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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                   FORM 10-K
 
 (MARK
  ONE)
  /X/    Annual Report pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934 for the fiscal year ended December 31, 1998.
                                        or
  / /    Transition Report pursuant to Section 13 or 15(d) of the
         Securities Exchange Act of 1934 (No Fee Required) for the
         transition period from to .
 
                     Commission File Number 333-20095
 
                         ------------------------
 
                          ATRIUM COMPANIES, INC.
          (Exact name of Registrant as specified in its charter)
 
                         ------------------------
 
<TABLE>
<S>                                             <C>
                   DELAWARE                                       75-2642488
       (State or other jurisdiction of                          (IRS Employer
        incorporation or organization)                      Identification Number)
 
                            1341 W. MOCKINGBIRD LANE, SUITE 1200W
                                     DALLAS, TEXAS 75247
                      (Address of executive offices, including zip code)
                                        (214) 630-5757
                     (Registrant's telephone number, including area code)
</TABLE>
 
Securities registered pursuant to Section 12(b) and (g) of the Act: NONE
 
Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes /X/ No / /
 
State the aggregate market value of the voting stock held by non-affiliates of
the registrant--NONE
 
Indicate by check mark if disclosure of delinquent filers pursuant to item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. / /
 
    As of April 15, 1999, the registrant had 100 shares of Common Stock, par
value $.01 per share outstanding.
 
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                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
                                 1998 FORM 10-K
 
                               TABLE OF CONTENTS
 
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<CAPTION>
 ITEM NO.                                 DESCRIPTION                                    PAGE
----------  ------------------------------------------------------------------------  -----------
<S>         <C>                                                                       <C>
 
                                             PART I
 
Item 1.     Business................................................................           3
 
Item 2.     Properties..............................................................          12
 
Item 3.     Legal Proceedings.......................................................          12
 
Item 4.     Submission of Matters to a Vote of Security Holders.....................          12
 
                                            PART II
 
Item 5.     Market for Registrant's Common Equity and Related Stockholder Matters...          13
 
Item 6.     Selected Financial Information..........................................          13
 
Item 7.     Management's Discussion and Analysis of Financial Condition and Results
            of Operations...........................................................          14
 
Item 8.     Financial Statements and Supplementary Data.............................          18
 
Item 9.     Changes in and Disagreements with Accountants on Accounting and
            Financial Disclosure....................................................          18
 
                                            PART III
 
Item 10.    Directors and Executive Officers of the Registrant......................          19
 
Item 11.    Executive Compensation..................................................          21
 
Item 12.    Security Ownership of Certain Beneficial Owners and Management..........          27
 
Item 13.    Certain Relationships and Related Transactions..........................          28
 
                                            PART IV
 
Item 14.    Exhibits, Financial Statement Schedules and Reports on Form 8-K.........          31
 
Signatures..........................................................................          32
</TABLE>
 
                                       2
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                                     PART I
 
ITEM 1.  BUSINESS
 
    ALL REFERENCES TO PRO FORMA ASSUMES THAT THE "RECAPITALIZATION" DESCRIBED ON
PAGE 11, IN "SELECTED FINANCIAL DATA" AND "MANAGEMENT'S DISCUSSION AND ANALYSIS
OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS" OCCURRED ON JANUARY 1, 1998
AND THE FINANCIAL DATA IS THAT OF ATRIUM, WING AND DARBY FOR THE ENTIRE YEAR
ENDED DECEMBER 31, 1998.
 
    THE TERM "WING" REFERS TO WING INDUSTRIES, INC. AND ITS DIRECT PARENT, WING
INDUSTRIES HOLDINGS, INC., AS A COMBINED ENTITY AND THE TERM "DARBY" REFERS TO
R.G. DARBY COMPANY, INC., TOTAL TRIM, INC. AND THEIR DIRECT PARENT, DOOR
HOLDINGS, INC., AS A COMBINED ENTITY, WHICH ENTITIES WERE CONTRIBUTED TO OUR
COMPANY AND BECAME OUR SUBSIDIARIES IN CONNECTION WITH THE RECAPITALIZATION OF
ATRIUM IN 1998.
 
THE COMPANY
 
    We are one of the largest manufacturers and distributors of residential
windows and doors in the United States based on 1998 pro forma net sales. We
offer a complete product line including aluminum, vinyl and wood windows and
doors to our customers, which include leading national homebuilders and home
center retailers such as Centex, The Home Depot and Lowe's. We have grown
rapidly through a combination of internal growth and by making complementary
acquisitions.
 
    We were founded in 1948 and have become one of the two largest manufacturers
and suppliers of non-wood windows and the third largest manufacturer and
supplier of doors in the United States, based on 1998 pro forma net sales. Our
portfolio of products includes some of the industry's most recognized brand
names including ATRIUM-Registered Trademark- and WING-Registered Trademark-.
 
    We have 29 manufacturing facilities and distribution centers strategically
located in 14 states to service customers on a nationwide basis. We distribute
through multiple channels including direct distribution to large homebuilders
and independent contractors, one-step distribution through home centers and
lumberyards and two-step distribution to wholesalers and dealers who
subsequently resell to lumberyards, contractors and retailers. We believe that
our multi-channel distribution network allows us to reach the greatest number of
end customers and provide nationwide service to those customers.
 
    Our company is vertically integrated with operations that include:
 
    - The extrusion of aluminum and vinyl, which is utilized internally in our
      fabrication operations or sold to third parties;
 
    - The manufacture and assembly of window and door units, including
      pre-hanging of doors, and sale of such units to wholesalers, lumberyards,
      home centers and homebuilders;
 
    - A turn-key installation program in which we supply and install many of our
      products, including windows and interior and exterior doors; and
 
    - The sale of finished products to homebuilders, remodelers and contractors
      through company-owned distribution centers located across the country.
 
PRODUCTS
 
    We are one of a few window and door manufacturers that offer a diversified
product line that consists of a full range of aluminum, vinyl and wood windows
and patio doors. Our full product line allows us to differentiate ourselves from
our competition, leverage our distribution system and be well-positioned to
benefit from shifts in product preference. As significant regional product
preferences exist among aluminum, vinyl and wood, a full product line is
important to serve a national customer base effectively. We estimate that 55% of
our 1998 pro forma sales were derived from the sale of windows, 40% from the
sale of doors, and approximately 5% from the sale of other products and
services.
 
                                       3
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    WINDOWS.  Our window products include sliders, double hung, and casement
products and are sold under the ATRIUM-Registered Trademark- and HR brand names.
We sell our products primarily to building contractors and lumberyards through
direct and one-step distribution.
 
    The demand for our aluminum, vinyl and wood products vary by region:
 
    - ALUMINUM--Aluminum windows are the product of choice in the southern
      United States due to the regions' warmer weather and more value-conscious
      customers. Aluminum is the most appropriate fenestration material for the
      region because it provides less thermal efficiency at a lower cost than
      either vinyl or wood.
 
    - VINYL--Demand for vinyl windows, particularly in colder climates, has
      significantly increased over the last five years as vinyl windows have
      gained acceptance as a substitute for wood windows. This trend has been
      strengthened as prices for vinyl windows have become more competitive with
      wood products and durability and energy efficiency have improved. We
      entered the vinyl window market in mid-1995 and have increased sales of
      vinyl windows by leveraging the Atrium brand name and our distribution
      channels and through acquisitions.
 
    - WOOD--Wood windows have the highest thermal efficiency and highest cost
      compared to aluminum and vinyl. Accordingly, wood windows are in demand in
      colder regions and in higher end homes. The ATRIUM-Registered Trademark-
      name gained wide recognition in the 1970s and 1980s through the success of
      our line of wood patio doors. In order to capitalize on this success, we
      added a wood window line in 1991 including aluminum-clad and primed wood
      windows and patio doors. We have made the strategic decision to minimize
      our participation in the wood window business as it is concentrated on the
      higher end of our market which is not part of our core focus.
 
    DOORS.  We estimate that our revenues from the sale of doors in 1998,
represented approximately 6% of the total U.S. door market. We estimate that
approximately 85% of our door sales were generated from interior doors and 15%
from exterior doors. Our door products are sold under the ATRIUM-Registered
Trademark-, WING-Registered Trademark- and SUPER MILLWORK-Registered Trademark-
brand names. We sell our products primarily to home center retailers through
one-step distribution.
 
    - INTERIOR DOORS--There are two broad categories of interior doors: bi-fold
      doors and passage doors. Bi-fold doors are hinged folding doors and
      passage doors are the traditional doors used to connect rooms. There are
      also two types of interior wood bi-fold doors and passage doors: solid
      wood doors and hollow core doors. Solid doors are made completely of wood
      while hollow core doors consist of two door facings glued to a wood frame
      and are hollow on the inside. Both solid wood and hollow core passage
      doors are sold one of two ways, either as slabs or as pre-hung units.
      Slabs refer to the door itself and pre-hung units refer to slab doors
      already hinged to a door frame at the factory.
 
    - EXTERIOR DOORS--Our exterior door product offering consists primarily of
      patio doors and pre-hung steel entry doors.
 
    We estimate that 45% of our 1998 door sales were generated from the sale of
pre-hung doors, 30% from solid wood doors, 10% from hollow core doors and 15%
from patio doors. We estimate that 60% of all passage doors sold through home
center retailers are sold as pre-hung units, mainly because of the ease of
installation for the do-it-yourself consumer. We are one of the few
vertically-integrated companies that both manufactures and pre-hangs the doors.
We believe that sales of our pre-hung door line will continue to grow and will
represent a larger portion of our total door sales in the future.
 
    OTHER PRODUCTS AND SERVICES.  We also manufacture and distribute other
products including cafe doors, columns and shutters. We manufacture two types of
cafe doors as well as louvered shutters. The shutters can be used both for
interior and exterior applications. Columns come in many styles and are
purchased from domestic suppliers.
 
                                       4
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    We also offer a turnkey total installation program in which we supply and
install all interior doors, exterior doors, mouldings, locks, hardware, wire
shelving, bath accessories, plate glass mirrors, and toilet partitions. This
concept allows a developer to transfer the risk associated with retaining
reliable work crews and provides protection from cost overruns. We believe that
developers view this as a value added service and are willing to pay a premium
price for it.
 
SALES, MARKETING AND DISTRIBUTION
 
    One of the key components of our marketing strategy is to capitalize on the
complementary nature of our distribution channels. Historically, the majority of
our revenues of window business have been derived from sales to remodelers,
homebuilders, lumberyards and wholesalers, while through our door business we
have targeted principally home center retailers. We plan to broaden our product
offerings principally by selling doors to our traditional window customers and
windows to our traditional door customers.
 
    We have a multi-channel distribution network that includes direct, one-step
and two-step distribution as well as 8 company-owned distribution centers. Our
distribution strategy maximizes our market penetration and reduces reliance upon
any one distribution channel for the sale of our products. Furthermore, as a
manufacturer and distributor of windows and doors for more than four decades, we
have developed long-standing relationships with key distributors in each of our
markets. In each instance, we seek to secure the leading distributors in each
market. If we cannot secure a top-tier distributor in a desired geographic
market, we will consider the acquisition or start up of our own distribution
center in such market.
 
    We also sell windows to major home center retailers and smaller
regional-based retail centers. Although these have become more important to us
because they target the repair and remodeling market, they still accounted for
less than one-fifth of our total window sales in 1998. One of our goals is to
increase our window business' market share in the repair and remodeling market
by capitalizing our door business' strong relationship with home center
retailers.
 
    We utilize the following distribution channels:
 
    - Direct Distribution:  We sell our windows and doors directly to
      contractors, remodelers and other homebuilders without the use of an
      intermediary. By selling directly to builders, we are able to increase our
      gross profits while at the same time offering builders more favorable
      pricing.
 
    - One-Step Distribution:  We sell our finished windows directly to
      lumberyards, building products distributors, home centers, and
      company-owned distribution centers, which will then sell to contractors,
      homebuilders or remodelers. While it is not required that lumberyards or
      building products distributors carry our products on an exclusive basis,
      it is not unusual for them to do so. In addition, they generally purchase
      based on orders, keeping little or no inventory. One-step distribution
      tends to be used most often in metropolitan areas.
 
    - Two-Step Distribution:  Two-step distribution is the selling of completed
      doors and windows to a wholesaler or distributor who then sells the
      products to lumberyards, building products retailers and home centers.
      These intermediaries will in turn sell the windows and doors to the
      homebuilders, homeowners or remodelers. The wholesalers and distributors
      tend to maintain product inventory in order to service the needs of their
      client base for small quantities. Essentially, these middlemen sell to
      customers who do not guarantee sufficient volume to purchase directly from
      us. Two-step distribution is more common in rural areas since urban areas
      are serviced by home centers and large lumberyards.
 
    - Company-Owned Distribution Centers:  We maintain company-owned
      distribution facilities in key markets where available independent
      distributors are weak or where we have been unable to make adequate
      arrangements with existing distributors. Company-owned distribution
      centers essentially act as one-step distributors.
 
                                       5
<PAGE>
    To enhance our market coverage and leverage our considerable brand equity,
we currently market our windows and patio doors under primarily two brand names,
ATRIUM-REGISTERED TRADEMARK- and H-R WINDOWS. Due to the fact that we enjoy such
significant national name recognition at both the building trade and consumer
levels, we decided to bring the product lines of almost all our other brands
under the ATRIUM-REGISTERED TRADEMARK- name. We have now completed rolling our
SKOTTY and BISHOP product lines, as well as those from the Gentek acquisition in
1997, into the ATRIUM-REGISTERED TRADEMARK- brand. We expect to extend the
ATRIUM-REGISTERED TRADEMARK- brand to other products, as well as to appropriate
product lines acquired in the future.
 
    WINDOWS.  We market our window products through a sales force consisting of
approximately 75 company salaried and commissioned sales representatives and
approximately 100 independent commissioned sales representatives. Each of our
divisions is supported by a sales manager, direct sales representatives and
independent representatives. The sales managers coordinate marketing activities
among both company and independent representatives. Our sales representatives
focus primarily on direct sales to homebuilders, remodelers and contractors,
while independent sales representatives sell to home centers, lumberyards and
wholesalers. In general, independent sales representatives carry our window and
door products on an exclusive basis, although they may carry other building
products from other manufacturers.
 
    Our full product line has also been an asset to our sales force, especially
when we are exploring a new distribution channel opportunity. Window
distributors have come to recognize us as a WINDOW supplier, as opposed to an
ALUMINUM window supplier or a VINYL window supplier. The distributors frequently
do not buy the whole range of products since regional tastes vary and
distributors tend to work according to regions. However, these distributors
value our ability to provide these products should they ever demand them.
 
    We believe that customer service plays a key role in the marketing process.
On-time delivery of products, order fill rate, consistency of service and
flexibility in meeting changing customer requirements have made it possible for
us to build a large and loyal customer base that includes companies such as
Centex Homes, one of the nation's largest home-builders, and The Home Depot, the
nation's largest home center retailer.
 
    DOORS.  Our marketing strategy centers primarily on the fact that we can
supply home center retailers with our own complete line of wood doors. We are
the only company in the industry that is able to provide this convenience. The
"one-stop shopping" we provide enables retailers to reduce their transaction
costs, as they have to pay only one invoice, work with one sales representative,
and schedule the receipt of goods with only one company. Our goal is to be the
"preferred supplier" for the door aisle of home center retailers.
 
    Our pricing/product offering strategy focuses on offering the end consumer
lower price points without sacrificing profit margins. We have executed this
strategy in two steps. First, we have consolidated the current product offerings
in order to simplify the overall offering and reduce inventory levels. Second,
on the remaining product offerings, we offer good, better and best products to
the market. Certain of the products in the offering have been redesigned (with
particular emphasis on taking costs out of the products) in order to have an
offering with three distinct price points. This promotes more "trading up" to
our higher quality products by the customer and displays a complete product
line.
 
    For door sales we use an internal sales force consisting of seven people. In
addition, senior executives are actively involved with both sales and customer
service. This group is segregated between national and regional accounts.
Approximately 80% of our door business sales are made to national retail home
center chains. The internal sales force was realigned in early 1995 reducing the
sales staff from 18 to 7 while increasing the number of merchandise managers. As
a result, we have a smaller, more focused sales force which is better structured
to give the home centers the attention required at the store level.
 
    To assist the sales force and provide better service to its customers, we
have over 20 merchandising managers. The merchandising managers provide home
center retailers with in-store services such as
 
                                       6
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product knowledge seminars, store product resets (to straighten stock and fix
displays), sales analysis and in-store merchandising. They also work with the
retailers to resolve claims issues and to handle product returns. This is a
significant advantage to us, as it is a level of service very few suppliers can
offer.
 
    Promotional efforts are focused on the home center industry and its
customers. Cooperative advertising programs are offered to certain of our major
customers, giving us exposure in our customers' local media (e.g., newspaper,
radio, television) in order to generate sales at individual locations. We also
invest in in-store displays showing operating door units and photographs of
in-room settings in order to generate sales once customers are in the stores.
Product knowledge classes are frequently held to inform store employees about
the features and benefits of each product. Award winning packaging and in-store
signage are used to further general awareness within the stores. We also offer
retailers a video showing how quickly a homeowner can install a bi-fold door
using only basic hand tools.
 
OPERATIONS
 
    We manufacture and sell our windows through a vertically integrated process
that includes extrusion, fabrication and distribution. We realize many
operational and cost benefits from our vertically integrated window operations.
By extruding aluminum and vinyl components in-house, we are able to secure a
low-cost, reliable source of extrusions, control product quality and reduce
inventory levels. The integration of extrusion and fabrication operations gives
us significantly more control over our manufacturing costs. We continually work
to achieve cost savings through increased capacity utilization at our efficient
facilities, adoption of best practices, reduction of cost of materials,
rationalization of product lines and reduction of inventory.
 
    We continue to build on what we believe is our position as one of the
industry's lowest cost manufacturers. Because of the scale of our operations, we
are able to negotiate price concessions for our raw materials, including glass
and vinyl. This is an important consideration since total cost of new materials
typically comprises 45% to 50% of revenue.
 
    We have been manufacturing wood products in Texas since 1953 and today have
three primary manufacturing facilities in the state. As home centers (such as
The Home Depot and Lowe's) have expanded throughout the country, we have
strategically established or acquired seven new manufacturing operations in
Alabama, Ohio, New York, North Carolina, Pennsylvania, Illinois and Texas in
order to serve these customers more efficiently. We believe we are one of the
only door suppliers which can service the home centers on a national basis. As
the home centers continue to expand into new markets, we expect to open new
facilities to serve these regions.
 
    As part of the integration of Wing and Atrium, the Atrium Wood patio door
division is merging its manufacturing, distribution and sales functions with
Wing. We are currently fitting a facility to locate all of Atrium Wood's and a
portion of Wing's manufacturing operations. Due to the fact that both divisions
sell over 80% of their products to the Home Centers, we believe significant
benefits can be realized from the synergies between the sales and distribution
functions of Atrium Wood and Wing. Both service the same customers and
distribute to the same retail locations. This integration is expected to be
completed during the fourth quarter of 1999.
 
INDUSTRY OVERVIEW
 
    In 1998, new construction spending in the United States totaled over $550
billion, of which residential and commercial spending totaled $250 billion and
$300 billion, respectively. Within the residential construction market, new
construction spending and remodel and replacement spending totaled $170 billion
and $80 billion, respectively. The residential construction market consists of
single-family and multi-family housing construction. In 1998, housing starts in
the United States totaled approximately 1.5 million, of which 1.2 million were
single-family homes and 0.3 million were multi-family homes. During 1998,
 
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approximately 91% of Atrium's window and door sales were to the single-family
housing construction market, and the remaining 9% of sales were to the
multi-family housing construction market.
 
    We believe that, in 1998, United States residential window and door
expenditures were approximately $10.0 billion, of which new construction and
remodel and replacement expenditures represented approximately $4.3 billion and
$5.7 billion, respectively.
 
    The domestic window market has grown to more than 58.2 million in unit sales
in 1998, and has generally outpaced the growth in the domestic building
materials industry. The domestic door market has grown more than 10% in sales
over the last five years. According to F.W. Dodge, the U.S. residential door
market represents more than 58.0 million units annually.
 
    WINDOWS.  The residential window industry can be divided into two end-use
segments: new construction (an estimated 18.7 million windows shipped in 1998)
and repair and remodeling (approximately 39.5 million windows sold in 1998). We
believe that the repair and remodeling segment will continue to experience
strong growth due to the strength of sales of existing homes and the increase in
the average age of homes from 23 years to 28 years in the last decade. We
believe the expected growth in this segment represents an especially attractive
opportunity to leverage existing relationships with the home center retailers.
The home center industry is one of the fastest growing retail sectors in the
United States. According to the National Home Center News, the U.S. retail home
improvement market is expected to grow from $150.0 billion in 1998 to over $170
billion by the year 2000.
 
    DOORS.  Demand for doors is derived from three principal segments: new
residential construction, repair and remodeling and commercial construction. We
are primarily affected by repair and remodeling expenditures as our products are
predominantly sold at home centers that cater to the "do-it-yourself" market and
to the smaller builders who principally do remodeling work. We estimate that
interior doors sold to the repair and remodeling segment constitute at least
one-third of all interior doors sold in the United States. We believe that the
repair and remodeling segment will continue to experience strong growth since
approximately three-quarters of total housing transactions are sales of existing
homes.
 
COMPETITION
 
    The residential window and door industry is highly fragmented. With few
exceptions, competitors are privately-owned, regional companies with sales under
$100 million. On a national basis we compete with a few national companies in
different regions, products, distribution channels and price points, but do not
compete against any single company across all of these areas. We compete with
various other companies in specific regions within each market.
 
    - WINDOWS--ALUMINUM AND VINYL.  Our major competitors for the sale of
      aluminum windows are Reliant Building Products, Inc. and Caradon
      Better-Bilt Inc. In the vinyl window and door segment, there is no
      dominant manufacturer that operates on a national basis. Regional
      manufacturers that compete on a local and regional basis characterize the
      segment. Historically, demand for vinyl windows and doors has been
      concentrated in the cooler regions of the United States. Our major
      competitors for the sale of vinyl windows are SilverLine Building
      Products, Simonton Windows and Milgard Manufacturing Inc. In addition, we
      compete with a number of regional manufacturers that sell directly to
      repair and remodeling contractors.
 
