipment is provided on a straight-line basis over the estimated
useful lives of the assets as follows:
 
<TABLE>
<S>                                                             <C>
Building and improvements.....................................  40 years
                                                                4 to 13
Machinery and equipment.......................................  years
                                                                3 to 10
Computer and office equipment.................................  years
</TABLE>
 
    Effective January 1, 1996, the Company adopted Statement of Financial
Accounting Standards ("SFAS") No. 121, ACCOUNTING FOR THE IMPAIRMENT OF
LONG-LIVED ASSETS AND FOR LONG-LIVED ASSETS TO BE DISPOSED OF. This statement
generally requires a periodic review of long-lived assets for indications that
their carrying amounts may not be recoverable, and governs the measurement and
disclosure of any resulting impairment loss. Its application did not have a
material impact on the Company's financial position or results of operations.
 
    INCOME TAXES
 
    The Company uses SFAS No. 109, ACCOUNTING FOR INCOME TAXES, in accounting
for income taxes. This statement requires an asset and liability approach for
financial accounting and reporting of income taxes.
 
    INTANGIBLE ASSETS
 
   
    Goodwill of $15,479,000, $15,333,000, and $14,777,000, which relates to the
acquisition of certain assets and other stockholder interest at March 31, 1998
and December 31, 1997 and 1996, respectively, is being amortized on a
straight-line basis over 20 years. Accumulated amortization of goodwill was
$1,867,000, $1,681,000, and $955,000 as of March 31, 1998 and December 31, 1997
and 1996, respectively.
    
 
                                      F-22
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
1. OWNERSHIP AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The carrying amount of the Company's financial instruments (cash, accounts
receivable, and accounts payable) approximates fair value.
 
    MANAGEMENT ESTIMATES
 
    The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires the Company to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
    RECLASSIFICATIONS
 
    Certain reclassifications have been made to 1996 financial information in
order to conform to 1997 presentation.
 
    In the opinion of management, the unaudited consolidated financial
statements include all adjustments, consisting solely of normal recurring
adjustments, necessary for a fair presentation of the financial position as of
March 31, 1998, and the results of operations and cash flows for each of the
three-month periods ended March 31, 1998 and 1997. Although management believes
the disclosures in these financial statements are adequate to make the
information presented not misleading, certain information and footnote
disclosures normally included in annual audited financial statements prepared in
accordance with generally accepted accounting principals have been condensed or
omitted pursuant to the rules and regulations of the Securities and Exchange
Commission. The results of operations and the cash flows for the three-month
period ended March 31, 1998 are not necessarily indicative of the results to be
expected for the full year.
 
2. INVENTORIES
 
    The components of inventories were as follows (in thousands):
 
   
<TABLE>
<CAPTION>
                                                                 DECEMBER 31
                                                             --------------------
                                                               1996       1997
                                                             ---------  ---------   MARCH 31
                                                                                      1998
                                                                                   -----------
                                                                                   (UNAUDITED)
<S>                                                          <C>        <C>        <C>
Raw materials..............................................  $  22,581  $  34,638   $  35,247
Finished goods.............................................      9,829      8,841      12,269
                                                             ---------  ---------  -----------
Total......................................................  $  32,410  $  43,479   $  47,516
                                                             ---------  ---------  -----------
                                                             ---------  ---------  -----------
</TABLE>
    
 
3. NOTES PAYABLE TO BANK
 
    The Company had an overdraft line of credit facility for $10 million which
terminated on March 31, 1998. There were no advances outstanding at March 31,
1998 and December 31, 1997 and 1996.
 
                                      F-23
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
4. RELATED PARTY TRANSACTIONS
 
    The Company periodically advances funds to its Parent and charges the Parent
interest at a rate which approximates prime for net advances. In addition, the
Company remits its federal income taxes payable to the Parent (see Notes 5 and
7). Based on intercompany lending rates for advances and payables with similar
terms, the fair value of these advances approximates their carrying values.
 
5. FEDERAL INCOME TAX
 
    The provisions for federal income taxes are composed of the following (in
thousands):
 
   
<TABLE>
<CAPTION>
                                                                         DECEMBER 31                  MARCH 31
                                                               -------------------------------  --------------------
                                                                 1995       1996       1997       1997       1998
                                                               ---------  ---------  ---------  ---------  ---------
                                                                                                    (UNAUDITED)
<S>                                                            <C>        <C>        <C>        <C>        <C>
Current income taxes.........................................  $  22,917  $  24,203  $  20,612  $   2,229  $   2,761
Deferred income taxes........................................         76        717      4,035      1,867       (555)
                                                               ---------  ---------  ---------  ---------  ---------
Total........................................................  $  22,993  $  24,920  $  24,647  $   4,096  $   2,206
                                                               ---------  ---------  ---------  ---------  ---------
                                                               ---------  ---------  ---------  ---------  ---------
</TABLE>
    
 
    The effective income tax rate of the Company approximates the sum of the
statutory federal income tax rate and certain state income tax rates less
related federal tax benefit.
 
    Significant components of the Company's deferred tax assets and liabilities
were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                    DECEMBER 31                              MARCH 31
                                                 --------------------------------------------------  ------------------------
                                                           1996                      1997                      1998
                                                 ------------------------  ------------------------  ------------------------
                                                   CURRENT     LONG-TERM     CURRENT     LONG-TERM     CURRENT     LONG-TERM
                                                 -----------  -----------  -----------  -----------  -----------  -----------
                                                                                                           (UNAUDITED)
<S>                                              <C>          <C>          <C>          <C>          <C>          <C>
Property.......................................   $  --        $  (9,442)   $  --        $ (14,069)   $  --        $ (14,368)
Insurance reserves.............................         461       --              782       --              782       --
Bad debt reserve...............................         147       --              248       --              248       --
Inventory......................................         245       --              183       --              183       --
Deferred compensation and incentive
  plan.........................................      --            2,660       --            2,931       --            3,780
Other..........................................      --               11          (27)      --              (27)
                                                      -----   -----------  -----------  -----------  -----------  -----------
Total..........................................   $     853    $  (6,771)   $   1,186    $ (11,138)   $   1,186    $ (10,588)
                                                      -----   -----------  -----------  -----------  -----------  -----------
                                                      -----   -----------  -----------  -----------  -----------  -----------
Total deferred tax assets......................                $   3,524                 $   4,346                 $   4,993
Total deferred tax liabilities.................                   (9,442)                  (14,298)                  (14,395)
                                                              -----------               -----------               -----------
Net deferred tax liability.....................                $  (5,918)                $  (9,952)                $  (9,402)
                                                              -----------               -----------               -----------
                                                              -----------               -----------               -----------
</TABLE>
 
6. LEASES
 
   
    The Company leases certain equipment (primarily vehicles) and operating
facilities under operating leases expiring at various dates through 2000. Total
rental expense under operating leases was $1,514,000, $1,291,000, and $1,096,000
in 1997, 1996, and 1995, respectively.
    
 
                                      F-24
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
6. LEASES (CONTINUED)
    Aggregate minimum lease payments under operating leases are as follows (in
thousands):
 
<TABLE>
<S>                                                                   <C>
1998................................................................  $     508
1999................................................................        567
2000................................................................        391
2001................................................................         72
                                                                      ---------
                                                                      $   1,538
                                                                      ---------
                                                                      ---------
</TABLE>
 
7. SUPPLEMENTAL CASH FLOW DISCLOSURES
 
   
    Cash paid for interest during the years ended December 31, 1997, 1996, and
1995 was $81,000, $80,000, and $131,000, respectively. Cash paid for income
taxes during the years ended December 31, 1997, 1996, and 1995 was $24,349,000,
$21,402,000, and $23,639,000, respectively.
    
 
8. EMPLOYEE BENEFIT PLANS
 
   
    The Company sponsors a 401(k) savings plan for its full-time employees. The
Company matches 100% of employee-elected pre-tax contributions to a maximum of
4% of their salaries. The Company's contributions were $1,132,000, $943,000, and
$830,000 in 1997, 1996, and 1995, respectively.
    
 
   
    An Incentive Compensation Plan (the "Plan") was established in 1992, in part
because of the purchase of the minority interest of a partnership of which
certain officers of the Company were limited partners. Under the terms of the
Plan, an annual contribution is determined based upon the Company's earnings and
revenues. Annual contributions are placed in trust (with the trustee,
NationsBank) and vest to participants over a seven- to ten-year period. In the
event that a participant voluntarily leaves the Company or is terminated for
"good cause," the unvested portion of contributions to the Plan is forfeited to
the Company. The contributions were $4,302,000, $3,714,000, and $2,766,000 for
1997, 1996, and 1995, respectively.
    
 
9. INVESTMENT IN DOUBLECOTE
 
    The Company, through a subsidiary, owns 50% of the common stock in
DOUBLECOTE, a corporate joint venture.
 
                                      F-25
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
9. INVESTMENT IN DOUBLECOTE (CONTINUED)
 
    Summarized financial information of DOUBLECOTE is as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                                    DECEMBER 31
                                                                               ----------------------
                                                                                  1996        1997
                                                                               ----------  ----------   MARCH 31
                                                                                                          1998
                                                                                                       -----------
                                                                                                       (UNAUDITED)
<S>                                                                            <C>         <C>         <C>
Current assets...............................................................  $    7,266  $    8,165   $   9,210
Noncurrent assets............................................................      30,524      28,601      28,102
                                                                               ----------  ----------  -----------
Total assets.................................................................  $   37,790  $   36,766   $  37,312
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
Liabilities--advances from stockholder.......................................  $   36,232  $   36,404   $  37,157
Other liabilities............................................................       2,753       1,390       1,505
Stockholder's equity:
  Contributed capital........................................................       2,000       2,000       2,000
  Accumulated deficit........................................................      (3,195)     (3,028)     (3,350)
                                                                               ----------  ----------  -----------
Total liabilities and stockholder's equity...................................  $   37,790  $   36,766   $  37,312
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
Sales........................................................................  $   28,034  $   30,348   $   6,427
Cost of sales................................................................     (24,682)    (26,150)     (5,722)
                                                                               ----------  ----------  -----------
Gross profit.................................................................       3,352       4,198         705
Selling, general, and administrative expenses................................        (964)     (1,080)       (303)
Interest expense.............................................................      (2,997)     (2,952)       (724)
                                                                               ----------  ----------  -----------
Net income (loss)............................................................  $     (609) $      166   $    (322)
                                                                               ----------  ----------  -----------
                                                                               ----------  ----------  -----------
</TABLE>
 
    The facility owned by DOUBLECOTE was completed and began operations in 1995.
 
   
    DOUBLECOTE is charged interest at prime for advances by the Company. Total
interest income earned by the Company was $1,500,000 in 1997 and 1996 and
$1,465,000 in 1995.
    
 
10. LUBBOCK PLANT FIRE
 
    In February 1997, the Company's Lubbock, Texas, plant sustained major damage
from a fire. The Company has since rebuilt the plant, and resumed operations in
July 1997.
 
    The Company maintains insurance under one policy for both property damage
and business interruption applicable to its production facilities. The policy
provides coverage subject to a $25,000 deductible. Insurance recoveries as of
December 31, 1997 included $1.5 million for property damage and $500,000 for
business interruption. The Company is pursuing additional recoveries of $4
million related to the damage of the Lubbock plant.
 
    Insurance recoveries for property damage associated with events of this type
require the recognition of a new cost basis for the rebuilt facility. As a
result, the Company has recognized a $3.3 million unusual/ nonrecurring
adjustment in its income statement for the year ended December 31, 1997. Total
spending to restore the Lubbock plant was approximately $4.8 million.
 
                                      F-26
<PAGE>
                     AMATEK HOLDINGS, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
11. ACQUISITION OF BUSINESS
 
   
    On April 1, 1996, the Company purchased certain assets of Steelco Metal
Construction Products and Construction Metals ("Steelco") for a total cost of
approximately $21,221,000. Steelco was engaged in the manufacturing of steel
roofing and siding products. The acquisition was accounted for as a purchase.
The excess of the purchase price over the fair values of the net assets acquired
of $11,266,000 has been recorded as goodwill and is being amortized over a
period of 20 years. The statement of operations for 1996 includes the operating
results of Steelco since the date of acquisition.
    
 
12. YEAR 2000 (UNAUDITED)
 
    The Company has conducted a comprehensive review of its computer systems to
identify the systems that could be affected by the "Year 2000" issue and is
implementing its plan to resolve the issue. The Year 2000 problem is a result of
computer programs being written using two digits (rather than four) to define
the applicable year. Any of the Company's programs that have time-sensitive
software may recognize a date using "00" as the year 1900 rather than the year
2000. This could result in major system failure or miscalculation. The Company
presently believes that, with modifications to existing software and converting
to new software, the Year 2000 problem will not pose significant operational
problems for the Company's computer systems as so modified and converted.
However, if such modifications or conversions are not made, or not completed
timely, the Year 2000 issue could have a material impact on the Company's
operations.
 
13. COMMITMENTS AND CONTINGENCIES
 
    In March 1998, the Company entered into an agreement with NCI Building
Systems, Inc. to purchase 100% of the stock of the Company, which was effective
May 4, 1998. Upon the successful completion of this acquisition, certain
executives of the Company will receive compensation payments totaling
approximately $8.5 million.
 
                                      F-27
<PAGE>
                                   [Graphics]
 
    The inside back cover of the Prospectus includes a map of the United States
on the upper half of the page with symbols placed on the map to represent the
Company's manufacturing facilities and various of the Company's trademarks on
the lower half of the page.
<PAGE>
No dealer, salesperson or other individual has been authorized to give any
information or to make any representation other than those contained in this
Prospectus in connection with the offer contained herein, and, if given or made,
such information or representation must not be relied upon as having been
authorized by the Company, the Selling Stockholders or any Underwriter. This
Prospectus does not constitute an offer to sell, or a solicitation of an offer
to buy, shares of Common Stock in any jurisdiction to any person to whom it is
not lawful to make such offer or solicitation in such jurisdiction or in which
the person making such offer or solicitation is not qualified to do so. Neither
the delivery of this Prospectus nor any sale made hereunder shall, under any
circumstances, create an implication that there has been no change in the
affairs of the Company since the date hereof.
 
