Document:

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                                                                   EXHIBIT 10.22

                    ----------------------------------------
                              ATR ACQUISITION, LLC

                      A Delaware Limited Liability Company
                    ----------------------------------------

                              AMENDED AND RESTATED
                       LIMITED LIABILITY COMPANY AGREEMENT

                          Dated as of December 10, 2003

THE MEMBERSHIP INTERESTS REPRESENTED BY THIS LIMITED LIABILITY COMPANY AGREEMENT
HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933 OR UNDER
ANY OTHER APPLICABLE SECURITIES LAWS. SUCH INTERESTS MAY NOT BE SOLD, ASSIGNED,
PLEDGED OR OTHERWISE DISPOSED OF AT ANY TIME WITHOUT EFFECTIVE REGISTRATION
UNDER SUCH ACT AND LAWS OR EXEMPTION THEREFROM, AND COMPLIANCE WITH THE OTHER
RESTRICTIONS ON TRANSFERABILITY SET FORTH HEREIN.

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                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                               Page
<S>                                                                                                            <C>
ARTICLE I DEFINITIONS.............................................................................................1
          1.1     DEFINITIONS.....................................................................................1
          1.2     GENERAL INTERPRETATIVE PROVISIONS..............................................................14
ARTICLE II ORGANIZATION..........................................................................................14
          2.1     FORMATION......................................................................................14
          2.2     NAME...........................................................................................14
          2.3     REGISTERED OFFICE; REGISTERED AGENT; PRINCIPAL OFFICE; OTHER OFFICES...........................14
          2.4     PURPOSES AND POWERS............................................................................14
          2.5     FOREIGN QUALIFICATION..........................................................................14
          2.6     TERM...........................................................................................15
          2.7     NO STATE-LAW PARTNERSHIP.......................................................................15
ARTICLE III MEMBERSHIP; CAPITAL CONTRIBUTIONS; ADDITIONAL UNITS..................................................15
          3.1     MEMBERS........................................................................................15
          3.2     INITIAL CAPITAL CONTRIBUTIONS..................................................................16
          3.3     ADDITIONAL CAPITAL CONTRIBUTIONS; LOANS BY MEMBER..............................................16
          3.4     UNITS; ISSUANCE OF ADDITIONAL UNITS; ADDITIONAL MEMBERS........................................16
          3.5     PREEMPTIVE RIGHTS..............................................................................17
          3.6     LIABILITY OF MEMBERS...........................................................................19
          3.7     MEETINGS; ACTION BY THE MEMBERS................................................................19
          3.8     ADJOURNMENT....................................................................................21
          3.9     VOTING RIGHTS..................................................................................21
          3.10    MEMBER EXPENSES................................................................................21
ARTICLE IV DISTRIBUTIONS; ALLOCATIONS OF PROFITS AND LOSSES......................................................21
          4.1     GENERALLY......................................................................................21
          4.2     DISTRIBUTIONS..................................................................................21
          4.3     ALLOCATION OF PROFITS AND LOSSES...............................................................23
          4.4     TAX ALLOCATIONS................................................................................24
          4.5     OPTIONAL REDEMPTION OF UNITS...................................................................24
ARTICLE V MANAGEMENT.............................................................................................26
          5.1     THE BOARD......................................................................................26
          5.2     ESTABLISHMENT OF BOARD.........................................................................26
          5.3     TERM OF OFFICE.................................................................................27
          5.4     MEETING OF THE BOARD...........................................................................28
          5.5     VOTING.........................................................................................29
          5.6     RESPONSIBILITY AND AUTHORITY OF THE BOARD......................................................29
          5.7     DEVOTION OF TIME...............................................................................29
          5.8     BOARD OF DIRECTORS OF OPERATING COMPANY; GOVERNANCE OF SUBSIDIARIES............................29
          5.9     COMMITTEES.....................................................................................29
          5.10    OBSERVERS AT BOARD MEETINGS....................................................................30
          5.11    PAYMENTS TO REPRESENTATIVES, REIMBURSEMENTS....................................................30
          5.12    REPRESENTATIVE INFORMATION.....................................................................30
          5.13    OFFICERS.......................................................................................30
          5.14    NEGATIVE COVENANTS.............................................................................31
          5.15    AFFIRMATIVE COVENANTS..........................................................................37
</Table>

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<Table>
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          5.16    NO AGREEMENTS, ETC.............................................................................39
          5.17    EFFECT OF ANNUAL BUDGET........................................................................39
          5.18    INITIAL CHIEF EXECUTIVE OFFICER; CHAIRMAN OF OPERATING COMPANY BOARD...........................39
          5.19    COMPLIANCE WITH AGREEMENTS.....................................................................39
          5.20    NO INDEBTEDNESS................................................................................39
          5.21    CERTAIN COMPANY ACTIONS........................................................................39
ARTICLE VI LIABILITY, EXCULPATION, INDEMNIFICATION AND INSURANCE.................................................39
          6.1     LIABILITY......................................................................................39
          6.2     DUTIES AND LIABILITIES OF COVERED PERSONS......................................................39
          6.3     EXCULPATION....................................................................................40
          6.4     INDEMNIFICATION................................................................................40
          6.5     ADVANCEMENT OF EXPENSES........................................................................40
          6.6     NOTICE OF PROCEEDINGS..........................................................................41
          6.7     INSURANCE......................................................................................41
          6.8     OUTSIDE BUSINESSES.............................................................................42
          6.9     INDEMNIFICATION AND REIMBURSEMENT FOR PAYMENTS ON BEHALF OF A MEMBER...........................43
ARTICLE VII TAXES................................................................................................44
          7.1     TAX RETURNS....................................................................................44
          7.2     TAX MATTERS MEMBER.............................................................................44
ARTICLE VIII BOOKS, REPORTS AND COMPANY FUNDS....................................................................44
          8.1     MAINTENANCE OF BOOKS...........................................................................44
          8.2     MEMBER TAX INFORMATION.........................................................................44
          8.3     COMPANY FUNDS..................................................................................44
ARTICLE IX TRANSFERS OF SECURITIES...............................................................................44
          9.1     TRANSFERS BY MEMBERS...........................................................................44
          9.2     FIRST OFFER RIGHT..............................................................................47
          9.3     TAG-ALONG RIGHTS...............................................................................49
          9.4     SALE OF THE COMPANY............................................................................51
          9.5     SALE OF THE OPERATING COMPANY..................................................................52
          9.6     LEVERAGED RECAPITALIZATION TRANSACTION RIGHTS..................................................54
          9.7     ENGAGEMENT OF FINANCIAL ADVISOR................................................................55
          9.8     QUALIFIED PUBLIC OFFERING......................................................................55
          9.9     ASSIGNMENTS GENERALLY..........................................................................55
          9.10    TRANSFERS BY THE COMPANY.......................................................................57
          9.11    PRO RATA DISPOSITIONS..........................................................................57
ARTICLE X DISSOLUTION, LIQUIDATION AND TERMINATION...............................................................57
          10.1    DISSOLUTION....................................................................................57
          10.2    LIQUIDATION AND TERMINATION....................................................................58
          10.3    CANCELLATION OF CERTIFICATE....................................................................58
ARTICLE XI GENERAL/MISCELLANEOUS PROVISIONS......................................................................58
          11.1    NOTICES........................................................................................58
          11.2    ENTIRE AGREEMENT...............................................................................59
          11.3    EFFECT OF WAIVER OR CONSENT....................................................................59
          11.4    AMENDMENT OR MODIFICATION......................................................................59
          11.5    BINDING EFFECT.................................................................................59
          11.6    GOVERNING LAW; SEVERABILITY....................................................................59
</Table>