    - WINDOWS AND PATIO DOORS--WOOD.  In the wood window and door segment of the
      industry, two large manufacturers, Andersen Corporation and Pella
      Corporation, sell premium products on a national basis. Our wood windows
      and doors are sold at a medium price point and primarily through home
      centers throughout the United States and direct to builders. We have many
      competitors at our price point in the wood window and door segment,
      including Kolbe & Kolbe Millwork Co. Inc. and Hurd Millwork Co. Inc.
 
                                       8
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    DOORS.  We estimate that approximately 60% of all interior passage doors
sold through home centers are pre-hung. We expect this percentage to grow due to
the convenience and ease of installation of pre-hung doors. The pre-hung door
industry is very fragmented and consists primarily of hundreds of small
companies that do not manufacture doors and who have annual sales of $10.0 to
$30.0 million each. These companies are finding it increasingly difficult to
compete due to their lack of manufacturing capability. Our key competitors are
Premdor, Inc. and Jeld Wen, both of which manufacture and pre-hang doors. Other
competitors include Steves and Sons and Haley Bros.
 
INFLATION AND RAW MATERIALS
 
    During the past several years, the rate of general inflation has been
relatively low and has not had a significant impact on our results of
operations. We purchase raw materials, including aluminum, glass, wood and
vinyl, that are subject to fluctuations in price that may not reflect the rate
of general inflation. These materials fluctuate in price based on supply and
demand. Historically, there have been periods of significant and rapid aluminum
and wood price changes, both upward and downward, with a concurrent short-term
impact on our operating margins. We historically mitigated the effects of these
fluctuations over the long-term by passing through price increases to our
customers and through other means. For example, we enter into forward
commitments for aluminum billet to hedge against price changes, see the
footnotes to our consolidated financial statements for the year ended December
31, 1998. The primary raw materials used in the production of our windows and
doors are readily available and are procured from numerous suppliers. Currently,
wood is purchased through multiple sources from around the world, with little
dependence on one company or one country.
 
SEASONALITY
 
    The new home construction market and the market for external repairs and
remodeling in northern climates are seasonal, with increased related product
sales in the second and third quarters. The market for interior repairs and
remodeling in northern climates tends to grow in the first and fourth quarters.
Although this results in seasonal fluctuations in the sales of certain of our
products, the complementary nature of our window and door business' selling
seasons helps mitigate this seasonality.
 
CYCLICALITY
 
    Demand in the window and door manufacturing and distribution industry is
influenced by new home construction activity and the demand for repair and
remodeling. For the year ended December 31, 1998, we believe that approximately
42% of our pro forma sales were related to new home construction. Trends in the
housing sector directly impact our financial performance. Accordingly, the
strength of the U.S. economy, the age of existing home stock, job growth,
interest rates, consumer confidence and the availability of consumer credit, as
well as demographic factors, such as inter/intra-state migration of the U.S.
population have a direct impact on us. Cyclical declines in new housing starts
may adversely impact our business.
 
EMPLOYEES
 
    We employ approximately 3,200 persons, of whom approximately 3,150 are
employed at our manufacturing facilities and distribution centers and
approximately 50 are employed at corporate headquarters. Approximately 1,200 of
our hourly employees are covered by collective bargaining agreements. We entered
into collective bargaining agreements in 1998 with the United Needle and
Industrial Trade Employee Union, SWRJB, ACTWU, AFL-CIO-CLC, covering certain
employees at the Atrium Aluminum, H-R Windows, Atrium Wood and Extruders
manufacturing facilities. All of these collective bargaining agreements expire
in May, 2001. In addition, we have collective bargaining agreements with The
Sheet Metal International Association Local Union No. 54, due to expire on
September 30, 2001, for our Kel-Star
 
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operations and Local Union 2743, Southern Council of Industrial Workers,
Chartered By United Brotherhood of Carpenters and Joiners of America, AFL/CIO,
due to expire on October 6, 2001, for our Woodville Extruders operations. There
are no union affiliations in connection with any of our other divisions. We
believe that our relationship with our employees is good.
 
BACKLOG AND MATERIAL CUSTOMERS
 
    We have no material long-term contracts. Orders are generally filled within
5 to 7 days of receipt. Our backlog is subject to fluctuation due to various
factors, including the size and timing of orders for our products and is not
necessarily indicative of the level of future revenue.
 
    Our sales are concentrated with one of the leading home center retailers,
Home Depot. For the year ended December 31, 1998, Home Depot accounted for
approximately 23% of our pro forma net sales. No other customer accounted for
more than 10% of our pro forma net sales.
 
GOVERNMENT REGULATION AND ENVIRONMENTAL MATTERS
 
    We are subject to numerous federal and state statutes and regulations
relating to, among other things, air and water quality, the discharge of
materials into the environment, and safety and health issues. We do not expect
ongoing compliance with such provisions to have a material impact on our
earnings or competitive position in the foreseeable future. Additionally, no
significant capital expenditures are anticipated related to ongoing compliance
with such provisions. However, the applicable requirements under the law are
subject to amendment, and to the imposition of new, other, or additional
requirements and to changing interpretations of agencies or courts. We cannot
assure that new, other or additional requirements would not be imposed or that
expenditures, including material expenditures, would not be required to comply.
 
    We are involved in various stages of investigation and cleanup relative to
environmental protection matters, some of which relate to waste disposal sites.
The potential costs related to such matters and the possible impact thereof on
future operations have been assessed, and we believe that we have made adequate
provision for these costs such that they will have no material adverse effect
upon our financial condition or our operations. We cannot be certain that
significant capital expenditures will not become necessary for investigation and
cleanup of environmental conditions which are currently unknown.
 
    We have been named as a party in several government enforcement and private
actions associated with old waste disposal sites, some of which are on the U.S.
Environmental Protection Agency's Superfund priority list. These actions seek
cleanup costs and in some cases, damages for personal injury or property damage.
Given the uncertain nature of liability under CERCLA for Superfund sites, and
uncertainties regarding factual circumstances, the remedy to be implemented, and
other factors, we cannot determine with certainty the extent of our liability,
if any. However, we do not believe, based upon the information available at this
time, that the outcome of the matters discussed above will result in liability
which exceeds the limited amount of our alleged contribution to the respective
sites, and we do not believe that there will be a material adverse effect on our
financial condition, results of operations or liquidity.
 
RECENT DEVELOPMENTS
 
    RECAPITALIZATION
 
    On October 2, 1998, GE Investment Private Placement Partners II, a Limited
Partnership ("GEIPPPII"), which was formed by GE Investment Management
Incorporated, a wholly-owned subsidiary of General Electric Company, and
Ardshiel, Inc. ("Ardshiel"), a private equity firm, and certain of its
affiliates, acquired Atrium in a transaction valued at $225.0 million. In
connection with the Atrium acquisition, GEIPPPII and Ardshiel recapitalized Wing
and Darby and combined them with Atrium. As part of the recapitalization,
through a newly-formed company named D and W Holdings, Inc. ("Parent" or "D and
W"), GEIPPPII and Ardshiel contributed to Atrium $50.0 million of contributed
equity from the sale of common stock, approximately $52.0 million in the implied
value of the Wing and Darby businesses
 
                                       10
<PAGE>
and $45.0 million of contributed equity funded by the issuance of 12% senior
discount debentures (the "Discount Debentures") by Atrium Corporation ("Atrium
Corp."), our direct holding company. The remaining sources of funds were
financed with a $205.0 million senior secured credit facility consisting of a
$30.0 million revolver ($2.0 million drawn at closing), a $75.0 million term
loan B, and a $100.0 million term loan C (of which approximately $29.1 million
was repaid 36 days after closing). The revolving credit facility, term loan B
and term loan C mature in June 2004, June 2005 and June 2006, respectively. The
transactions described in this paragraph are referred to in this 10-K as the
"1998 Recapitalization" or "Recapitalization."
 
    DELTA ACQUISITION
 
    On January 27, 1999, the Company acquired certain assets of Delta Millwork,
Inc., a privately held door pre-hanger located in Orlando, Florida, with 1998
sales of $8.8 million. The Company financed the acquisition through its
revolving credit facility. The results of operations for the acquired business
will be included in the Company's consolidated financial statements beginning
January 27, 1999.
 
    MANAGEMENT CHANGE
 
    On April 9, 1999, the Company completed a separation agreement with Randall
S. Fojtasek, President and Chief Executive Officer, whereby Mr. Fojtasek
resigned from the Company effective March 31, 1999. The Board of Directors has
nominated Jeff L. Hull, Executive Vice President and Chief Financial Officer,
and Ken L. Gilmer, Executive Vice President and Chief Operating Officer, to
oversee day-to-day operations and report directly to the Executive Committee of
the Board of Directors. The Company expects to take a charge of approximately
$1,750 in the first quarter of fiscal year 1999 for severance benefits related
to this management change.
 
TRADEMARKS AND PATENTS
 
    The Company has registered and nonregistered trade names and trademarks
covering the principal brand names and product lines under which its products
are marketed.
 
                                       11
<PAGE>
ITEM 2.  PROPERTIES
 
    Our operations are conducted at the owned or leased facilities described
below:
 
<TABLE>
<CAPTION>
                                                                                              CAPACITY
                                                                                              (SQUARE)     OWN/
LOCATION                                               PRINCIPAL USE                            FEET       LEASE
-------------------------------  ----------------------------------------------------------  ----------  ---------
<S>                              <C>                                                         <C>         <C>
Dallas, Texas*.................  Fabrication of aluminum windows                                186,000  Lease
                                 Fabrication of wood patio doors                                266,000  Lease
                                 Fabrication of vinyl windows                                    90,000  Lease
Irving, Texas..................  Fabrication of aluminum windows                                147,218  Own
                                 Extrusion die manufacturing                                      1,400  Own
Irving, Texas..................  Distribution of all window types                                22,000  Own
                                 Fabrication of aluminum patio doors                             98,000  Own
Wylie, Texas...................  Extrusion of aluminum                                          100,000  Own
Carrollton, Texas..............  Extrusion of vinyl                                              25,200  Lease
Phoenix, Arizona...............  Distribution of aluminum windows                                44,743  Lease
Las Vegas, Nevada..............  Distribution of aluminum windows                                30,400  Lease
Woodville, Texas...............  Fabrication of aluminum windows and storm doors                180,000  Lease
                                 Extrusion of aluminum                                          120,000  Lease
San Antonio, Texas.............  Distribution of aluminum windows                                10,000  Lease
Anaheim, California............  Fabrication of vinyl windows                                    80,000  Lease
Union City, California.........  Distribution of vinyl windows                                   10,000  Lease
Portland, Oregon...............  Distribution of vinyl windows                                   10,000  Lease
Salt Lake City, Utah...........  Distribution of vinyl windows                                   10,000  Lease
Clinton, Massachusetts.........  Fabrication of vinyl windows                                    31,000  Own
Bridgeport, Connecticut........  Fabrication of vinyl windows                                    75,000  Lease
Farmingdale, New York..........  Distribution of vinyl windows                                    6,000  Lease
Greenville, Texas..............  Manufacture of solid wood and hollow core bi-fold and
                                   passage doors; pre-hanging                                   180,000  Own
Greenville, Texas..............  Door finishing operation; custom door manufacture               30,000  Lease
Hanover Park, Illinois.........  Manufacture of hollow core bi-fold and passage doors;
                                   pre-hanging; warehouse                                        73,000  Lease
Allentown, Pennsylvania........  Manufacture of hollow core bi-fold and passage doors; door
                                   pre-hanging; warehouse                                       105,000  Lease
Mt. Pleasant, Texas............  Door manufacturing                                             110,000  Lease
Cleveland, Ohio................  Door pre-hanging; warehouse                                     30,000  Lease
Charlotte, North Carolina......  Door pre-hanging; warehouse                                     40,000  Lease
Florence, Alabama*.............  Door pre-hanging; warehouse                                     60,000  Lease
</TABLE>
 
------------------------
 
*Leased from affiliates of certain stockholders. See "Certain Relationships and
 Related Transactions-- Facility Leases."
 
    We maintain our corporate headquarters in Dallas, Texas. The facilities
provide approximately 11,000 square feet and are leased for a seven-year term
expiring in 2004.
 
    We believe that our manufacturing plants are generally in good operating
condition and are adequate to meet future anticipated requirements.
 
ITEM 3.  LEGAL PROCEEDINGS
 
    We are involved from time to time in litigation arising in the ordinary
course of our business, none of which is expected to individually have a
material adverse effect on us.
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
    Not applicable.
 
                                       12
<PAGE>
                                    PART II
 
ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS
 
    There is no established public trading market for the Company's outstanding
equity securities.
 
ITEM 6.  SELECTED FINANCIAL DATA
 
    The selected income statement data set forth below for the year ended
December 31, 1995, the periods ended October 25, 1996 and December 31, 1996 and
the years ended December 31, 1997 and 1998, and the selected balance sheet data
at December 31, 1995, 1996, 1997 and 1998 were derived from the audited
financial statements of Atrium as described further below. The selected
financial data as of and for the year ended December 31, 1994, were derived from
Atrium's unaudited financial statements, which in the opinion of management
reflect all adjustments necessary for a fair presentation of results for such
periods. The selected historical financial data should be read in conjunction
with Management's Discussion and Analysis of Financial Condition and Results of
Operations and the financial statements, related notes and other financial
information included elsewhere in this 10-K.
 
    Prior to October 2, 1998, Atrium's historical financial statements as filed
with the Securities and Exchange Commission included its operations and the
operations of its subsidiaries. On October 2, 1998, pursuant to the
Recapitalization, D and W Holdings, Inc. contributed the assets of Wing and
Darby to Atrium.
 
    As Wing was determined to be the accounting acquiror in a "reverse
acquisition", the historical financial statements of Atrium (prior to October 3,
1998) were replaced with the historical financial statements of Wing. As a
result, the statement of operations for 1998 only includes the operations of
Atrium and Darby from October 3 through December 31. The statements of
operations for the years ended December 31, 1994, 1995 and 1997, the periods
ended October 25, 1996 and December 31, 1996 only include the operations and
accounts of Wing and its predecessor. Wing was acquired by it present
controlling shareholders on October 25, 1996. The December 31, 1998 balance
sheet includes the accounts of Atrium, Wing, Darby and each of their respective
subsidiaries. The December 31, 1994, 1995, 1996 and 1997, and October 25, 1996
balance sheets only include the accounts of Wing and its predecessor.
 
<TABLE>
<CAPTION>
                                                            PREDECESSOR
                                                 ---------------------------------
<S>                                              <C>        <C>        <C>          <C>            <C>            <C>
                                                                         PERIOD        PERIOD
                                                                          ENDED         ENDED       YEAR ENDED     YEAR ENDED
                                                                       OCTOBER 25,  DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                   1994       1995        1996          1996           1997           1998
                                                 ---------  ---------  -----------  -------------  -------------  -------------
                                                                             (DOLLARS IN THOUSANDS)
INCOME STATEMENT DATA:
 
  Net sales....................................  $  72,496  $  68,481   $  62,880     $  13,200      $  99,059      $ 211,059
  Income before income taxes...................        179        491       1,789           532          1,391        159,140
  Net income (loss)............................         35        279       1,119           303            696         (2,819)
BALANCE SHEET DATA (END OF PERIOD):
  Total assets.................................  $  20,740  $  18,515   $  19,966     $  36,404      $  55,383      $ 359,869
  Total debt...................................     10,296      8,522       8,154        20,489         32,238        179,227
OTHER DATA:
  EBITDA(1)....................................  $   1,777  $   2,374   $   3,014     $   1,166      $   5,836      $  14,732
  Depreciation and amortization................        689        844         716           260          1,492          7,950
  Interest expense.............................        909      1,039         509           374          2,953          9,081
</TABLE>
 
------------------------------
 
(1) While EBITDA is not intended to represent cash flow from operations as
    defined by GAAP and should not be considered as an indicator of operating
    performance or an alternative to cash flow or operating income (as measured
    by GAAP) or as a measure of liquidity, it is included herein to provide
    additional information with respect to the ability of Atrium to meet its
    future debt service, capital expenditures and working capital requirements.
    See "Management's Discussion and Analysis of Financial Condition and Results
    of Operations." Atrium believes EBITDA provides investors and analysts in
    the building materials industry the necessary information to analyze and
    compare historical results of Atrium on a comparable basis with other
    companies on the basis of operating performance, leverage and liquidity.
    However, as EBITDA is not defined by GAAP, it may not be calculated or
    comparable to other similarly titled measures within the building materials
    industry.
 
                                       13
<PAGE>
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS
 
    The following discussion and analysis should be read in conjunction with the
Consolidated Financial Statements of Atrium (after the Recapitalization) which
appears elsewhere in this 10-K.
 
CERTAIN FORWARD-LOOKING STATEMENTS
 
    This 10-K contains certain forward-looking statements (as such term is
defined in the Private Securities Litigation Reform Act of 1995) that involve
substantial risks and uncertainties relating to the Company that are based on
the beliefs of the management. When used in this 10-K, the words "anticipate",
"believe", "estimate", "expect", "intend", and similar expressions, as they
relate to the Company or the Company's management, identify forward-looking
statements. Such statements reflect the current views of the Company with
respect to the risks and uncertainties regarding the operations and results of
operations of the Company as well as its customers and suppliers, including as a
result of the availability of consumer credit, interest rates, employment
trends, changes in levels of consumer confidence, changes in consumer
preferences, national and regional trends in new housing starts, raw material
costs, pricing pressures, shifts in market demand, and general economic
conditions. Should one or more of these risks or uncertainties materialize, or
should underlying assumptions or estimates prove incorrect, actual results may
vary materially from those described herein as anticipated, believed, estimated,
expected or intended.
 
                      ATRIUM (AFTER THE RECAPITALIZATION)
 
    Prior to October 2, 1998, Atrium's historical financial statements as filed
with the Securities and Exchange Commission included its operations and the
operations of its subsidiaries. On October 2, 1998, pursuant to the
Recapitalization, D and W Holdings, Inc. contributed the assets of Wing and
Darby to Atrium.
 
    As Wing was determined to be the accounting acquiror in a "reverse
acquisition", the historical financial statements of Atrium (prior to October 3,
1998) were replaced with the historical financial statements of Wing. As a
result, the statement of operations for 1998 only includes the operations of
Atrium and Darby from October 3 through December 31. The statements of
operations for the years ended December 31, 1998 and 1997, the periods ended
October 25, 1996 and December 31, 1996 only include the operations and accounts
of Wing and its predecessor. Wing was acquired by it present controlling
shareholders on October 25, 1996.
 
                                       14
<PAGE>
RESULTS OF OPERATIONS (IN THOUSANDS, EXCEPT PERCENTAGES)
 
    The following table sets forth for the periods indicated, information
derived from Atrium's consolidated statements of operations expressed as
percentage of net sales.
 
<TABLE>
<CAPTION>
                                                                                               YEAR ENDED DECEMBER 31,
                                                                                           -------------------------------
                                                                                             1998       1997       1996
                                                                                           ---------  ---------  ---------
<S>                                                                                        <C>        <C>        <C>
Net sales................................................................................      100.0%     100.0%     100.0%
Cost of goods sold.......................................................................       75.4       79.0       75.2
                                                                                           ---------  ---------  ---------
Gross profit.............................................................................       24.6       21.0       24.8
Selling, delivery, general and administrative expenses...................................       18.8       15.8       20.4
Amortization expense.....................................................................        1.0        0.8        0.2
Stock option compensation expense........................................................        1.8         --         --
                                                                                           ---------  ---------  ---------
Income from operations...................................................................        2.9        4.4        4.2
Interest expense.........................................................................        4.3        3.0        1.2
Other income, net........................................................................        0.3         --         --
                                                                                           ---------  ---------  ---------
Income (loss) before income taxes and extraordinary charge...............................       (1.1)       1.4        3.1
Provision (benefit) for income taxes.....................................................       (0.1)       0.7        1.2
                                                                                           ---------  ---------  ---------
Income (loss) before extraordinary charge................................................       (1.0)       0.7        1.9
Extraordinary charge, net of income tax benefit..........................................        0.3         --         --
                                                                                           ---------  ---------  ---------
Net income (loss)........................................................................       (1.3)%       0.7%       1.9%
                                                                                           ---------  ---------  ---------
                                                                                           ---------  ---------  ---------
</TABLE>
 
YEAR ENDED DECEMBER 31, 1998 COMPARED TO YEAR ENDED DECEMBER 31, 1997
 
    NET SALES.  Net sales increased by $112,000 from $99,059 in 1997 to $211,059
in 1998. The increase was due primarily to a combined increase in net sales of
$87,909 from the addition of the Company and Darby in connection with the
Recapitalization in October 1998 and the acquisition of Super Millwork in
November 1997. Additionally, net sales at Wing increased 24.3% due to the
increase in sales to the large home center retail chains.
 
    COST OF GOODS SOLD.  Cost of goods sold decreased from 79.0% of net sales
during 1997 to 75.4% of net sales during 1998. The decrease was due largely to
the addition of the Company and Darby in the fourth quarter of 1998, as these
divisions operate at higher margins than Wing.
 
    SELLING, DELIVERY, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, delivery,
general and administrative expenses increased $24,083 from $15,671 (15.8% of net
sales during 1997) to $39,754 (18.8% of net sales during 1998). The increase was
primarily due to the inclusion of selling, delivery, general and administrative
expenses of Super Millwork for twelve months and the Company and Darby for three
months. Additionally, selling and delivery expenses increased due to the
increase in net sales.
 
    AMORTIZATION EXPENSE.  Amortization expense increased $1,359 from $774
during 1997 to $2,133 during 1998. The increase was largely due to the
amortization of goodwill recorded in connection with the Recapitalization.
 
    STOCK OPTION COMPENSATION EXPENSE.  Stock option compensation expense
increased $3,851 from $0 during 1997 to $3,851 during 1998. Stock option
compensation expense consisted of $2,813 representing the difference between the
fair market value of common stock of Parent and the exercise price associated
with a warrant granted to an executive of the Company in connection with the
Recapitalization, charges associated with previously issued stock options at
exercise prices below the fair value of the underlying common stock and charges
associated with certain variable options.
 
    INTEREST EXPENSE.  Interest expense increased $6,128 from $2,953 during 1997
to $9,081 during 1998. The increase in interest expense was due primarily to an
increase in average outstanding debt related to the Loans issued and Senior
Subordinated Notes assumed in connection with the Recapitalization. In addition,
interest expense included the amortization of deferred financing costs recorded
in connection with the recapitalization.
 