                               TABLE OF CONTENTS
- ------------------------------------------------
 
   
<TABLE>
<S>                                                                         <C>
Prospectus Summary........................................................     3
Risk Factors..............................................................     9
The MBCI Acquisition......................................................    14
Use of Proceeds...........................................................    14
Capitalization............................................................    15
Price Range of Common Stock...............................................    16
Dividend Policy...........................................................    16
Unaudited Pro Forma Condensed Combined Financial Statements...............    17
Selected Historical Consolidated Financial Information....................    23
Management's Discussion and Analysis of Financial Condition and Results of
  Operations..............................................................    25
Industry Overview.........................................................    34
Business..................................................................    36
Management................................................................    48
Certain Relationships and Related Transactions............................    51
Principal and Selling Stockholders........................................    52
Underwriting..............................................................    54
Legal Matters.............................................................    55
Experts...................................................................    55
Available Information.....................................................    55
Incorporation of Certain Documents by Reference...........................    56
Index to Financial Statements.............................................   F-1
</TABLE>
    
 
PROSPECTUS                                                                , 1998
 
   
                                     [LOGO]
 
                                3,800,000 Shares
    
 
                                  Common Stock
                            WARBURG DILLON READ LLC
                              J.C. BRADFORD & CO.
                               WHEAT FIRST UNION
                             DAIN RAUSCHER WESSELS
 
                A DIVISION OF DAIN RAUSCHER INCORPORATED
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The Registrant estimates that expenses in connection with the offering
described in this Registration Statement will be as follows. All of the amounts
except the Commission registration fee and the Nasdaq additional listing fee are
estimates.
 
<TABLE>
<CAPTION>
ITEM                                                                                  AMOUNT
- ----------------------------------------------------------------------------------  ----------
<S>                                                                                 <C>
Commission registration fee.......................................................     28,845
National Association of Securities Dealers, Inc. filing fee.......................     10,267
Nasdaq additional listing fee.....................................................     17,500
Legal fees and expenses...........................................................    200,000
Accounting fees and expenses......................................................    150,000
Printing expenses.................................................................     75,000
Fees and expenses for qualification under state securities laws (including legal
  fees)...........................................................................      5,000
Transfer agent's fees and expenses................................................      2,500
Miscellaneous.....................................................................     10,888
                                                                                    ----------
    Total.........................................................................    500,000*
                                                                                    ----------
                                                                                    ----------
</TABLE>
 
- ------------------------
 
*   None of this amount is to be borne by the Selling Stockholders.
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    As permitted by the Delaware General Corporation Law, the Registrant's
Amended and Restated By-Laws provide that the directors and officers of the
Registrant shall be indemnified by the Registrant against certain liabilities
that those persons may incur in their capacities as directors or officers.
Furthermore, the Registrant's Restated Certificate of Incorporation eliminates
the liability of directors of the Registrant, under certain circumstances, to
the maximum extent permitted by the Delaware General Corporation Law.
 
    The Underwriting Agreement to be filed as Exhibit 1.1 hereto contains
reciprocal agreements of indemnity between the Registrant and the underwriters
as to certain liabilities, including liabilities under the Securities Act and in
certain circumstances provides for indemnification of the Registrant's directors
and officers.
 
ITEM 16. EXHIBITS.
 
   
<TABLE>
<C>    <S>
**1.1  Form of Underwriting Agreement
 
**4.1  Form of certificate representing shares of Registrant's common stock
 
 *4.2  Stock Registration Agreement dated April 10, 1989, between Registrant and
         Equus II Incorporated, formerly Equus II, L.P. (filed as Exhibit 4.2 to
         Registrant's Form S-1 registration statement no. 33-45612 and
         incorporated by reference herein)
 
 *4.3  Credit Agreement, dated March 25, 1998 (the "Credit Agreement"), by and
         among the Registrant, NationsBank, N.A. (as successor in interest to
         NationsBank of Texas, N.A.), as administrative agent ("NationsBank"),
         NationsBanc Montgomery Securities LLC, as arranger and syndication
         agent, Swiss Bank Corporation, as documentation agent ("Swiss Bank"),
         and the several lenders named therein
</TABLE>
    
 
                                      II-1
<PAGE>
<TABLE>
<C>    <S>
 *4.4  First Amendment to Credit Agreement, dated May 1, 1998, among the
         Registrant, NationsBank, Swiss Bank and the parties named therein
 
 *4.5  Second Amendment to Credit Agreement, dated May 5, 1998, among the
         Registrant, NationsBank, Swiss Bank and the parties named therein
 
 *4.6  Master Assignment and Acceptance, dated as of May 6, 1998, among
         NationsBank, Swiss Bank and the several lenders named therein
 
 *4.7  Facility A Notes (Revolving Credit), dated May 6, 1998, of the Registrant
         in favor of lenders named therein
 
 *4.8  Facility B Notes (Term Loan), dated May 6, 1998, of the Registrant in
         favor of lenders named therein
 
 *4.9  Facility C Notes (364-day Revolving Facility), dated May 6, 1998, of the
         Registrant in favor of lenders named therein
 
 *4.10 Guaranty, dated May 1, 1998, between NationsBank and A&S Business
         Interests, Inc.
 
 *4.11 Guaranty, dated May 1, 1998, between NationsBank and A&S Building Systems,
         L.P.
 
 *4.12 Guaranty, dated May 1, 1998, between NationsBank and NCI Building Systems,
         L.P.
 
 *4.13 Guaranty, dated May 1, 1998, between NationsBank and NCI Holding Corp.
 
 *4.14 Guaranty, dated May 1, 1998, between NationsBank and NCI Operating Corp.
 
 *4.15 Guaranty, dated May 1, 1998, between NationsBank and Metal Building
         Components Holding, Inc.
 
 *4.16 Guaranty, dated May 1, 1998, between NationsBank and Metal Coaters
         Holding, Inc.
 
 *4.17 Guaranty, dated May 1, 1998, between NationsBank and Metal Building
         Components, L.P. (formerly MBCI Operating, L.P.)
 
 *4.18 Guaranty, dated May 1, 1998, between NationsBank and Metal Coaters
         Operating, L.P.
 
 *4.19 Guaranty, dated May 13, 1998, between NationsBank and Metal Coaters of
         California, Inc.
 
 *4.20 Pledge Agreement, dated May 1, 1998, between the Registrant and
         NationsBank
 
 *4.21 Pledge Agreement, dated May 1, 1998, between NCI Holding Corp. and
         NationsBank
 
 *4.22 Pledge Agreement, dated May 13, 1998, between the Metal Coaters Holding,
         Inc. and NationsBank
 
 *4.23 Assignment of Partnership Interests, dated May 1, 1998, between NCI
         Operating Corp. and NationsBank
 
 *4.24 Assignment of Partnership Interests, dated May 1, 1998, between NCI
         Holding Corp. and NationsBank
 
 *4.25 Assignment of Partnership Interests, dated May 1, 1998, between Metal
         Building Components Holding, Inc. and NationsBank
 
 *4.26 Assignment of Partnership Interests, dated May 1, 1998, between Metal
         Coaters Holding, Inc. and NationsBank
 
 *4.27 Promissory Note, dated May 5, 1998, of NCI Holding Corp. in favor of the
         Registrant
 
 *4.28 Note Pledge Agreement, dated May 5, 1998, between the Registrant and
         NationsBank
</TABLE>
 
                                      II-2
<PAGE>
   
<TABLE>
<C>    <S>
 *4.29 Loan Agreement "A," dated September 1, 1991, between the City of Mattoon
         and the Company (filed as Exhibit 4.11 to the Registrant's registration
         statement no. 33-45612 and incorporated by reference herein)
 
 *4.30 $250,000 Promissory Note A, dated October 31, 1991, in favor of the City
         of Mattoon executed by the Company (filed as Exhibit 4.12 to the
         Registrant's registration statement no. 33-45612 and incorporated by
         reference herein)
 
 *4.31 Loan Agreement "B," dated September 1, 1991, between the City of Mattoon
         and the Company (filed as Exhibit 4.13 to the Registrant's registration
         statement no. 33-45612 and incorporated by reference herein)
 
 *4.32 $250,000 Promissory Note B, dated January 20, 1992, in favor of the City
         of Mattoon executed by the Company (filed as Exhibit 4.14 to the
         Registrant's registration statement no. 33-45612 and incorporated by
         reference herein)
 
 *4.33 Stock Retention and Registration Agreement, dated November 13, 1995, by
         and between the Company, Doors & Building Components, Inc., and David B.
         Curtis (filed as Exhibit 4.14 to the Registrant's Annual Report on Form
         10-K for the fiscal year ended October 31, 1995, and incorporated by
         reference herein)
 
 *4.34 7% Convertible Subordinated Debenture dated April 1, 1996, Due April 1,
         2001, between NCI Building Systems, Inc. and John T. Eubanks (filed as
         Exhibit 4.15 to the Registrant's Annual Report on Form 10-K for the
         fiscal year ended October 31, 1996, and incorporated by reference
         herein)
 
 *4.35 Rights Agreement, dated June 24, 1998, between the Registrant and Harris
         Trust and Savings Bank (filed as Exhibit 2 to the Registrant's
         registration statement on Form 8-A and incorporated by reference herein)
 
**5.1  Legal Opinion of Gardere & Wynne, L.L.P., regarding legality of securities
         being registered
 
**23.1 Consent of Ernst & Young LLP
 
**23.2 Consent of Gardere & Wynne, L.L.P. (included in Exhibit 5.1)
 
 *24.1 Power of Attorney (set forth on page II-5 of initial filing)
</TABLE>
    
 
- ------------------------
 
   
*   Previously filed.
    
 
   
**  Filed herewith.
    
 
ITEM 17. UNDERTAKINGS.
 
    (a) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefits plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement 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.
 
    (b) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. If a claim for indemnification against such liabilities (other
than the payment by the Registrant of expenses incurred or paid by a director,
officer or controlling person of the Registrant in the successful defense of any
action,
 
                                      II-3
<PAGE>
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
    (c) The undersigned Registrant hereby undertakes that:
 
        (1) For purposes of determining any liability under the Securities 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 Securities Act shall be deemed to be part of this
    Registration Statement as of the time it was declared effective.
 
        (2) For the purpose of determining any liability under the Securities
    Act, each post-effective amendment that contains a form of prospectus shall
    be deemed to be a new registration statement relating to the securities
    offered therein, and this offering of such securities at that time shall be
    deemed to be the initial bona fide offering thereof.
 
                                      II-4
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act, the Registrant certifies
that it has reasonable grounds to believe it meets all of the requirements for
filing on Form S-3 and has duly caused this Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of
Houston, State of Texas on the 2nd day of September, 1998.
    
 
   
<TABLE>
<S>                             <C>  <C>
                                NCI BUILDING SYSTEMS, INC.
 
                                By:            /s/ ROBERT J. MEDLOCK
                                     -----------------------------------------
                                                 Robert J. Medlock,
                                     VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
</TABLE>
    
 
   
    Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed below by the following persons and in the capacities
indicated on the 2nd day of September, 1998.
    
 
<TABLE>
<CAPTION>
             NAME                         TITLE
- ------------------------------  --------------------------
 
<C>                             <S>
                                President, Chief Executive
              *                   Officer and Director
- ------------------------------    (principal executive
        Johnie Schulte            officer)
 
                                Vice President and Chief
    /s/ ROBERT J. MEDLOCK         Financial Officer
- ------------------------------    (principal financial and
      Robert J. Medlock           accounting officer)
 
              *
- ------------------------------  Director
       Thomas C. Arnett
 
              *
- ------------------------------  Director
     William D. Breedlove
 
              *
- ------------------------------  Director
        Gary L. Forbes
 
              *
- ------------------------------  Director and Executive
      Leonard F. George           Vice President
 
              *
- ------------------------------  Director and Executive
          A.R. Ginn               Vice President
</TABLE>
 
                                      II-5
<PAGE>
<TABLE>
<CAPTION>
             NAME                         TITLE
- ------------------------------  --------------------------
 
<C>                             <S>
              *
- ------------------------------  Director and Vice
      Kenneth W. Maddox           President
 
              *
- ------------------------------  Director
      Robert N. McDonald
 
              *
- ------------------------------  Director
      C.A. Rundell, Jr.
 
              *
- ------------------------------  Director
       Daniel D. Zabcik
</TABLE>
 
   
<TABLE>
<S>   <C>                        <C>                         <C>
*By:    /s/ ROBERT J. MEDLOCK
      -------------------------
          Robert J. Medlock
          ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-6
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<C>    <S>
**1.1  Form of Underwriting Agreement
 
**4.1  Form of certificate representing shares of Registrant's common stock
 
 *4.2  Stock Registration Agreement dated April 10, 1989, between Registrant and
         Equus II Incorporated, formerly Equus II, L.P. (filed as Exhibit 4.2 to
         Registrant's Form S-1 registration statement no. 33-45612 and
         incorporated by reference herein)
 
 *4.3  Credit Agreement, dated March 25, 1998 (the "Credit Agreement"), by and
         among the Registrant, NationsBank, N.A. (as successor in interest to
         NationsBank of Texas, N.A.), as administrative agent ("NationsBank"),
         NationsBanc Montgomery Securities LLC, as arranger and syndication
         agent, Swiss Bank Corporation, as documentation agent ("Swiss Bank"),
         and the several lenders named therein
 
 *4.4  First Amendment to Credit Agreement, dated May 1, 1998, among the
         Registrant, NationsBank, Swiss Bank and the parties named therein
 
 *4.5  Second Amendment to Credit Agreement, dated May 5, 1998, among the
         Registrant, NationsBank, Swiss Bank and the parties named therein
 
 *4.6  Master Assignment and Acceptance, dated as of May 6, 1998, among
         NationsBank, Swiss Bank and the several lenders named therein
 
 *4.7  Facility A Notes (Revolving Credit), dated May 6, 1998, of the Registrant
         in favor of lenders named therein
 
 *4.8  Facility B Notes (Term Loan), dated May 6, 1998, of the Registrant in
         favor of lenders named therein
 
 *4.9  Facility C Notes (364-day Revolving Facility), dated May 6, 1998, of the
         Registrant in favor of lenders named therein
 
 *4.10 Guaranty, dated May 1, 1998, between NationsBank and A&S Business
         Interests, Inc.
 