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<Table>
<S>                                                                                                            <C>
          11.7    FURTHER ASSURANCES.............................................................................60
          11.8    WAIVER OF CERTAIN RIGHTS.......................................................................60
          11.9    NOTICE TO MEMBERS OF PROVISIONS................................................................60
          11.10   COUNTERPARTS...................................................................................60
          11.11   CONSENT TO JURISDICTION........................................................................60
          11.12   HEADINGS.......................................................................................60
          11.13   REMEDIES.......................................................................................60
          11.14   SEVERABILITY...................................................................................61
          11.15   NO THIRD PARTY BENEFICIARIES...................................................................61
          11.16   CONFIDENTIALITY................................................................................61
          11.17   TERMINATION....................................................................................62
ARTICLE XII......................................................................................................62
VALUATION OF MARKETABLE SECURITIES...............................................................................62
          12.1    VALUATION OF MARKETABLE SECURITIES.............................................................62
          12.2    VALUATION DISPUTES.............................................................................63
ARTICLE XIII.....................................................................................................64
POWER OF ATTORNEY................................................................................................64
          13.1    POWER..........................................................................................64
          13.2    NATURE OF POWER................................................................................65
</Table>

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SCHEDULES:

         Schedule A                 Names; Addresses, Capital Contributions
         Schedule C                 Ownership of Operating Company Share
                                    Equivalents
         Schedule 5.14(a)(iv)       Approved Related Party Transactions
         Schedule 5.16              Member Agreements with respect to the
                                    subject matter of this Agreement

EXHIBITS:

         Exhibit A                  2003 Approved Annual Budget
         Exhibit B                  Form of Joinder to Limited Liability
                                    Company Agreement
         Exhibit C                  Stockholders Agreement
         Exhibit D                  UBS Nominee and Sharing Agreement
         Exhibit E                  ML Nominee and Sharing Agreement

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<PAGE>

                              AMENDED AND RESTATED
                       LIMITED LIABILITY COMPANY AGREEMENT
                                       OF
                              ATR ACQUISITION, LLC
                      A DELAWARE LIMITED LIABILITY COMPANY

                  This Amended and Restated Limited Liability Company Agreement
         of ATR Acquisition, LLC is made as of December 10, 2003, among the
         Members (as defined below).

                                    RECITALS

                  A. The Initial Organizational Member (as defined below)
         entered into a limited liability company agreement dated as of November
         6, 2003, and, as an authorized person, executed and filed a Certificate
         of Formation of the Company with the Office of the Secretary of State
         of the State of Delaware on November 6, 2003, thereby forming the
         Company as a limited liability company under and pursuant to the
         Delaware Limited Liability Company Act, 6 Del. C. Sections 18-101, et
         seq.

                  B. The Members (including the Initial Organizational Member)
         now wish to amend and restate the original limited liability company
         agreement of the Company (the "Original Agreement").

                  NOW, THEREFORE, in consideration of the agreements and
obligations set forth herein, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto,
intending to be legally bound, hereby agree that the Original Agreement is
amended and restated in its entirety to read as follows:

                                    ARTICLE I
                                   DEFINITIONS

                  1.1 DEFINITIONS. As used for this Agreement, the following
terms have the following meanings:

                  "Acceptance Notice" has the meaning given that term in Section
         9.2(a).

                  "Act" means the Delaware Limited Liability Company Act, Title
         6, Sections 18-101, et seq., and any successor statute, as amended from
         time to time.

                  "Additional Units" has the meaning given that term in Section
         3.4.

                  "Affiliate" of, or a Person "Affiliated" with, a specified
         Person means a Person that directly or indirectly through one or more
         intermediaries, Controls, or is Controlled by, or is under common
         Control with, the Person specified.

                  "Agreement" means this Amended and Restated Limited Liability
         Company Agreement, as it may be amended, modified, supplemented or
         restated from time to time.

<PAGE>

                  "Annual Budget" means, for any Fiscal Year, a budget proposed
         by the Operating Company (including any amendments of or supplements to
         a previously Approved Annual Budget), denominated in dollars, providing
         for receipts and expenditures of the Atrium Group Companies on a
         monthly basis during such Fiscal Year in reasonable detail, including
         (i) a consolidated statement of income (A) for the nine-month period
         ended September 30 of such Fiscal Year, and (B) for such Fiscal Year,
         (ii) a consolidated statement of cash flow (A) for the nine-month
         period ended September 30 of such Fiscal Year, and (B) for such Fiscal
         Year, and (iii) a consolidated balance sheet (A) at and as of September
         30 of such Fiscal Year and (B) at and as of December 31st of such
         Fiscal Year, all in substantially the form of the 2003 Approved Annual
         Budget attached hereto as Exhibit A. Notwithstanding anything herein to
         the contrary, no Annual Budget may be approved, amended or supplemented
         except in accordance with Section 5.14(b)(ii).

                  "Appraiser" has the meaning given that term in Section
         12.2(d).

                  "Approved Annual Budget" means, for any Fiscal Year, the
         Annual Budget for such Fiscal Year that has been approved in accordance
         with Section 5.14(b)(ii); provided, however, that if an Annual Budget
         proposed by the Operating Company for a Fiscal Year is not so approved
         by the first day of such Fiscal Year, until such time as such approval
         is given, the Approved Annual Budget for such Fiscal Year shall be, in
         the case of each Fiscal Year after the Fiscal Year of 2003, the
         Approved Annual Budget for the immediately preceding Fiscal Year
         (excluding any transactions provided for therein which are not in the
         ordinary course of business); provided further, however, that the
         Approved Annual Budget for the Fiscal Year 2003 shall be deemed to be
         the Annual Budget for the Fiscal Year ended December 31, 2003, a copy
         of which is attached hereto as Exhibit A.

                  "Atrium Group Company" means the Company, the Operating
         Company or any of their respective Subsidiaries.

                  "Big Four Firm" means any of Deloitte & Touche LLP, Ernst &
         Young LLP, KPMG LLP or PricewaterhouseCoopers LLP (or any of their
         respective successors of like size and standing).

                  "Board" has the meaning given that term in Section 5.1.

                  "Bound Party" means any (i) Member, or (ii) former Member who
         is bound by certain provisions of this Agreement as provided in Section
         4.5(d).

                  "Business" means the business of the Operating Company and its
         Subsidiaries consisting of the manufacturing and distribution of
         residential vinyl and aluminum windows and patio doors in the United
         States and any business incidental to the operation thereof.

                  "Capital Account" means the capital account that shall be
         established for each Member on the books of the Company initially
         reflecting an amount equal to such Member's initial Capital
         Contribution pursuant to Section 3.2.