                                       15
<PAGE>
    EXTRAORDINARY CHARGE.  Extraordinary charge increased $639 from $0 during
1997 to $639 during 1998. Extraordinary charge represents the write-off of
certain deferred financing costs incurred in the placement of Wing's debt, which
was repaid in connection with the Recapitalization. This amount is net of income
tax benefit of $392.
 
YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996
 
    NET SALES.  Net sales increased by $22,979 from $76,080 in 1996 to $99,059
in 1997. The increase was primarily due to the increase in sales to the large
home center retail chains. The two largest home center retailers, which are
Wing's top two customers, have experienced sales growth in excess of 25%.
Additionally, the increase included $4,140 from the Super Millwork acquisition
in November 1997.
 
    COST OF GOODS SOLD.  Cost of goods sold increased from 75.2% of net sales
during 1996 to 79.0% of net sales during 1997. The increase is largely the
result of significant start-up costs incurred at the Cleveland prehanging
facility, the Allentown, Pennsylvania prehanging and hollow core manufacturing
facility and transition costs associated with moving a portion of the sales
volume attributable to the Super Millwork acquisition to the Allentown facility.
 
    SELLING, DELIVERY, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, delivery,
general and administrative expenses increased $158 from $15,513 (20.4% of sales
during 1996) to $15,671 (15.8% of sales during 1997). The decrease as a
percentage of sales is primarily attributable to lower freight costs per unit as
additional prehanging/distribution facilities are opened. Additionally, retail
store display expenses were reduced as a result of the implementation of a lower
cost display program.
 
    AMORTIZATION EXPENSE.  Amortization expense increased $649 from $125 during
1996 to $774 during 1997. The increase was due primarily to the amortization of
goodwill recorded in connection with the October 1996 acquisition of Wing.
 
    INTEREST EXPENSE.  Interest expense increased $2,070 from $883 during 1996
to $2,953 during 1997. The increase was due largely to an increase in average
outstanding debt which resulted from the incurrence of additional debt related
to the Wing acquisition in October 1996 and the Super Millwork acquisition in
November 1997, as well as borrowings under the Wing Credit Facility. Interest
expense during 1996 and 1997 includes amortization of related deferred financing
costs.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    Cash generated from operations and availability under the Revolving Facility
are the Company's principal sources of liquidity. During 1998, cash was
primarily used in connection with the Recapitalization and for capital
expenditures. Net cash used in operating activities was $8,024 during 1998
compared to cash provided by operations of $1,148 during 1997. The increase in
cash used in operations was primarily attributable to a decrease in net income
and an increase in inventories. Cash flows from financing activities increased
from cash provided of $10,609 during 1997 to $133,174 during 1998. The increase
was due primarily to borrowings and contributions from Corp. made in connection
with the Recapitalization.
 
OTHER CAPITAL RESOURCES
 
    In connection with the Recapitalization, the Company entered into a Credit
Agreement providing for a Revolving Facility in the amount of $30,000, of which
$5,000 is available under a letter of credit sub-facility. The Revolving
Facility has a maturity date of June 30, 2004. At December 31, 1998, the Company
had $23,273 of availability under the Revolving Facility, net of borrowings of
$4,118 and outstanding letters of credit totaling $2,609.
 
CAPITAL EXPENDITURES
 
    The Company had cash capital expenditures (exclusive of the
Recapitalization) of $2,221 during 1998, compared to $1,355 and $1,083 during
1997 and 1996, respectively. The increase is largely due to the addition of the
Company and Darby for the last three months of 1998. The Company expects capital
expenditures (exclusive of acquisitions) in 1999 to be approximately $9,500,
however, actual capital
 
                                       16
<PAGE>
requirements may change, particularly as a result of acquisitions the Company
may make. Capital expenditures exclude costs related to the implementation of
the Company's new management information system which include internally
capitalized costs.
 
    The ability of the Company to meet its debt service and working capital
obligations and capital expenditure requirements is dependent, however, upon the
future performance of the Company and its subsidiaries which, in turn, will be
subject to general economic conditions and to financial, business and other
factors, including factors beyond the Company's control. As of March 31, 1999,
the Company had $16,991 available for borrowings under the Revolving Facility,
net of borrowings of $10,700 and outstanding letters of credit totaling $2,609.
 
YEAR 2000
 
    Many existing computer systems and applications and other control devices
are coded to use only two digits (rather than four) to identify a year in the
date code field. These date code fields will need to accept four digit entries
to distinguish 21st century dates from 20th century dates. Many computer
programs and systems, including certain programs and systems utilized by us, are
highly dependent upon financial and other data that, based on the program's or
system's inability to distinguish between the Year 2000 and other century-end
dates, could be misreported or misinterpreted and cause significant errors. If
not corrected, many computer applications could fail when processing data
related to the Year 2000. In addition, two interacting systems, applications or
devices, each of which has individually been fixed so that it will individually
handle Year 2000 issue, could nonetheless suffer "integration failure" because
their method of dealing with the problem is not compatible.
 
    This Year 2000 issue impacts our owned or licensed computer systems and
equipment and the computer systems and equipment of third parties upon which we
rely. The Year 2000 problem could cause these systems to fail, err, and, in the
case of third party systems, become incompatible with our systems. Therefore, if
we, or a significant third party fail to become Year 2000 ready, or if the Year
2000 problem causes our systems to become internally incompatible or
incompatible with any key third party systems, our business could suffer
material disruptions.
 
    We are assessing the impact of the Year 2000 problem and have or intend to
modify portions of our hardware and software so that our computer systems will
function properly with respect to date in the Year 2000 and thereafter. We have
reviewed and continue to review each operating unit for the appropriate
information system enhancements, with respect to both Year 2000 problem as well
as strategic system upgrade.
 
    To achieve our overall operating strategy, we are enhancing our information
technology by installing new software to implement a fully integrated
manufacturing system for our operating units. This system is intended to be Year
2000 compliant. Each operating unit was prioritized for installation of the
system based on any Year 2000 issues, with the final phase of implementation and
installation of this system scheduled to be completed by the third quarter of
1999. We believe that with this strategy and completed installations, the Year
2000 problem will not pose significant operational problem for us. We can not
assure you, however, that our computer systems, or other companies acquired in
the future or the computer systems of other companies with whom we conduct
business, will be Year 2000 compliant prior to December 31, 1999 or that the
inability of any such systems to process accurately Year 2000 data will not have
a material adverse effect on our business, operating results or financial
condition.
 
    The total amount of costs to be incurred by the Company to address these
system enhancements is estimated at $1,500. The Company has expensed
approximately $750 through December 31, 1998.
 
                                       17
<PAGE>
FINANCIAL ACCOUNTING STANDARDS
 
    In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 130 ("FAS 130") "Reporting
Comprehensive Income." FAS 130 requires that all items that are required to be
recognized under accounting standards as components of comprehensive income be
reported in a financial statement that is displayed with the same prominence as
other financial statements. FAS 130 is effective for financial statement periods
beginning after December 15, 1997. The Company adopted FAS 130 beginning January
1, 1998. The Company had no comprehensive income for all periods presented prior
to January 1, 1998.
 
    In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants ("AcSEC") Issued Statement of Position
98-1 ("SOP 98-1") "Accounting for the Costs of Computer Software Developed or
Obtained for Internal Use" that is effective for reporting periods beginning
after December 15, 1998, but provides for earlier application if certain
conditions are met. The Company has applied the provisions of SOP 98-1 in its
financial statements for the year ended December 31, 1998 and its adoption had
no material effect on the Company's consolidated financial position or results
of operations.
 
    In June 1998, the FASB issued Statement of Financial Accounting Standards
No. 133 ("FAS 133") "Accounting for Derivative Instruments and Hedging
Activities" that is effective for all fiscal quarters of fiscal years beginning
after June 15, 1999. The Company will implement the provisions of FAS 133 as
required. The future adoption of FAS 133 in not expected to have a material
effect on the Company's consolidated financial position or results of
operations.
 
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
    The financial statements are listed in the accompanying Index to Financial
Statements on page F-1 of this report.
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE
 
    Not applicable.
 
                                       18
<PAGE>
                                    PART III
 
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
    The following table provides information concerning the directors and the
executive officers of D and W Holdings, Inc. and its subsidiaries.
 
<TABLE>
<CAPTION>
NAME                                                       AGE                            POSITION
-----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
R.L. Gilmer..........................................          45   Executive Vice President, Chief Operating Officer and
                                                                    Director
Jeff L. Hull.........................................          33   Executive Vice President, Chief Financial Officer,
                                                                    Treasurer, Secretary and Director
Louis W. Simi, Jr....................................          58   Executive Vice President of Operations, Atrium
                                                                    Companies, Inc.
Michael Quadhamer....................................          34   President, Wing Industries, Inc.
Cliff Darby..........................................          32   President, R.G. Darby Company, Inc. and Total Trim,
                                                                    Inc.
Eric W. Long.........................................          31   Vice President, Corporate Controller and Assistant
                                                                    Secretary
Sam A. Wing, Jr......................................          75   Chairman Emeritus and Director
Daniel T. Morley.....................................          46   Chairman of the Board of Directors
James G. Turner......................................          30   Vice President and Director
Roger A. Knight......................................          39   Director
Andreas Hildebrand...................................          31   Director
John Deterding.......................................          65   Director
Nimrod Natan.........................................          35   Director
</TABLE>
 
    R.L. Gilmer has served as Executive Vice President of D and W since April
1999 and as the Chief Operating Officer and Director of D and W since October
1998. Mr. Gilmer has also served as President and Chief Executive Officer of
Wing Industries Holdings since 1996. Prior to that, he was Vice President of
Wing from July 1993 to October 1996. Mr. Gilmer has served Wing in various
capacities since 1986 including as Controller and Manufacturing Manager. Prior
to joining Wing, Mr. Gilmer was a certified public accountant with the
accounting firm of Arthur Andersen & Co.
 
    Jeff L. Hull has served as Executive Vice President and Director of D and W
since April 1999 and as Chief Financial Officer, Treasurer and Secretary of D
and W since October 1998. Mr. Hull has served as our Chief Financial Officer
from April 1996 and Secretary and Treasurer from December 1996. Prior to that,
Mr. Hull managed the asset/liability department of AmVestors Financial
Corporation (NYSE:AMV) from June 1995. From 1990 to 1995, he was an audit
manager with the accounting firm of Deloitte & Touche. Mr. Hull is a certified
public accountant.
 
    Louis W. Simi, Jr. has served as our Executive Vice President from 1993 to
October 1998 and General Manager of our Atrium Aluminum division from 1971 to
1998. Mr. Simi also served as our Director from July 1995 to November 1996. He
has served in other capacities with us and our subsidiaries since 1966.
 
    Michael Quadhamer has served as President of Wing since October 1998. Prior
to that, he served as Vice President and Chief Financial Officer of Wing
Industries Holdings from October 1996 until October 1998. Mr. Quadhamer has
served Wing in various capacities since 1991 including as Controller and as
Director of Global Operations. Prior to joining Wing, he worked for the
accounting firm of Arthur Andersen & Co. Mr. Quadhamer is a certified public
accountant.
 
    Cliff Darby has served as President of Darby since 1993 and has worked for
Darby since 1988, performing numerous functions including overseeing operations
in the door plant, installing materials for Total Trim, Inc., sales, and pricing
of jobs.
 
                                       19
<PAGE>
    Eric W. Long has served as Vice President of Atrium since April 1999 and as
Corporate Controller and Assistant Secretary of Atrium since April 1996. From
April 1995 to April 1996, Mr. Long was a financial analyst with Applebee's
International. From 1991 to 1995, he was with the accounting firm of Deloitte &
Touche L.L.P. Mr. Long is a certified public accountant.
 
    Sam A. Wing, Jr. has served as Chairman Emeritus and Director of D and W
since October 1998. Mr. Wing has served Wing in various capacities since 1946,
including as Chairman Emeritus from 1996 until October 1998, as Chairman and
Chief Executive Officer from 1995 until 1996 and as Chairman from 1994 until
1995. Prior to that, Mr. Wing was Chairman and Chief Executive Officer of Wing
from 1969 to 1994.
 
    Daniel T. Morley has served as Chairman of the Board of Directors of D and W
since October 1998. Mr. Morley has served as President of Ardshiel since 1997
and Chairman of WIH since 1996 and Door since January 1998. Mr. Morley also
serves as Chairman of Astro Textiles, Inc. and Koala Holdings, Inc, privately
held companies.
 
    James G. Turner has served as Vice President and Director of D and W since
October 1998. Mr. Turner has served as a Principal of Ardshiel since June 1997.
Mr. Turner has also served as a Director of Wing since October 1997 and Door
since December 1997. From March 1994 until June 1997, Mr. Turner worked as an
Associate for Ardshiel. Prior to that, Mr. Turner worked for Chemical Banking
Corp. since 1991.
 
    Roger A. Knight has served as a Director of D and W since October 1998. Mr.
Knight has served as a Principal of Ardshiel since May 1998. Prior to joining
Ardshiel, he was Managing Director and a member of the Coopers & Lybrand
Securities, Inc., the wholly-owned investment banking subsidiary of Coopers &
Lybrand L.L.P. (now known as PricewaterhouseCoopers LLP).
 
    Andreas Hildebrand has served as a Director of D and W since October 1998.
Mr. Hildebrand is Vice President--Private Equities of GE Investments. Mr.
Hildebrand also served as a Director of Wing since October 1997 and of Darby
since January 1998. He has served in other capacities with GE Investments during
the past five years. Mr. Hildebrand is also a Director of Eagle Family Foods
Holdings, Inc., a privately held company.
 
    John C. Deterding has served as Director of D and W since October 1998. Mr.
Deterding has been the owner of Deterding Associates, a real estate consulting
company, since June 1993. From 1975 until June 1993, he served as Senior Vice
President and General Manager of the Commercial Real Estate division of General
Electric Capital Corporation ("GECC"). From November 1989 to June 1993, Mr.
Deterding served as Chairman of the General Electric Real Estate Investment
Company, a privately held REIT. He served as Director of GECC Financial
Corporation from 1986 to 1993. Mr. Deterding is also a Director of Patriot
American Hospitality and a former member and trustee of the Urban Land
Institute.
 
    Nimrod Natan has served as a Director of D and W since October 1998. Mr.
Natan has served as a Principal of Ardshiel since 1997. Mr. Natan also serves as
a director of Wing and Astro Holdings, Inc., a privately held company. Prior to
joining Ardshiel in 1997, Mr. Natan was a management consultant with Gemini
Consulting for four years.
 
                                       20
<PAGE>
ITEM 11.  EXECUTIVE COMPENSATION
 
EXECUTIVE COMPENSATION AND OTHER INFORMATION
 
    COMPENSATION OF NAMED EXECUTIVE OFFICERS.  The following table provides
certain summary information for each of the years ended December 31, 1996, 1997
and 1998 concerning compensation paid or accrued by us to or on behalf of the
Chief Executive Officer and the four other most highly compensated persons
functioning effectively as our executive officers whose individual combined
salary and bonus exceeded $100,000 during such period (the "Named Executive
Officers"):
 
<TABLE>
<CAPTION>
                                                         ANNUAL COMPENSATION               LONG-TERM
                                              -----------------------------------------  COMPENSATION
                                                                         OTHER ANNUAL     SECURITIES      ALL OTHER
                                                SALARY       BONUS       COMPENSATION     UNDERLYING    COMPENSATION
 NAME AND PRINCIPAL POSITION(1)      YEAR        ($)          ($)           ($)(1)         OPTIONS#          ($)
---------------------------------  ---------  ----------  ------------  ---------------  -------------  -------------
<S>                                <C>        <C>         <C>           <C>              <C>            <C>
*Randall S. Fojtasek ............       1998  $  350,000  $  3,140,000     $      --      $ 5,735,369    $ 2,542,570(2)
  President and Chief Executive         1997     350,000       125,000            --               --        308,928(3)
  Officer                               1996     303,865     3,075,000            --        2,195,222        221,500(4)
 
Jeff L. Hull ....................       1998     155,000       175,000            --        1,183,842             --
  Executive Vice President, Chief       1997     120,000        20,000            --            5,000         15,146(3)
  Financial Officer, Secretary          1996     100,000             0            --          100,000             --
  and Treasurer
 
R.L. Gilmer .....................       1998     215,000        56,250            --        1,183,842             --
  Executive Vice President, Chief       1997     138,679        70,000            --               --             --
  Operating Officer                     1996     106,113       286,889            --          539,682             --
 
Louis W. Simi, Jr. ..............       1998     170,000       185,000            --          250,000        662,923(2)
  Executive Vice President of           1997     125,000       250,690            --               --        106,025(3)
  Operations, Atrium Companies,         1996     125,000       270,681            --          511,237        282,886(4)
  Inc.
 
Cliff Darby .....................       1998     150,000        76,000            --          832,314             --
  President, R.G. Darby Company,        1997     150,000        66,000            --               --             --
  Inc. and Total Trim, Inc.             1996     150,000        66,000            --               --             --
</TABLE>
 
------------------------
 
*   Resigned effective March 31, 1999.
 
(1) Perquisites related to automobile and expense allowances are excluded since
    the aggregated amounts are the lesser of $50,000 or 10% of the total annual
    salary.
 
(2) In connection with a change of control transaction, certain members of
    management were granted options at below fair market prices. Accordingly,
    compensation expense is being recognized for financial statement purposes.
    Upon completion of the 1998 Recapitalization and the exercise of these
    options, the compensatory portion of the options were reflected in the
    individual's wages and in our financial statements.
 
(3) Amounts represent fees received in connection with the termination of the
    purchase and sale agreement to acquire PlyGem Industries, Inc.
 
(4) In connection with a change of control transaction, certain members of
    management were granted options at below fair market prices. Accordingly,
    compensation expense is being recognized for financial statement purposes.
 
                                       21
<PAGE>
    OPTION GRANTS DURING 1998.  The following table sets forth option grants to
the Named Executive Officers during the year ended December 31, 1998.
 
<TABLE>
<CAPTION>
                             NUMBER OF          INDIVIDUAL GRANTS                       POTENTIAL REALIZABLE VALUE
                             SECURITIES  --------------------------------               AT ASSUMED ANNUAL RATES OF
                             UNDERLYING     % OF TOTAL                                   STOCK PRICE APPRECIATION
                              OPTIONS     OPTIONS GRANTED    EXERCISE OR                    FOR OPTION TERM(2)
                              GRANTED     TO EMPLOYEES IN    BASE PRICE    EXPIRATION   --------------------------
NAME                            (#)         FISCAL YEAR        ($/SH)         DATE         5%($)         10%($)
---------------------------  ----------  -----------------  -------------  -----------  ------------  ------------
<S>                          <C>         <C>                <C>            <C>          <C>           <C>
Randall S. Fojtasek........   1,894,148             15        $    1.00      10/02/08   $  1,191,419  $  3,019,272
                              2,841,221             22              .01      10/02/08      4,599,937     7,341,715
Jeff L. Hull...............   1,183,842              9             1.00      10/02/08        744,637     1,887,044
R.L. Gilmer................   1,183,842              9             1.00      10/02/08        744,637     1,887,044
Louis W. Simi, Jr..........     250,000              2             1.00      10/02/08        157,250       398,500
Cliff Darby................     466,101              4             1.00      10/02/08        293,178       742,965
                                832,314              8              .83       1/09/08        434,416     1,101,019
</TABLE>
 
------------------------
 
(1) All options are for the common stock of D and W Holdings, Inc..
 
(2) The assumed rates are compounded annually for the full terms of the options.
 
(3) Options vest ratably over the life of the respective employment contract,
    except for Simi and Darby, which vest ratably over five years.
 
    AGGREGATED OPTION EXERCISES AND FISCAL-YEAR-END OPTION VALUES.  The
following table sets forth option exercises by the Named Executive Officers and
value of in-the-money unexercised options held at December 31, 1998.
 
<TABLE>
<CAPTION>
                                                             NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                            UNDERLYING UNEXERCISED     IN-THE- MONEY OPTIONS AT
                                SHARES                      OPTIONS AT FY-END (#)               FY-END
                             ACQUIRED ON       VALUE      --------------------------  ---------------------------
NAME                         EXERCISE (#)   REALIZED($)   EXERCISABLE UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
--------------------------  --------------  ------------  ----------  --------------  ------------  -------------
<S>                         <C>             <C>           <C>         <C>             <C>           <C>
Randall S. Fojtasek.......    2,195,222(1)  $  5,118,108   3,841,221    1,894,148(3)  $  3,802,808    $      --
Jeff L. Hull..............      105,000(1)       244,805     125,000    1,183,842(3)       123,750           --
R.L. Gilmer...............          883(2)       108,167     231,136    1,183,842(3)       228,825           --
Louis W. Simi, Jr.........      511,237(1)     1,191,937     250,000      250,000(3)       247,500           --
Cliff Darby...............           --               --     231,136      466,101(3)       228,824           --
</TABLE>
 
------------------------
 
(1) Represents options exercised by the named individual to purchase common
    stock of Atrium Corp.
 
(2) Represents options exercised to purchase common stock of Wing Industries
    Holdings, Inc.
 
(3) Represents options held by the named individual to purchase common stock of
    D and W Holdings, Inc.
 
(4) Represents options held by the named individuals to purchase common stock of
    D and W Holdings, Inc. Based on the fair market value of the option shares
    at fiscal year end ($1.00 per share) less the exercise price per share
    payable for such shares.
 
OPTION PLANS
 
    In connection with the 1998 Recapitalization, the Board of Directors and
stockholders of D and W adopted the D and W Holdings, Inc. 1998 Stock Option
Plan (the "New Plan") providing for the grant of options to purchase common
stock of D and W to key employees and eligible non-employees of D and W and its
subsidiaries. The Stock Option Plan provides for the grant of options to
purchase up to 11,991,142 shares of D and W common stock. In conjunction with
the 1998 Recapitalization, options to purchase
 
                                       22
<PAGE>
3,582,353 shares of D and W common stock were granted to management of Darby and
Wing in exchange for outstanding options to purchase Darby and Wing stock.
Options to purchase an additional 8,153,588 shares of D and W common stock were
granted to management of D and W and its subsidiaries contemporaneously with the
1998 Recapitalization. After the 1998 Recapitalization, 255,201 shares of D and
W common stock were reserved for future grants under the New Plan. The New Plan
is administered by the compensation committee of the Board of Directors of D and
W.
 