 *4.11 Guaranty, dated May 1, 1998, between NationsBank and A&S Building Systems,
         L.P.
 
 *4.12 Guaranty, dated May 1, 1998, between NationsBank and NCI Building Systems,
         L.P.
 
 *4.13 Guaranty, dated May 1, 1998, between NationsBank and NCI Holding Corp.
 
 *4.14 Guaranty, dated May 1, 1998, between NationsBank and NCI Operating Corp.
 
 *4.15 Guaranty, dated May 1, 1998, between NationsBank and Metal Building
         Components Holding, Inc.
 
 *4.16 Guaranty, dated May 1, 1998, between NationsBank and Metal Coaters
         Holding, Inc.
 
 *4.17 Guaranty, dated May 1, 1998, between NationsBank and Metal Building
         Components, L.P. (formerly MBCI Operating, L.P.)
 
 *4.18 Guaranty, dated May 1, 1998, between NationsBank and Metal Coaters
         Operating, L.P.
 
 *4.19 Guaranty, dated May 13, 1998, between NationsBank and Metal Coaters of
         California, Inc.
 
 *4.20 Pledge Agreement, dated May 1, 1998, between the Registrant and
         NationsBank
 
 *4.21 Pledge Agreement, dated May 1, 1998, between NCI Holding Corp. and
         NationsBank
 
 *4.22 Pledge Agreement, dated May 13, 1998, between the Metal Coaters Holding,
         Inc. and NationsBank
 
 *4.23 Assignment of Partnership Interests, dated May 1, 1998, between NCI
         Operating Corp. and NationsBank
 
 *4.24 Assignment of Partnership Interests, dated May 1, 1998, between NCI
         Holding Corp. and NationsBank
 
 *4.25 Assignment of Partnership Interests, dated May 1, 1998, between Metal
         Building Components Holding, Inc. and NationsBank
</TABLE>
    
<PAGE>
   
<TABLE>
<C>    <S>
 *4.26 Assignment of Partnership Interests, dated May 1, 1998, between Metal
         Coaters Holding, Inc. and NationsBank
 
 *4.27 Promissory Note, dated May 5, 1998, of NCI Holding Corp. in favor of the
         Registrant
 
 *4.28 Note Pledge Agreement, dated May 5, 1998, between the Registrant and
         NationsBank
 
 *4.29 Loan Agreement "A," dated September 1, 1991, between the City of Mattoon
         and the Company (filed as Exhibit 4.11 to the Registrant's registration
         statement no. 33-45612 and incorporated by reference herein)
 
 *4.30 $250,000 Promissory Note A, dated October 31, 1991, in favor of the City
         of Mattoon executed by the Company (filed as Exhibit 4.12 to the
         Registrant's registration statement no. 33-45612 and incorporated by
         reference herein)
 
 *4.31 Loan Agreement "B," dated September 1, 1991, between the City of Mattoon
         and the Company (filed as Exhibit 4.13 to the Registrant's registration
         statement no. 33-45612 and incorporated by reference herein)
 
 *4.32 $250,000 Promissory Note B, dated January 20, 1992, in favor of the City
         of Mattoon executed by the Company (filed as Exhibit 4.14 to the
         Registrant's registration statement no. 33-45612 and incorporated by
         reference herein)
 
 *4.33 Stock Retention and Registration Agreement, dated November 13, 1995, by
         and between the Company, Doors & Building Components, Inc., and David B.
         Curtis (filed as Exhibit 4.14 to the Company's Annual Report on Form
         10-K for the fiscal year ended October 31, 1995, and incorporated by
         reference herein)
 
 *4.34 7% Convertible Subordinated Debenture dated April 1, 1996, Due April 1,
         2001, between NCI Building Systems, Inc. and John T. Eubanks (filed as
         Exhibit 4.15 to the Registrant's Annual Report on Form 10-K for the
         fiscal year ended October 31, 1996, and incorporated by reference
         herein)
 
 *4.35 Rights Agreement, dated June 24, 1998, between the Registrant and Harris
         Trust and Savings Bank (filed as Exhibit 2 to the Registrant's
         registration statement on Form 8-A and incorporated by reference herein)
 
**5.1  Legal Opinion of Gardere & Wynne, L.L.P., regarding legality of securities
         being registered
 
**23.1 Consent of Ernst & Young LLP
 
**23.2 Consent of Gardere & Wynne, L.L.P. (included in Exhibit 5.1)
 
*24.1  Power of Attorney (set forth on page II-5)
</TABLE>
    
 
- ------------------------
 
   
*   Previously filed.
    
 
   
**  Filed herewith.
    

<PAGE>



                             NCI BUILDING SYSTEMS, INC.




                                    COMMON STOCK

                                 ($0.01 Par Value)



                               UNDERWRITING AGREEMENT



____________, 1998

<PAGE>



                               UNDERWRITING AGREEMENT


                                             ____________, 1998


Warburg Dillon Read LLC
535 Madison Avenue
New York, New York  10022

J.C. Bradford & Co.
330 Commerce Street
Nashville, Tennessee 37201

Wheat First Union
Riverfront Plaza
Richmond, Virginia 23219

Dain Rauscher Wessels
(a division of Dain Rauscher Incorporated)
2711 North Haskell Avenue
Suite 2400
Dallas, Texas 75204-2936

  as Managing Underwriters

Dear Sirs:

     NCI Building Systems, Inc., a Delaware corporation (the "Company"), 
proposes to issue and sell and the persons named in Schedule B (the "Selling 
Shareholders") propose to sell to the underwriters named in Schedule A (the 
"Underwriters") an aggregate of 3,800,000 shares (the "Firm Shares") of 
Common Stock, par value $ 0.01 per share (the "Common Stock"), of the 
Company, of which 3,500,000 shares are to be issued and sold by the Company 
and an aggregate of 300,000 shares are to be sold by the Selling Shareholders 
in the respective amounts set forth opposite their names in Schedule B.  In 
addition, solely for the purpose of covering overallotments, the Company 
[and the Selling Shareholders] propose[s] to issue and sell, at the 
Underwriters' option, up to 570,000 additional shares of the Common Stock 
(the "Additional Shares") [of which _________ shares may be issued and sold by 
the Company and an aggregate of ____________ shares may be sold by the Selling
Shareholders

<PAGE>

in the respective amounts set forth opposite their names in Schedule B].  The 
Additional Shares and the Firm Shares are collectively referred to as the 
"Shares".  The Shares are described in the Prospectus which is referred to 
below.

     The Company has filed, in accordance with the provisions of the 
Securities Act of 1933, as amended, and the rules and regulations thereunder 
(collectively, the "Act"), with the Securities and Exchange Commission (the 
"Commission") a registration statement on Form S-3, including a prospectus, 
relating to the Shares, which incorporates by reference documents that the 
Company has filed in accordance with the provisions of the Securities 
Exchange Act of 1934, as amended, and the rules and regulations thereunder 
(collectively, the "Exchange Act").  The Company has furnished to you, for 
use by the Underwriters and by dealers, copies of one or more preliminary 
prospectuses and all documents incorporated by reference therein 
(collectively, the "Preliminary Prospectus") relating to the Shares.  Except 
where the context otherwise requires, the registration statement as in effect 
at the time of execution of this Agreement or, if the registration statement 
is not yet effective, as amended when it becomes effective, including all 
documents filed as a part thereof or incorporated by reference therein, and 
including any registration statement filed pursuant to Rule 462(b) under the 
Act increasing the size of the offering registered under the Act and any 
information contained in a prospectus subsequently filed with the Commission 
pursuant to Rule 424(b) under the Act and deemed to be part of the 
registration statement at the time of effectiveness pursuant to Rule 430A 
under the Act, is herein called the "Registration Statement", and the 
prospectus, including all documents incorporated therein by reference, in the 
form filed by the Company with the Commission pursuant to Rule 424(b) under 
the Act or, if no such filing is required, in the form of final prospectus 
included in the Registration Statement at the time it became effective, is 
herein called the "Prospectus".

     The Company, the Selling Shareholders and the Underwriters agree as 
follows:

     1.   SALE AND PURCHASE.  On the basis of the representations and 
warranties and the other terms and conditions herein set forth, the Company 
and each Selling Shareholder, severally and not jointly, agrees to sell to 
the respective Underwriters and each of the Underwriters, severally and not 
jointly, agrees to purchase from the Company and each Selling Shareholder the 
respective number of Firm Shares (subject to such adjustment as you may 
determine to avoid fractional shares) which bears the same 

                                       2

<PAGE>

proportion to the number of Firm Shares to be sold by the Company or by that 
Selling Shareholder, as the case may be, as the number of Firm Shares set 
forth opposite the name of such Underwriter on Schedule A bears to the total 
number of Firm Shares to be sold by the Company and the Selling Shareholders, 
in each case at a purchase price of $____ per Share.  You may release the 
Firm Shares for public sale promptly after this Agreement becomes effective.  
You may from time to time increase or decrease the public offering price 
after the initial public offering to such extent as you may determine.

     In addition, on the basis of the representations and warranties and the 
other terms and conditions herein set forth, the Company [and each Selling 
Shareholder, severally and not jointly,] hereby grants to the several 
Underwriters an option to purchase, and the Underwriters shall have the right 
to purchase, severally and not jointly, from the Company all or a portion of 
the Additional Shares as may be necessary to cover overallotments made in 
connection with the offering of the Firm Shares, at the same purchase price 
per share to be paid by the several Underwriters to the Company and the 
Selling Shareholders for the Firm Shares.  This option may be exercised in 
whole or in part from time to time on or before the thirtieth day following 
the date hereof, by written notice to the Company.  Any such notice shall set 
forth the aggregate number of Additional Shares as to which the option is 
being exercised, and the date and time when the Additional Shares are to be 
delivered (any such date and time being herein referred to as an "additional 
time of purchase"); PROVIDED, HOWEVER, that no additional time of purchase 
shall occur earlier than the time of purchase (as defined below) nor earlier 
than the second business day * after the date on which the option shall have 
been exercised nor later than the eighth business day after the date on which 
the option shall have been exercised.  The number of Additional Shares to be 
sold to each Underwriter at an additional time of purchase shall be the 
number which bears the same proportion to the aggregate number of Additional 
Shares being purchased at such additional time of purchase as the number of 
Firm Shares set forth opposite the name of such Underwriter on Schedule A 
bears to the total number of Firm Shares (subject, in each case, to such 
adjustment as you may determine to eliminate fractional shares).

- -------------------------
*    As used herein, "business day" shall mean a day on which the New York 
Stock Exchange is open for trading.

                                       3

<PAGE>


     2.   PAYMENT AND DELIVERY.  Payment of the purchase price for the Firm 
Shares shall be made to the Company and to the Attorney-in-fact referred to 
in Section 4(d) on behalf of the Selling Shareholders by certified or 
official bank checks, in immediately available funds, at the office of 
Warburg Dillon Read LLC in New York City, against delivery of the 
certificates for the Firm Shares to you for the respective accounts of the 
Underwriters.  Such payment and delivery shall be made at 9:30 A.M., New York 
City time, on ____________, 1998 (unless another time shall be agreed to by 
you, the Company and the Selling Shareholders or unless postponed in 
accordance with the provisions of Section 10).  The time at which such 
payment and delivery are actually made is called the "time of purchase".  
Certificates for the Firm Shares shall be delivered to you in definitive form 
in such names and in such denominations as you shall specify on the second 
business day preceding the time of purchase.  For the purpose of expediting 
the checking of the certificates for the Firm Shares by you, the Company and 
the Selling Shareholders agree to make such certificates available to you for 
such purpose at least one full business day preceding the time of purchase.

     Payment of the purchase price for the Additional Shares shall be made at 
the additional time of purchase in the same manner and at the same office as 
the payment for the Firm Shares.  Certificates for the Additional Shares 
shall be delivered to you in definitive form in such names and in such 
denominations as you shall specify on the second business day preceding the 
additional time of purchase.  For the purpose of expediting the checking of 
the certificates for the Additional Shares by you, the Company and the 
Selling Shareholders agree to make such certificates available to you for 
such purpose at least one full business day preceding the additional time of 
purchase.