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<PAGE>

                  "Capital Contribution" means the aggregate contributions made
         by a Member to the Company pursuant to Article III as of the date in
         question, as shown opposite such Member's name on Schedule A, as the
         same may be amended from time to time.

                  "Carry Member" means KAT Group, L.P.

                  "Carry Member Valuation" has the meaning given that term in
         Section 12.2(a).

                  "Certificate" means the Certificate of Formation of the
         Company and any and all amendments thereto and restatements thereof
         filed on behalf of the Company with the Office of the Secretary of
         State of the State of Delaware pursuant to the Act.

                  "Challenge Notice" has the meaning given that term in Section
         12.2(b).

                  "Change of Control" means, with respect to any specified
         Person, the occurrence of any of the following: (i) the Transfer (other
         than by way of merger or consolidation), in one or a series of related
         transactions, of all or substantially all the assets of such specified
         Person and its Subsidiaries other than to any of its Affiliates; or
         (ii) the consummation of any transaction or series of related
         transactions (including any merger or consolidation) the result of
         which is that any Person (or group of Persons, as determined under
         Section 13(d)(3) of the Exchange Act) other than Affiliates of such
         specified Person becomes the beneficial owner (as determined under rule
         13d-3 promulgated under the Exchange Act), directly or indirectly, of
         more than 50% of the voting stock or other equity interests of such
         specified Person (measured by voting power rather than the number of
         shares or other equity securities). Notwithstanding the foregoing, a
         Change of Control of ML IBK Positions, Inc., Merrill Lynch Ventures
         L.P. 2001, UBS Capital Americas II, LLC or any of their respective
         Permitted Transferees, as the case may be, shall not be deemed to be a
         Change of Control in respect of such Person, for purposes of this
         Agreement.

                  "Code" means the Internal Revenue Code of 1986 and any
         successor statute, as amended from time to time.

                  "Committees" has the meaning given that term in Section
         5.9(a).

                  "Company" means the Delaware limited liability company formed
         pursuant to the Certificate and this Agreement.

                  "Competitor" has the meaning given that term in Section
         6.8(b)(ii).

                  "Contesting Member" has the meaning given that term in Section
         12.2(b).

                  "Control" means the possession, directly or indirectly, of the
         power to direct or cause the direction of the management or policies of
         a Person, whether through the ownership of voting securities, by
         contract or otherwise.

                  "Convertible Securities" means with respect to the Company or
         the Operating Company, as the case may be, rights, warrants, options or
         other convertible or

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<PAGE>

         exchangeable securities (including debt securities), in each case
         exercisable for or convertible or exchangeable into or otherwise
         conferring upon the holder thereof the right to acquire, directly or
         indirectly, equity securities of the Company or the Operating Company,
         as the case may be (whether at the time of issuance or upon the passage
         of time or the occurrence of some future event).

                  "Corporation" means a corporation for profit organized under
         the General Corporation Law of the State of Delaware.

                  "Covered Person" means: (a) a Member, a Representative, the
         Tax Matters Member or a liquidating trustee in each case in his or its
         capacity as such; (b) any Affiliate of a Member, Representative, the
         Tax Matters Member or a liquidating trustee; and (c) any Person of
         which a Representative is an officer, director, shareholder, partner,
         member, employee, representative or agent.

                  "Credit Agreement" means the Credit Agreement dated as of
         December 10, 2003 among Atrium Companies, Inc. and the other parties
         thereto, as in effect on the date hereof (without giving effect to any
         amendment or waiver thereof not previously agreed to in writing by the
         Kenner Group, the ML Group and the UBS Group).

                  "Election Period" has the meaning given that term in Section
         3.5(b).

                  "Electing Member" has the meaning given that term in Section
         4.5(a).

                  "Exchange Act" means the Securities Exchange Act of 1934, as
         amended from time to time.

                  "Excess Amount" has the meaning given that term in Section
         9.2(a).

                  "Exit Triggering Members" means (i) prior to the third
         anniversary of the date hereof, all of the Kenner Group, the ML Group
         and the UBS Group, (ii) after the third anniversary of the date hereof
         and prior to the fifth anniversary of the date hereof, the Kenner Group
         and either the ML Group or the UBS Group, and (iii) thereafter, any two
         of the Kenner Group, the ML Group and the UBS Group.

                  "Family Group" means, with respect to any Member that is a
         natural person, (i) such Member's spouse (including any former spouse),
         (ii) the immediate family members, ancestors and descendants (whether
         natural or adopted) of such Member and/or such Member's spouse
         (including any former spouse), and (iii) any trust or similar entity
         established for the primary benefit of such Member or any of the
         Persons identified in clauses (i) and (ii).

                  "Final Valuation" has the meaning given that term in Section
         12.2(e).

                  "First Offer Notice" has the meaning given that term in
         Section 9.2(a).

                  "Fiscal Year" of the Company means the calendar year.

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<PAGE>

                  "GAAP" means United States generally accepted accounting
         principles, on a consistent basis throughout the periods involved.

                  "HSR Act" has the meaning set forth in Section 4.5.

                  "Indebtedness" shall have the meaning set forth in the Credit
         Agreement.

                  "Indemnified Costs" has the meaning given that term in Section
         6.4.

                  "Indemnifying Member" has the meaning given that term in
         Section 6.9

                  "Initial Organizational Member" means KAT Holdings, L.P.

                  "Investment" means, with respect to any specified Person: (i)
         any advance, loan or other extension of credit (excluding operating
         deposit accounts and certificates of deposit with banks in the ordinary
         course of business consistent with past practice, Permitted
         Investments, accounts receivable, trade credit, advances to customers,
         travel and similar advances to officers and employees in the ordinary
         course of business consistent with past practice) or capital
         contribution to another Person (other than a wholly owned Subsidiary of
         such specified Person) by means of (A) any Transfer of cash or other
         property (tangible or intangible) to such other Person, (B) any payment
         for property or services for the account or use of such other Person,
         or (C) any guarantee of any Indebtedness of such other Person or
         creation or assumption of any other contingent liability in respect of
         any Indebtedness of such other Person; or (ii) any purchase,
         acquisition or ownership by such specified Person of any
         non-Controlling interest issued or owned by any other Person (other
         than a wholly owned Subsidiary of such specified Person) (whether in
         the form of equity securities, equity-linked securities, derivative
         securities or convertible securities (including any interests in any
         partnership or joint venture)).

                  "Issuance Notice" has the meaning given that term in Section
         3.5(b).

                  "Kenner Closing Fee" means a fee of $8,000,000 payable by the
         Operating Company or any of its Subsidiaries to JLK Operations, Inc. or
         any of its Affiliates within 60 days following the date hereof pursuant
         to the Management Agreement.

                  "Kenner Group" means initially KAT Holdings, L.P. and KAT
         Group, L.P. and shall include (i) any Affiliate of KAT Holdings, L.P.
         or KAT Group, L.P. which becomes a Member or a stockholder of the
         Operating Company pursuant to the terms of this Agreement or the
         Stockholders Agreement, and (ii) any Transferee of Units, Operating
         Company Shares or Convertible Securities of KAT Holdings, L.P., KAT
         Group, L.P. or any of their respective Transferees, pursuant to a
         Transfer made in accordance with the terms and conditions hereof or of
         the Stockholders Agreement and which becomes a Member pursuant to the
         terms of this Agreement or a stockholder of the Operating Company
         pursuant to the terms of the Stockholders Agreement. As of any time,
         the act of those Persons holding a majority of the Operating Company
         Share Equivalents held by the Kenner Group as of such time shall be the
         act of the Kenner Group for all purposes

                                       5

<PAGE>

         under this Agreement (including for purposes of Sections 5.2, 5.14,
         9.4, 9.5, 9.6 and 9.8) and the Stockholders Agreement.