    The New Plan provides that options may be granted in the form of incentive
options qualified for favorable tax treatment under Section 422 of the Internal
Revenue Code or in the form of non-qualified options, which do not qualify under
Section 422. All options granted in connection with the 1998 Recapitalization
are non-qualified options. Unless otherwise provided by the compensation
committee, options granted under the New Plan generally have a term of ten (10)
years from the date of grant and vest in equal installments annually over five
years dependent on continued employment. No option is exercisable until it has
vested. Options granted upon consummation of the 1998 Recapitalization in
exchange for outstanding options of Darby and Wing continue to vest on the
schedule applicable to the exchanged options. Of such options, options to
purchase 371,138 shares of D and W common stock were fully vested upon grant. Of
the options granted in connection with the 1998 Recapitalization, options to
purchase 993,115 shares of D and W common stock will vest only in connection
with a value event, defined as:
 
    - the sale of D and W common stock by D and W in an offering registered with
      the SEC which constitutes a qualifying public offering,
 
    - D and W merging or consolidating with another corporation in a merger in
      which the surviving corporation has freely tradeable common stock, or
 
    - the sale or transfer of substantially all of the assets of D and W and its
      subsidiaries, taken as a whole.
 
    The exercise price of all options was set by the compensation committee upon
grant, and with respect to incentive options is at least equal to the fair
market value of the D and W common stock on the date of grant.
 
    Options are nontransferable other than in accordance with the laws of
descent and distribution. Unvested options will expire, unless otherwise
provided by the compensation committee, upon the optionee's death, disability or
termination of employment for any reason. Upon an optionee's death or disability
the optionee or his or her representative or heir will have the right to
exercise the vested portion of any options for 180 days after the date of death
or disability. Upon termination for cause or voluntary termination by the
optionee without good reason all vested options will automatically expire. Upon
termination of employment for any other reason, including retirement or
termination without cause, the optionee will have the right to exercise the
vested portion of any option for 30 days after the date of termination. Also,
upon termination of an optionee's employment for any reason, D and W will have
the right to purchase outstanding options and any shares of D and W common stock
held by the optionee as a result of the exercise of an option. If termination
occurs with cause, the purchase price will be the lesser of the fair market
value of the D and W common stock or the original cost of the shares or options
purchased, minus the exercise price of any options purchased. In all other
cases, the purchase price will be equal to the fair market value of the D and W
common stock, minus the exercise price of any options purchased.
 
REPLACEMENT STOCK OPTION PLAN
 
    In addition to the New Plan, the Board of Directors and stockholders of D
and W adopted the D and W Holdings, Inc. Replacement Stock Option Plan (the
"Replacement Plan") to govern the terms of certain options to purchase D and W
common stock which were granted in replacement of outstanding options of Atrium
Corp. in connection with the 1998 Recapitalization. Under the Replacement Plan,
options to purchase an aggregate of 1,575,000 shares of D and W common stock
were granted in exchange
 
                                       23
<PAGE>
for outstanding options of Atrium Corp. which were not cashed out in the 1998
Recapitalization. The options granted pursuant to the Replacement Plan vest
ratably over a period of five years on each anniversary date of the grant. The
replacement options have an exercise price of $0.01 per share.
 
    Upon termination of an optionee's employment, D and W shall have the right
to repurchase from the optionee all or any portion of their replacement option.
In the event such termination of employment is for Cause, as defined in the
Replacement Plan, the price per option repurchased will be equal to the lesser
of $1.00 per underlying share and the market value per share of D and W common
stock in either case, minus $0.01 per share. If termination occurs for any
reason other than Cause, the repurchase price will, (i) for the unvested portion
of an option be equal to the lesser of the market value per share and $1.00 per
share, in each case minus $0.01 per share, and (ii) for the vested portion of an
option, be equal to the greater of market value per share or $1.00, in each case
minus $0.01 per share. Upon exercise of any vested portion of a replacement
option, D and W may require the optionee to execute a buy-sell agreement
containing provisions similar to the repurchase provisions described above, as a
condition to such option exercise.
 
    The Replacement Plan provides that all options granted thereunder are in the
form of nonqualified options, which are options that do not qualify for favored
tax treatment under Section 422 of the Internal Revenue Code. The replacement
options have a term of 20 years from the date of grant subject to early
termination in connection with termination of employment. No option is
exercisable until it is vested. Replacement options are not transferable by an
optionee, either voluntarily, involuntarily or by operation of law, except that
options may be transferred to an optionee's family members or personal
representative, so long as the transferee agrees to be bound by the provisions
of an option agreement and replacement plan.
 
BONUS PLAN
 
    We maintain a bonus plan providing for annual bonus awards to certain key
employees. Such bonus amounts are based on Atrium and its divisions meeting
certain performance goals established by our board of directors.
 
OTHER BENEFIT PROGRAMS
 
    Our executive officers also participate in other employee benefit programs
including health insurance, group life insurance, and a savings and supplemental
retirement plan (the "401(k) Plan") on the same basis as our other employees.
 
EMPLOYMENT AGREEMENTS
 
    Mr. Hull has entered into an employment agreement with D and W pursuant to
which he serves as Chief Financial Officer of D and W. Mr. Hull's employment
agreement has a four year term, commencing in October 1998. Under the terms of
Mr. Hull's employment agreement, he is entitled to receive an annual base salary
of $225,000, as adjusted, subject to increase at the discretion of the Board of
Directors. The agreement provides that Mr. Hull may receive an annual
performance bonus of up to $125,000, as adjusted;
 
    - 50% of which will be payable contingent on achievement of D and W's EBITDA
      plan,
 
    - 35% of which will be payable upon achievement of targets established by
      the Board of Directors for bad debt collections, accounts receivable days
      and month end closing, and
 
    - 15% of which will be payable contingent on achievement of management's
      objectives set from time to time by the Board of Directors.
 
    Pursuant to the agreement, Mr. Hull received options to purchase 1,183,842
shares of D and W common stock pursuant to the stock option plan. The options
have an exercise price of $1.00 per share, subject to adjustment under the stock
option plan, and will vest in equal installments over four years from
 
                                       24
<PAGE>
the date of grant. The agreement also provides that in the event Mr. Hull is
terminated by D and W without cause, or terminates his employment for good
reason, D and W will pay to Mr. Hull a payment
 
    - in a lump sum, an amount equal to the sum of his annual base salary earned
      or accrued through the termination date, reimbursement of his reasonable
      and necessary expenses, any unpaid accrued vacation pay and any amount
      arising from his benefits to be received pursuant to D and W's investment
      plans, plus
 
    - equal to a prorated portion of his incentive bonus, plus
 
    - equal to one-twelfth of his annual base salary on the date of termination
      together with 80% of his maximum incentive bonus for each month during a
      period of twelve months following the date of his termination.
 
    Such payments would also be made if Mr. Hull's employment is terminated by D
and W in connection with a change of control of D and W, as defined in the
agreement. Pursuant to the agreement, Mr. Hull agrees not to compete with D and
W and its subsidiaries until (i) one year following termination by D and W for
cause or due to disability or as a result of termination initiated by him
without good reason, or (ii) the last day of any period he is receiving
severance payments upon termination by D and W without cause or upon a change of
control, or as a result of termination initiated by him with good reason.
 
    Mr. Gilmer has entered into an employment agreement with D and W pursuant to
which he serves as Chief Operating Officer of D and W. Mr. Gilmer's employment
agreement has a four year term, commencing in October 1998. Under the terms of
Mr. Gilmer's employment agreement, he is entitled to receive an annual base
salary of $225,000, as adjusted, subject to increase at the discretion of the
Board of Directors. The agreement provides that Mr. Gilmer may receive an annual
performance bonus of up to $125,000,
 
    - 75% of which will be payable contingent on achievement of D and W's EBITDA
      plan,
 
    - 15% of which will be payable contingent on achievement of management
      objectives set from time to time by the Board of Directors, and
 
    - 10% of which will be payable contingent on achievement of a target return
      on equity for D and W set by the Board of Directors.
 
    Pursuant to the agreement, Mr. Gilmer received options to purchase 1,183,842
shares of D and W common stock upon the same terms as the options received by
Mr. Hull. The agreement also provides that, in the event Mr. Gilmer is
terminated by D and W without cause, or terminates his employment for good
reason, D and W will pay to Mr. Gilmer a payment
 
    - in a lump sum, an amount equal to the sum of his annual base salary earned
      or accrued through the termination date, reimbursement of his reasonable
      and necessary expenses, any unpaid accrued vacation pay and any amount
      arising from his benefits to be received pursuant to Holdings' investment
      plans, plus
 
    - an amount equal to a prorated portion of his incentive bonus, plus
 
    - an amount equal to one-twelfth of his annual base salary on the date of
      termination together with 80% of his maximum base incentive bonus for each
      month during a period of twelve months following the date of his
      termination.
 
    Such payments would also be made if Mr. Gilmer's employment is terminated by
D and W in connection with a change of control of D and W, as defined in the
agreement. Pursuant to the agreement, Mr. Gilmer agrees not to compete with D
and W and its subsidiaries until (i) one year following termination by D and W
for cause or due to disability or as a result of termination initiated by him
without good reason, or (ii) the last day of any period he is receiving
severance payments upon termination by D and W without cause or upon a change of
control, or as a result of termination initiated by him with good reason.
 
                                       25
<PAGE>
    The Company entered into an employment agreement with Mr. Simi on January 1,
1998. The compensation provided to Mr. Simi includes an annual base salary of
$170,000, subject to increases at the discretion of the Board of Directors.
Additionally, Mr. Simi is eligible for an incentive bonus based on certain
performance targets.
 
    Mr. Simi's employment agreement terminates on December 31, 2000. If Mr.
Simi's employment with the Company is terminated by the Company for any reason
other than for cause, he will continue to be paid his salary for 12 months,
together with the annual incentive bonus. Mr. Simi has agreed not to compete
with the Company in certain geographic areas for so long as the Company pays
salary to him.
 
    On January 9, 1998, Mr. Cliff Darby entered into an employment agreement
with Darby for a term commencing in January, 1998. Under the terms of Mr.
Darby's employment agreement, he is entitled to receive an annual base salary of
$156,000, as adjusted, subject to increase at the discretion of the Board of
Directors of Darby. Mr. Darby is entitled to annual performance bonus payable
upon the achievement of Darby's EBITDA plan. The agreement also provides that in
the event Mr. Darby is terminated by Darby without cause, as defined in the
agreement, Darby will pay to Mr. Darby a payment
 
    - in a lump sum equal to all compensation accrued and unpaid as of the date
      of termination, and
 
    - in equal semi-monthly installments, an amount equal to the compensation to
      which Mr. Darby would have been entitled under the agreement for a period
      of one year if the agreement had not been terminated.
 
    Pursuant to the agreement, Mr. Darby has agreed not to compete with the
business of Darby for a period of five years from the date of the agreement,
whether the agreement terminates prior to the end of such five year period;
provided that the non-competition covenant shall apply for one year following
termination without cause by Darby regardless of the date of termination.
 
    Upon consummation of the merger, Mr. Darby received options to purchase
466,101 shares of D and W common stock, with an exercise price of $1.00 per
share. Such options vest over a five year period from the date of grant.
 
BOARD OF DIRECTORS
 
    COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    Daniel T. Morley, and Andreas Hildebrand serve as members of our
    compensation committee.
 
    AUDIT COMMITTEE
 
    James G. Turner and Roger A. Knight serve as our audit committee.
 
    EXECUTIVE COMMITTEE
 
    James G. Turner, Roger A. Knight, Andreas Hildebrand, R.L. Gilmer and Jeff
    L. Hull serve as our executive committee.
 
    NON-EMPLOYEE DIRECTOR COMPENSATION
 
    Any member of our board of directors who is not an officer or employee does
    not receive compensation for serving on our board of directors. We
    anticipate compensating non-employee directors not affiliated with GEIPPPII
    or Ardshiel in the future for their service on our board.
 
                                       26
<PAGE>
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
    We are a wholly-owned subsidiary of Atrium Corp., which in turn is a
wholly-owned subsidiary of D and W Holdings, Inc. The following table sets forth
certain information regarding the beneficial ownership of D and W common stock
as of March 31, 1999, by each person who owns beneficially more than 5% of the
outstanding common stock of D and W and by the directors and certain executive
officers of D and W. Unless otherwise indicated below, to our knowledge, all
persons listed below have sole voting and investment power with respect to their
shares of common stock of D and W.
 
<TABLE>
<CAPTION>
NAME                                                                                 NUMBER OF SHARES    PERCENTAGE
-----------------------------------------------------------------------------------  -----------------  -------------
<S>                                                                                  <C>                <C>
GE Investment Private Placement Partners II, a Limited Partnership.................      92,970,561           90.7%
  3003 Summer Street
  Stamford, CT 06984-7900
Ardshiel, Inc......................................................................       6,643,600(1)         6.5%
  230 Park Avenue, Suite 2527
  New York, NY 10169
Randall S. Fojtasek................................................................       2,841,221(2)         2.8%
R.L. Gilmer........................................................................         480,159(3)        *
Louis W. Simi, Jr..................................................................         250,000(3)        *
Jeff L. Hull.......................................................................         125,000(3)        *
Cliff Darby........................................................................       1,059,000            1.0%
Sam A. Wing, Jr....................................................................              --             --
Daniel T. Morley...................................................................       6,643,600(4)         6.5%
James G. Turner....................................................................              --             --
Roger A. Knight....................................................................              --             --
Andreas Hildebrand.................................................................              --             --
John Deterding.....................................................................              --             --
Nimrod Natan.......................................................................              --             --
All directors and executive officers as a group (13 persons):......................      11,523,487           11.2%
</TABLE>
 
------------------------
 
*   less than 1%.
 
(1) Includes (i) 1,040,748 shares of D and W common stock issuable upon exercise
    of warrants that are currently exercisable; (ii) 1,819,033 shares of D and W
    common stock held by Ardatrium L.L.C., Arddoor L.L.C., Ardwing L.L.C. and
    Wing Partners, which are under common control with Ardshiel, and (iii)
    3,783,819 shares of Holdings common stock held by certain other stockholders
    of D and W who have granted proxies to Ardshiel or its affiliates to vote
    their shares.
 
(2) Includes 2,841,221 shares of D and W Holdings common stock issuable upon
    exercise of a warrant that is currently exercisable.
 
(3) Includes 125,000, 230,771 and 250,000 shares of D and W common stock
    issuable upon exercise of options granted to Messrs. Hull, Gilmer and Simi,
    respectively, under the New Plan. Such options are exercisable within 60
    days.
 
(4) Represents shares beneficially owned by Ardshiel and its affiliates. Mr.
    Morley is the President and a stockholder of Ardshiel and a managing member
    of Arddoor L.L.C., Ardatrium L.L.C. and Ardwing L.L.C., the general partner
    of Wing Partners. Accordingly, Mr. Morley may be deemed to be the beneficial
    owner of these shares. Mr. Morley disclaims beneficial ownership of these
    shares.
 
                                       27
<PAGE>
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
THE STOCKHOLDERS AGREEMENT
 
    GEIPPPII, Ardshiel, and certain other stockholders of D and W (collectively,
the "Major Stockholders"), have entered into a stockholders agreement, dated as
of October 2, 1998, which affects their relative rights as stockholders of D and
W.
 
    Pursuant to the stockholders agreement, the Major Stockholders have agreed
that the authorized number of directors of D and W shall consist of up to nine
directors. GEIPPPII, so long as it is a stockholder, shall have the right to
designate one director in the event there are less then seven directors, and two
directors in the event the Board of Directors consists of seven or more members.
The remainder of the directors shall be designated by Ardshiel, so long as it is
stockholder.
 
    Subject to certain exceptions, each of the Major Stockholders other than
GEIPPPII have agreed not to sell, transfer or otherwise dispose of such
stockholder's equity securities of D and W and an affiliate of Ardshiel has
agreed not to sell, transfer or otherwise dispose of its Discount Debentures. In
the event that GEIPPPII intends to transfer its equity securities or Discount
Debentures, each of the other Major Stockholders or holders of Discount
Debentures, will be entitled to require the purchaser of such equity securities
or Discount Debentures to purchase a pro rata portion of the equity securities
or Discount Debentures held by such Major Stockholder or holder of Discount
Debentures; PROVIDED, HOWEVER, that in the event such sale, transfer or
disposition by GEIPPPII occurs at any time following the fourth anniversary of
the stockholders agreement, the other stockholders or holders of Discount
Debentures, upon notice by GEIPPPII, will be obligated to sell all of their
equity securities and/or all of their Discount Debentures to the proposed
transferee. Subject to certain conditions, Ardshiel and its affiliates, may
require that GEIPPPII, at Ardshiel's or any of its affiliate's option, (i) sell
or otherwise dispose of its equity securities and Discount Debentures, in an
arm's length transaction to any person or persons who are not affiliates of
Ardshiel or (ii) purchase all of the other Major Stockholders' equity securities
and Discount Debentures for a purchase price provided in the stockholders
agreement. In addition, subject to certain exceptions, GEIPPPII and/or D and W
have the right to purchase from any selling Major Stockholder any or all equity
securities proposed to be sold to a third party by such selling Major
Stockholder.
 
    The stockholders agreement provides that in the event GEIPPPII or any
Ardshiel stockholder or any of their respective affiliates purchases from D and
W equity securities issued after the date of the stockholders agreement, Randall
Fojtasek and affiliates controlled by him shall be entitled to participate in
such investment on a pro rata basis (based on Mr. Fojtasek's relative ownership
of equity interests in D and W Holdings at the time of any such purchase). The
rights granted to Mr. Fojtasek described above may not be assigned to any
person, without the prior written consent of the parties to the stockholders
agreement.
 
    Pursuant to the terms of the stockholders agreement, D and W has granted the
Major Stockholders the right to require D and W, under certain circumstances, to
register under the Securities Act of 1933 any or all shares of D and W common
stock then held by such Major Stockholder and the right, in the event D and W or
any of its subsidiaries proposes to file, subject to certain exceptions, a
registration statement under the Securities Act with respect to any common stock
or equity security, to include in such registration statement for resale by the
Major Stockholders, such Major Stockholder's common stock.
 
    The stockholders agreement provides that D and W cannot take certain
enumerated actions without obtaining the prior written consent of GEIPPPII.
 
MANAGEMENT AGREEMENT
 
    We are a party to a management agreement dated October 2, 1998 with D and W,
Atrium Corp. and Ardshiel. Pursuant to the management agreement, Ardshiel
provides advice to D and W and its subsidiaries with respect to business
strategy, operations and budgeting and financial controls in exchange for an
annual fee of $1.3 million plus expenses. Additionally, the management agreement
provides that, prior to
 
                                       28
<PAGE>
engaging another financial advisor D and W or its subsidiary must offer Ardshiel
the opportunity to perform investment banking services in connection with a sale
or purchase of a business or any financing. Ardshiel shall receive a closing fee
for any such services which shall not be greater than 2% of the total purchase
or sale price for such business and shall be payable upon consummation of such
sale or such purchase. The consent of GEIPPPII is required prior to the payment
by D and W or any of its subsidiaries of any closing fees to Ardshiel where D
and W or any of its subsidiaries is paying similar fees to other entities for
similar services. D and W paid a closing fee of approximately $3.4 million upon
the consummation of the 1998 Recapitalization and paid Ardshiel's fees and
expenses in connection therewith. The management agreement will remain in effect
until October 2, 2008 and will be automatically renewed for one-year periods
unless either party gives written notice to the contrary at least thirty days
prior to the expiration of the initial or any extended term of the agreement
unless terminated earlier in accordance with its terms.
 
BUY-SELL AGREEMENTS
 
    D and W entered into buy-sell agreements with certain members of its
management pursuant to which D and W may, at its option, repurchase from those
persons all or any portion of their shares of D and W common stock upon the
termination of their employment. Each agreement provides that D and W shall
repurchase those shares at a purchase price equal to the greater of $1.00 per
share or the fair market value of the shares at the date of termination unless
the termination shall have been for cause, in which case the repurchase price
shall be equal to the lesser of the fair market value per share at the date of
termination and $1.00 per share. Each agreement also provides for certain
restrictions on transfer.
 
    In addition to the above, the buy-sell agreements entered into with Messrs.
Gilmer and Darby provide that the manager will have the right to require D and W
to repurchase his shares if he is terminated for any reason other than for cause
and D and W does not exercise its right to purchase the shares.
 
THE DISCOUNT DEBENTURES
 
    In 1998, Atrium Corp. issued $80.6 million aggregate principal amount at
maturity of its Discount Debentures to GEIPPPII and an affiliate of Ardshiel
(representing $45.0 million in gross proceeds to Atrium Corp.), to fund a
portion of the Atrium merger consideration, the repurchase of $25.0 million of
Atrium's existing senior subordinated notes and repayment of the intercompany
loan described below. See "Description of Certain Indebtedness--Discount
Debentures."
 
    D and W has agreed to cause
 
    - us to make dividend payments to Atrium Corp. to enable Atrium Corp. to
      make interest and principal payments on, or to repurchase, redeem or
      prepay (at par plus accreted value and unpaid interest), the Discount
      Debentures, to the extent we have funds legally available for the payment
      of such dividends and we are not prohibited from making such dividend
      payments by the terms of any contract to which we are a party (including,
      without limitation, the indenture relating to the Credit Facility) and
 
    - Atrium Corp., to the extent Atrium Corp. is not prohibited from doing so
      by the terms of any contract to which it or D and W is a party, to pay
      interest and principal on, or to repurchase, redeem or repay, the Discount
      Debentures from the proceeds of any such dividend payment.
 
    Subject to certain exceptions, an affiliate of Ardshiel has agreed not to
sell, transfer or otherwise dispose of its Discount Debentures. In addition,
such affiliate has certain rights and is subject to certain obligations in the
event of certain transfers by GEIPPPII of its Discount Debentures and is
entitled, under certain circumstances, to require GEIPPPII to sell or otherwise
dispose of its Discount Debentures and equity securities in an arm's length
transaction to any person or persons who are not affiliates of Ardshiel or
purchase such affiliate's Discount Debentures and equity securities. See "--The
Stockholders Agreement."
 
                                       29
<PAGE>
INTERCOMPANY LOAN
 
    In connection with the 1998 Recapitalization, Atrium Corp. issued to us a
$24.0 million subordinated intercompany note and we in turn used a portion of
the proceeds from our term loan under our credit facility to fund the
intercompany loan to Atrium Corp. The intercompany loan to Atrium Corp. bore
interest at a rate of 5.66% per annum computed semiannually. The intercompany
loan was repaid in November 1998 with proceeds from the issuance of Discount
Debentures.
 