     3.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY AND THE SELLING 
SHAREHOLDERS.  The Company and each of the Selling Shareholders, jointly and 
severally, represent and warrant to each of the Underwriters that:

          (a)  Each Preliminary Prospectus filed as part of the Registration
     Statement as originally filed or as part of any amendment thereto, or filed
     pursuant to Rule 424 under the Act, complied when so filed in all material
     respects with the Act; when the Registration Statement becomes or became
     effective and at all times subsequent thereto up to the time of purchase
     and the additional time of purchase, the Registration Statement and the
     Prospectus, and any supplements or amendments thereto, complied and will
     comply in all material 

                                       4

<PAGE>

     respects with the provisions of the Act; and the Registration Statement at
     all such times did not and will not contain an untrue statement of a 
     material fact or omit to state a material fact required to be stated 
     therein or necessary to make the statements therein not misleading, and 
     the Prospectus at all such times did not and will not contain an untrue 
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements therein, in light of
     the circumstances under which they were made, not misleading; PROVIDED, 
     HOWEVER, that the Company and the Selling Shareholders make no 
     representation or warranty with respect to any statement contained in the 
     Registration Statement or the Prospectus in reliance upon and in conformity
     with information concerning the Underwriters and furnished in writing by or
     on behalf of any Underwriter through you to the Company expressly for use 
     in the Registration Statement or the Prospectus and set forth in the 
     section of the Registration Statement and the Prospectus entitled 
     "Underwriting"; the documents incorporated by reference in the Prospectus, 
     at the time they were filed with the Commission, complied in all material 
     respects with the requirements of the Exchange Act, and do not contain an 
     untrue statement of a material fact or omit to state a material fact 
     required to be stated therein or necessary to make the statements therein,
     in light of the circumstances under which they were made, not misleading.

          (b)  As of the date of this Agreement, the Company has an authorized
     capitalization as set forth under the column entitled "April 30, 1998
     Actual" in the section of the Registration Statement and the Prospectus
     entitled "Capitalization" and, as of the time of purchase, the
     capitalization of the Company will be as set forth under the column
     entitled "April 30, 1998 As Adjusted" in the section of the Registration
     Statement and the Prospectus entitled "Capitalization"; all of the issued
     and outstanding shares of capital stock of the Company have been duly
     authorized and validly issued and are fully paid and nonassessable and are
     free of statutory and contractual preemptive rights. 

          (c)  The Company has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware with
     full power and authority to (i) own its properties and conduct its business
     as described in the Registration Statement and the Prospectus and
     (ii) execute and deliver this Agreement and to issue, sell and deliver the
     Shares as herein contemplated.

                                       5

<PAGE>

          (d)  Except as described in the Prospectus with respect to Doublecote,
     L.L.C., Metallic de Mexico, S.A. de C.V., Building Systems de Mexico, S.A.
     de C.V. and Midwest Metal Coating, L.L.C., all of the issued and
     outstanding shares of capital stock of each of the subsidiaries of the
     Company (the "Subsidiaries") are owned directly by the Company; all of such
     shares have been duly authorized and validly issued and are fully paid and
     nonassessable and, except as described in the Prospectus, are owned free
     and clear of any pledge, lien, encumbrance, security interest or other
     claim; there are no outstanding rights, subscriptions, warrants, calls,
     preemptive rights, options or other agreements of any kind with respect to
     the capital stock of any of the Subsidiaries.

          (e)  Each of the corporate Subsidiaries has been duly incorporated and
     is validly existing as a corporation in good standing under the laws of its
     respective jurisdiction of incorporation, with full corporate power and
     authority to own its respective properties and to conduct its respective
     businesses.  Each of the limited partnership Subsidiaries has been duly
     organized and is validly existing as a limited partnership in good standing
     (or the equivalent thereto) under the laws of its respective jurisdiction
     of organization, with full limited partnership power and authority to own
     its respective properties and to conduct its respective businesses.

          (f)  Each of the Company and each of the Subsidiaries is duly
     qualified or licensed by and is in good standing (or the equivalent
     thereto) in each jurisdiction in which it owns or leases property or
     conducts its business and in each other jurisdiction in which the failure,
     individually or in the aggregate, to be so qualified or licensed could have
     a material adverse effect on the properties, assets, operations, business,
     business prospects or condition (financial or other) of the Company and the
     Subsidiaries taken as a whole; each of the Company and each of the
     Subsidiaries is in compliance in all material respects with the laws,
     orders, rules, regulations and directives issued or administered by each
     such jurisdiction.

          (g)  Neither the Company nor any of the Subsidiaries is in breach of,
     or in default under (nor has any event occurred which with notice, lapse of
     time or both would constitute a breach of, or default under), its charter
     or bylaws, or in the performance or observance of any obligation,
     agreement, covenant or condition contained in any license, indenture,
     lease, 

                                       6

<PAGE>


     mortgage, deed of trust, bank loan or credit agreement, material supply 
     agreement or other agreement or instrument to which the Company or any of 
     the Subsidiaries is a party or by which any of them may be bound or 
     affected.  The execution, delivery and performance of this Agreement, 
     the issuance and sale of the Shares, the application of the net proceeds 
     thereof as described in the Prospectus and the consummation of the 
     transactions contemplated hereby will not conflict with, or result in 
     any breach of or constitute a default under (nor constitute any event 
     which with notice, lapse of time or both would constitute a breach of, 
     or default under), the charter bylaws or other organizational document 
     of the Company or any of the Subsidiaries or under any provision of any 
     license, indenture, lease, mortgage, deed of trust, bank loan or credit 
     agreement, material supply agreement or other agreement or instrument to 
     which the Company or any of the Subsidiaries is a party or by which any 
     of them or their properties may be bound or affected, or under any 
     federal, state, local or foreign law, regulation or rule or any decree, 
     judgment or order applicable to the Company or any of the Subsidiaries.

          (h)  The Firm Shares and the Additional Shares, when issued and 
     delivered to and paid for by the Underwriters as contemplated hereby, 
     will be duly authorized and validly issued and fully paid and 
     nonassessable, free and clear of any pledge, lien, encumbrance, security 
     interest, preemptive right or other claim.

          (i)  This Agreement has been duly authorized, executed and 
     delivered by the Company.

          (j)  The capital stock of the Company, including the Shares, 
     conforms in all material respects to the description thereof contained 
     in the Registration Statement and the Prospectus; and the certificates 
     for the Shares are in due and proper form and the holders of the Shares 
     after making payment therefor will not be subject to personal liability 
     by reason of being such holders.

          (k)  No approval, authorization, consent or order of or filing with 
     any federal, state, local or foreign governmental or regulatory 
     commission, board, body, authority or agency is required in connection 
     with the issuance and sale of the Shares as contemplated hereby, other 
     than registration of the Shares under the Act, clearance of the offering 
     of the Shares with the National Association of Securities Dealers, Inc. 
     (the

                                       7

<PAGE>

     "NASD") and any necessary qualification under the securities or blue sky 
     laws of the various jurisdictions in which the Shares are being offered 
     by the Underwriters.

          (l)  Each person who has the right, contractual or otherwise, to 
     cause the Company to register pursuant to the Act any securities of the 
     Company in consequence of the issue and sale of the Shares to the 
     Underwriters hereunder either included such securities in the 
     Registration Statement or duly waived such right and each person who has 
     the right, contractual or otherwise, to cause the Company to issue to it 
     any securities of the Company in consequence of the issue and sale of 
     the Shares to the Underwriters hereunder has duly waived such right.

          (m)  Ernst & Young LLP, whose reports on the consolidated financial 
     statements of the Company and the Subsidiaries are included or 
     incorporated by reference in the Registration Statement and the 
     Prospectus, are independent public accountants with respect to the 
     Company as required by the Act and the applicable published rules and 
     regulations thereunder.

          (n)  All legal or governmental proceedings, contracts or documents 
     of a character required to be described in the Registration Statement or 
     the Prospectus or to be filed as an exhibit to the Registration 
     Statement have been so described or filed as required.

          (o)  There is no action, suit or proceeding pending or threatened 
     against the Company or any of the Subsidiaries or any of their 
     properties, at law or in equity, or before or by any federal, state, 
     local or foreign governmental or regulatory commission, board, body, 
     authority or agency that could result in a judgment, decree or order 
     having a material adverse effect on the properties, assets, operations, 
     business, business prospects or condition (financial or other) of the 
     Company and the Subsidiaries taken as a whole.

          (p)  The audited and unaudited financial statements included in the 
     Registration Statement and the Prospectus present fairly the 
     consolidated financial condition of the Company and the Subsidiaries as 
     of the dates indicated and the consolidated results of operations and 
     cash flows of the Company and the Subsidiaries for the periods 
     specified; such financial statements have been prepared in conformity 
     with generally accepted accounting principles applied on a 

                                       8

<PAGE>

     consistent basis during the periods involved.  The pro forma financial 
     statements contained in the Registration Statement and Prospectus have 
     been prepared on a basis consistent with the financial statements 
     referred to above and, except for the pro forma adjustments specified 
     therein, include all material adjustments to the historical financial 
     data required by Rule 11-02 of Regulation S-X to reflect the MBCI 
     Acquisition and the Offering (as defined in the Prospectus), and give 
     effect to assumptions made on a reasonable basis and present fairly the 
     historical and proposed transactions contemplated by the Prospectus and 
     this Agreement.

          (q)  Subsequent to the respective dates as of which information is 
     given in the Registration Statement and the Prospectus, and except as 
     may be otherwise stated in the Registration Statement or the Prospectus, 
     there has not been:  (A) any material adverse change in the properties, 
     assets, operations, business, business prospects or condition (financial 
     or other), present or prospective, of the Company and the Subsidiaries 
     taken as a whole; (B) any transaction, that is material to the Company 
     and the Subsidiaries taken as a whole, contemplated or entered into by 
     the Company or any of the Subsidiaries; or (C) any obligation, 
     contingent or otherwise, directly or indirectly incurred by the Company 
     or any of the Subsidiaries that is material to the Company and the 
     Subsidiaries taken as a whole.

          (r)  The Company has obtained the agreement of the shareholders 
     listed on Schedule C not to sell, contract to sell, grant any option to 
     sell, transfer or otherwise dispose of, directly or indirectly, any 
     shares of Common Stock, or securities convertible into or exchangeable 
     for Common Stock or warrants or other rights to purchase Common Stock 
     for a period of 90 days from the date of the Prospectus without the 
     prior written consent of Warburg Dillon Read LLC.

          (s)  Neither the Company nor any of the Subsidiaries has violated 
     any foreign, federal, state or local law or regulation relating to the 
     protection of human health and safety, the environment or hazardous or 
     toxic substances or wastes, pollutants or contaminants ("Environmental 
     Laws"), nor any federal or state law relating to discrimination in the 
     hiring, promotion or pay of employees nor any applicable federal or 
     state wages and hours laws, nor any provisions of the Employee 
     Retirement Income Security Act or the rules and regulations promulgated 

                                       9

<PAGE>

     thereunder, which in each case might result in any material adverse 
     effect on the properties, assets, operations, business, business 
     prospects or condition (financial or other) of the Company and the 
     Subsidiaries taken as a whole.

          (t)  The Company and each of the Subsidiaries has such permits, 
     licenses, franchises and authorizations of governmental or regulatory 
     authorities ("permits"), including without limitation under any 
     applicable Environmental Laws, as are necessary to own, lease and 
     operate its respective properties and to conduct its business; the 
     Company and each of the Subsidiaries has fulfilled and performed all of 
     its material obligations with respect to such permits and no event has 
     occurred which allows, or after notice or lapse of time would allow, 
     revocation or termination thereof or results in any other material 
     impairment of the rights of the holder of any such permit; and, except 
     as described in the Prospectus, such permits contain no restrictions 
     that are materially burdensome to the Company or any of the Subsidiaries.

          (u)  In the ordinary course of its business, the Company conducts a 
     periodic review of the effect of Environmental Laws on the business, 
     operations and properties of the Company and the Subsidiaries, in the 
     course of which it identifies and evaluates associated costs and 
     liabilities (including without limitation any capital or operating 
     expenditure required for clean-up, closure of properties or compliance 
     with Environmental Laws or any permit, license or approval, any related 
     constraints on operating activities and any potential liabilities to 
     third parties).  On the basis of such review, the Company reasonably has 
     concluded that such associated costs and liabilities, singly or in the 
     aggregate, would not have a material adverse effect on the properties, 
     assets, operations, business, business prospects or condition (financial 
     or other) of the Company and the Subsidiaries taken as a whole.

          (v)  Neither the Company nor any of the Subsidiaries, nor any 
     employee of the Company or any of the Subsidiaries, has made any payment 
     of funds of the Company or any of the Subsidiaries prohibited by law, 
     and no funds of the Company or any of the Subsidiaries have been set 
     aside to be used for any payment prohibited by law.

          (w)  The Company and the Subsidiaries have filed all federal or 
     state income or franchise tax returns required to be filed and have paid 
     all taxes shown 

                                       10

<PAGE>

     thereon as due, and there is no material tax deficiency which has been 
     or might be asserted against the Company or any of the Subsidiaries; all
     material tax liabilities are adequately provided for on the books of the 
     Company and the Subsidiaries.

          (x)  The Company has not incurred any liability for any finder's 
     fees or similar payments in connection with the transactions herein 
     contemplated.

          (y)  The Company and the Subsidiaries have good title to all 
     properties and assets owned or leased by them, in each case free and 
     clear of all liens, security interests, pledges, charges, encumbrances, 
     mortgages and defects (except such as are described or referred to in 
     the Prospectus and the financial statements and the notes thereto 
     contained therein or such as do not interfere with the use made and 
     proposed to be made of such property by the Company and the 
     Subsidiaries).

          (z)  Neither the Company nor any of the Subsidiaries is an 
     "investment company" within the meaning of the Investment Company Act of 
     1940, as amended, or is subject to regulation under such Act.

     4.   FURTHER REPRESENTATIONS AND WARRANTIES OF THE SELLING SHAREHOLDERS.  
Each Selling Shareholder, severally and not jointly, further represents and 
warrants to each Underwriter that:

          (a)  Such Selling Shareholder is and at the time of delivery of the 
     Shares to be sold by such Selling Shareholder will be the lawful owner 
     of the number of Shares or securities convertible into or warrants 
     exercisable for the number of Shares to be sold by such Selling 
     Shareholder pursuant to this Agreement and, at the time of delivery 
     thereof, will have valid and marketable title to such Shares, and upon 
     delivery of and payment for such Shares the Underwriters will acquire 
     valid and marketable title to such Shares free and clear of any claim, 
     lien, encumbrance, security interest, community property right, 
     restriction on transfer or other defect in title, assuming each of the 
     Underwriters has purchased the Shares purchased by it in good faith and 
     without notice of any adverse claim.