                  "Kenner Investment Percentage" means 48.5576%.

                  "Kenner Management Fee" means a management fee of $250,000 per
         Fiscal Year payable by the Operating Company to KAT Holdings, L.P.
         pursuant to the Management Agreement.

                  "Kenner Member" means any Member comprising part of the Kenner
         Group.

                  "Kenner Representatives" has the meaning given that term in
         Section 5.2(b).

                  "Key Executives" means (i) any officer of Atrium Corporation,
         or (ii) any employee of, or consultant to, an Atrium Group Company with
         a base compensation in excess of $250,000 per annum.

                  "Leveraged Recapitalization Transaction" means a transaction
         or series of related transactions involving the incurrence by an Atrium
         Group Company of Indebtedness or issuance of preferred stock (which may
         or may not be secured by the assets of an Atrium Group Company)
         followed by the payment of an extraordinary dividend or other
         distribution to the holders of its equity securities.

                  "Liquidator" means the Person responsible for winding up the
         Company pursuant to Section 10.2 hereof.

                  "Losses" means items of Company loss and deduction determined
         according to Code Section 703(a).

                  "Management Agreement" means the Management Consulting
         Agreement dated as of December 10, 2003, among Atrium Corporation,
         Atrium Companies, Inc., and JLK Operations, Inc., an Affiliate of
         Kenner and Company, as the same may be amended or modified.

                  "Marketable Securities" means any securities (i) which are (A)
         readily marketable on an United States national securities exchange or
         the NMS or (B) traded over-the-counter (other than on the MNS), (ii)
         which are not subject to any holdback, lock-up, market standoff or
         similar agreement or any restriction on the disposition thereof under
         the terms of any other agreement or of any law, regulation or policy,
         and (iii) which the holder (or in the case of a proposed distribution
         hereunder, the proposed distributees) thereof may sell immediately to
         the general public pursuant to an effective registration statement
         under the Securities Act or under Rule 144 under the Securities Act
         without the necessity of any federal, state or local government
         consent, approval or filing (other than any notice filings of the type
         required pursuant to Rule 144(h) under the Securities Act) and without
         violation of federal or state securities laws.

                  "Material Adverse Effect" means any event, circumstance,
         occurrence, fact, condition, change or effect that, with or without the
         passage of time, the giving of notice

                                       6
<PAGE>

         or both, is, or could reasonably be expected to be, materially adverse
         to (i) the business, properties, assets, operations, results of
         operations, conditions (financial or otherwise) or liabilities of the
         Atrium Group Companies taken as a whole, (ii) the ability of the Atrium
         Group Companies to perform on a timely basis any material obligation
         under this Agreement or any other agreement to which it is a party, or
         (iii) the industry or specific markets in which any of the Atrium Group
         Companies competes.

                  "Member" means each Person that from time to time executes a
         counterpart of this Agreement as a member of the Company as provided
         herein, so long as such Person continues as a Member and is reflected
         as such in the books and records of the Company, in each case in such
         Person's capacity as a member of the Company. For purposes of the Act,
         the Members shall constitute a single class or group of members.

                  "Membership Interest" means a Member's interest in the
         Company, including such Member's economic interest and the right, if
         any, to participate in the management of the business and affairs of
         the Company, including the right, if any, to vote on, consent to or
         otherwise participate in any decision or action of or by the Members
         and the right to receive information concerning the business and
         affairs of the Company, in each case to the extent expressly provided
         in this Agreement or otherwise required by the Act. Each Member's
         Membership Interest is represented by the number of Units set forth
         next to each Member's name on Schedule A under the heading "Units".

                  "Merger Agreement" means the Agreement and Plan of Merger,
         dated as of October 27, 2003, as amended, by and among Kat Holdings,
         Inc., a Delaware corporation, KAT Acquisition Corp., a Delaware
         corporation and a wholly-owned Subsidiary of Kat Holdings, Inc., Atrium
         Corporation, a Delaware corporation, and each of the Persons listed on
         the Merger Agreement signature pages, (without giving effect to any
         amendment or waiver thereof not previously agreed to in writing by the
         Kenner Group, the ML Group and the UBS Group).

                  "ML Carry Percentage" means 7.8805%.

                  "ML Closing Fee" means a fee of $1,000,000 payable by the
         Operating Company or any of its Subsidiaries to Merrill Lynch Global
         Partners, Inc. or any of its Affiliates pursuant to the ML Fee
         Agreement at the closing of the purchase and sale of its Units under
         the Unit Purchase Agreement.

                  "ML Fee Agreement" means the Fee Agreement dated as of
         December 10, 2003, among the Operating Company, Atrium Companies, Inc.
         and Merrill Lynch Global Partners, Inc., as the same may be amended or
         modified.

                  "ML Group" means initially ML IBK Positions, Inc. and Merrill
         Lynch Ventures L.P. 2001 and shall include (i) any Affiliate of ML IBK
         Positions, Inc. or Merrill Lynch Ventures L.P. 2001 which becomes a
         Member or a stockholder of the Operating Company pursuant to the terms
         of this Agreement or the Stockholders Agreement, and (ii) any
         Transferee of Units, Operating Company Shares or Convertible Securities
         of ML IBK Positions, Inc., Merrill Lynch Ventures L.P. 2001 or any of
         their respective

                                       7

<PAGE>

         Transferees pursuant to a Transfer made in accordance with the terms
         and conditions hereof or of the Stockholders Agreement and which
         becomes a Member pursuant to the terms of this Agreement or a
         stockholder of the Operating Company pursuant to the terms of the
         Stockholders Agreement. As of any time, the act of those Persons
         holding a majority of the Operating Company Share Equivalents held by
         the ML Group as of such time shall be the act of the ML Group for all
         purposes under this Agreement (including for purposes of Sections 5.2,
         5.14, 9.4, 9.5, 9.6 and 9.8) and the Stockholders Agreement.

                  "ML Investment" means $54,353,721.

                  "ML Investment Percentage" means 21.6158%.

                  "ML Member" means any Member comprising part of the ML Group.

                  "ML Nominee and Sharing Agreement" means the Atrium Investor
         Nominee and Sharing Agreement, among ML IBK Positions, Inc., Merrill
         Lynch Ventures L.P. 2001 and KAT Group, L.P., in substantially the form
         attached hereto as Exhibit D, as the same may be amended or modified.

                  "ML Representative" has the meaning given that term in Section
         5.2(c).

                  "ML Subject Distributions" means, as of the date of
         determination, the sum of (i) the distributions received by the ML
         Members pursuant to Section 4.2(b), plus (ii) the aggregate
         distributions received by the Investor (as such term is defined in the
         ML Nominee and Sharing Agreement) pursuant to Section 2.2 of the ML
         Nominee and Sharing Agreement.