INDEMNIFICATION AGREEMENTS
 
    We entered into indemnification agreements with Jeff L. Hull and Louis W.
Simi, Jr. under which we agreed to indemnify them to the fullest extent
permitted by law, and to advance expenses, if either of them becomes a party to
or witness or other participant in any threatened, pending or completed action,
suit or proceeding by reason of any occurrence related to the fact that the
person is or was our, our subsidiary's or, at our request, another entity's
director, officer, employee, agent or fiduciary, unless a reviewing party
(either outside counsel or a director or directors appointed by the Board of
Directors) determines that the person would not be entitled to indemnification
under applicable law. We expect to enter into similar indemnification agreements
with each of the remaining directors and executive officers.
 
FACILITY LEASES
 
    On July 3, 1995, Fojtasek Industrial Properties, Ltd., a limited partnership
in which Randall S. Fojtasek owns an equity interest of approximately 10.2%,
executed leases with us with respect to our Atrium Wood's and Atrium Vinyl's
facility and our H-R Windows division's facility. Both leases are absolute net
leases. These leases were extended on October 1, 1997 for a period of ten years,
expiring on July 1, 2008. The amounts paid under these two leases totaled
$1,245,281, $753,000 and $605,338 in 1998, 1997 and 1996, respectively.
Additionally, Fojtasek Interests, a Texas corporation, in which Mr. Fojtasek
owns an interest, subleases approximately 1,500 square feet of office space at
our corporate headquarters. Amounts paid to us under this lease in 1998 were
$19,588.
 
    Darby is a party to a facilities lease agreement with R.G. Darby, a former
stockholder of Darby and the father of Cliff Darby, President of Darby. Pursuant
to the terms of the lease, Darby pays rent to Mr. Darby of approximately $12,000
per month, adjusted annually for inflation. The term of the lease is fifteen
years with three extension terms of five years each. Rent expense paid to Mr.
Darby in 1998 was approximately $144,000.
 
                                       30
<PAGE>
                                    PART IV
 
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
 
(a) The following documents are included in this report.
 
    (1) FINANCIAL STATEMENTS:
 
       The financial statements are listed in the accompanying Index to
       Financial Statements on page F-1 of this report.
 
    (2) FINANCIAL STATEMENT SCHEDULES:
 
       The financial statement schedules are listed in the Index to Financial
       Statement Schedules on page S-1 of this report.
 
    (3) EXHIBITS
 
       The exhibits filed with or incorporated by reference in this report are
       listed in the Exhibit Index beginning on page E-1 of this report.
 
(b) REPORTS ON FORM 8-K
 
       The following reports on Form 8-K were filed by the Registrant during the
       fourth quarter:
 
           On October 19, 1998, in accordance with Items 1 and 7 of Form 8-K,
       the Company filed a report on Form 8-K announcing the completion of the
       merger between D and W Holdings, Inc., Atrium Corporation and D and W
       Acquisition Corp. on October 2, 1998. The report included the terms of
       the $205.0 million Credit Agreement entered into by the Company to
       finance the Transaction. The report also included the financial
       statements of the acquired businesses, the required pro forma financial
       information and certain exhibits required by Item 7 of Form 8-K.
 
                                       31
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
<TABLE>
<S>                             <C>  <C>
                                ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
                                By:               /s/ JEFF L. HULL
                                     -----------------------------------------
                                                    Jeff L. Hull
                                     EXECUTIVE VICE PRESIDENT, CHIEF FINANCIAL
                                     OFFICER, SECRETARY, TREASURER AND DIRECTOR
</TABLE>
 
Date: April 15, 1999
 
    Pursuant to the requirements of the Securities Act of 1934, this report has
been signed below by the following person on behalf of the registrant and in the
capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
          SIGNATURE                      CAPACITY                  DATE
------------------------------  --------------------------  -------------------
 
<C>                             <S>                         <C>
                                Executive Vice President,
                                  Chief Financial Officer,
       /s/ JEFF L. HULL           Secretary, Treasurer and
------------------------------    Director (co-Principal      April 15, 1999
         Jeff L. Hull             Executive Officer and
                                  Principal Financial
                                  Officer)
 
              *
------------------------------  Director (co-Principal        April 15, 1999
         R.L. Gilmer              Executive Officer)
 
              *                 Corporate Controller
------------------------------    (Principal Acounting        April 15, 1999
         Eric W. Long             Officer)
 
              *
------------------------------  Director                      April 15, 1999
       Daniel T Morley
 
              *
------------------------------  Director                      April 15, 1999
       Roger G. Knight
 
              *
------------------------------  Director                      April 15, 1999
       Sam A. Wing, Jr.
 
              *
------------------------------  Director                      April 15, 1999
       James G. Turner
</TABLE>
 
                                       32
<PAGE>
 
<TABLE>
<CAPTION>
          SIGNATURE                      CAPACITY                  DATE
------------------------------  --------------------------  -------------------
 
<C>                             <S>                         <C>
 
              *
------------------------------  Director                      April 15, 1999
         Nimrod Natan
 
              *
------------------------------  Director                      April 15, 1999
        John Deterding
 
              *
------------------------------  Director                      April 15, 1999
      Andreas Hildebrand
</TABLE>
 
    Jeff L. Hull, by signing his name hereto, signs and executes this document
on behalf of each of the above-named officers and directors of Atrium Companies,
Inc. on the 15th day of April, 1999, pursuant to powers of attorney executed on
behalf of each of such officers and directors, and contemporaneously filed
hereunto with the Securities and Exchange Commission.
 
<TABLE>
<S>   <C>                        <C>                         <C>
*By:      /s/ JEFF L. HULL
      -------------------------
            Jeff L. Hull
          ATTORNEY-IN-FACT
</TABLE>
 
Date: April 15, 1999
 
                                       33
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
ATRIUM COMPANIES, INC.
Report of Independent Accountants.........................................................................        F-2
  Consolidated Financial Statements:
  Consolidated Balance Sheets as of December 31, 1998 and 1997............................................        F-3
  Consolidated Statements of Operations for the year ended December 31, 1998, 1997 and the periods ended
    December 31, 1996 and October 25, 1996................................................................        F-4
  Consolidated Statements of Stockholders' Equity for the year ended December 31, 1998, 1997 and the
    periods ended December 31, 1996 and October 25, 1996..................................................        F-5
  Consolidated Statements of Cash Flows for the year ended December 31, 1998, 1997 and the periods ended
    December 31, 1996 and October 25, 1996................................................................        F-6
Notes to Consolidated Financial Statements................................................................        F-7
</TABLE>
 
                                      F-1
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholder of
Atrium Companies, Inc.:
 
In our opinion, the consolidated financial statements listed in the index
appearing under Item 14(a)1 and 2 of this Form 10-K present fairly, in all
material respects, the financial position of Atrium Companies, Inc. and its
subsidiaries at December 31, 1998 and 1997, and the results of their operations
and their cash flows for the years then ended and each of the two periods ended
December 31, 1996 and October 25, 1996, in conformity with generally accepted
accounting principles. 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 of these
statements in accordance with generally accepted auditing standards which
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, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for the opinion expressed above.
 
PricewaterhouseCoopers LLP
Dallas, Texas
April 4, 1999, except for Note 18, which is as of April 9, 1999.
 
                                      F-2
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                        DECEMBER 31,
                                                                                                    --------------------
                                                                                                      1998       1997
                                                                                                    ---------  ---------
<S>                                                                                                 <C>        <C>
CURRENT ASSETS:
  Cash and cash equivalents.......................................................................  $      --  $      34
  Equity securities--available for sale...........................................................        137         --
  Accounts receivable, net of allowance of $778 and $725, respectively............................     46,466      9,187
  Inventories.....................................................................................     46,289     13,557
  Prepaid expenses and other current assets.......................................................      7,756        832
  Deferred tax asset..............................................................................      1,249         --
                                                                                                    ---------  ---------
  Total current assets............................................................................    101,897     23,610
PROPERTY, PLANT AND EQUIPMENT, net................................................................     26,760      7,553
GOODWILL, net of amortization of $2,354 and $471, respectively....................................    214,749     22,394
DEFERRED FINANCING COSTS, net of amortization of $379 and $420, respectively......................     11,058      1,374
OTHER ASSETS......................................................................................      5,405        452
                                                                                                    ---------  ---------
  Total assets....................................................................................  $ 359,869  $  55,383
                                                                                                    ---------  ---------
                                                                                                    ---------  ---------
 
                                          LIABILITIES AND STOCKHOLDER'S EQUITY
 
CURRENT LIABILITIES:
  Current portion of notes payable................................................................      2,209      3,364
  Accounts payable................................................................................     25,353      6,438
  Accrued liabilities.............................................................................     15,432      2,517
  Deferred tax liability..........................................................................         --        566
                                                                                                    ---------  ---------
  Total current liabilities.......................................................................     42,994     12,885
LONG-TERM LIABILITIES:
  Notes payable...................................................................................    177,018     28,874
  Deferred tax liability..........................................................................          1        449
  Other long-term liabilities.....................................................................      6,800      2,500
                                                                                                    ---------  ---------
  Total long-term liabilities.....................................................................    183,819     31,823
                                                                                                    ---------  ---------
  Total liabilities...............................................................................    226,813     44,708
                                                                                                    ---------  ---------
COMMITMENTS AND CONTINGENCIES
STOCKHOLDER'S EQUITY:
  Common stock $.01 par value, 3,000 shares authorized, 100 shares issued and outstanding.........         --         --
  Class A voting common stock $.01 par value, 225,000 authorized; 25,501 issued and retired.......         --         --
  Class B nonvoting common stock $.01 par value, 100,000 authorized; 54,500 issued and retired....         --          1
  Paid-in capital.................................................................................    134,852      9,675
  Retained earnings (accumulated deficit).........................................................     (1,820)       999
  Accumulated other comprehensive income..........................................................         24         --
                                                                                                    ---------  ---------
  Total stockholder's equity......................................................................    133,056     10,675
                                                                                                    ---------  ---------
    Total liabilities and stockholder's equity....................................................  $ 359,869  $  55,383
                                                                                                    ---------  ---------
                                                                                                    ---------  ---------
</TABLE>
 
               The accompanying notes are an integral part of the
                       consolidated financial statements.
 
                                      F-3
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
             FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997 AND THE
              PERIODS ENDED DECEMBER 31, 1996 AND OCTOBER 25, 1996
 
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                       THE COMPANY                 PREDECESSOR
                                                         ----------------------------------------  ------------
                                                          YEAR ENDED    YEAR ENDED   PERIOD ENDED  PERIOD ENDED
                                                         DECEMBER 31,  DECEMBER 31,  DECEMBER 31,  OCTOBER 25,
                                                             1998          1997          1996          1996
                                                         ------------  ------------  ------------  ------------
<S>                                                      <C>           <C>           <C>           <C>
NET SALES..............................................   $  211,059    $   99,059    $   13,200    $   62,880
COST OF GOODS SOLD.....................................      159,140        78,270         9,927        47,311
                                                         ------------  ------------  ------------  ------------
  Gross profit.........................................       51,919        20,789         3,273        15,569
                                                         ------------  ------------  ------------  ------------
OPERATING EXPENSES:
  Selling, delivery, general and administrative
  expenses.............................................       39,754        15,671         2,242        13,271
  Amortization expense.................................        2,133           774           125            --
  Stock option compensation expense....................        3,851            --            --            --
                                                         ------------  ------------  ------------  ------------
                                                              45,738        16,445         2,367        13,271
                                                         ------------  ------------  ------------  ------------
    Income from operations.............................        6,181         4,344           906         2,298
INTEREST EXPENSE.......................................        9,081         2,953           374           509
OTHER INCOME, net......................................          571            --            --            --
                                                         ------------  ------------  ------------  ------------
  Income (loss) before income taxes and extraordinary
  charge...............................................       (2,329)        1,391           532         1,789
PROVISION (BENEFIT) FOR INCOME TAXES...................         (149)          695           229           670
                                                         ------------  ------------  ------------  ------------
  Income (loss) before extraordinary charge............       (2,180)          696           303         1,119
EXTRAORDINARY CHARGE ON EARLY RETIREMENT OF DEBT (net
  of income tax benefit of $392).......................          639            --            --            --
                                                         ------------  ------------  ------------  ------------
NET INCOME (LOSS)......................................   $   (2,819)   $      696    $      303    $    1,119
                                                         ------------  ------------  ------------  ------------
                                                         ------------  ------------  ------------  ------------
</TABLE>
 
                 The accompanying notes are an integral part of
                     the consolidated financial statements.
 
                                      F-4
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
                CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY
 FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997 AND THE PERIODS ENDED DECEMBER
                         31, 1996 AND OCTOBER 25, 1996
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                          COMMON STOCK                 CLASS A                    CLASS B
                                   --------------------------  ------------------------  --------------------------   TREASURY
                                     SHARES        AMOUNT        SHARES       AMOUNT       SHARES        AMOUNT         STOCK
                                   -----------  -------------  -----------  -----------  -----------  -------------  -----------
<S>                                <C>          <C>            <C>          <C>          <C>          <C>            <C>
PREDECESSOR
Balance, December 31, 1995.......          --     $      --           512    $     263           --     $      --     $    (156)
Net income.......................          --            --            --           --           --            --            --
Exercise of stock options........          --            --            59           30           --            --            --
Tax benefit related to option
  exercises......................          --            --            --           --           --            --            --
                                          ---           ---           ---        -----          ---           ---    -----------
Balance, October 25, 1996........          --     $      --           571    $     293           --     $      --     $    (156)
                                          ---           ---           ---        -----          ---           ---    -----------
                                          ---           ---           ---        -----          ---           ---    -----------
                                   ---------------------------------------------------------------------------------------------
                                   ---------------------------------------------------------------------------------------------
THE COMPANY
Balance, October 26, 1996........          --     $      --            --    $      --           --     $      --     $      --
Net income.......................          --            --            --           --           --            --            --
Initial issuance of common
  stock..........................          --            --            26           --           55             1            --
Issuance of warrants.............          --            --            --           --           --            --            --
                                          ---           ---           ---        -----          ---           ---    -----------
Balance, December 31, 1996.......          --            --            26           --           55             1            --
Net income.......................          --            --            --           --           --            --            --
Issuance of warrants.............          --            --            --           --           --            --            --
                                          ---           ---           ---        -----          ---           ---    -----------
Balance, December 31, 1997.......          --            --            26           --           55             1            --
Conversion of Wing's common stock
  to Atrium's common stock.......         100            --           (26)          --          (55)           (1)           --
Conversion of exchangeable
  subordinated note payable......          --            --            --           --           --            --            --
Step-up of Wing's assets due to
  purchase of minority
  interest.......................          --            --            --           --           --            --            --
Contribution of assets of Darby..          --            --            --           --           --            --            --
Capital contribution from Atrium
  Corp...........................          --            --            --           --           --            --            --
Stock option compensation
  expense........................          --            --            --           --           --            --            --
Exercise of stock options........          --            --            --           --           --            --            --
Comprehensive loss:
  Net loss.......................          --            --            --           --           --            --            --
  Unrealized gain on equity
    securities...................          --            --            --           --           --            --            --
                                          ---           ---           ---        -----          ---           ---    -----------
Total comprehensive loss.........
                                          ---           ---           ---        -----          ---           ---    -----------
Balance, December 31, 1998.......         100     $      --            --    $      --           --     $      --     $      --
                                          ---           ---           ---        -----          ---           ---    -----------
                                          ---           ---           ---        -----          ---           ---    -----------
 
<CAPTION>
                                                                            RETAINED
                                                                            EARNINGS          TOTAL
                                       ACCUMULATED OTHER       PAID-IN    (ACCUMULATED    STOCKHOLDER'S
                                     COMPREHENSIVE INCOME      CAPITAL      DEFICIT)         EQUITY
                                   -------------------------  ---------  ---------------  -------------
<S>                                <C>                        <C>        <C>              <C>
PREDECESSOR
Balance, December 31, 1995.......          $      --          $     233     $   4,171       $   4,511
Net income.......................                 --                 --         1,119           1,119
Exercise of stock options........                 --                409            --             439
Tax benefit related to option
  exercises......................                 --                253            --             253
                                                 ---          ---------       -------     -------------
Balance, October 25, 1996........          $                  $     895     $   5,290       $   6,322
                                                 ---          ---------       -------     -------------
                                                 ---          ---------       -------     -------------
 
THE COMPANY
Balance, October 26, 1996........          $      --          $      --     $      --       $      --
Net income.......................                 --                 --           303             303
Initial issuance of common
  stock..........................                 --              7,999            --           8,000
Issuance of warrants.............                 --              1,327            --           1,327
                                                 ---          ---------       -------     -------------
Balance, December 31, 1996.......                 --              9,326           303           9,630
Net income.......................                 --                 --           696             696
Issuance of warrants.............                 --                349            --             349
                                                 ---          ---------       -------     -------------
Balance, December 31, 1997.......                 --              9,675           999          10,675
Conversion of Wing's common stock
  to Atrium's common stock.......                 --                  1            --              --
Conversion of exchangeable
  subordinated note payable......                 --             11,375            --          11,375
Step-up of Wing's assets due to
  purchase of minority
  interest.......................                 --              1,247            --           1,247
Contribution of assets of Darby..                 --             13,147            --          13,147
Capital contribution from Atrium
  Corp...........................                 --             95,340            --          95,340
Stock option compensation
  expense........................                 --              3,851            --           3,851
Exercise of stock options........                 --                216            --             216
Comprehensive loss:
  Net loss.......................                 --                 --        (2,819)         (2,819)
  Unrealized gain on equity
    securities...................                 24                 --            --              24
                                                 ---          ---------       -------     -------------
Total comprehensive loss.........                 24                           (2,819)         (2,795)
                                                 ---          ---------       -------     -------------
Balance, December 31, 1998.......          $      24          $ 134,852     $  (1,820)      $ 133,056
                                                 ---          ---------       -------     -------------
                                                 ---          ---------       -------     -------------
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                  statements.
 
                                      F-5
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
               FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997 AND
            THE PERIODS ENDED DECEMBER 31, 1996 AND OCTOBER 25, 1996
                             (DOLLARS IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                             THE COMPANY
                                                                             -------------------------------------------
                                                                              YEAR ENDED     YEAR ENDED    PERIOD ENDED
                                                                             DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                                                 1998           1997           1996
                                                                             -------------  -------------  -------------
<S>                                                                          <C>            <C>            <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income (loss)........................................................   $    (2,819)    $     696      $     303
  Adjustments to reconcile net income (loss) to net cash flows from
    operating activities:
  Extraordinary charge, net of income tax benefit..........................           639            --             --
  Depreciation and amortization............................................         4,158         1,492            260
  Stock option compensation expense........................................         3,851            --             --
  Amortization of deferred financing costs.................................           732           390             30
  Accretion of discount on exchangeable subordinated notes payable.........           105           113             33
  Provision for bad debts..................................................           227         1,791            287
  Gain on sale of assets...................................................           (12)           --             --
  Deferred tax provision (benefit).........................................           358           184             60
  Changes in assets and liabilities, net of acquisitions:
    Accounts receivable....................................................        (1,751)       (1,949)           582
    Inventories............................................................       (12,297)       (2,990)          (229)
    Prepaid expenses and other current assets..............................        (2,142)         (166)            93
    Accounts payable.......................................................         4,859           354           (462)
    Accrued liabilities....................................................        (3,932)        1,233            155
                                                                             -------------  -------------  -------------
      Net cash provided by (used in) operating activities..................        (8,024)        1,148          1,112
                                                                             -------------  -------------  -------------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property, plant and equipment...............................        (2,221)       (1,355)          (122)
  Proceeds from sales of assets............................................            12            --             --
  Acquisition of Atrium, net of cash acquired and debt and accrued interest
    assumed................................................................      (120,977)           --             --
  Acquisition of the Door Division of Super Millwork.......................            --       (10,408)            --
  Acquisition of Wing, net of cash acquired................................            --            --        (29,143)
  Other assets.............................................................        (1,998)           --             --
                                                                             -------------  -------------  -------------
      Net cash used in investing activities................................      (125,184)      (11,763)       (29,265)
                                                                             -------------  -------------  -------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from borrowings under term notes................................       145,930            --             --
  Payment of notes payable.................................................       (29,563)       (1,032)            --
  Payment of senior subordinated notes.....................................       (70,930)          (70)            --
  Net borrowings under revolving credit facility...........................         4,118         1,497          2,951
  Proceeds from issuance of exchangeable subordinated notes................            --         3,960             --
  Proceeds from issuance of notes payable..................................            --         6,790         18,500
  Deferred financing costs.................................................       (11,437)         (536)        (1,258)
  Capital contributions....................................................            --            --          8,000
  Scheduled principal payments on term notes...............................          (500)           --             --
  Contributions from Atrium Corp...........................................        95,340            --             --
  Exercise of stock options................................................           216            --             --
                                                                             -------------  -------------  -------------
      Net cash provided by financing activities............................       133,174        10,609         28,193
                                                                             -------------  -------------  -------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS.......................           (34)           (6)            40
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD.............................            34            40             --
                                                                             -------------  -------------  -------------
CASH AND CASH EQUIVALENTS, END OF PERIOD...................................   $        --     $      34      $      40
                                                                             -------------  -------------  -------------
                                                                             -------------  -------------  -------------
SUPPLEMENTAL DISCLOSURE:
  Cash paid during the period for:
    Interest...............................................................   $    11,765     $   2,620      $     167
    Income taxes, net of refunds...........................................           536           550             --
  Noncash investing and financing activities:
    Conversion of exchangeable subordinated notes payable..................        11,375            --             --
    Contribution of Darby's assets.........................................        13,147            --             --
    Step-up of Wing's assets due to purchase of minority interest..........         1,247            --             --
    Purchase of equipment under capital leases.............................            20           840             --
    Payable to seller......................................................            --         2,500             --
    Issuance of common stock warrants......................................            --            --            332
    Tax benefit related to option exercises................................            --            --             --
 
<CAPTION>
                                                                              PREDECESSOR
                                                                             -------------
                                                                             PERIOD ENDED
                                                                              OCTOBER 25,
                                                                                 1996
                                                                             -------------
<S>                                                                          <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income (loss)........................................................    $   1,119
  Adjustments to reconcile net income (loss) to net cash flows from
    operating activities:
  Extraordinary charge, net of income tax benefit..........................           --
  Depreciation and amortization............................................          716
  Stock option compensation expense........................................           --
  Amortization of deferred financing costs.................................           --
  Accretion of discount on exchangeable subordinated notes payable.........           --
  Provision for bad debts..................................................        1,274
  Gain on sale of assets...................................................           --
  Deferred tax provision (benefit).........................................          (71)
  Changes in assets and liabilities, net of acquisitions:
    Accounts receivable....................................................       (2,116)
    Inventories............................................................         (621)
    Prepaid expenses and other current assets..............................          219
    Accounts payable.......................................................          253
    Accrued liabilities....................................................         (109)
                                                                             -------------
      Net cash provided by (used in) operating activities..................          664
                                                                             -------------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property, plant and equipment...............................         (962)
  Proceeds from sales of assets............................................           --
  Acquisition of Atrium, net of cash acquired and debt and accrued interest
    assumed................................................................           --
  Acquisition of the Door Division of Super Millwork.......................           --
  Acquisition of Wing, net of cash acquired................................           --
  Other assets.............................................................           28
                                                                             -------------
      Net cash used in investing activities................................         (934)
                                                                             -------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from borrowings under term notes................................           --
  Payment of notes payable.................................................       (2,492)
  Payment of senior subordinated notes.....................................           --
  Net borrowings under revolving credit facility...........................        2,122
  Proceeds from issuance of exchangeable subordinated notes................           --
  Proceeds from issuance of notes payable..................................           --
  Deferred financing costs.................................................           --
  Capital contributions....................................................          439
  Scheduled principal payments on term notes...............................           --
  Contributions from Atrium Corp...........................................           --
  Exercise of stock options................................................           --
                                                                             -------------
      Net cash provided by financing activities............................           69
                                                                             -------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS.......................         (161)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD.............................          161
                                                                             -------------
CASH AND CASH EQUIVALENTS, END OF PERIOD...................................    $      --
                                                                             -------------
                                                                             -------------
SUPPLEMENTAL DISCLOSURE:
  Cash paid during the period for:
    Interest...............................................................    $     510
    Income taxes, net of refunds...........................................          927
  Noncash investing and financing activities:
    Conversion of exchangeable subordinated notes payable..................           --
    Contribution of Darby's assets.........................................           --
    Step-up of Wing's assets due to purchase of minority interest..........           --
    Purchase of equipment under capital leases.............................           --
    Payable to seller......................................................           --
    Issuance of common stock warrants......................................           --
    Tax benefit related to option exercises................................          253
</TABLE>
 
   The accompanying notes are an integral part of the consolidated financial
                                   statements
 
                                      F-6
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
1. ORGANIZATION, BUSINESS AND BASIS OF PRESENTATION:
 
    Atrium Companies, Inc. (the "Company") is engaged in the manufacture and
sale of doors, windows and various building materials throughout the United
States.
 