          (b)  Such Selling Shareholder has and at the time of delivery of 
     such Shares will have full legal right, power and capacity, and any 
     approval required by law to sell, assign, transfer and deliver such 
     Shares in the manner provided in this Agreement.

                                       11

<PAGE>

          (c)  This Agreement has been duly authorized, executed and 
     delivered by such Selling Shareholder.  The Power of Attorney executed 
     by the Selling Shareholders (the "Power of Attorney") and the Custody 
     Agreement among the Selling Shareholders and Harris Trust and Savings 
     Bank (the "Custody Agreement") have been duly executed and delivered by 
     such Selling Shareholder and are legal, valid and binding agreements of 
     such Selling Shareholder, enforceable in accordance with their terms, 
     except as the enforceability thereof may be limited by bankruptcy, 
     insolvency, reorganization, moratorium or similar laws affecting 
     creditors' rights generally and general principles of equity.

          (d)  Such Selling Shareholder has duly and irrevocably authorized 
     the Attorney-in-Fact (as defined in the Power of Attorney), on behalf of 
     such Selling Shareholder, to execute and deliver this Agreement and any 
     other document necessary or desirable in connection with the 
     transactions contemplated hereby and to deliver the Shares to be sold by 
     such Selling Shareholder and receive payment therefor pursuant hereto.

          (e)  The sale of the Shares by such Selling Shareholder pursuant 
     hereto is not prompted by any material adverse information concerning 
     the Company; and all information furnished in writing by or on behalf of 
     such Selling Shareholder specifically for use in the Registration 
     Statement and the Prospectus, and any supplement or amendment thereto, 
     is and will be when the Registration Statement became effective and at 
     all times subsequent thereto up to the time of purchase [AND THE 
     ADDITIONAL TIME OF PURCHASE], true and correct and complete and at all 
     such times did not and will not contain any untrue statement of material 
     fact or omit to state a material fact required to be stated therein or 
     necessary to make the statements therein, in light of the circumstances
     under which they were made, not misleading.

          (f)  The consummation of the transactions contemplated hereby and 
     by the Power of Attorney and by the Custody Agreement and the 
     fulfillment of the terms hereof and thereof will not constitute a breach 
     or violation of or default under any trust, indenture, agreement or 
     other instrument to which any such Selling Shareholder is a party or by 
     which any such Selling Shareholder is bound.

                                       12

<PAGE>

     5.   CERTAIN COVENANTS OF THE COMPANY.  The Company hereby agrees:

          (a)  to furnish such information as may be required and otherwise 
     to cooperate in qualifying the Shares for offering and sale under the 
     securities or blue sky laws of such states as you may designate and to 
     maintain such qualifications in effect as long as required for the 
     distribution of the Shares, provided that the Company shall not be 
     required to qualify as a foreign corporation or to consent to the 
     service of process under the laws of any such state (except service of 
     process with respect to the offering and sale of the Shares); promptly 
     to advise you of the receipt by the Company of any notification with 
     respect to the suspension of the qualification of the Shares for sale in 
     any jurisdiction or the initiation or threatening of any proceeding for 
     such purpose; and to use its best efforts to obtain the withdrawal of 
     any order of suspension at the earliest practicable moment;

          (b)  to make available to you in New York City, as soon as 
     practicable after the Registration Statement becomes effective, and 
     thereafter from time to time to furnish to the Underwriters, as many 
     copies of the Prospectus (or of the Prospectus as amended or 
     supplemented if the Company shall have made any amendment or supplement 
     thereto after the effective date of the Registration Statement) as the 
     Underwriters may request for the purposes contemplated by the Act;

          (c)  to advise you promptly and if requested by you to confirm such 
     advice in writing, (i) when the Registration Statement has become 
     effective and when any post-effective amendment thereto becomes 
     effective and (ii) when the Prospectus is filed with the Commission 
     pursuant to Rule 424(b) under the Act, if required under the Act (which 
     the Company agrees to file in a timely manner under such Rule);

          (d)  to advise you promptly, confirming such advice in writing, of 
     any request by the Commission for amendments or supplements to the 
     Registration Statement or the Prospectus or for additional information 
     with respect thereto, or of notice of institution of proceedings for or 
     the entry of a stop order suspending the effectiveness of the 
     Registration Statement and, if the Commission should enter a stop order 
     suspending the effectiveness of the Registration Statement, to use its 
     best efforts to obtain the lifting or removal of such order as soon as 
     possible; to advise you promptly of any proposal to amend or supplement 
     the Registration 

                                       13

<PAGE>

     Statement or the Prospectus, including by filing any document that would 
     be incorporated therein by reference, and to file no such amendment or 
     supplement to which you shall object in writing;

          (e)  to furnish to you and, upon request to each of the other 
     Underwriters, for a period of five years from the date of this Agreement 
     (i) copies of all reports or other communications that the Company shall 
     send to its shareholders or from time to time shall publish or publicly 
     disseminate and (ii) copies of all annual, quarterly and current reports 
     filed with the Commission on Forms 10-K, 10-Q and 8-K, or such other 
     similar form as may be designated by the Commission, and any other 
     document filed by the Company pursuant to Section 12, 13, 14 or 15(d) of 
     the Exchange Act;

          (f)  to advise the Underwriters promptly of the happening of any 
     event known to the Company within the time during which a prospectus 
     relating to the Shares is required to be delivered under the Act that, 
     in the reasonable judgment of the Company, would require the making of 
     any change in the Prospectus then being used, or in the information 
     incorporated therein by reference, so that the Prospectus, as then 
     supplemented, would not include an untrue statement of a material fact 
     or omit to state a material fact necessary to make the statements 
     therein, in the light of the circumstances under which they are made, 
     not misleading and, during such time, promptly to prepare and furnish, 
     at the Company's expense, to the Underwriters such amendments or 
     supplements to such Prospectus as may be necessary to reflect any such 
     change in such quantities as requested by the Underwriters, and to 
     furnish to you a copy of such proposed amendment or supplement before 
     filing any such amendment or supplement with the Commission;

          (g)  to make generally available to its security holders, and to 
     deliver to you, an earnings statement of the Company (which need not be 
     audited and which will satisfy the provisions of Section 11(a) of the 
     Act including, at the option of the Company, Rule 158) covering a period 
     of 12 months beginning after the effective date of the Registration 
     Statement but ending not later than 15 months after the date of the 
     Registration Statement, as soon as is reasonably practicable after the 
     termination of such 12-month period;

          (h)  to furnish to you five signed copies of the Registration 
     Statement, as initially filed with the 

                                       14

<PAGE>

     Commission, and of all amendments thereto (including all exhibits thereto 
     and documents incorporated by reference therein) and sufficient conformed 
     copies of the foregoing (other than exhibits) for distribution of a copy 
     to each of the other Underwriters; 

          (i)  to furnish to you as early as practicable prior to the time of 
     purchase and the additional time of purchase, as the case may be, but 
     not later than two business days prior thereto, a copy of the latest 
     available unaudited interim consolidated financial statements, if any, 
     of the Company and the Subsidiaries that have been read by the Company's 
     independent certified public accountants as stated in their letter to be 
     furnished pursuant to Section 8(b);

          (j)  to apply the net proceeds from the sale of the Shares sold by 
     the Company in the manner set forth under the caption "Use of Proceeds" 
     in the Registration Statement and the Prospectus;

          (k)  to use its best efforts to cause the Shares to be approved for 
     listing on the New York Stock Exchange;

          (l)  whether or not the transactions contemplated in this Agreement 
     are consummated or this Agreement otherwise becomes effective or is 
     terminated, to pay all expenses, fees and taxes (other than (x) any 
     transfer taxes and (y) fees and disbursements of your counsel except as 
     set forth under Section 5 and clauses (iv) and (vi) below) in connection 
     with (i) the preparation and filing of the Registration Statement, each 
     Preliminary Prospectus, the Prospectus and any amendment or supplement 
     thereto, and the printing and furnishing of copies of each thereof to 
     you and to dealers (including costs of mailing and shipment), (ii) the 
     issuance, sale and delivery of the Shares, (iii) the word processing or 
     printing of this Agreement and any dealer agreements, and the 
     reproduction or printing and furnishing of copies of each thereof to you 
     and to dealers (including costs of mailing and shipment), (iv) the 
     qualification of the Shares for offering and sale under state laws as 
     aforesaid (including legal fees and filing fees and other disbursements 
     of your counsel) and the printing and furnishing of copies of any blue 
     sky surveys to you and to dealers, (v) any listing of the Shares on any 
     securities exchange or qualification of the Shares for listing on the 
     New York Stock Exchange and any registration thereof under the Exchange 
     Act, (vi) any filing for review of the public offering of the Shares 

                                       15

<PAGE>

     by the NASD and (viii) the performance of the Company's and the Selling 
     Shareholders' other obligations hereunder;

          (m)  not to sell, contract to sell, grant any option to sell, 
     transfer or otherwise dispose of, directly or indirectly, any shares of 
     Common Stock or securities convertible into or exchangeable for Common 
     Stock or warrants or other rights to purchase Common Stock or permit the 
     registration under the Act of any shares of Common Stock, except for the 
     registration of the Shares and the sales to you pursuant to this 
     Agreement for a period commencing on the date hereof and continuing for 
     90 days after the date of the Prospectus, without the prior written 
     consent of Warburg Dillon Read LLC; and

          (n)  to refrain from investing the proceeds from the sale of the 
     Shares in a manner to cause the Company or any of the Subsidiaries to 
     become an "investment company" within the meaning of the Investment 
     Company Act of 1940, as amended.

     6.   CERTAIN COVENANTS OF THE SELLING SHAREHOLDERS.  Each Selling 
Shareholder agrees with each Underwriter that such Selling Shareholder will 
not sell, contract to sell, grant any option to sell, transfer or otherwise 
dispose of, directly or indirectly, any shares of Common Stock or securities 
convertible into or exchangeable for Common Stock or warrants or other rights 
to purchase Common Stock, except for the sales to you pursuant to this 
Agreement, for a period commencing on the date hereof and continuing for 90 
days after the date of the Prospectus, without the prior written consent of 
Warburg Dillon Read LLC.

     7.   REIMBURSEMENT OF UNDERWRITERS' EXPENSES.  If the Firm Shares or the 
Additional Shares are not delivered for any reason, other than the failure of 
the Underwriters to purchase the Firm Shares or the Additional Shares as 
provided herein (unless such failure is permitted under the provisions of 
Section 8 or Section 9(b) of this Agreement), the Company will reimburse the 
Underwriters for all of their out-of-pocket expenses, including the fees and 
disbursements of their counsel.

     8.   CONDITIONS OF UNDERWRITERS' OBLIGATIONS.  The several obligations 
of the Underwriters hereunder are subject to the accuracy of the 
representations and warranties on the part of the Company and the Selling 
Shareholders on the date hereof and at the time of purchase (and the several 
obligations of the Underwriters at any 

                                       16

<PAGE>

additional time of purchase are subject to the accuracy of the 
representations and warranties on the part of the Company and the Selling 
Shareholders on the date hereof and at the time of purchase and at such 
additional time of purchase, as the case may be), the performance by each of 
the Company and the Selling Shareholders of their obligations hereunder and 
to the following conditions:

          (a)  The Company shall furnish to you at the time of purchase and 
     at such additional time of purchase, as the case may be, an opinion of 
     Gardere & Wynne, L.L.P., counsel for the Company and the Selling 
     Shareholders, addressed to the Underwriters and dated the time of 
     purchase or such additional time of purchase, as the case may be, with 
     reproduced copies for each of the other Underwriters and in form 
     satisfactory to Gibson, Dunn & Crutcher LLP, counsel for the 
     Underwriters, stating that:

            (i)  the Company has been duly incorporated and is validly existing
          as a corporation in good standing under the laws of the State of 
          Delaware, with full corporate power and authority (A) to own its 
          properties and conduct its business as described in the 
          Registration Statement and the Prospectus and (B) to execute and 
          deliver this Agreement and to issue, sell and deliver the Shares as 
          herein contemplated;

           (ii)  each of the Subsidiaries has been duly incorporated (or, in 
          the case of limited partnership Subsidiaries, duly organized) and 
          is validly existing as a corporation or limited partnership, as the 
          case may be, in good standing (or equivalent thereto) under the 
          laws of the state in which such Subsidiary is incorporated, with 
          full corporate power and authority (or, in the case of limited 
          partnership Subsidiaries, full limited partnership power and 
          authority) to own its properties and to conduct its business as 
          described in the Registration Statement and the Prospectus;

           (iii) each of the Company and each of the Subsidiaries is duly 
          qualified or licensed to do business by and is in good standing as 
          a foreign corporation, or foreign limited partnership, as the case 
          may be, in each jurisdiction in which it conducts business or owns 
          property and in which the failure, individually or in the 
          aggregate, to be so licensed or qualified could have a material 
          adverse effect on the properties, assets, 

                                       17

<PAGE>

          operations, business, business prospects or condition (financial or 
          other) of the Company and the Subsidiaries taken as a whole;

           (iv)  all of the issued and outstanding shares of capital stock 
          (including partnership interests) of each Subsidiary have been duly 
          authorized and validly issued and are fully paid and nonassessable 
          and, except as set forth in the Prospectus, are owned, directly or 
          indirectly, by the Company free and clear of any pledge, lien, 
          encumbrance, security interest, preemptive right or other claim, 
          and there are no rights, warrants, options or other agreements to 
          acquire or instruments convertible into or exchangeable for any 
          shares of capital stock or other equity interest of any Subsidiary, 
          except as set forth in the Prospectus;

           (v)  this Agreement has been duly authorized, executed and 
          delivered by the Company;