                  "NMS" means the National Market System of the National
         Association of Securities Dealers, Inc.

                  "New Units" has the meaning given that term in Section 3.5(a).

                  "Offer Price" has the meaning given that term in Section
         9.2(a).

                  "Offered Securities" has the meaning given that term in
         Section 9.2(a).

                  "Officer" means each Person who has been designated as, and
         who has not ceased to be, an officer of the Company pursuant to Section
         5.13 hereof, subject to the resolution of the Board appointing such
         Person as an officer of the Company.

                  "Operating Company" means Atrium Corporation, a Delaware
         corporation.

                  "Operating Company Share Equivalents" means, with respect to
         any Person as of any time, (i) the aggregate number of Operating
         Company Shares then owned by such Person plus (ii) the aggregate number
         of Operating Company Shares (without duplication with any Operating
         Company Share included in clause (i) above) that would then be owned by
         such Person assuming (A) if applicable, the redemption of all Units
         then owned by such Person pursuant to Section 4.5(b) (including Units
         issuable pursuant to

                                       8
<PAGE>

         then exercisable Convertible Securities of the Company), and (B) the
         conversion of all then currently exercisable Convertible Securities of
         the Operating Company then owned by such Person. The ownership by each
         Person comprising part of the Kenner Group, the ML Group or the UBS
         Group of Operating Company Share Equivalents on the date hereof
         (indicating the number of Units, Convertible Securities of the Company
         and Convertible Securities of the Operating Company and the percentage
         interest of such Person in the Operating Company Share Equivalents
         deemed outstanding) shall be set forth on Schedule C hereto. From time
         to time the Company shall amend Schedule C hereto solely to reflect
         changes in any such Person's ownership of Operating Company Share
         Equivalents effected in compliance with this Agreement and the
         Stockholders Agreement.

                  "Operating Company Shares" means (i) shares of common stock of
         the Operating Company, (ii) any other shares of Operating Company
         capital stock issued from time to time, or (iii) any equity securities
         of the Operating Company issued with respect to the securities referred
         to in clause (i) or (ii) above by way of a payment-in kind, stock
         dividend, or stock split or in connection with a recapitalization.

                  "Operating Company Share Proceeds" means net proceeds (whether
         in cash, securities or other property) received by the Company as a
         result of (i) any Transfer of the Operating Company Shares held by it
         in compliance with this Agreement, and (ii) any payment of dividends or
         other distributions made to the Company by the Operating Company in
         respect of the Operating Company Shares held by the Company.

                  "Original Agreement" has the meaning given that term in the
         Recitals.

                  "Other Members" has the meaning given that term in Section
         9.3(a).

                  "Person" means a natural person, partnership (whether general
         or limited), limited liability company, trust, estate, association,
         corporation, custodian, nominee or any other individual or entity in
         its own or any representative capacity.

                  "Permitted Investments" shall mean, for any Person: (a) direct
         obligations of the United States of America, or of any agency thereof,
         or obligations guaranteed as to principal and interest by the United
         States of America, or by any agency thereof, in either case maturing
         not more than one year from the date of acquisition thereof by such
         Person; (b) time deposits, certificates of deposit or bankers'
         acceptances (including eurodollar deposits) issued by any bank or trust
         company organized under the laws of the United States of America or any
         state thereof and having capital, surplus and undivided profits of at
         least $500.0 million and a deposit rating of investment grade; (c)
         commercial paper rated A-1 or better by S&P or P-1 or better by
         Moody's, respectively, maturing not more than 180 days from the date of
         acquisition thereof by such Person; (d) repurchase obligations with a
         term of not more than 30 days for underlying securities of the types
         described in clause (a) above entered into with a bank meeting the
         qualifications described in clause (b) above; (e) securities with
         maturities of six months or less from the date of acquisition issued or
         fully guaranteed by any state, commonwealth or territory of the United
         States of America, or by any political subdivision or taxing authority
         thereof,

                                       9
<PAGE>

         and rated at least A by S&P or A by Moody's; or (f) money market mutual
         funds that invest primarily in the foregoing items.

                  "Permitted Transferees" has the meaning given that term in
         Section 9.1(f).

                  "Priority Return" means an amount in the nature of interest at
         the rate of 10% per annum, compounded annually, on the amount from time
         to time of the Unrecovered ML Investment or the Unrecovered UBS
         Investment, as the case may be. For the avoidance of doubt, Priority
         Return shall continue to compound annually notwithstanding that the
         Unrecovered ML Investment or the Unrecovered UBS Investment, as the
         case may be, has been reduced to zero.

                  "Pro Rata Amount" has the meaning given that term in Section
         3.5(a).

                  "Profits" means items of Company income and gain determined
         according to Code Section 703(a).

                  "Proportionate Interest" has the meaning given that term in
         Section 9.2(b).

                  "Proposed Sale" has the meaning given that term in Section
         9.2(a).

                  "Proposed Transferee" has the meaning given that term in
         Section 9.3(a).

                  "Purchase Agreement" means the Stock Purchase Agreement dated
         as of the date hereof, between the Company and KAT Holdings, Inc. and
         acknowledged and agreed to by KAT Holdings, L.P., ML IBK Positions,
         Inc., Merrill Lynch Ventures L.P. 2001 and UBS Capital Americas II,
         LLC.

                  "Qualified Public Offering" means the consummation of an
         underwritten public offering of the Company's common equity securities
         or of Operating Company Shares that are listed for trading on the New
         York Stock Exchange or the NASDAQ National Market (or any successor
         exchange, market or organization thereto) resulting (i) in net proceeds
         for the Company or the Operating Company, as the case may be, of at
         least $100,000,000, and (ii) a price per Company's common equity
         security or per Operating Company Share, as the case may be, of at
         least $2,000, as adjusted for any stock dividend, split, reverse split,
         combination, reclassification, merger, recapitalization or other
         transaction.

                  "Reclassified Securities" has the meaning given that term in
         Section 9.8(b).

                  "Registration Rights Agreement" means the Registration Rights
         Agreement dated as of December 10, 2003 by and among the Operating
         Company and the other parties thereto, as amended from time to time.

                  "Related Party" means any (i) Member, Representative or
         Officer of the Company, (ii) any shareholder, officer, director or Key
         Executive of the Operating Company or any of its Subsidiaries, or (iii)
         any Affiliate of any such Person.

                                       10
<PAGE>

                  "Representative" means each of the then current Kenner
         Representatives, ML Representative, UBS Representative and Special
         Kenner Representatives, each as defined in Section 5.2.

                  "Rollover Amount" means $10,646,279.

                  "Rollover Shares" means (i) 10,646.279 Operating Company
         Shares held on the date hereof (after giving effect to the Merger
         pursuant to the Merger Agreement) by ML IBK Positions, Inc., and (ii)
         any equity securities of the Operating Company issued with respect to
         the Operating Company Shares referred to in clause (i) by way of a
         payment-in kind, stock dividend, or stock split or in connection with a
         recapitalization.

                  "Rule 144" means Rule 144 promulgated under the Securities Act
         or any successor provision.