    Prior to October 2, 1998, the Company's historical financial statements as
previously filed with the Securities and Exchange Commission included its
operations and the operations of its wholly-owned subsidiaries, Atrium Door and
Window Company of the Northeast, Atrium Door and Window Company of New England,
Atrium Door and Window Company of New York (collectively "ADW--Northeast"),
Atrium Door and Window Company--West Coast ("ADW--West Coast") and Atrium Door
and Window Company of Arizona ("ADW--Arizona"). On October 2, 1998, pursuant to
an acquisition and merger (the "Recapitalization" or "reverse acquisition") as
more fully described in Note 3, the Company's indirect Parent (D and W Holdings,
Inc.) contributed the assets of Wing Industries Holdings, Inc. and its
subsidiary Wing Industries, Inc. (collectively "Wing") and Door Holdings, Inc.
and its subsidiaries R.G. Darby Company, Inc. and Total Trim, Inc. (collectively
"Darby") to the Company.
 
    As Wing was determined to be the acquiror in the reverse acquisition, the
historical financial statements of the Company (prior to October 3, 1998) were
replaced with the historical financial statements of Wing. As a result, the
statement of operations for 1998 only includes the operations of the Company and
Darby from October 3 through December 31. The statements of operations for the
year ended December 31, 1997, the periods ended December 31, 1996 and October
25, 1996 only include the operations and accounts of Wing and its predecessor.
Wing was acquired by the current controlling shareholders on October 25, 1996.
The December 31, 1998 balance sheet includes the accounts of the Company, Wing,
Darby and each of their respective subsidiaries. The December 31, 1997 balance
sheet only includes the accounts of Wing.
 
    Following is a comparison of the actual results for the Company, Wing and
Darby prior to October 3, 1998, to unaudited pro forma information for the same
period assuming the reverse acquisition had taken place as of January 1, 1997:
 
<TABLE>
<CAPTION>
                                               YEAR ENDED DECEMBER 31,   YEAR ENDED DECEMBER 31,
                                                         1998                      1997
                                               ------------------------  ------------------------
                                                 ACTUAL      PRO FORMA     ACTUAL      PRO FORMA
                                               -----------  -----------  -----------  -----------
<S>                                            <C>          <C>          <C>          <C>
Net sales....................................   $ 211,059    $ 400,777    $  99,059    $ 357,870
Income (loss) before income taxes and
  extraordinary charge.......................      (2,329)       7,464        1,391        5,827
Income (loss) before extraordinary charge....      (2,180)       2,821          696        1,844
Net income (loss)............................      (2,819)       2,821          696        1,844
 
Depreciation, amortization and stock option
  compensation expense.......................       8,009       18,632        1,492       11,026
Interest expense.............................       9,081       17,506        2,953       23,963
</TABLE>
 
    The references to the periods ended December 31, 1996 and October 25, 1996
used throughout these consolidated financial statements, refer to the periods
October 26, 1996 through December 31, 1996 and January 1, 1996 through October
25, 1996, respectively.
 
                                      F-7
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
2. SIGNIFICANT ACCOUNTING POLICIES:
 
    BASIS OF CONSOLIDATION
 
    The consolidated financial statements include the accounts of the Company
and its wholly-owned subsidiaries. All significant intercompany transactions and
balances have been eliminated in consolidation.
 
    INDUSTRY SEGMENT
 
    The Company operates in a single industry segment, the fabrication,
distribution and installation of doors and windows and related components.
 
    REVENUE RECOGNITION
 
    Revenue from the sale of doors and windows and related components is
recorded at the time of delivery to the customer. Allowances are established to
recognize the risk of sales returns from customers and estimates of warranty
costs.
 
    CASH AND CASH EQUIVALENTS
 
    The Company considers all highly-liquid investments with original maturities
of three months or less to be cash equivalents. At December 31, 1998, the
Company had $4,012 of bank overdrafts that were reclassified into Accounts
Payable.
 
    EQUITY SECURITIES--AVAILABLE FOR SALE
 
    Investments in equity securities--available for sale are carried at market
based on quoted market prices, with unrealized gains (losses) recorded in
stockholder's equity.
 
    CONCENTRATIONS OF CREDIT RISK
 
    Financial instruments, which potentially expose the Company to
concentrations of credit risk, consist primarily of trade accounts receivable.
The Company's customers are located in all 50 states and in 6 different
countries. The Company performs ongoing credit evaluations of its customers'
financial condition and generally requires no collateral. The Company
establishes an allowance for doubtful accounts based upon factors surrounding
the credit risk of specific customers, historical trends and other information.
Two customers accounted for approximately 58% and 65% of gross sales for 1998
and 1997 and 55% for the periods ended December 31, 1996 and October 25, 1996,
respectively.
 
    INVENTORIES
 
    Inventories are valued at the lower of cost (last-in, first-out or "LIFO")
or market. Work-in- process and finished goods inventories consist of materials,
labor and manufacturing overhead. Inventory costs include direct materials,
labor and manufacturing overhead. Management believes that the LIFO method
results in a better matching of current costs with current revenues.
 
                                      F-8
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
2. SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
    PROPERTY, PLANT AND EQUIPMENT
 
    Property, plant and equipment is stated at cost less accumulated
depreciation. The Company depreciates the assets principally on a straight-line
basis for financial reporting purposes over their estimated useful lives, as
follows:
 
<TABLE>
<CAPTION>
                                                                                ESTIMATED
                                                                               USEFUL LIFE
                                                                               -----------
<S>                                                                            <C>
Buildings and improvements...................................................   5-40 years
Machinery and equipment......................................................   3-12 years
</TABLE>
 
    Gains or losses on disposition are based on the net proceeds and the
adjusted carrying amount of the assets sold or retired. Expenditures for
maintenance, minor renewals and repairs are expensed as incurred, while major
replacements and improvements are capitalized.
 
    GOODWILL
 
    Goodwill represents the excess of cost over fair market value of net assets
acquired. Goodwill is being amortized over 40 years on a straight-line basis.
Management continually reviews the carrying value of goodwill for recoverability
based on anticipated undiscounted cash flows of the assets to which it relates.
The Company considers operating results, trends and prospects of the Company, as
well as competitive comparisons. The Company also takes into consideration
competition within the building materials industry and any other events or
circumstances which might indicate potential impairment. When goodwill is
determined not to be recoverable, an impairment is recognized as a charge to
operations.
 
    CAPITALIZED SOFTWARE COSTS
 
    The Company capitalizes internal employee costs and external consulting
costs associated with implementing and developing software for internal use.
Internal costs capitalized include payroll and payroll-related costs for
employees who are directly associated with the development, modification and
implementation of the software. External costs include direct expenses related
to consulting and other professional fees consumed in developing, modifying and
implementing the software. Capitalization of costs occurs upon the completion of
the preliminary project stage and when management believes it is probable a
project will be completed and the software will be used to perform the function
intended. Amortization begins when the software is put into place and is
calculated on a straight-line basis over three years. Management continually
reviews the carrying value and expected functionality of the accumulated costs
for potential impairment. When it is no longer probable that computer software
being developed will be completed, modified or placed in service, the assets
carrying value will be adjusted to the lower of cost or fair value.
 
    Unamortized capitalized software costs at December 31, 1998 and 1997 were
$3,665 and $0, respectively. Amortization expense for 1998 was $304.
 
    INCOME TAXES
 
    The provision for income taxes is based on pretax income as reported for
financial statement purposes. Deferred income taxes are provided in accordance
with the liability method of accounting for
 
                                      F-9
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
2. SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
income taxes to recognize the tax effects of temporary differences between
financial statement and income tax accounting.
 
    FORWARD COMMITMENTS
 
    The Company periodically enters into forward commitments to hedge price
variances in materials. Changes in the market value of forward commitments are
recognized in income when the effects of the related charges in the hedged items
are recognized.
 
    USE OF ESTIMATES
 
    The preparation of consolidated 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 dates of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results could differ from these estimates. Significant
estimates are used in calculating bad debt, workers' compensation and warranty
accruals, and in recognizing deferred tax assets and liabilities.
 
    ADVERTISING COSTS
 
    Advertising costs are expensed when incurred and were $2,841, $1,800, $128
and $1,222 for 1998 and 1997 and the periods ended December 31, 1996 and October
25, 1996, respectively. These costs are reflected in "selling, delivery, general
and administrative" in the consolidated statements of operations.
 
    OTHER COMPREHENSIVE INCOME
 
    In June 1997, the Financial Accounting Standards Board ("FASB") issued
Statement of Financial Accounting Standards No. 130 ("FAS 130") "Reporting
Comprehensive Income." FAS 130 requires that all items that are required to be
recognized under accounting standards as components of comprehensive income be
reported in a financial statement that is displayed with the same prominence as
other financial statements. FAS 130 is effective for financial statement periods
beginning after December 15, 1997. The Company adopted FAS 130 beginning January
1, 1998. The Company had no comprehensive income for all periods presented prior
to January 1, 1998.
 
    RECENT ACCOUNTING PRONOUNCEMENTS
 
    In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants ("AcSEC") Issued Statement of Position
98-1 ("SOP 98-1") "Accounting for the Costs of Computer Software Developed or
Obtained for Internal Use" that is effective for reporting periods beginning
after December 15, 1998, but provides for earlier application if certain
conditions are met. The Company has applied the provisions of SOP 98-1 in its
financial statements for the year ended December 31, 1998 and its adoption had
no material effect on the Company's consolidated financial position or results
of operations.
 
    In June 1998, the FASB issued Statement of Financial Accounting Standards
No. 133 ("FAS 133") "Accounting for Derivative Instruments and Hedging
Activities" that is effective for all fiscal quarters of fiscal years beginning
after June 15, 1999. The Company will implement the provisions of FAS 133 as
 
                                      F-10
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
2. SIGNIFICANT ACCOUNTING POLICIES: (CONTINUED)
required. The future adoption of FAS 133 in not expected to have a material
effect on the Company's consolidated financial position or results of
operations.
 
    RECLASSIFICATIONS
 
    Certain reclassifications have been made to the 1997 and 1996 balances to
conform to the 1998 presentation.
 
3. THE REVERSE ACQUISITION (RECAPITALIZATION):
 
    On August 3, 1998, D and W Holdings, Inc. ("Parent"), entered into an
Agreement and Plan of Merger (the "Merger Agreement") with Atrium Corporation
("Corp"), the parent company of the Company and other necessary parties to
acquire all of the outstanding capital stock of Corp for $225.0 million, through
a series of transactions (the "Recapitalization") described below. Corp owned
100% of the outstanding capital stock of the Company prior to the Merger
discussed below. GE Investment Private Placement Partners II, a limited
partnership ("GEIPPPII"), and Ardatrium L.L.C. ("Ardatrium") formed Parent by
acquiring all of its outstanding common stock for an aggregate purchase price of
$50.0 million. GEIPPPII is a private equity partnership affiliated with GE
Investments, a wholly-owned investment management subsidiary of General Electric
Company. Ardatrium is an affiliate of Ardshiel, Inc. ("Ardshiel"), a private
equity investment firm based in New York.
 
    The acquisition of Corp by Parent was effected through the merger on October
2, 1998 of a wholly owned subsidiary of Parent, with and into Corp (the
"Merger") pursuant to the terms of the Merger Agreement. Prior to the Merger,
Parent contributed $50.0 million to the wholly-owned subsidiary in exchange for
all of its outstanding common stock. As a result of the Merger, Corp became a
direct wholly-owned subsidiary of Parent, and the Company became an indirect
wholly owned subsidiary of Parent.
 
    Prior to the Merger, GEIPPPII and Ardshiel held investments in debt and
equity securities of Wing and Darby. Immediately prior to the consummation of
the Merger, all of the outstanding subordinated debt and associated warrants to
purchase common stock of Wing and Darby were converted into common stock of Wing
and Darby, respectively. The stockholders of Wing and Darby contributed their
common stock in Wing and Darby to Parent in exchange for common stock of Parent.
Immediately after the consummation of the Merger, Parent contributed all of the
common stock of Wing and Darby to Corp, which in turn contributed such stock to
the Company.
 
    Upon completion of the Recapitalization, GEIPPPII and Ardshiel and its
affiliates beneficially owned approximately 96.7% of the outstanding common
stock of Parent with management owning the remaining 3.3%.
 
    Pursuant to the terms of the Merger Agreement, all of the outstanding equity
securities of Corp were converted into the right to receive the merger
consideration of $94.2 million (the "Merger Consideration") in cash, net of
transaction costs of $5.4 million, outstanding indebtedness of $122.7 million
and $2.7 million of equity securities of Corp, owned by certain members of
management of Corp, which were converted into comparable equity securities of
Parent. The Merger Consideration was funded with (i) the $50.0 million in cash
that became an asset of Corp in the Merger, (ii) $20.0 million in cash proceeds
from the issuance of Senior Discount Debentures due 2010 by Corp. to GEIPPPII
and Ardatrium (the "Discount Debentures"), (iii) approximately $24.0 million in
cash proceeds from a loan from the Company (the
 
                                      F-11
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
3. THE REVERSE ACQUISITION (RECAPITALIZATION): (CONTINUED)
"Intercompany Loan") which was funded by a portion of the proceeds of a term
loan to the Company under the Credit Facility (see Note 9), and (iv) $0.2
million in cash proceeds from the issuance of common stock of Parent to certain
members of management of Corp followed by a capital contribution of such
proceeds by Parent to Corp.
 
    The acquisition of Corp by Parent and the Merger was accounted for as a
reverse acquisition. As Wing's shareholder group received the largest ownership
interest in Parent, Wing was determined to be the "accounting acquiror" in the
reverse acquisition. As a result, purchase accounting was applied to the assets
and liabilities of the Company. The purchase price was allocated to the
Company's assets and liabilities as follows:
 
<TABLE>
<S>                                                         <C>
Equity securities available for sale......................  $     113
Accounts receivable.......................................     32,097
Inventories...............................................     18,766
Prepaid expenses and other current assets.................      4,506
Deferred tax asset........................................      2,268
Property, plant and equipment.............................     18,391
Other noncurrent assets...................................      3,326
Goodwill..................................................    170,447
Current liabilities.......................................    (24,614)
Other long-term liabilities...............................       (300)
                                                            ---------
Total purchase price......................................  $ 225,000
                                                            ---------
                                                            ---------
</TABLE>
 
    The purchase price includes cash paid of $120,977, including the retirement
of certain indebtedness, and the assumption of debt and accrued interest
$104,023
 
    The purchase method of accounting was also applied to the net assets of Wing
and Darby to the extent minority interest was acquired. Goodwill was increased
by $1,247 and $242 for Wing and Darby, respectively.
 
4. ACQUISITION OF DOOR DIVISION OF SUPER MILLWORK, INC.
 
    On November 10, 1997, Wing purchased certain assets of the Door Division of
Super Millwork, Inc. (SMI), a New York corporation for $12,500, including
contingent payments of $2,500 based on future operating results. The total cost
of the acquisition including transaction costs incurred aggregated $13,444. The
purchase price was funded with borrowings under a line of credit of
approximately $194, term loan borrowings of $6,750 and the issuance of
exchangeable subordinated notes of $4,000 with warrants.
 
                                      F-12
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
4. ACQUISITION OF DOOR DIVISION OF SUPER MILLWORK, INC. (CONTINUED)
    The purchase price allocation is as follows:
 
<TABLE>
<S>                                                          <C>
Accounts receivable........................................  $   1,791
Inventories................................................      2,540
Other current assets.......................................         31
Property, plant and equipment..............................        215
Other noncurrent assets....................................        300
Deferred financing costs...................................        536
Goodwill...................................................      9,945
Current liabilities........................................     (1,914)
                                                             ---------
Total purchase price.......................................  $  13,444
                                                             ---------
                                                             ---------
</TABLE>
 
5. FAIR VALUE OF FINANCIAL INSTRUMENTS:
 
    In accordance with Statement of Financial Accounting Standards No. 107 ("FAS
107") "Disclosures About Fair Value of Financial Instruments," the following
methods have been used in estimating fair value disclosures for significant
financial instruments of the Company.
 
    Estimated fair value amounts have been determined by the Company using
available market information and appropriate valuation methodologies. Due to the
fact that considerable judgment is required to interpret market data to develop
the estimates of fair value, the estimates presented are not necessarily
indicative of the amounts that could be realized in a current market exchange.
 
    Cash and cash equivalents--The carrying amounts reported in the balance
    sheet approximate the fair value.
 
    Equity securities--available for sale--The carrying amounts that are
    reported in the balance sheet approximate the fair value based on quoted
    market prices.
 
    Notes payable--The fair value of the Company's notes is based on quoted
    market prices. The carrying value of notes payable, other than the
    exchangeable subordinated notes and the senior subordinated notes,
    approximate fair value due to the floating nature of the interest rates.
    Management estimates that the effective interest rate for the exchangeable
    subordinated note approximates market for similar instruments with
    comparable maturities. The senior subordinated notes of $29,070 are valued
    at $29,361 as of December 31, 1998 based on quoted market prices.
 
    Interest Rate Swaps--The Company has entered into two interest rate swap
    agreements whereby the Company will pay the counterparties interest at a
    fixed rate and the counterparties will pay the Company interest at a
    floating rate equal to the three-month LIBOR interest rate. The fair value
    of
 
                                      F-13
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
5. FAIR VALUE OF FINANCIAL INSTRUMENTS: (CONTINUED)
    interest rate swap agreements is the amount at which they could be settled,
    based on estimates obtained from lenders. Swaps consisted of the following
    at December 31:
 
<TABLE>
<CAPTION>
                                                                                   1998         1997
                                                                               ------------  -----------
<S>                                                                            <C>           <C>
Swap #1
  Notional Amount............................................................  $    1,406    $   2,531
  Fixed Interest Rate........................................................        6.50%        6.50%
  Termination Date...........................................................     3/31/00      3/31/00
  Unrealized Gain/(Loss).....................................................  $      (15)          --
 
Swap #2
  Notional Amount............................................................  $    2,827           --
  Fixed Interest Rate........................................................        6.25%          --
  Termination Date...........................................................     11/6/03           --
  Unrealized Gain/(Loss).....................................................  $      (87)          --
</TABLE>
 
    Forward aluminum contracts--The unrealized gains and losses are based on
    quotes for aluminum as reported on the London Metal Exchange. As of December
    31, 1998, the Company had forward contracts with fixed rate prices totaling
    $2,623 with an unrealized loss of $199.
 
6. INVENTORIES:
 
    Inventories consisted of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                            1998       1997
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Raw materials...........................................................  $  27,362  $   6,816
Work-in-process.........................................................      4,129      1,591
Finished goods..........................................................     13,486      5,247
                                                                          ---------  ---------
                                                                             44,977     13,654
LIFO reserve............................................................      1,312        (97)
                                                                          ---------  ---------
                                                                          $  46,289  $  13,557
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
    The change in the LIFO reserve for 1998 and 1997, resulted in a decrease in
cost of sales of $1,409 and an increase in cost of sales of $95, respectively
and a decrease in cost of sales for the periods ended December 31, 1996 and
October 26, 1996 of $2 and $360, respectively.
 
                                      F-14
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
7. PROPERTY, PLANT AND EQUIPMENT:
 
    Property, plant and equipment consisted of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                            1998       1997
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Land....................................................................  $   1,303  $      40
Buildings and improvements..............................................      8,671      1,812
Machinery and equipment.................................................     19,311      6,974
Construction-in-process.................................................        722         --
                                                                          ---------  ---------
  Total.................................................................     30,007      8,826
Less accumulated depreciation and amortization..........................     (3,247)    (1,273)
                                                                          ---------  ---------
                                                                          $  26,760  $   7,553
                                                                          ---------  ---------
                                                                          ---------  ---------
</TABLE>
 
    Depreciation expense was $1,996, $1,180, $165 and $716 for 1998 and 1997,
and the periods ended December 31, 1996 and October 25, 1996, respectively.
 