           (vi)  (a) the Shares, when delivered to and paid for by the 
          Underwriters, will be duly authorized, validly issued, fully paid 
          and nonassessable, and will be free of any pledge, lien, 
          encumbrance, claim or preemptive right; and (b) the certificates for 
          the Shares are in due and proper form and the holders of the Shares 
          will not be subject to personal liability by reason of being such 
          holders;

           (vii)  (a) the Company has an authorized capitalization as set 
          forth under the heading "Capitalization" in the Registration 
          Statement and the Prospectus, and (b) the outstanding shares of 
          capital stock of the Company have been duly authorized and validly 
          issued and are fully paid, nonassessable and free of statutory and 
          contractual preemptive rights;

           (viii)  the capital stock of the Company, including the Shares, 
          conforms in all material respects to the description thereof 
          contained in the Registration Statement and the Prospectus;

            (ix)   the Registration Statement and the Prospectus (except as 
          to the financial statements and schedules contained or incorporated 
          by reference therein as to which such counsel need express no 
          opinion) comply as to form in all 

                                       18

<PAGE>

          material respects with the requirements of the Act;

            (x)  the Registration Statement has become effective under the 
          Act and, to the best of such counsel's knowledge, no stop order 
          proceedings with respect thereto are pending or threatened under 
          the Act;

           (xi)   no approval, authorization, consent or order of or filing 
          with any federal, state, local or foreign governmental or 
          regulatory commission, board, body, authority or agency is required 
          in connection with the issuance or sale of the Shares as 
          contemplated hereby other than registration of the Shares under the 
          Act (except such counsel need express no opinion as to any 
          necessary qualification under the state securities or blue sky laws 
          of the various jurisdictions in which the Shares are being offered 
          by the Underwriters);

          (xii)   the execution, delivery and performance of this Agreement 
          by the Company, the issuance and sale of the Shares, the 
          application of the net proceeds thereof as described in the 
          Prospectus and the consummation by the Company of the transactions 
          contemplated hereby do not and will not conflict with, or result in 
          any breach of, or constitute a default under (nor constitute any 
          event which with notice, lapse of time or both would constitute a 
          breach of or default under), the charter or bylaws of the Company 
          or any of the Subsidiaries, or any provision of any license, 
          indenture, lease, mortgage, deed of trust, bank loan or credit 
          agreement or other agreement or instrument to which the Company or 
          any of the Subsidiaries is a party or by which the Company or any 
          of the Subsidiaries or their properties are bound or affected, or 
          under any federal, state, local or foreign law, regulation or rule 
          or any decree, judgment or order applicable to the Company or any 
          of the Subsidiaries;

          (xiii)   to the best of such counsel's knowledge, neither the 
          Company nor any of the Subsidiaries is in breach of or in default 
          under (nor has any event occurred which with notice, lapse of time 
          or both would constitute a breach of or default under) any license, 
          indenture, lease, mortgage, deed of trust, bank loan or credit 
          agreement or any other agreement or instrument to which the Company 
          or any of the Subsidiaries is a party or 

                                       19

<PAGE>

          by which the Company or any of the Subsidiaries or their properties 
          are bound or affected or under any law, regulation or rule or any 
          decree, judgment or order applicable to the Company or any of the 
          Subsidiaries, except for such matters as could not, individually or 
          in the aggregate, have a material adverse effect on the properties, 
          assets, operations, business, business prospects or condition 
          (financial or other) of the Company and the Subsidiaries taken as a 
          whole;

           (xiv)  to the best of such counsel's knowledge, after due inquiry, 
          neither the Company nor any of the Subsidiaries has violated any 
          Environmental Laws, nor any federal or state law relating to 
          discrimination in the hiring, promotion or pay of employees nor any 
          applicable federal or state wages and hours laws, nor any 
          provisions of the Employee Retirement Income Security Act or the 
          rules and regulations promulgated thereunder, which in each case 
          might result in any material adverse effect on the properties, 
          assets, operations, business, business prospects or condition 
          (financial or other) of the Company and the Subsidiaries taken as a 
          whole;

            (xv)  the Company and each of the Subsidiaries has such permits, 
          licenses, franchises and authorizations of governmental or 
          regulatory authorities ("permits"), including without limitation 
          under any applicable Environmental Laws, as are necessary to own, 
          lease and operate its respective properties and to conduct its 
          business in the manner described in the Prospectus; to the best of 
          such counsel's knowledge, after due inquiry, the Company and each 
          of the Subsidiaries has fulfilled and performed all of its material 
          obligations with respect to such permits and no event has occurred 
          which allows, or after notice or lapse of time would allow, 
          revocation or termination thereof or results in any other material 
          impairment of the rights of the holder of any such permit, subject 
          in each case to such qualification as may be set forth in the 
          Prospectus; and, except as described in the Prospectus, such 
          permits contain no restrictions that are materially burdensome to 
          the Company or any of the Subsidiaries;

           (xvi)  all contracts or documents of a character required to be
          described in the Registration Statement or the Prospectus or to be

                                       20

<PAGE>

          filed as an exhibit to the Registration Statement have been so 
          described or filed;

          (xvii)  except as described in the Registration Statement and the 
          Prospectus, there are no actions, suits or proceedings of which 
          such counsel has knowledge pending or threatened against the 
          Company or any of the Subsidiaries, or any of their respective 
          properties, at law or in equity, or before or by any federal, 
          state, local or foreign governmental or regulatory commission, 
          board, body, authority or agency that individually or in the 
          aggregate could result in a judgment, decree or order having a 
          material adverse effect on the properties, assets, operations, 
          business, business prospects or condition (financial or other) of 
          the Company and the Subsidiaries taken as a whole;

          (xviii)  the documents incorporated by reference in the 
          Registration Statement and Prospectus, when they were filed (or, if 
          an amendment with respect to any such document was filed, when such 
          amendment was filed), complied as to form in all material respects 
          with the Exchange Act (except as to the financial statements and 
          schedules and other financial and statistical data contained or 
          incorporated by reference therein, as to which such counsel need 
          express no opinion);

           (xix)  to the best of such counsel's knowledge, each person who 
          has the right, contractual or otherwise, to cause the Company to 
          register pursuant to the Act any securities of the Company in 
          consequence of the issue and sale of the Shares to the Underwriters 
          hereunder either included such securities in the Registration 
          Statement or duly waived such right and each person who has the 
          right, contractual or otherwise, to cause the Company to issue to 
          it any securities of the Company in consequence of the issue and 
          sale of the Shares to the Underwriters hereunder has duly waived 
          such right;

            (xx)  the statements in the Registration Statement and the 
          Prospectus under the captions "Business -- Regulatory Matters" and 
          "Risk Factors -- Shares Eligible For Future Sale" and in the 
          Company's Registration Statement on Form 8-A dated July 20, 1998 
          under the caption "Description of Capital Stock," insofar as they 
          are descriptions of laws, regulations and rules, of legal and 

                                       21

<PAGE>

          governmental proceedings or of contracts, agreements, leases and 
          other legal documents, or refer to statements of law or legal 
          conclusions, have been reviewed by such counsel and are accurate in 
          all material respects;

           (xxi)  neither the Company nor any of the Subsidiaries is an 
          "investment company" or a person "controlled" by an "investment 
          company" within the meaning of the Investment Company Act of 1940, 
          as amended;

          (xxii)  this Agreement, the Power of Attorney and the Custody 
          Agreement have been duly executed and delivered by each of the 
          Selling Shareholders; the Power of Attorney and the Custody 
          Agreement are legal, valid and binding agreements of each of the 
          Selling Shareholders enforceable in accordance with their 
          respective terms, except as the enforceability thereof may be 
          limited by bankruptcy, insolvency, reorganization, moratorium or 
          similar laws affecting creditors' rights generally and general 
          principles of equity;

         (xxiii)  each of the Selling Shareholders has full legal right and 
          power, and has obtained any authorization or approval required by 
          law (other than those imposed by the Act and the securities or blue 
          sky laws of certain jurisdictions), to sell, assign, transfer and 
          deliver the Shares to be sold by such Selling Shareholder in the 
          manner provided in this Agreement;

          (xxiv)  delivery of certificates for the Shares to be sold by the 
          Selling Shareholders pursuant hereto will pass title thereto to the 
          Underwriters severally, free and clear of any claim, lien, 
          encumbrance, security interest, community property right, 
          restriction on transfer or other defect in title assuming that the 
          several Underwriters are good faith purchasers and without notice 
          of any adverse claim;

           (xxv)  to the best of such counsel's knowledge, the consummation 
          of the transactions contemplated hereby and by the Power of 
          Attorney and the Custody Agreement and the fulfillment of the terms 
          hereof and thereof will not constitute a breach or violation of or 
          default under any trust, indenture, agreement or other instrument 
          to which any of the Selling Shareholders is a party or by which any 
          of the Selling Shareholders is bound;

                                       22

<PAGE>

          (xxvi)  the Attorney-in-Fact has been duly authorized by each 
          Selling Shareholder to execute and deliver on behalf of each 
          Selling Shareholder this Agreement and any other document necessary 
          or desirable in connection with the transactions contemplated 
          hereby and to deliver the Shares to be sold by the Selling 
          Shareholders and receive payment therefor pursuant hereto;

         (xxvii)  no approval, authorization, consent or order of or filing 
          with any federal, state, local or foreign governmental or 
          regulatory commission, board, body, authority or agency is required 
          in connection with the sale of the Shares to be sold by the Selling 
          Shareholders as contemplated hereby other than registration of the 
          Shares under the Act (except such counsel need express no opinion 
          as to any necessary qualification under the state securities or 
          blue sky laws of the various jurisdictions in which the Shares are 
          being offered by the Underwriters); and

          (xxviii)  nothing has come to the attention of such counsel that 
          causes them to believe that the Registration Statement or any 
          amendment thereto at the time such Registration Statement or 
          amendment became effective contained an untrue statement of a 
          material fact or omitted to state a material fact required to be 
          stated therein or necessary to make the statements therein not 
          misleading, or that the Prospectus or any supplement thereto at the 
          date of such Prospectus or such supplement, and at all times up to 
          and including the time of purchase contained an untrue statement of 
          a material fact or omitted to state a material fact required to be 
          stated therein or necessary to make the statements therein, in 
          light of the circumstances under which they were made, not 
          misleading (it being understood that such counsel need express no 
          opinion with respect to the financial statements and schedules 
          included in the Registration Statement or Prospectus).

          (b)  You shall have received from Ernst & Young LLP letters dated, 
     respectively, the date of this Agreement and the time of purchase and 
     additional time of purchase, as the case may be, and addressed to the 
     Underwriters (with reproduced copies for each of the Underwriters) in 
     form and substance satisfactory to you.

                                       23

<PAGE>

          (c)  You shall have received at the time of purchase and at the 
     additional time of purchase, as the case may be, opinions from Gibson, 
     Dunn & Crutcher LLP in form and substance satisfactory to you.

          (d)  No amendment or supplement to the Registration Statement or the
     Prospectus, including documents deemed to be incorporated by reference
     therein, shall be filed prior to the time the Registration Statement
     becomes effective to which you shall have objected in writing.

          (e)  The Registration Statement shall become effective at or before
     5:00 P.M., New York City time, on the date of this Agreement and, if
     Rule 430A under the Act is used, the Prospectus shall have been filed with
     the Commission pursuant to Rule 424(b) under the Act at or before
     5:00 P.M., New York City time, on the second full business day after the
     date of this Agreement; PROVIDED, HOWEVER, that the Company, the Selling
     Shareholders and you and any group of Underwriters, including you, who have
     agreed hereunder to purchase in the aggregate at least 50% of the Firm
     Shares from time to time may agree in writing or by telephone, confirmed in
     writing, on a later date.

          (f)  Prior to the time of purchase or the additional time of purchase,
     as the case may be:  (i) no stop order with respect to the effectiveness of
     the Registration Statement shall have been issued under the Act or
     proceedings initiated under Section 8(d) or 8(e) of the Act; (ii) the
     Registration Statement and all amendments thereto, or modifications
     thereof, if any, shall not contain an untrue statement of a material fact
     or omit to state a material fact required to be stated therein or necessary
     to make the statements therein not misleading; and (iii) the Prospectus and
     all amendments or supplements thereto, or modifications thereof, if any,
     shall not contain an untrue statement of a material fact or omit to state a
     material fact required to be stated therein or necessary to make the
     statements therein, in light of the circumstances under which they were
     made, not misleading.

          (g)  Between the time of execution of this Agreement and the time of
     purchase or the additional time of purchase, as the case may be, there has
     not been:  (i) any material and adverse change, present or prospective, in
     the properties, assets, operations, business, business prospects or
     condition (financial or other) of the Company and the Subsidiaries taken as
     a 

                                       24

<PAGE>

     whole, other than as described in the Registration Statement and the 
     Prospectus; (ii) any transaction that is material to the Company and the 
     Subsidiaries taken as a whole contemplated or entered into by the 
     Company or any of the Subsidiaries, other than as described in the 
     Registration Statement and the Prospectus; or (iii) any obligation, 
     contingent or otherwise, directly or indirectly, incurred by the Company 
     or any of the Subsidiaries that is material to the Company and the 
     Subsidiaries taken as a whole, other than as described in the 
     Registration Statement and the Prospectus.

          (h)  The Company, at the time of purchase or additional time of
     purchase, as the case may be, will deliver to you a certificate of two of
     its executive officers to the effect that the representations and
     warranties of the Company as set forth in this Agreement are true and
     correct as of each such date and the conditions set forth in Section 8(f)
     and Section 8(g) have been met.

          (i)  You shall have received a signed letter, dated the date of this
     Agreement, from each of the shareholders listed in Schedule C to the effect
     that such persons shall not sell, contract to sell, grant any option to
     sell, transfer or otherwise dispose of, directly or indirectly, any shares
     of Common Stock or securities convertible into or exchangeable for Common
     Stock or warrants or other rights to purchase Common Stock for a period of
     90 days from the date of the Prospectus without the prior written consent
     of Warburg Dillon Read LLC.