                  "Sale of the Company" means a sale of the Company pursuant to
         which the acquiror(s) acquire(s) (i) 100% of the Units then outstanding
         on a fully diluted basis (assuming the exercise, exchange or
         conversion, as the case may be, of all the then outstanding Convertible
         Securities of the Company) (whether by merger, consolidation, sale or
         transfer of the Company's equity securities or otherwise) or (ii) all
         or substantially all of the Company's assets on a consolidated basis
         (whether by way of sale of equity securities or assets).

                  "Sale of the Operating Company" means a sale of the Operating
         Company pursuant to which the acquiror(s) acquire(s) (i) 100% of the
         Operating Company Shares then outstanding on a fully diluted basis
         (assuming the exercise, exchange or conversion, as the case may be, of
         all the then outstanding Convertible Securities of the Operating
         Company) (whether by merger, consolidation, sale or transfer of the
         Company's equity securities or otherwise), or (ii) all or substantially
         all of the Operating Company's assets on a consolidated basis (whether
         by way of sale of equity securities or assets).

                  "SEC" means the Securities and Exchange Commission or any
         successor agency thereto that administers the Securities Act and the
         Exchange Act.

                  "Selling Member" has the meaning given that term in Section
         9.2(a).

                  "Securities Act" means the Securities Act of 1933, as amended
         from time to time.

                  "Special Kenner Representatives" has the meaning given that
         term in Section 5.2(e).

                  "Stockholders Agreement" means the Stockholders Agreement of
         the Operating Company dated as of the date hereof, among the Operating
         Company, the Company and the other parties thereto, in substantially
         the form of Exhibit C hereto, as the same may be amended or modified.

                                       11
<PAGE>

                  "Subsidiary" or "subsidiary" of a Person is any corporation,
         partnership, association or other entity that is directly or indirectly
         through one or more intermediaries, Controlled by such Person.

                  "Tag Along Notice " has the meaning given that term in Section
         9.3(a).

                  "Tag Along Percentage" has the meaning given that term in
         Section 9.3(c).

                  "Tag Along Sale" has the meaning given that term in Section
         9.3(a).

                  "Tax Matters Member" has the meaning given to that term in
         Section 8.2.

                  "Taxable Year" means the Company's taxable year ending
         December 31 (or part thereof, in the case of the Company's last taxable
         year), or such other year as is (i) required by Section 706 of the Code
         or (ii) determined by Board.

                  "Transfer" means any sale, assignment, transfer, exchange,
         mortgage, pledge, grant of a security interest in, or other disposition
         of or encumbrance (including by operation of law) and the terms
         "Transferee," "Transferor," "Transferring," and "Transferred" shall
         have correlative meanings.

                  "Transferring Member" has the meaning given that term in
         Section 9.3(a).

                  "UBS Carry Percentage" means 7.0000%.

                  "UBS Closing Fee" means a fee of $1,000,000 payable by the
         Operating Company or any of its Subsidiaries to UBS Capital Americas,
         LLC or any of its Affiliates within 60 days after the date hereof
         pursuant to the UBS Fee Agreement.

                  "UBS Fee Agreement" means the Fee Agreement dated as of
         December 10, 2003, among the Operating Company, Atrium Companies, Inc.
         and UBS Capital Americas, LLC, as the same may be amended or modified.

                  "UBS Group" means initially UBS Capital Americas II, LLC and
         shall include (i) any Affiliate of UBS Capital Americas II, LLC which
         becomes a Member or a stockholder of the Operating Company pursuant to
         the terms of this Agreement or the Stockholders Agreement, and (ii) any
         Transferee of Units, Operating Company Shares or Convertible Securities
         of UBS Capital Americas II, LLC or any of their respective Transferees
         pursuant to a Transfer made in accordance with the terms and conditions
         hereof or of the Stockholders Agreement and which becomes a Member
         pursuant to the terms of this Agreement or a stockholder of the
         Operating Company pursuant to the terms of the Stockholders Agreement.
         As of any time, the act of those Persons holding a majority of the
         Operating Company Share Equivalents held by the UBS Group as of such
         time shall be the act of the UBS Group for all purposes under this
         Agreement (including for purposes of Sections 5.2, 5.14, 9.4, 9.5, 9.6
         and 9.8) and the Stockholders Agreement.

                  "UBS Investment" means $75,000,000.

                                       12
<PAGE>

                  "UBS Investment Percentage" means 29.8266%.

                  "UBS Member" means any Member comprising part of the UBS
         Group.

                  "UBS Nominee and Sharing Agreement" means the Atrium Investor
         Nominee and Sharing Agreement, between UBS Capital Americas II, LLC and
         KAT Group, L.P, in substantially the form attached hereto as Exhibit D,
         as the same may be amended or modified.

                  "UBS Representative" has the meaning given that term in
         Section 5.2(d).

                  "UBS Subject Distributions" means, as of the date of
         determination, the sum of (i) the aggregate distributions received by
         the UBS Members pursuant to Section 4.2(c), plus (ii) the distributions
         received by the Investor (as such term is defined in the UBS Nominee
         and Sharing Agreement) pursuant to Section 2.2 of the UBS Nominee and
         Sharing Agreement.

                  "Unrecovered ML Investment" of the ML Group as of any date
         shall mean the ML Investment less the total ML Subject Distributions
         received by the ML Members on or prior to such date.

                  "Unrecovered UBS Investment" of the UBS Group as of any date
         shall mean the UBS Investment less the total UBS Subject Distributions
         received by the UBS Members on or prior to such date.

                  "Unit" means a Membership Interest of a Member in the Company
         representing a fractional part of the Membership Interests of all
         Members.

                  "Unit Purchase Agreement" means the Unit Purchase Agreement
         dated as of the date hereof, among the Company, KAT Holdings, L.P., ML
         IBK Positions, Inc., Merrill Lynch Ventures L.P. 2001 and UBS Capital
         Americas II, LLC.

Other terms defined in this Agreement have the meanings so given them.

                                       13
<PAGE>

                  1.2 GENERAL INTERPRETATIVE PROVISIONS. Terms for which
meanings are defined in this Agreement shall apply equally to the singular and
plural forms of the terms defined. Whenever the context may require, any pronoun
shall include the corresponding masculine and feminine forms. Words such as
"herein", "hereafter", "hereto", "hereby" and "hereunder", when used with
reference to this Agreement, refer to this Agreement as a whole, unless the
context otherwise requires. The words "include", "includes", "included",
"including" and "such as" shall be construed as if followed by the phrase
"without being limited to". No distinction in interpretation shall be made
between the terms "shall" and "will". A reference to a particular gender means a
reference to any gender.

                                   ARTICLE II
                                  ORGANIZATION

                  2.1 FORMATION. The Company has been organized as a Delaware
limited liability company by the execution and filing of the Certificate by an
authorized person (within the meaning of the Act), under and pursuant to the
Act. The rights, powers, duties, obligations and liabilities of the Members
shall be determined pursuant to the Act and this Agreement. To the extent that
the rights, powers, duties, obligations and liabilities of any Member are
different by reason of any provision of this Agreement than they would be in the
absence of such provision, this Agreement shall, to the extent permitted by the
Act, control.

                  2.2 NAME. The name of the Company is "ATR Acquisition, LLC"
and all Company business shall be conducted in that name or in such other names
that comply with applicable law as the Board may select from time to time.