8. DEFERRED FINANCING COSTS:
 
    The deferred financing costs relate to costs incurred in the placement of
the Company's debt and are being amortized using the effective interest method
over the terms of the related debt, which range from five to ten years.
Amortization expense for 1998 and 1997 and for the period ended December 31,
1996 was $732, $390 and $30, respectively and was recorded as interest expense
in the accompanying consolidated statements of operations. No amortization
expense was recorded for the period ended October 25, 1996.
 
    The Company wrote off deferred financing costs of $639, net of income tax
benefit of $392, in connection with the Recapitalization.
 
                                      F-15
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
9. NOTES PAYABLE:
 
    Notes payable consisted of the following at December 31:
 
<TABLE>
<CAPTION>
                                                                                      1998       1997
                                                                                   ----------  ---------
<S>                                                                                <C>         <C>
$100,000 Senior Subordinated Notes, due November 15, 2006, with semiannual
  interest payments of 10 1/2% due May 15 and November 15........................  $   29,070  $      --
 
Revolving credit facility........................................................       4,118
 
$75,000 Term Loan B, due June 30, 2005 with $250 quarterly payments, interest at
  either the administrative agent's base rate plus an applicable margin or LIBOR
  plus an applicable margin (9.625% at December 31, 1998)........................      74,750         --
 
$70,930 Term Loan C, due June 30, 2006, with $250 quarterly payments, interest at
  either the administrative agent's base rate plus an applicable margin or LIBOR
  plus an applicable margin (9.875% at December 31, 1998)........................      70,680         --
 
Other notes payable..............................................................         609        770
 
$14,500 revolving line of credit with BHF-Bank, bearing interest at bank's base
  rate (which approximate prime) plus one and one-half percent (10% at December
  31, 1997)......................................................................          --      4,448
 
$6,750 note payable to BHF-Bank, due in quarterly installments of $219 through
  September 30, 2002 and $591 through maturity, November 6, 2003, plus interest
  at the base rate (which approximates prime) plus one and one-half percent (10%
  at December 31, 1997)..........................................................          --      6,750
 
$4,000 exchangeable subordinated note payable to GEIPPPII and Ardwing L.L.C.,
  payable interest only in quarterly installments at 11%, due November 10, 2004,
  exchangeable into approximately 22,126 shares of common stock..................          --      4,000
 
$10,000 note payable to BHF-Bank, due in quarterly installments of $250 through
  September 30, 1997 and $562 through maturity, October 25, 2001, plus interest
  at the base rate (which approximates prime) plus one and one-half percent (10%
  at December 31, 1997)..........................................................          --      9,000
 
$8,500 exchangeable subordinated note payable to GEIPPPII, payable interest only
  in quarterly installments at 11%, due October 25, 2003, exchangeable into
  approximately 46,669 shares of common stock....................................          --      8,500
                                                                                   ----------  ---------
 
                                                                                      179,227     33,468
 
Less:
 
  Unamortized discount on exchangeable subordinated notes payable................          --     (1,230)
 
  Current maturities of long-term debt...........................................      (2,209)    (3,364)
                                                                                   ----------  ---------
 
    Long-term debt...............................................................  $  177,018  $  28,874
                                                                                   ----------  ---------
                                                                                   ----------  ---------
</TABLE>
 
                                      F-16
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
9. NOTES PAYABLE: (CONTINUED)
    The Company's exchangeable subordinated notes payable, notes payable to
banks and revolving line of credit existing at December 31, 1997 and through
October 2, 1998, were repaid or converted in connection with the
Recapitalization.
 
    The note agreements existing prior to the merger contained certain
covenants, including, among others, requirements that the Company comply with
certain financial and operational results and ratios. In addition, the loan
agreements placed certain limitations on the ability to pay dividends, to incur
indebtedness, to change its present method of doing business, to make certain
investments (including capital expenditures) or to sell assets. Substantially
all of Wing's assets and capital stock were collateralized under the BHF-Bank
agreements. The $10,000 and $6,750 term loans contained "excess cash flow"
provisions mandating additional principal payments if certain cash flow targets
were met during each fiscal year. No additional principal payments were required
as of December 31, 1997.
 
    The Company entered into a Credit Agreement (the "Credit Agreement"), dated
as of October 2, 1998 with Bank Boston, as administrative agent (the
"Administrative Agent") and Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner &
Smith Incorporated, as lead arranger, syndication agent and documentation agent.
 
    The Credit Agreement provides for three separate facilities (the
"Facilities") consisting of two term loans (referred to individually as "Term
Loan B" and "Term Loan C", and collectively as the "Term Loans") and a revolving
credit facility with a letter of credit sub-facility (the "Revolving Facility",
together with the Term Loans, the "Loans"). The Revolving Facility is in the
amount of $30,000, of which $5,000 is available under a letter of credit
sub-facility. The Revolving Facility has a maturity date of June 30, 2004.
 
    All amounts outstanding under the Credit Agreement are secured by (i) a
pledge of all of the capital stock and intercompany notes of the Company and its
direct and indirect subsidiaries existing October 2, 1998 or thereafter and (ii)
an interest in substantially all of the tangible and intangible properties and
assets (including substantially all contract rights, certain real property
interests, trademarks, tradenames, equipment and proceeds of the foregoing) of
Corp, the Company and their respective direct and indirect domestic subsidiaries
existing on the October 2, 1998 or thereafter created or acquired (the "Domestic
Subsidiaries"). Corp and each of the Domestic Subsidiaries have unconditionally
guaranteed, on a joint and several basis, all obligations of the Company under
the Credit Agreement.
 
    The Term Loans have an "excess cash flows" provision mandating additional
principal payments if certain cash flows targets are met during the year. No
additional principal payments are required as of December 31, 1998 related to
this provision.
 
    The Company is required to pay certain commitment fees in connection with
the Credit Agreement based upon the average daily unused portion of the
Revolving Facility, certain fees assessed in connection with the issuance of
letters of credit as well as other fees specified in the Credit Agreement and
other documents related thereto.
 
    The Credit Agreement requires the Company to comply with certain covenants
which, among other things, include limitations on indebtedness, liens and
further negative pledges, investments, contingent obligations, dividends,
redemptions and repurchases of equity interests, mergers, acquisitions and asset
sales, capital expenditures, sale leaseback transactions, transactions with
affiliates, dividend and other payment restrictions affecting subsidiaries,
changes in business conducted, amendment of documents relating to other
indebtedness and other material documents, creation of subsidiaries, designation
of
 
                                      F-17
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
9. NOTES PAYABLE: (CONTINUED)
Designated Senior Indebtedness in respect of the Notes, and prepayment or
repurchase of other indebtedness. The Credit Agreement requires the Company to
meet certain financial tests pertaining to, interest coverage, fixed charge
coverage and leverage.
 
    The Credit Agreement contains customary events of default, including,
without limitation, payment defaults, covenant defaults, breaches of
representations and warranties, bankruptcy and insolvency, judgments, change of
control and cross-default with certain other indebtedness.
 
    Principal payments due during the next five years on long-term notes payable
as of December 31, 1998 are as follows:
 
<TABLE>
<S>                                                 <C>
1999..............................................  $   2,209
2000..............................................      2,260
2001..............................................      2,140
2002..............................................      2,000
2003..............................................      2,000
Thereafter........................................    168,618
                                                    ---------
                                                    $ 179,227
                                                    ---------
                                                    ---------
</TABLE>
 
                                      F-18
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
10. FEDERAL INCOME TAX:
 
    Temporary differences that give rise to the deferred income tax assets and
liabilities are as follows as of December 31:
 
<TABLE>
<CAPTION>
                                                                             1998       1997
                                                                           ---------  ---------
<S>                                                                        <C>        <C>
Deferred income tax assets:
  Stock option compensation..............................................  $   2,486  $      --
  Transaction costs......................................................      1,341         --
  Allowance for doubtful accounts........................................        380         52
  Inventory cost capitalization and valuation............................        648         72
  Accrued vacation and bonus.............................................        608         80
  Warranty reserve.......................................................        135         --
  Workers' compensation reserve..........................................        431         --
  Other..................................................................        130         59
                                                                           ---------  ---------
                                                                               6,159        263
Deferred income tax liabilities:
  Depreciation...........................................................     (1,861)      (449)
  LIFO reserve...........................................................     (1,505)      (829)
  Capitalized software costs.............................................     (1,039)        --
  Amortization of goodwill...............................................       (506)        --
                                                                           ---------  ---------
                                                                              (4,911)    (1,278)
                                                                           ---------  ---------
Net deferred income tax asset asset (liability)..........................      1,248     (1,015)
Less-current deferred tax asset (liability)..............................      1,249       (566)
                                                                           ---------  ---------
Long-term deferred tax liability.........................................  $      (1) $    (449)
                                                                           ---------  ---------
                                                                           ---------  ---------
</TABLE>
 
    A valuation allowance is required against deferred tax assets if, based on
the weight of available evidence, it is more likely than not that some of or all
of the deferred tax assets will not be realized. As of December 31, 1998 and
1997, no valuation reserve was required.
 
    The components of the provision for income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                       THE COMPANY                   PREDECESSOR
                                       -------------------------------------------  -------------
                                        YEAR ENDED     YEAR ENDED    PERIOD ENDED   PERIOD ENDED
                                       DECEMBER 31,   DECEMBER 31,   DECEMBER 31,    OCTOBER 25,
                                           1998           1997           1996           1996
                                       -------------  -------------  -------------  -------------
Current federal income tax provision
  (benefit)..........................    $    (467)     $     462      $     153      $     441
<S>                                    <C>            <C>            <C>            <C>
Deferred federal income tax
  provision..........................          330            184             60            182
State income tax provision
  (benefit)..........................          (12)            49             16             47
                                             -----          -----          -----          -----
Provision (benefit) for income
  taxes..............................    $    (149)     $     695      $     229      $     670
                                             -----          -----          -----          -----
                                             -----          -----          -----          -----
</TABLE>
 
                                      F-19
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
10. FEDERAL INCOME TAX: (CONTINUED)
    Reconciliation of the federal statutory income tax rate to the effective tax
rate, was as follows:
 
<TABLE>
<CAPTION>
                                                      THE COMPANY                   PREDECESSOR
                                      -------------------------------------------  -------------
                                       YEAR ENDED     YEAR ENDED    PERIOD ENDED   PERIOD ENDED
                                      DECEMBER 31,   DECEMBER 31,   DECEMBER 31,    OCTOBER 25,
                                          1998           1997           1996           1996
                                      -------------  -------------  -------------  -------------
Tax computed at statutory rate......    $    (815)     $     473      $     181      $     606
<S>                                   <C>            <C>            <C>            <C>
State taxes, net of federal
  benefit...........................          (12)            67             22             40
Amortization of goodwill............          495            110             18             --
Other...............................          183             45              8             24
                                            -----          -----          -----          -----
Provision (benefit) for income
  taxes.............................    $    (149)     $     695      $     229      $     670
                                            -----          -----          -----          -----
                                            -----          -----          -----          -----
</TABLE>
 
11. PREFERRED STOCK:
 
    Wing was authorized to issue 2,000 shares, $.01 par value of preferred stock
and at December 31, 1997 there were no shares outstanding. Concurrent with the
Recapitalization discussed in Note 3, all of Wing's authorized preferred stock
was canceled.
 
12. RELATED PARTIES:
 
    MANAGEMENT AND INVESTMENT BANKING AGREEMENT
 
    In November 1997, Wing amended its ten-year Management and Investment
Banking Agreement (the "Old Management Agreement") with Ardshiel. Pursuant
thereto, Wing agreed to pay Ardshiel an annual fee of $375 plus expenses for
ongoing management advisory services to Wing. In 1998, 1997 and 1996, $368, $485
and $72, respectively, was paid to Ardshiel under this agreement. The Old
Management Agreement was terminated in connection with the Recapitalization on
October 2, 1998.
 
    FINANCIAL ADVISORY FEE
 
    Ardshiel received a financial advisory fee of $600 plus expenses on the
closing date of the October 26, 1996 transaction as compensation for its
services as financial advisor to Wing. In addition, Ardshiel received warrants
to obtain 5,714 shares of Class A voting common stock at no additional cost.
Such warrants can be converted into Class A voting common stock at any time. The
warrants were valued at $332 and were included in the total purchase price of
Wing.
 
    Ardshiel received an investment banking fee of $250 plus expenses on the
closing date of the acquisition of the of the Door Division of Super Millwork,
Inc. acquisition as compensation for its services to Wing in connection with
this acquisition.
 
    SHAREHOLDER AGREEMENT
 
    GEIPPPII, Ardatrium and certain of its affiliates, and certain other
shareholders of Parent have entered into a Shareholder Agreement (the
"Shareholder Agreement"), dated as of October 2, 1998, which affect their
relative rights as shareholders of Parent.
 
                                      F-20
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
12. RELATED PARTIES: (CONTINUED)
    MANAGEMENT AGREEMENT
 
    Parent is a party to a Management Agreement (the "Management Agreement")
dated October 2, 1998 with Ardshiel. Pursuant to the Management Agreement,
Ardshiel provides advice to Parent and its subsidiaries with respect to business
strategy, operations and budgeting and financial controls ("Management
Services") in exchange for an annual fee of $1,300 plus expenses. Additionally,
the Management Agreement provides that, prior to entering into any transaction
that involves engaging a financial advisor to perform services in connection
with a sale or purchase of a business or entity or any financing including,
Parent or its subsidiaries must offer Ardshiel the opportunity to perform such
investment banking services, unless in the reasonable exercise of the business
judgement of the Board of Directors of Parent such engagement would result in a
conflict of interest or would otherwise be adverse to the interests of Parent or
such subsidiaries. Ardshiel shall receive a fee for any such services rendered
by Ardshiel to Parent or its subsidiaries which fee shall not be greater than 2%
of the total purchase or sale price for such business or entity and shall be
payable upon consummation of such sale or purchase. The consent of GEIPPPII is
required prior to the payment by Parent or any of its subsidiaries in paying
similar fees to other entities for similar services. Parent paid a closing fee
of approximately $3,375 upon the consummation of the Merger and paid Ardshiel's
fees and expenses in connection therewith. The Management Agreement will remain
in effect until October 2, 2008 and will automatically be renewed for one-year
periods unless either party gives written notice to the contrary at least 30
days prior to the expiration of the initial or any extended term of the
agreement.
 
    NOTES RECEIVABLE
 
    Included in prepaid expenses and other current assets are the following
receivables due from related parties at December 31:
 
<TABLE>
<CAPTION>
                                                                                  1998       1997
                                                                                ---------  ---------
<S>                                                                             <C>        <C>
Receivables from officers.....................................................  $     123  $      --
Receivables from employees....................................................  $     211  $      --
</TABLE>
 
13. COMMITMENTS AND CONTINGENCIES:
 
    EMPLOYMENT AGREEMENTS
 
    The Company has entered into employment agreements with several key
executives of the Company including its President and Chief Executive Officer,
its Chief Financial Officer and Chief Operating Officer and several Divisional
Presidents, Vice Presidents, General Managers and Sales Managers of the
Company's divisions. The agreements generally provide for terms of employment,
annual salaries, bonuses, and eligibility for option awards and severance
benefits.
 
                                      F-21
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
13. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
 
    OPERATING LEASES
 
    The Company has entered into operating lease agreements for office and
manufacturing space, automobiles, and machinery and equipment with unrelated
third parties, affiliates of certain stockholders and certain stockholders of
the Company. Total rent expense for 1998, 1997 and for the periods ended
December 31, 1996 and October 25, 1996 was $2,862, $1,189, $172 and $691,
respectively. Of these totals, amounts paid to related parties was $398 for 1998
and $0 for 1997 and the periods ended December 31, 1996 and October 25, 1996.
Future minimum rents due under operating leases with initial or remaining terms
greater than twelve months are as follows:
 
<TABLE>
<CAPTION>
                                                                RELATED     OTHER
                                                                PARTIES    PARTIES     TOTAL
                                                               ---------  ---------  ---------
<S>                                                            <C>        <C>        <C>
1999.........................................................  $   1,317  $   3,898  $   5,215
2000.........................................................      1,317      3,348      4,665
2001.........................................................      1,317      2,779      4,096
2002.........................................................      1,180      1,989      3,169
2003.........................................................      1,272      1,407      2,679
Thereafter...................................................     14,001      3,627     17,628
                                                               ---------  ---------  ---------
                                                               $  20,404  $  17,048  $  37,452
                                                               ---------  ---------  ---------
                                                               ---------  ---------  ---------
</TABLE>
 
    FORWARD COMMITMENTS
 
    The Company has contracts with various suppliers to purchase aluminum for
use in the manufacturing process. The contracts vary from one to twelve months
and are at fixed quantities with fixed and floating prices. As of December 31,
1998, the Company had forward commitments totaling $2,623 for delivery through
December 1999 for 21.1 million pounds of aluminum, of which 3.6 million pounds
were at fixed prices, respectively. No amounts were outstanding as of December
31, 1997.
 
    CONTINGENCIES
 
    The Company is party to various claims, legal actions and complaints arising
in the ordinary course of business. In the opinion of management, all such
matters are without merit or are of such kind, or involve such amounts, that an
unfavorable disposition would not have a material effect on the consolidated
financial position, results of operations or liquidity of the Company.
 
    During 1993, factory employees voted to unionize and become members of
Amalgamated Clothing and Textile Workers Union. A three-year union contract was
executed during 1995 and extended for three additional years in 1998. In
addition, in connection with its Woodville, Texas operations, the Company is
party to collective bargaining arrangements due to expire in 2001.
 
    The Company is involved in various stages of investigation and cleanup
related to environmental protection matters, some of which relate to waste
disposal sites. The potential costs related to such matters and the possible
impact thereof on future operations are uncertain due in part to: the
uncertainty as to the extent of pollution; the complexity of Government laws and
regulations and their interpretations; the varying costs and effectiveness of
alternative cleanup technologies and methods; the uncertain level of insurance
or other types of recovery; and the questionable level of the Company's
involvement. The
 
                                      F-22
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
13. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
Company was named in 1988 as a potentially responsible party ("PRP") in two
superfund sites pursuant to the Comprehensive Environmental Response
Compensation and Liability Act of 1980, as amended (the Chemical Recycling, Inc.
site in Wylie, Texas, and the Diaz Refinery site in Little Rock, Arkansas). The
Company believes that based on the information currently available, including
the substantial number of other PRP's and relatively small share allocated to it
at such sites, its liability, if any, associated with either of these sites will
not have a material adverse effect on the Company's consolidated financial
position, results of operations or liquidity.
 
14. OTHER INCOME, NET:
 
    Other income, net consists of the following for the year ended December 31,
1998:
 
<TABLE>
<S>                                                    <C>
Rental, interest and other income....................  $     556
Gain on sale of assets...............................         12
Other................................................          3
                                                       ---------
                                                       $     571
                                                       ---------
                                                       ---------
</TABLE>
 
15. STOCK OPTIONS:
 
    The Wing Industries Holdings, Inc. Stock Option Plan (the "Plan") was
adopted on October 25, 1996 and amended on November 17, 1997 to provide certain
employees, officers and directors of Wing an opportunity to purchase Class A
voting common stock of Wing. Options available for grant under the Plan included
(1) "Incentive Stock Options" as defined in Section 422 of the Internal Revenue
Code of 1986, as amended and (2) Nonqualified Stock Options which were options
that did not constitute Incentive Stock Options.
 
    At December 31, 1997, Nonqualified Stock Options for a total of 14,483
shares of Wing's Class A voting common stock had been granted. During 1998, and
prior to the Recapitalization, 1,766 options were exercised. The remaining
12,717 options were exchanged for 2,528,314 options in the D and W Holdings,
Inc. 1998 Stock Option Plan (the "New Plan"). The Plan was terminated in
connection with the Recapitalization. No compensation expense was recorded
during 1997 or 1996.
 
    THE NEW PLAN
 
    In connection with the Recapitalization, the Board of Directors adopted the
New Plan authorizing the issuance of 11,991,142 options to acquire common stock
of the Company. Through December 31, 1998, the Board of Directors granted
11,735,941 options under the New Plan. All options granted under the New Plan
expire ten years from the date of grant, October 2, 1998.
 
    As of December 31, 1998, 1,756,924 options had been granted in three
tranches under the New Plan in replacement of certain of the options granted
under the Plan. These options consist of (a) options to purchase 692,861 shares
of common stock at an exercise price of $0.01 per share; (b) options to purchase
539,135 shares of common stock at an exercise price of $0.72 per share until
December 1, 1999, and then increasing 15% per year thereafter, until and
including December 1, 2000; and (c) options to purchase 524,928 shares of common
stock at an exercise price of $0.82 per share until December 1, 1999, and then
 
                                      F-23
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
15. STOCK OPTIONS: (CONTINUED)
increasing 30% per year thereafter, until and including December 1, 2000. As of
December 31, 1998, 1,064,030 of these options were fully vested. The remaining
options vest on October 25, 1999, subject to accelerated vesting in the event
(a) the Company sells common stock in an offering registered with the Securities
and Exchange Commission which results in a Change of Control (as defined in the
New Plan); (b) the Company is merged or consolidated with another corporation in
a merger in which the surviving corporation has freely tradeable common stock;
(c) substantially all of the assets of the Company and its subsidiaries, taken
as a whole, are sold or otherwise transferred; or (iv) a plan of liquidation of
the Company of the optionee's employer is adopted.
 
    As of December 31, 1998, options of 771,390 with an exercise price of $1.25
had been granted under the New Plan that become exercisable only as such time at
(each such event, a "Value Event") (a) the Company sells common stock in an
offering registered with the Securities and Exchange Commission, which
constitutes a Qualifying Public Offering (as defined in the New Plan); (b) the
Company is merged or consolidated with another corporation in a merger in which
the surviving corporation has freely tradeable common stock; or (c)
substantially all of the assets of the Company and its subsidiaries, taken as a
whole, are sold or otherwise transferred.
 