          (j)  The Company and the Selling Shareholders shall have furnished to
     you such other documents and certificates as to the accuracy and
     completeness of any statement in the Registration Statement or the
     Prospectus as of the time of purchase and the additional time of purchase,
     as the case may be, as you reasonably may request.

          (k)  The Company and the Selling Shareholders shall have performed
     such of their respective obligations under this Agreement as are to be
     performed by the terms hereof at or before the time of purchase and at or
     before the additional time of purchase, as the case may be.

          (l)  The Shares shall have been approved for listing on the New York
     Stock Exchange.

                                       25

<PAGE>

          (m)  The Attorney-in-Fact, at the time of purchase or additional time
     of purchase, as the case may be, shall have delivered to you a certificate
     to the effect that the Attorney-in-Fact is not aware that any of the
     representations and warranties of the Selling Shareholders as set forth in
     this Agreement are not true and correct as of such date.

          (n)  On or prior to the date hereof, the New York Stock Exchange shall
     have approved the Underwriters' participation in the distribution of the
     Shares to be sold by the Selling Shareholders.

          9.   EFFECTIVE DATE OF AGREEMENT; TERMINATION.

          (a)  This Agreement shall become effective (i) if Rule 430A under 
the Act is not used, when you shall have received notification of the 
effectiveness of the Registration Statement, or (ii) if Rule 430A under the 
Act is used, when the parties hereto have executed and delivered this 
Agreement.

          (b)  The obligations of the several Underwriters hereunder shall be 
subject to termination in the absolute discretion of you or any group of 
Underwriters (which may include you) which has agreed to purchase in the 
aggregate at least 50% of the Firm Shares if, at any time prior to the time 
of purchase or, with respect to the purchase of any Additional Shares, the 
additional time of purchase, as the case may be, trading in securities on the 
New York Stock Exchange shall have been suspended or minimum prices shall 
have been established on the New York Stock Exchange or if a banking 
moratorium shall have been declared either by the United States or New York 
State authorities, or if the United States shall have declared war in 
accordance with its constitutional processes or there shall have occurred any 
material outbreak or escalation of hostilities or other national or 
international calamity or crisis of such magnitude in its effect on, or any 
material adverse change in, any financial market which, in each case, in your 
judgment or in the judgment of such group of Underwriters, makes it 
impracticable to market the Shares.  If you or any group of Underwriters 
elect to terminate this Agreement as provided in this Section 9(b), the 
Company and each other Underwriter shall be notified promptly by letter or 
telegram.

          (c)  If any Underwriter shall default in its obligation to take up 
and pay for the Firm Shares to be purchased by it hereunder and if the number 
of Firm Shares which all Underwriters so defaulting shall have agreed but 
failed to take up and pay for does not exceed 10% of the 

                                       26

<PAGE>

total number of Firm Shares, the non-defaulting Underwriters shall take up 
and pay for (in addition to the aggregate principal amount of Firm Shares 
they are obligated to purchase pursuant to Section 1) the number of Firm 
Shares agreed to be purchased by all such defaulting Underwriters as 
hereinafter provided.  Such Shares shall be taken up and paid for by such 
non-defaulting Underwriter or Underwriters in such amount or amounts as you 
may designate with the consent of each Underwriter so designated or, in the 
event no such designation is made, such Shares shall be taken up and paid for 
by all non-defaulting Underwriters pro rata in proportion to the aggregate 
number of Firm Shares set opposite the names of such non-defaulting 
Underwriters in Schedule A.

          (d)  If any Underwriter shall default in its obligation to take up 
and pay for the Firm Shares to be purchased by it hereunder and if the number 
of Firm Shares which all Underwriters so defaulting shall have agreed but 
failed to take up and pay for exceeds 10% of the total number of Firm Shares, 
and arrangements satisfactory to you and the Company are not made within 48 
hours after such default, this Agreement will terminate without liability on 
the part of any non-defaulting Underwriter.

          (e)  Without relieving any defaulting Underwriter from its 
obligations hereunder, the Company agrees with the non-defaulting 
Underwriters that it will not sell any Firm Shares hereunder unless all of 
the Firm Shares are purchased by the Underwriters (or by substituted 
underwriters selected by you with the approval of the Company or selected by 
the Company with your approval pursuant to Section 9(d)).  If a new 
Underwriter or Underwriters are substituted for a defaulting Underwriter or 
Underwriters in accordance with Section 9(d), the Company or you shall have 
the right to postpone the time of purchase for a period not exceeding five 
business days in order that any necessary change in the Registration 
Statement and the Prospectus and other documents may be effected.  The term 
Underwriter as used in this Agreement shall refer to and include any 
Underwriter substituted under this Section 9 with like effect as if such 
substituted Underwriter had originally been named in Schedule A.

          (f)  If the purchase of the Shares by the Underwriters, as 
contemplated by this Agreement, is not consummated for any reason permitted 
under this Agreement or if such purchase is not consummated because the 
Company shall be unable to comply with any of the terms of this Agreement, 
the Company shall not be under any obligation or liability under this 
Agreement (except to the extent provided in Sections 5(l), 7 and 10), and the 
Underwriters 

                                       27

<PAGE>

shall be under no obligation or liability to the Company under this Agreement 
(except to the extent provided in Section 10).

          10.  INDEMNITY BY THE COMPANY, THE SELLING SHAREHOLDERS AND THE 
UNDERWRITERS.

          (a)  The Company and the Selling Shareholders, jointly and 
severally, agree to indemnify, defend and hold harmless each Underwriter, 
each person that controls any Underwriter within the meaning of Section 15 of 
the Act or Section 20 of the Exchange Act, and each Underwriter's agents, 
employees, officers and directors and the agents, employees, officers and 
directors of any such controlling person (collectively, the "Underwriter 
indemnified parties") from and against any and all losses, claims, damages, 
judgments, liabilities and expenses (including the fees and expenses of 
counsel and other expenses in connection with investigating, defending or 
settling any such action or claim) which, jointly or severally, any 
Underwriter indemnified party may incur as they are incurred (and regardless 
of whether such Underwriter indemnified party is a party to the litigation, 
if any) arising out of or based upon any untrue statement or alleged untrue 
statement of a material fact contained in the registration statement relating 
to the Shares or the Prospectus or any Preliminary Prospectus, or arising out 
of or based upon any omission or alleged omission to state therein a material 
fact required to be stated therein or necessary to make the statements 
therein not misleading, except insofar as such losses, claims, damages, 
judgments, liabilities or expenses arise out of, or are based upon, any such 
untrue statement or omission or alleged untrue statement or omission based 
upon and in conformity with information with respect to any Underwriter 
furnished in writing by any Underwriter through you to the Company expressly 
for use therein with reference to such Underwriter; PROVIDED, HOWEVER, that 
no Selling Shareholder shall be liable under this Section 11 in an amount 
exceeding the total price at which the Shares sold by such Selling 
Shareholder were offered to the public.  This indemnity agreement will be in 
addition to any liability the Company or the Selling Shareholders otherwise 
may have.

          (b)  If any action or proceeding (including any governmental or 
regulatory investigation or proceeding) shall be brought or asserted against 
any Underwriter indemnified party, with respect to which indemnity may be 
sought against the Company or a Selling Shareholder pursuant to this Section 
10, such Underwriter indemnified party shall promptly notify the Company and 
each Selling Shareholder in writing, and the Company and the Selling 
Shareholders shall assume the defense thereof, including the employment of 

                                       28

<PAGE>

counsel reasonably satisfactory to the Underwriter indemnified party and 
payment of all fees and expenses; PROVIDED that the omission so to notify the 
Company and the Selling Shareholders shall not relieve them from any 
liability that they may have to any Underwriter indemnified party.  An 
Underwriter indemnified party shall have the right to employ separate counsel 
in any such action or proceeding and to assume the defense thereof, but the 
fees and expenses of such counsel shall be at the expense of such Underwriter 
indemnified party unless (i) the employment of such counsel has been 
authorized in writing by the Company or the Selling Shareholders, (ii) the 
Company and the Selling Shareholders have failed promptly to assume the 
defense and employ counsel satisfactory to the Underwriter indemnified party 
or (iii) the named parties to any such action or proceeding (including any 
impleaded parties) include both the Underwriter indemnified party and the 
Company or the Selling Shareholders and such Underwriter indemnified party 
shall have reasonably concluded that there may be one or more legal defenses 
available to it that are different from or additional to those available to 
the Company and the Selling Shareholders (in which case the Company and the 
Selling Shareholders shall not have the right to assume the defense of such 
action on behalf of such Underwriter indemnified party), in any of which 
events such fees and expenses shall be borne by the Company and the Selling 
Shareholders and reimbursed as they are incurred.  It is understood, however, 
that the Company and the Selling Shareholders shall not, in connection with 
any one such action or separate but substantially similar or related actions 
in the same jurisdiction arising out of the same general allegations or 
circumstances, be liable for the fees and expenses of more than one separate 
firm of attorneys (in addition to any local counsel) at any time for all such 
Underwriter indemnified parties, which firm shall be designated in writing by 
Warburg Dillon Read LLC, and that all such fees and expenses shall be 
reimbursed as they are incurred.  The Company and the Selling Shareholders 
shall not be liable for any settlement of any such action effected without 
the written consent of the Company or the Selling Shareholders (which consent 
shall not be unreasonably withheld or delayed), but if settled with the 
written consent of the Company or the Selling Shareholders], or if there is a 
final judgment with respect thereto, the Company and the Selling Shareholders 
agree to indemnify and hold harmless each Underwriter indemnified party from 
and against any loss or liability by reason of such settlement or judgment.

          (c)  Each Underwriter severally agrees to indemnify and hold 
harmless the Company, its directors, its officers who sign the Registration 
Statement, and any person 

                                       29

<PAGE>

that controls the Company within the meaning of Section 15 of the Act or 
Section 20 of the Exchange Act (collectively, the "Company indemnified 
parties") and each Selling Shareholder to the same extent as the foregoing 
indemnity from the Company and the Selling Shareholders to the Underwriter 
indemnified parties, but only with respect to information concerning such 
Underwriter furnished in writing by or on behalf of such Underwriter through 
you to the Company expressly for use with respect to such Underwriter in the 
Registration Statement, any Preliminary Prospectus or the Prospectus.  In 
case any action shall be brought against any Company indemnified party or any 
Selling Shareholder based on the Registration Statement, any Preliminary 
Prospectus or the Prospectus and in respect of which indemnity may be sought 
against any Underwriter pursuant to this Section 10(c), such Underwriter 
shall have the rights and duties given to the Company and the Selling 
Shareholders by Section 10(b) (except that if the Company and the Selling 
Shareholders shall have assumed the defense thereof such Underwriter shall 
not be required to do so, but may employ separate counsel therein and 
participate in the defense thereof, PROVIDED that the fees and expenses of 
such separate counsel shall be at the expense of such Underwriter), and the 
Company indemnified parties and the Selling Shareholders shall have the 
rights and duties given to the Underwriter indemnified parties by Section 
10(b).

          (d)  If the indemnification provided for in this Section 10 is 
unavailable to or insufficient to hold harmless any Underwriter indemnified 
party or any Company indemnified party or any Selling Shareholder, then the 
party required to indemnify such indemnified party under this Section 10, in 
lieu of indemnifying such indemnified party, shall contribute to the amount 
paid or payable by such indemnified party as a result of such losses, claims, 
damages, judgments, liabilities and expenses (i) in such proportion as is 
appropriate to reflect the relative benefits received by the Company and the 
Selling Shareholders on the one hand and the Underwriters on the other hand 
from the offering of the Shares, or (ii) if the allocation provided by clause 
(i) above is not permitted by applicable law, in such proportion as is 
appropriate to reflect not only the relative benefits referred to in clause 
(i) above but also the relative fault of the Company and the Selling 
Shareholders on the one hand and the Underwriters on the other hand in 
connection with the statements or omissions which resulted in such losses, 
claims, damages, liabilities or expenses, as well as any other relevant 
equitable considerations.  The relative benefits received by the Company and 
the Selling Shareholders on the one hand and the Underwriters on the other 
hand shall be deemed to be in the same proportion as 

                                       30

<PAGE>

the total proceeds from the offering (net of underwriting discounts and 
commissions but before deducting expenses) received by the Company and the 
Selling Shareholders bear to the total underwriting discounts and commissions 
received by the Underwriters, in each case as set forth in the table on the 
cover page of the Prospectus.  The relative fault of the Company and the 
Selling Shareholders on the one hand and the Underwriters on the other hand 
shall be determined by reference to, among other things, whether the untrue 
statement or alleged untrue statement of a material fact or the omission or 
alleged omission to state a material fact relates to information supplied by 
the Company, by the Selling Shareholders or by the Underwriters, and the 
parties' relative intent, knowledge, access to information and opportunity to 
correct or prevent such statement or omission.  The amount paid or payable by 
a party as a result of the losses, claims, damages, judgments, liabilities 
and expenses referred to above shall be deemed to include any legal or other 
fees or expenses reasonably incurred by such party in connection with 
investigating or defending any claim or action.

          The Company, the Selling Shareholders and the Underwriters agree 
that it would not be just and equitable if contribution pursuant to this 
Section 10(d) were determined by pro rata allocation or by any other method 
of allocation (even if the Underwriters were treated as one entity for such 
purpose) that does not take account of the equitable considerations referred 
to in this Section 10(d).  Notwithstanding the provisions of this Section 
10(d), no Underwriter indemnified party shall be required to contribute any 
amount in excess of the amount by which the total price at which the Shares 
underwritten by such Underwriter indemnified party and distributed to the 
public were offered to the public exceeds the amount of any damages which 
such Underwriter indemnified party otherwise has been required to pay by 
reason of such untrue statement or alleged untrue statement or omission or 
alleged omission.  No person guilty of fraudulent misrepresentation (within 
the meaning of Section 11(f) of the Act) shall be entitled to contribution 
from any person who was not guilty of such fraudulent misrepresentation.  The 
Underwriters' obligations to contribute pursuant to this Section 10 are 
several in proportion to their respective underwriting commitments and are 
not joint.