                  2.3 REGISTERED OFFICE; REGISTERED AGENT; PRINCIPAL OFFICE;
OTHER OFFICES. The registered office of the Company required by the Act to be
maintained in the State of Delaware shall be the office of the initial
registered agent named in the Certificate or such other office (which need not
be a place of business of the Company) as the Board may designate from time to
time in the manner provided by law. The registered agent of the Company in the
State of Delaware shall be the initial registered agent named in the Certificate
or such other Person or Persons as the Board may designate from time to time in
the manner provided by law. The principal office of the Company shall be at such
place as the Board may designate from time to time, which need not be in the
State of Delaware, and the Company shall maintain records there. The Company may
have such other offices as the Board may designate from time to time.

                  2.4 PURPOSES AND POWERS. The nature or purpose of the business
to be conducted or promoted by the Company is limited to owning, managing,
supervising and/or disposing of the Operating Company Shares. The Company may
engage in any and all activities necessary, desirable or incidental to the
accomplishment of the foregoing. Notwithstanding anything herein to the
contrary, nothing set forth herein shall be construed as authorizing the Company
to possess any purpose or power, or to do any act or thing, forbidden by law to
a limited liability company organized under the laws of the State of Delaware.

                  2.5 FOREIGN QUALIFICATION. The Board shall cause the Company
to comply with all requirements necessary to qualify the Company as a foreign
limited liability company in any jurisdiction in which the Company owns property
or transacts business to the extent, in the

                                       14
<PAGE>

reasonable judgment of the Board, such qualification or registration is
necessary or advisable for the protection of the limited liability of the
Members or to permit the Company lawfully to own property or transact business.
The Board may and, at the request of the Board or any Officer, each Member
shall, execute, acknowledge, swear to and deliver any or all certificates and
other instruments conforming with this Agreement that are necessary or
appropriate to qualify, continue or terminate the Company as a foreign limited
liability company in all such jurisdictions in which the Company may conduct
business.

                  2.6 TERM. The term of the Company commenced on the date the
Certificate was filed with the office of the Secretary of State of Delaware and
shall continue in existence until its dissolution pursuant to Section 10.1.

                  2.7 NO STATE-LAW PARTNERSHIP. The Members intend that the
Company shall not be a partnership (including, without limitation, a limited
partnership) or joint venture, and that no Member shall be a partner or joint
venturer of any other Member, for any purposes other than federal and other
applicable tax purposes, and this Agreement shall not be construed to the
contrary. The Members intend that the Company shall be treated as a partnership
for federal and other applicable tax purposes, and each Member and the Company
shall file all tax returns and shall otherwise take all tax and financial
reporting positions in a manner consistent with such treatment.

                                   ARTICLE III
               MEMBERSHIP; CAPITAL CONTRIBUTIONS; ADDITIONAL UNITS

                  3.1 MEMBERS.

                           (a) Names, etc. Subject to the following sentence,
the name, residence, business or mailing addresses, Capital Contributions and
the Units of each Member are set forth on Schedule A, as such Schedule shall be
amended from time to time in accordance with the terms of this Agreement. Any
reference in this Agreement to Schedule A shall be deemed to be a reference to
Schedule A as amended and in effect from time to time. Each Person listed on
Schedule A as of the date of this Agreement, upon (i) his, her or its execution
of this Agreement or counterpart thereof and (ii) receipt of such Person's
Capital Contribution as set forth on Schedule A, is hereby admitted to the
Company as a Member. Additional Members shall be admitted to the Company on the
terms and subject to the conditions set forth elsewhere in this Agreement.

                           (b) Representations and Warranties of Members. Each
Member hereby represents and warrants to and acknowledges with the Company that:
(i) such Member has such knowledge and experience in financial and business
matters and is capable of evaluating the merits and risks of an investment in
the Company and making an informed investment decision with respect thereto;
(ii) such Member is able to bear the economic and financial risk of an
investment in the Company for an indefinite period of time; (iii) such Member is
acquiring interests in the Company for investment only and not with a view to,
or for resale in connection with, any distribution to the public or public
offering thereof; (iv) the interests in the Company have not been registered
under the securities laws of any jurisdiction and cannot be disposed of unless
they are subsequently registered and/or qualified under

                                       15
<PAGE>

applicable securities laws or they are disposed of in compliance with an
applicable exemption from such registration and qualification and the provisions
of this Agreement have been complied with; (v) such Member is an "accredited
investor" as such term is defined in the Securities Act and a "qualified
purchaser" as such term is defined in the Investment Company Act of 1940, as
amended; (vi) the execution, delivery and performance of this Agreement have
been duly authorized by such Member and do not require such Member to obtain any
consent or approval that has not been obtained and do not contravene or result
in a default under any provision of any law or regulation applicable to such
Member or other governing documents or any agreement or instrument to which such
Member is a party or by which such Member is bound; and (vii) this Agreement is
valid, binding and enforceable against such Member in accordance with its terms.

                  3.2 INITIAL CAPITAL CONTRIBUTIONS. Each Member shall make a
Capital Contribution to the Company in cash in the amount set forth opposite
such Member's name on Schedule A hereto. Upon receipt of the Capital
Contribution set forth opposite such Member's name on Schedule A, each Member
shall be deemed to own the number of Units set forth opposite such Member's name
on Schedule A.

                  3.3 ADDITIONAL CAPITAL CONTRIBUTIONS; LOANS BY MEMBER. Except
for the Capital Contributions of the Members required to be made pursuant to
Section 3.2, no Member shall be required to make any Capital Contributions
without the unanimous written consent of the Members and no Member shall be
permitted to make any Capital Contributions other than in compliance with the
other provisions of this Agreement. No Member, as such, shall be required to
lend any funds to the Company.

                  3.4 UNITS; ISSUANCE OF ADDITIONAL UNITS; ADDITIONAL MEMBERS.

                           (a) Units. The Membership Interests shall be
represented by Units.

                           (b) Additional Units. The Board shall have the right
to cause the Company to issue to or sell to any Person (including Members and
Affiliates of Members) any of the following (which for purposes of this
Agreement shall be "Additional Units"): (i) additional Units in the Company
(including new classes or series thereof having different rights); or (ii)
Convertible Securities of the Company. The Board shall determine the terms and
conditions governing the issuance of such Additional Units, including the number
and designation of such Additional Units, the preference (with respect to
distributions, in liquidation or otherwise) over any other Units and any
required contributions in connection therewith.

                           (c) Additional Members and Units. In order for a
Person to be issued additional Units and be admitted as a Member of the Company
with respect to an Additional Unit: (i) such Person shall have delivered to the
Company a written undertaking in the form of Exhibit B to be bound by the terms
and conditions of this Agreement and shall have delivered such other documents
and instruments as the Board determines to be necessary or appropriate in
connection with the issuance of such Additional Unit to such Person or to effect
such Person's admission as a Member; and (ii) the Board or the secretary of the
Company shall amend Schedule A without the further vote, act or consent of any
other Person to reflect such new Person as a Member and shall provide a copy of
such amended Schedule A to each Member.