    As of December 31, 1998, options of 832,314 had been granted that consisted
of two tranches: (a) - options to purchase 277,438 shares with an exercise price
of $0.83 per share to March 31, 1999 and then increasing 15% per year thereafter
and (b) - options to purchase 554,876 shares with an exercise price of $0.83 per
share to March 31, 1999 and then increasing 30% per year thereafter. For the 15%
and the 30% options, if the holder chooses not to exercise at time of vesting,
the strike price increases annually to the next level until expiration. At
December 31, 1998 none of these options were vested. The options vest equally in
one-third increments on January 9, 1999, 2000 and 2001, respectively.
 
    As of December 31, 1998, options of 221,725 with an exercise price of $1.65
had been granted that are exercisable only upon the occurrence of a Value Event.
These options vest at such time of occurrence of a value event.
 
    As of December 31, 1998, options of 8,153,588 options had been granted with
an exercise price of $1.00. On the anniversary of the grant date and prior to
termination of employment, 3,551,526 options will vest 25% and shall continue to
vest ratably as of and after the fourth anniversary date of grant. The remaining
4,602,062 options will vest 20% and shall continue to vest ratably as of and
after the fifth anniversary date of grant. The options expire ten years from the
date of grant.
 
    The Company recorded non cash stock option compensation expense of $1,038 in
1998 in connection with the difference between the fair value of the stock at
the date of issuance ($1.00) and the respective exercise prices of each of the
above grants.
 
    THE REPLACEMENT PLAN
 
    In addition to the New Plan, the Board of Directors adopted the D and W
Holdings, Inc. Replacement Stock Option Plan (the "Replacement Plan") to govern
the terms of certain options to purchase the Company's common stock which were
granted in replacement of outstanding options of Atrium Corp. in connection with
the Recapitalization. Under the Replacement Plan, options to purchase in
aggregate of 1,575,000 shares of the Company's common stock were granted in
exchange for outstanding options of Atrium Corp. which were not cashed out
pursuant to the Merger Agreement. The options granted
 
                                      F-24
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
15. STOCK OPTIONS: (CONTINUED)
pursuant to the Replacement Plan vest ratably over a period of five years on
each anniversary date of the grant. The replacement options have an exercise
price of $0.01 per share.
 
    Upon termination of the optionee's employment, the Company shall have the
right to repurchase the options. In the event termination was for cause, the
price per option repurchased will be equal to the lesser of $1.00 per underlying
share and the market value per share of the Company's common stock, in either
case, minus $0.01 per share. If termination is for other than cause, the
repurchase price will differ for the vested and unvested portions. The unvested
portion will be reacquired at a purchase price equal to the lesser of the market
value per share and $1.00 per share, in each case, minus $0.01 per share and the
vested portion may be reacquired at a purchase price equal to the greater of the
market value per share or $1.00 per share, in each case, minus $0.01 per share.
 
    On October 2, 1998, the Company issued a warrant (the "Warrant") to the
President and Chief Executive Officer (the "Executive") of the Company. Pursuant
to the terms of the Warrant, the Executive is entitled to purchase 2,841,221
shares of common stock at any time subsequent to the Recapitalization. The
exercise price of the Warrant is $.01 per share. An additional 1,894,148 shares
may be purchased under the Warrant at an exercise price of $1.00, representing
the fair market value on the date of grant upon the realization of an 8.0%
internal rate of return. The 1,894,148 options vest ratably each day for three
years. The Warrant will terminate on October 2, 2008. The Company recorded non
cash compensation expense of $2,813 for 1998 in connection with the difference
between the fair market value of the stock at the date of issuance ($1.00) and
the exercise price ($.01).
 
    In addition, in exchange for certain warrants to purchase common stock of
Atrium Corp, the Executive received a warrant to purchase 1,000,000 shares of
the Company's common stock at a price of $.01 per share with a term of twenty
years.
 
    If an event or value event as previously defined were to become probable,
the difference between the option price and the then fair market value would be
charged to earnings at that time.
 
                                      F-25
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
15. STOCK OPTIONS: (CONTINUED)
    The following table summarizes the transactions of the New Plan and the
Replacement Plan for the years ended December 31, 1998 and 1997 and the period
ended December 31, 1996 (all outstanding options were granted to management of
the Company):
 
<TABLE>
<CAPTION>
                                                   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,
                                                       1998           1997           1996
                                                   -------------  -------------  ------------
<S>                                                <C>            <C>            <C>
Outstanding options, beginning of period.........      2,849,863      2,078,473           --
Granted..........................................     13,310,941        771,390    2,078,473
Canceled or expired..............................             --             --           --
Exchanged........................................     (2,528,314)            --           --
Exercised........................................       (321,549)            --           --
                                                   -------------  -------------  ------------
Outstanding options, end of year.................     13,310,941      2,849,863    2,078,473
                                                   -------------  -------------  ------------
                                                   -------------  -------------  ------------
Weighted average exercise price of options
  exercised......................................  $         .84  $          --   $       --
Weighted average exercise price of options
  granted........................................  $         .82  $        1.25   $      .42
Weighted average exercise price, end of period...  $         .85  $        0.74   $      .42
Options exercisable, end of period...............      1,064,030        461,937           --
Options available for future grant...............        255,201        731,415      834,837
</TABLE>
 
    The following table summarizes information about stock options and warrants
outstanding at December 31, 1998:
 
<TABLE>
<CAPTION>
                              OPTIONS OUTSTANDING               OPTIONS EXERCISABLE
                    ----------------------------------------  -----------------------
                                    WEIGHTED      WEIGHTED                 WEIGHTED
                                     AVERAGE       AVERAGE                  AVERAGE
RANGE OF EXERCISE      NUMBER       REMAINING     EXERCISE      NUMBER     EXERCISE
      PRICES        OUTSTANDING   LIFE (MONTHS)     PRICE     EXERCISABLE    PRICE
------------------  ------------  -------------  -----------  ----------  -----------
<S>                 <C>           <C>            <C>          <C>         <C>
Options:
  $ .01                2,267,861          117     $     .01      461,906   $     .01
  $.83 - 1.00          9,525,037          117     $     .98      308,150   $     .79
  $1.21 - 1.65         1,518,043          117     $    1.29      293,974   $    1.07
                    ------------                              ----------
                      13,310,941                               1,064,030
Warrants:
  $ .01                2,841,221          117     $     .01    2,841,221   $     .01
  $1.00                1,894,148          117     $    1.00      155,541   $    1.00
                    ------------                              ----------
                       4,735,369                               2,996,762
</TABLE>
 
    In 1995, the FASB issued FASB Statement No. 123 ("FAS 123") "Accounting for
Stock-Based Compensation" which, if fully adopted by the Company, would change
the methods the Company applies in recognizing the cost of the stock based
plans. Adoption of the cost recognition provisions of FAS 123 is optional and
the Company has decided not to elect the provisions of FAS 123. However, pro
forma disclosures as if the Company adopted the cost recognition provisions of
FAS 123 are required by FAS 123;
 
                                      F-26
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
15. STOCK OPTIONS: (CONTINUED)
however, there is no pro forma effect of adopting the cost provisions of FAS 123
for the years ended December 31, 1998 and 1997 and the periods ended December
31, 1996 and October 25, 1996. In 1998, 1997 and 1996, the Company granted only
nonqualified stock options and warrants under the plans.
 
    The fair value of each stock option granted is estimated on the date of
grant using the minimum value method of option pricing with the following
weighted-average assumptions for grants in 1998 and 1997: dividend yield of
0.0%; risk-free interest rate of 7.0%; and the expected life of 10 years. (In
determining the "minimum value" SFAS 123 does not require the volatility of the
Company's common stock underlying the options to be calculated or considered
because the Company was not publicly-traded when the options were granted).
 
    Had the compensation cost for the Company's stock-based compensation plans
and warrants been determined consistent with FAS 123, the Company's net income
(loss) for 1998, 1997 and 1996 would have been ($3,122), $440 and $224,
respectively.
 
    The effects of applying FAS 123 in this pro forma disclosure are not
indicative of future amounts. FAS 123 does not apply to awards prior to 1995.
 
16. EMPLOYEE BENEFIT PLANS:
 
    Prior to the formation of Wing, management announced the curtailment of the
defined benefit pension plan covering substantially all employees. Upon receipt
of a favorable tax determination letter from the Internal Revenue Service,
settlement of the plan occurred during the period ended October 25, 1996, at
which time a liquidating distribution of $2,789 was made to the eligible
employees based on years of service and the employee's compensation during the
five consecutive years of employment in which compensation was the highest. In
addition, management retired the two nonqualified, unfunded and noncontributory
plans for the directors. Settlement of the plans occurred during the period
ended October 25, 1996 at which time a lump-sum payout of $801 was made to the
directors.
 
    The Company maintains an employees' savings plan under Section 401(k) of the
Internal Revenue Code (the "Code"). The Company makes discretionary matching
contributions equal to 50% of the first 4% of the employee's contribution. The
Company contributed $101, $85, $78 during 1998 and 1997 and the period ended
December 31, 1996, respectively.
 
    In connection with the Recapitalization, the Company maintains two
additional plans under Section 401(k) and 401 of the Code. Each plan provides
for discretionary contributions by the employer. The Plan covered by Section 401
of the Code does not provide for employee contributions. The Company contributed
$57 to the plans during the period from October 3, 1998 to December 31, 1998.
 
17. SUBSIDIARY GUARANTORS:
 
    In connection with the Company's Senior Subordinated Notes, the Company's
payment obligations under the Notes are fully and unconditionally guaranteed,
jointly and severally (collectively, the Subsidiary Guarantees) on a senior
subordinated basis by its wholly-owned subsidiaries: ADW-Northeast, ADW-Arizona,
ADW-West Coast, Wing and Darby (collectively, the Subsidiary Guarantors). The
Company has no non-guarantor direct or indirect subsidiaries. The operations
related to the assets of ADW-Northeast ADW-Arizona ADW-West Coast and Darby are
included since the reverse acquisition on October 2, 1998.
 
                                      F-27
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
17. SUBSIDIARY GUARANTORS: (CONTINUED)
The operations of Wing are presented for all periods covered. The balance sheet
information includes all subsidiaries as of December 31, 1998 and only Wing as
of December 31, 1997. In the opinion of management, separate financial
statements of the respective Subsidiary Guarantors would not provide additional
material information, which would be useful in assessing the financial
composition of the Subsidiary Guarantors. No single Subsidiary Guarantor has any
significant legal restrictions on the ability of investors or creditors to
obtain access to its assets in event of default on the Subsidiary Guarantee
other than its subordination to senior indebtedness.
 
    Following is summarized combined financial information pertaining to these
Subsidiary Guarantors:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 31,  DECEMBER 31,
                                                                       1998          1997
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Current assets...................................................   $   42,887    $   23,610
Noncurrent assets................................................      157,678        31,773
Current liabilities..............................................       16,666        12,885
Noncurrent liabilities...........................................      123,049        31,823
</TABLE>
 
                                      F-28
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
 
17. SUBSIDIARY GUARANTORS: (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                      TWELVE MONTHS ENDED
                                                                          DECEMBER 31,
                                                                   --------------------------
                                                                       1998          1997
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Net sales........................................................   $  165,333    $   99,059
Gross profit.....................................................       37,340        20,789
Net income from continuing operations............................          503           696
Net income.......................................................          503           696
</TABLE>
 
    The Notes and the Subsidiary Guarantees are subordinated to all existing and
future Senior Indebtedness of the Company. The indenture governing the Notes
contains limitations on the amount of additional indebtedness (including Senior
Indebtedness) which the Company may incur.
 
18. SUBSEQUENT EVENTS:
 
    DELTA ACQUISITION
 
    On January 27, 1999, the Company acquired certain assets of Delta Millwork,
Inc., a privately held door pre-hanger located in Orlando, Florida, for $1,300.
The Company financed the acquisition through its revolving credit facility.
 
    The acquisition will be accounted for as a purchase in accordance with
Accounting Principles Board Opinion No. 16, "Business Combinations" ("APB 16").
The aggregate purchase price will be allocated to the underlying assets and
liabilities based upon their respective estimated fair market values at the date
of acquisition, with the remainder allocated to goodwill. Based on preliminary
estimates which will be finalized at a later date, the excess of purchase price
over the fair value of the net assets acquired ("goodwill") was approximately
$100, which will be amortized over 40 years. The results of operations for the
acquired business will be included in the Company's consolidated financial
statements beginning January 27, 1999.
 
    MANAGEMENT CHANGE
 
    On April 9, 1999, the Company completed a separation agreement with Randall
S. Fojtasek, President and Chief Executive Officer, whereby Mr. Fojtasek
resigned from the Company effective March 31, 1999. The Board of Directors has
nominated Jeff L. Hull, Executive Vice President and Chief Financial Officer,
and Ken L. Gilmer, Executive Vice President and Chief Operating Officer, to
oversee day-to-day operations and report directly to the Executive Committee of
the Board of Directors. The Company expects to take a charge of approximately
$1,750 in the first quarter of fiscal year 1999 for severance benefits related
to this management change.
 
                                      F-29
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
                     INDEX TO FINANCIAL STATEMENT SCHEDULES
 
<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------
                                                                                          PAGE
-------------------------------------------------------------------------------------------
<S>                                                                                    <C>
Valuation and Qualifying Accounts....................................................         S-2
 
-------------------------------------------------------------------------------------------
</TABLE>
 
                                      S-1
<PAGE>
                       VALUATION AND QUALIFYING ACCOUNTS
 
<TABLE>
<CAPTION>
                                                                          COLUMN C -
                                                                           ADDITIONS
                                                                         -------------
                                                           COLUMN B -         (1)        COLUMN D -
                                                           BALANCE AT     CHARGED TO    DEDUCTIONS -     COLUMN E -
                                                            BEGINNING      COSTS AND     WRITE-OFFS      BALANCE AT
COLUMN A - DESCRIPTION                                      OF PERIOD      EXPENSES          (A)        END OF PERIOD
--------------------------------------------------------  -------------  -------------  -------------  ---------------
<S>                                                       <C>            <C>            <C>            <C>
Allowance for doubtful accounts:
  Year ended December 31, 1996..........................    $       0      $   1,561      $    (731)      $     830
  Year ended December 31, 1997..........................    $     830      $   1,791      $  (1,896)      $     725
  Year ended December 31, 1998..........................    $     725      $     227      $    (174)      $     778
</TABLE>
 
(a) net of recoveries
 
                                      S-2
<PAGE>
                    ATRIUM COMPANIES, INC. AND SUBSIDIARIES
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                                       DESCRIPTION OF EXHIBITS
-----------             ------------------------------------------------------------------------------------------------------
<C>          <C>        <S>
       2.1          --  Asset Purchase Agreement dated as of March 4, 1998, among Masterview Window Company LLC, Atrium
                        Companies, Inc. and, for the limited purposes set forth therein, BancBoston Ventures, Inc. (3)
       2.2          --  Agreement and Plan of Merger by and among D and W Holdings, Inc., D and W Acquisition Corp., Atrium
                        Corporation, and the securityholders therein dated as of August 3, 1998 (4)
       2.3          --  Amendment No. 1 to the Agreement and Plan of Merger by and among D and W Holdings, Inc., D and W
                        Acquisition Corp., Atrium Corporation and the securityholders named therein, dated as of October 2,
                        1998 (5)
       2.4          --  Amendment No. 2, dated as of April 14, 1999 to the Agreement and Plan of Merger by and among D and W
                        Holdings, Inc., D and W Acquisition Corp., Atrium Corporation and the securityholders named therein
                        (5)
       3.1          --  Certificate of Incorporation of Atrium Companies, Inc., as amended (1)
       3.2          --  Bylaws of Atrium Companies, Inc.(1)
       4.1          --  Exchange and Registration Rights Agreement made as of November 27, 1996 by and among Atrium Companies,
                        Inc., the Subsidiary Guarantors and BT Securities Corporation (1)
       4.2          --  Indenture dated as of November 27, 1996 by and among Atrium Companies, Inc., the Subsidiary Guarantors
                        and United States Trust Company of New York (1)
       4.3          --  Notice of Change of Control and Offer to Purchase, dated as of October 9, 1998, by Atrium Companies,
                        Inc. for any and all of its 10 1/2% Senior Subordinated Notes due November 15, 2006, Series B and
                        Supplemental Letter, dated October 19, 1998 (4)
       4.4          --  Amendment No. 1, dated as of March 23, 1998, to the Indenture dated as of November 27, 1996 (the
                        "Indenture"), by and among Atrium Companies, Inc., the Subsidiary Guarantors named therein and United
                        States Trust Company of New York (the "Trustee") (5)
       4.5          --  Amendment No. 2, dated as of October 2, 1998, to the Indenture dated as of November 27, 1996 and
                        amended as of March 23, 1998 (the "Indenture"), by and among Atrium Companies, Inc., the Subsidiary
                        Guarantors named therein and United States Trust Company of New York (the "Trustee") (5)
       4.6          --  Amendment No. 3, dated as of January 28, 1999, to the Indenture dated as of November 27, 1996 and
                        amended as of March 23, 1998 and further amended as of October 2, 1998 (the "Indenture"), by and among
                        Atrium Companies, Inc., the Subsidiary Guarantor named therein and United States Trust Company of New
                        York (the "Trustee") (5)
      10.1          --  Employment Agreement between the Company and Horace T. Hicks dated January 1, 1998 (2)
      10.2          --  Employment Agreement between the Company and Louis W. Simi, Jr. dated January 1, 1998 (2)
      10.3          --  Employment Agreement between the Company and Arthur G. Frost dated January 1, 1998 (2)
      10.4          --  Escrow Agreement dated July 3, 1995 among Fojtasek/Heritage Acquisition Company, The Company, Randall
                        Fojtasek and the First National Bank of Boston (1)
      10.5          --  Atrium Lease Agreement, as amended (1)
</TABLE>
 
                                      E-1
<PAGE>
<TABLE>
<C>          <C>        <S>
      10.6          --  H-R Windows Lease Agreement (1)
      10.7          --  Second Amendment to the Atrium Lease Agreement (2)
      10.8          --  First Amendment to the H-R Windows Lease Agreement (2)
      10.9          --  Stockholders Agreement, dated as of October 2, 1998, by and among D and W Holdings, Inc., a Delaware
                        Corporation (the "Company") and each of the individuals and entities signatory thereto (each a
                        "Stockholder" and together the "Stockholders") (4)
      10.10         --  Credit Agreement dated as of October 2, 1998 by and among Atrium Companies, Inc., as Borrower, D and W
                        Holdings, Inc., as Parent, the Guarantors party thereto, Merrill Lynch & Co., Merrill Lynch, Pierce,
                        Fenner & Smith Incorporated, as Lead Arranger, Syndication Agent and Documentation Agent, and
                        BankBoston, N.A., as Administrative Agent, and the Lenders party thereto (4)
      10.11         --  Management Agreement, dated as of October 2, 1998, by and among Ardshiel, Inc.,
                        D and W Holdings, Inc., Atrium Corporation and Atrium Companies, Inc. (5)
      10.12         --  Employment Agreement, dated as of October 2, 1998, by and between D and W Holdings, Inc., Jeff L. Hull
                        and Atrium Companies, Inc. (5)
      10.13         --  Employment Agreement, dated as of October 2, 1998, by and between D and W Holdings, Inc., R.L. Gilmer
                        and Wing Industries, Inc. (5)
      10.14         --  Employment Agreement, dated as of January 8, 1998, by and between Door Holdings, Inc. and Cliff Darby
                        (5)
      10.15         --  Buy-Sell Agreement, dated as of October 2, 1998, by and among D and W Holdings, Inc., GE Investment
                        Private Placement Partners II and R.L. Gilmer (standard agreement) (5)
      10.16         --  Buy-Sell Agreement, dated as of October 2, 1998, by and among D and W Holdings, Inc., GE Investment
                        Private Placement Partners II and Cliff Darby (5)
      10.17         --  D and W Holdings, Inc. 1998 Stock Option Plan (5)
      10.18         --  D and W Holdings, Inc. 1998 Replacement Stock Option Plan (5)
      10.19         --  Termination Agreement, dated as of October 2, 1998, between Atrium Corporation, Atrium Companies,
                        Inc., Hicks, Muse & Co. Partners, L.P. and Hicks, Muse, Tate & Furst Incorporated (5)
      10.20         --  Warrant issued to Randall S. Fojtasek, dated as of October 2, 1998, to purchase common stock of D and
                        W Holdiings, Inc. (5)
      10.21         --  Exchange Warrant issued to Randall S. Fojtasek, dated as of October 2, 1998, to purchase common stock
                        of D and W Holdings, Inc. (5)
      10.22         --  Amendment, dated as of October 2, 1998, to Warrant dated as of November 27, 1996 issued to Randall S.
                        Fojtasek (5)
      10.23         --  Agreement and Release, dated as of March 31, 1999, by and among Randall S. Fojtasek and D and W
                        Holdings, Inc., Atrium Corporation, Atrium Companies, Inc., Ardshiel, Inc., GE Investment Management
                        Incorporated, GE Investment Private Placement Partners II, a Limited Partnership and the parties named
                        therein (5)
      10.24         --  Identification Escrow Agreement, dated as of October 2, 1998, by and among Hicks, Muse Fund III
                        Incorporated, D and W Holdings, Inc. and Northwest Bank Texas, N.A. (5)
      10.25         --  Amendment No. 1, dated April 14, 1999, to Identification Escrow Agreement by and among Hicks, Muse
                        Fund III Incorporated, D and W Holdings, Inc. and Northwest Bank Texas, N.A. (5)
      12.1          --  Computation of Ratio of Earnings to Fixed Charges (5)
      21.1          --  Subsidiaries of the Company (5)
      24.1          --  Powers of Attorney (5)
</TABLE>
 
                                      E-2
<PAGE>
<TABLE>
<C>          <C>        <S>
      27.1          --  Financial Data Schedule (5)
</TABLE>
 
------------------------
 
(1) Incorporated by reference from the Registrant's Registration Statement on
    Form S-4, dated April 4, 1997, SEC File No. 333-20095.
 
(2) Incorporated by reference from the Registrant's Report on Form 10-K, dated
    March 31, 1998.
 
(3) Incorporated by reference from the Registrant's Report on Form 8-K, dated
    March 27, 1998 and filed on April 13, 1998.
 
(4) Incorporated by reference from the Registrant's Report on Form 8-K, dated
    October 2, 1998 and filed on October 19, 1998.
 
(5) Filed herewith.
 
                                      E-3