          The statements under the caption "Underwriting" in the Prospectus 
(to the extent such statements relate to an Underwriter) constitute the only 
information furnished to the Company in writing by such Underwriter expressly 
for use in the Registration Statement, any Preliminary Prospectus or the 
Prospectus.

                                       31

<PAGE>

          (e)  The indemnity and contribution agreements contained in this 
Section 10 and the representations, warranties and covenants of the Company 
and the Selling Shareholders contained in this Agreement shall remain in full 
force and effect, regardless of any investigation made by or on behalf of any 
Underwriter indemnified party or by or on behalf of any Company indemnified 
party or any Selling Shareholder, and shall survive any termination of this 
Agreement or the issuance and delivery of the Shares.  Subject to the 
provisions of Section 10(b) and Section 10(c), the Company, each Selling 
Shareholder and each Underwriter agree promptly to notify the other of the 
commencement of any litigation or proceeding against it in connection with 
the issuance and sale of the Shares or in connection with the Registration 
Statement or the Prospectus.

          11.  NOTICES.  Except as otherwise herein provided, all statements, 
requests, notices and agreements shall be in writing or by telegram and, if 
to the Underwriters, shall be sufficient in all respects if delivered or sent 
to Warburg Dillon Read LLC, 535 Madison Avenue, New York, New York 10022, 
Attention:  Syndicate Department; if to the Company, shall be sufficient in 
all respects if delivered or sent to the Company at the offices of the 
Company at 7301 Fairview, Houston, Texas, 77041, Attention: ____________; and 
if to the Selling Shareholders, shall be sufficient in all respects, if 
delivered or sent to ____________.

          12.  CONSTRUCTION.  THIS AGREEMENT SHALL BE GOVERNED BY, AND 
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT 
REGARD TO PRINCIPLES OF CONFLICTS OF LAW.  THE SECTION HEADINGS IN THIS 
AGREEMENT HAVE BEEN INSERTED AS A MATTER OF CONVENIENCE OF REFERENCE AND ARE 
NOT A PART OF THIS AGREEMENT.

          13.  PARTIES AT INTEREST.  The Agreement herein set forth has been 
and is made solely for the benefit of the Underwriters, the Company, the 
Selling Shareholders, the Underwriter indemnified parties and the Company 
indemnified parties, and their respective successors, assigns, executors and 
administrators. No other person, partnership, association or corporation 
(including a purchaser, as such purchaser, from any of the Underwriters) 
shall acquire or have any right under or by virtue of this Agreement.

          14.  COUNTERPARTS.  This Agreement may be signed by the parties in 
counterparts which together shall constitute one and the same agreement among 
the parties.

                                       32

<PAGE>

          If the foregoing correctly sets forth the understanding among the 
Company, the Selling Shareholders and the Underwriters, please so indicate in 
the space provided below for such purpose, whereupon this letter and your 
acceptance shall constitute a binding agreement among the Company, the 
Selling Shareholders and the Underwriters, severally.


                                       Very truly yours,

                                       NCI BUILDING SYSTEMS, INC.

                                       By: 
                                          -------------------------------------
                                       Name:
                                       Title:

                                       THE SELLING SHAREHOLDERS NAMED 
                                         IN SCHEDULE B ATTACHED HERETO


                                       By: 
                                          -------------------------------------
                                            Attorney-in-fact

Accepted and agreed to as of
the date first above written,
on behalf of themselves,
J.C. Bradford & Co.,
Wheat First Union, Dain
Rauscher Wessels
and the other several
Underwriters named in
Schedule A

WARBURG DILLON READ LLC, as

  Managing Underwriter

By: 
   -------------------------------------
Name: 
Title:

                                       33

<PAGE>

                                     SCHEDULE A
<TABLE>
<CAPTION>
                                                  Number of 
Underwriter                                      Firm Shares
- -----------                                      -----------
<S>                                              <C>
Warburg Dillon Read LLC . . . . . . . . . . .              
J.C. Bradford & Co. . . . . . . . . . . . . .              
Wheat First Union . . . . . . . . . . . . . .              
Dain Rauscher Wessels . . . . . . . . . . . .              




                                                 ----------
Total          
                                                 ----------
                                                 ----------
</TABLE>

<PAGE>

                                     SCHEDULE B

<TABLE>
<CAPTION>
                                                     Number of Firm 
Name                                               Shares to be Sold
- ----                                               -----------------
<S>                                                <C>

</TABLE>

<PAGE>

                                     SCHEDULE C

                 SHAREHOLDERS WHO HAVE EXECUTED LOCK-UP AGREEMENTS 




<PAGE>

DAVIDS 7-31-98                                             TM  ETHER 28  H-57939


           INCORPORATED UNDER THE LAWS              COMMON STOCK  
            OF THE STATE OF DELAWARE               PAR VALUE $.01 

NUMBER                                                                   SHARES
NCI

         THIS CERTIFICATE IS TRANSFERABLE             CUSIP 628852 10 5         
         IN NEW YORK, NY AND CHICAGO, IL     SEE REVERSE FOR CERTAIN DEFINITIONS


                          NCI BUILDING SYSTEMS, INC.

THIS CERTIFIES THAT




IS THE OWNER OF

            FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK OF

                     C E R T I F I C A T E  O F  S T O C K

NCI BUILDING SYSTEMS, INC. TRANSFERABLE ON THE BOOKS OF THE CORPORATION BY 
THE HOLDER HEREOF IN PERSON OR BY DULY AUTHORIZED ATTORNEY UPON SURRENDER OF 
THIS CERTIFICATE PROPERLY ENDORSED. THIS CERTIFICATE IS NOT VALID UNLESS 
COUNTERSIGNED AND REGISTERED BY THE TRANSFER AGENT AND REGISTRAR.

     WITNESS THE FACSIMILE SEAL OF THE CORPORATION AND THE FACSIMILE 
SIGNATURES OF ITS DULY AUTHORIZED OFFICERS.

                                                      NCI BUILDING SYSTEMS, INC.
       [NCI LOGO]                                               [SEAL]
American Bank Note Company                                    CORPORATE
                                                               DELAWARE

                                       DATED
                  /s/ JOHNNIE SCHULTE
PRESIDENT AND CHIEF EXECUTIVE OFFICER

                                       COUNTERSIGNED AND REGISTERED:
                                            HARRIS TRUST AND SAVINGS BANK     
                                                                 TRANSFER AGENT
                                                                  AND REGISTRAR

                                       BY

         /s/ DONNIE R. HUMPHRIES
                       SECRETARY                           AUTHORIZED SIGNATURE


<PAGE>

                          NCI BUILDING SYSTEMS, INC.

     The Company will furnish upon request and without charge to each 
stockholder the powers, designations, preferences and relative, 
participating, optional and other special rights of each class of stock and 
series within a class of stock of the Company, as well as the qualifications, 
limitations and restrictions relating to those preferences and/or rights.  A 
stockholder may make the request to the Company or to its Transfer Agent and 
Registrar.

     The following abbreviations, when used in the inscription on the face of 
this certificate, shall be construed as though they were written out in full 
according to applicable laws or regulations:

TEN COM - as tenants in common         UNIF GIFT MIN ACT-______Custodian________
TEN ENT - as tenants by the entireties                   (Cust)         (Minor) 
JT TEN  - as joint tenants with right           under Uniform Gifts to Minors   
          of survivorship and not as tenants    Act _________________________   
          in common                                         (State)             

    Additional abbreviations may also be used though not in the above list.   

     For value received, _______________________ hereby sell, assign and 
transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
- --------------------------------------

- -------------------------------------------------------------------------------
PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF 
ASSIGNEE

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

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

- --------------------------------------------------------------------------SHARES
OF THE CAPITAL STOCK REPRESENTED BY THE WITHIN CERTIFICATE, AND DO HEREBY 
IRREVOCABLY CONSTITUTE AND APPOINT
                                  ---------------------------------------------

- -------------------------------------------------------------------------------
ATTORNEY TO TRANSFER THE SAID STOCK ON THE BOOKS OF THE COMPANY WITH FULL 
POWER OF SUBSTITUTION IN THE PREMISES.

DATED
     ---------------------------------

                                       X
                                        ---------------------------------------
                                                     (SIGNATURE)

              NOTICE:                  X                                      
                                        ------------------------------------- 
                                                       (SIGNATURE)            
                                                                              
THE SIGNATURE(S) TO THIS ASSIGNMENT     --------------------------------------
MUST CORRESPOND WITH THE NAME(S) AS     THE SIGNATURE(S) SHOULD BE GUARANTEED 
WRITTEN UPON THE FACE OF THE            BY AN ELIGIBLE GUARANTOR INSTITUTION  
CERTIFICATE IN EVERY PARTICULAR         (BANKS, STOCKBROKERS, SAVINGS AND     
WITHOUT ALTERATION OR ENLARGEMENT OR    LOAN ASSOCIATIONS AND CREDIT UNIONS   
ANY CHANGE WHATEVER.                    WITH MEMBERSHIP IN AN APPROVED        
                                        SIGNATURE GUARANTEE MEDALLION         
                                        PROGRAM), PURSUANT TO S.E.C. RULE     
                                        17Ad-15.                              
                                        --------------------------------------
                                        SIGNATURE(S) GUARANTEED BY:           
This certificate also evidences and                                           
entitles the holder hereof to certain                                         
Rights as set forth in the Rights       --------------------------------------
Agreement between the Corporation and
Harris Trust and Savings Bank, dated 
as of June 24, 1998 (the "Rights     
Agreement"), the terms of which are  
incorporated herein and a copy of    
which is on file at the principal    
offices of the Corporation.  Under   
certain circumstances, as set forth  
in the Rights Agreement, such Rights 
will be evidenced by separate        
certificates and will no longer be   
evidenced by this certificate.  
Promptly after receipt of a written 
request therefor, the Corporation 
will mail or cause to be mailed to 
the holder of this certificate a copy 
of the Rights Agreement without 
charge.  Under certain circumstances, 
Rights issued to, or held by, 
Acquiring Persons or Affiliates or 
Associates thereof (as such terms as 
defined in the Rights Agreement) and 
any subsequent holder of such Rights 
may become null and void.



<PAGE>




214-999-3000

September 1, 1998

NCI Building Systems, Inc.
7301 Fairview
Houston, Texas 77041

Gentlemen:

     We have served as counsel for NCI Building Systems, Inc., a Delaware 
corporation (the "Company"), and certain stockholders of the Company (the 
"Selling Stockholders") in connection with the Registration Statement on Form 
S-3, No. 333-60829 (the "Registration Statement"), filed with the Securities 
and Exchange Commission under the Securities Act of 1933, as amended, 
covering the proposed public offering of 3,500,000 shares of common stock, 
$0.01 par value ("Common Stock"), of the Company to be issued and sold by the 
Company (the "Company Shares"), 300,000 shares of Common Stock to be sold by 
the Selling Stockholders (the "Selling Stockholder Shares") and, subject to 
the exercise of an over-allotment option granted by the Company and/or 
certain of the Selling Stockholders, not to exceed an aggregate of 570,000 
shares of Common Stock, consisting of up to an additional 570,000 shares to 
be issued and sold by the Company (the "Additional Shares") and up to an 
additional 150,000 shares to be issued and sold by certain of the Selling 
Stockholders (the "Selling Stockholder Additional Shares").

     With respect to the foregoing, we have examined such documents and 
questions of law as we have deemed necessary to render the opinion expressed 
below.  Based upon the foregoing, we are of the opinion that:

     1.    The Company Shares and the Additional Shares, when issued, sold 
and delivered in the manner and for the consideration stated in the 
Prospectus (the "Prospectus") constituting a part of the Registration 
Statement and in the Underwriting Agreement described in the Registration 
Statement, will be duly authorized, validly issued, fully paid and 
nonassessable.

     2.    Selling Stockholder Shares and the Selling Stockholder Additional 
Shares (a) if now outstanding, are duly authorized, validly issued, fully 
paid and nonassessable or (b) if not now outstanding, will be when sold, 
issued and delivered upon notice of exercise of options granted to the 
respective Selling Stockholders of the Company in the manner and for the 
consideration set forth in the Stock Option Agreement between the Company and 
the Selling Stockholder, duly authorized, validly issued, fully paid and 
nonassessable.

     We consent to the use of this opinion as Exhibit 5.1 to the Registration 
Statement and further consent to the use of our name in the Registration 
Statement and the Prospectus under the heading "Legal Matters."


                                       Very truly yours,


                                       GARDERE & WYNNE, L.L.P.


                                       By: /s/ Randall G. Ray
                                           ------------------------------------
                                           Randall G. Ray, Partner



<PAGE>

                                                                   Exhibit 23.1


                          CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" in the 
Registration Statement (Form S-3) and related Prospectus of NCI Building 
Systems, Inc. for the registration of 3,800,000 shares of its common stock 
and to the use of our report dated December 8, 1997 (except for Note 9, as to
which the date is July 31, 1998), with respect to the consolidated financial 
statements of NCI Building Systems, Inc. for the year ended October 31, 1997, 
and of our report dated August 5, 1998, with respect to the consolidated 
financial statements of Amatek Holdings, Inc. for the year ended December 31, 
1997, included in the Registration Statement on Form S-3.


                                       /s/ ERNST & YOUNG LLP
                                       -------------------------------
                                       ERNST & YOUNG LLP


Houston, Texas
September 1, 1998




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