                                       16
<PAGE>

Upon the amendment of Schedule A, such Person shall be listed as such on the
books and records of the Company and thereupon shall be deemed to have been
issued its Units. If an Additional Unit is issued to an existing Member, the
Board or the secretary of the Company shall amend Schedule A without the further
vote, act or consent or any other Person to reflect the issuance of such
Additional Unit, shall provide a copy of such amended Schedule A to each Member,
and, upon the amendment of such Schedule A, such Member shall be deemed to have
been issued its Additional Unit.

                           (d) This Section 3.4 is subject to Section 3.5 and
Section 5.14.

                  3.5 PREEMPTIVE RIGHTS.

                           (a) If the Company proposes to issue any Units or
Convertible Securities of the Company to any Person after the date hereof (the
"New Units"), each Member shall have the right to purchase all or a portion of
that number of New Units equal to the product of (i) the total number of New
Units proposed to be issued, multiplied by (ii) a fraction, (A) the numerator of
which is the number of Units held by such Member immediately prior to the
proposed issuance on a fully diluted basis (assuming the exercise, exchange or
conversion, as the case may be, of all the then exercisable Convertible
Securities of the Company held by such Member) and (B) the denominator of which
is the total number of Units which are held by all Members immediately prior to
the proposed issuance on a fully diluted basis (assuming the exercise, exchange
or conversion, as the case may be, of all the then exercisable Convertible
Securities of the Company held by all Members) (such amount, the "Pro Rata
Amount"); provided, however, that if a Member elects not to exercise its rights
pursuant to this Section 3.5, whether in full or in part, each other Member
shall have the right to subscribe for the unsubscribed portion of such
non-electing Member's Pro Rata Amount (the "New Units Excess Amount"). If the
subscription by each other Member for the non-electing Member's New Units Excess
Amount exceeds such New Units Excess Amount, each other Member shall be entitled
to subscribe for the pro rata portion of such New Units Excess Amount based on
the ratio that the number of Units held by such other Member on such date on a
fully diluted basis (assuming the exercise, exchange or conversion, as the case
may be, of all the then exercisable Convertible Securities of the Company held
by such other Member) bears to the aggregate number of Units held by all such
other Members on a fully diluted basis (assuming the exercise, exchange or
conversion, as the case may be, of all the then exercisable Convertible
Securities of the Company held by all such other Members) (with the provisions
of this sentence to be applied repeatedly, until all of the New Units have been
allocated, or no Member wishes to subscribe for any of the New Units that remain
unallocated).

                           (b) The Company shall give each Member written notice
of any proposed issuance of New Units (the "Issuance Notice") describing the
price and terms upon which the Company proposes to issue such New Units. During
the 15-day period following the date of delivery of the Issuance Notice (the
"Election Period") each Member may exercise his, her or its right to purchase
New Units in accordance with this Section 3.5, for the price and upon the terms
and conditions specified in the Issuance Notice by giving written notice to the
Company and stating therein the quantity of New Units to be purchased.

                                       17
<PAGE>

                           (c) In the event that any Member fails to exercise
its right to purchase any New Units which it is entitled to purchase under
Section 3.5(a), the Company shall have 90 days following the Election Period to
issue the New Units not elected to be purchased by Members at the price and upon
terms not more favorable to the prospective purchasers of such New Units than
those specified in the Issuance Notice. In the event the Company has not issued
the New Units within such 90-day period, the Company shall not thereafter issue
or otherwise Transfer such New Units without first offering such New Units to
the Members in the manner provided in this Section 3.5.

                           (d) If Members and third parties do not elect to
purchase all of the New Units set forth in the Issuance Notice, then the Company
may elect not to issue, and any Member may elect not to purchase, any New Units.
If a Member elects to purchase any New Units pursuant to this Section 3.5, the
closing of such purchase shall occur concurrently with any purchase of the New
Units set forth in the Issuance Notice that other Members and third parties have
elected to purchase at such time (but not earlier than 30 days after the date of
the Issuance Notice) and at such location selected by the Company. At the
consummation of any purchase and sale of New Units pursuant to this Section 3.7:
(i) the Company shall deliver such documents or instruments reasonably required
by counsel for the Member to consummate such purchase and sale; (ii) the Member
will deliver the cash consideration payable by wire transfer of immediately
available funds to an account or accounts designated in writing by the Company
(such designation to be made no later than two Business Days prior to the date
of such consummation); (iii) the Company shall deliver to the Member a written
representation that the New Units are being purchased and sold free and clear of
any and all liens or other encumbrances; and (iv) the Member shall deliver to
the Company such written investment representations as may reasonably be
required by counsel to the Company for securities laws purposes and all other
applicable representations and warranties as required of other purchasers of New
Units.

                           (e) Any right of a Member to acquire New Units of the
Company pursuant to this Section 3.5 may be assigned by such Member to any of
its Affiliates.

                           (f) Any right of the Company to acquire Operating
Company Shares or Convertible Securities of the Operating Company pursuant to
the preemptive rights set forth in Article VI of the Stockholders Agreement or
otherwise are hereby assigned to the Members on a pro rata basis, based on their
proportionate ownership of outstanding Units. Each Member shall, in its sole and
absolute discretion, be entitled to exercise any such rights.

                           (g) No additional Member shall be admitted to the
Company pursuant to this Section 3.5 unless and until the conditions of Section
3.4(c) are satisfied.

                           (h) Anything in this Section 3.5 to the contrary
notwithstanding, no issuance of New Units may be made without prior compliance
in full with the requirements of Section 5.14(b)(i).

                                       18
<PAGE>

                  3.6 LIABILITY OF MEMBERS.

                           (a) General. In no event shall any Member (or former
Member) have any liability for the repayment or discharge of the debts and
obligations of the Company, or for the repayment of any Capital Contribution of
any other Member, or, subject to Section 3.6(b), be obligated to make any
contribution to the Company.

                           (b) Liability for Amounts Wrongfully Distributed. The
Members hereby agree that, except as otherwise expressly provided herein or
required by applicable law, no Member shall have an obligation to return money
or other property paid or distributed to such Member in violation of the Act.
The agreement set forth in the immediately preceding sentence shall be deemed to
be a compromise for purposes of Section 18-502(b) of the Act. However, if any
court of competent jurisdiction holds that, notwithstanding the provisions of
this Agreement, any Member is obligated to make any such return, such obligation
shall be the obligation of such Member and not of any other Person.

                  3.7 MEETINGS; ACTION BY THE MEMBERS.

                           (a) Meetings.

                           (i) The Members shall meet at least annually to
                  discuss Company matters and to conduct voting on such matters
                  as require the consent of the Members. Such meetings shall
                  take place on such date, at such time and at such location as
                  the Board may specify in a notice delivered to each Member at
                  least 10 days prior to the date specified in such notice. In
                  addition, any Member or Members holding an aggregate of at
                  least 10% of the Operating Company Share Equivalents may call
                  a special meeting of all the Members at any time by giving
                  notice in the manner specified in the preceding sentence. A
                  Member may waive notice of any meeting, before or after the
                  date of the meeting, by delivering a signed waiver to the
                  Company for inclusion in the minutes of the Company. A
                  Member's attendance at any meeting, in person or by proxy: (1)
                  waives objection to lack of notice or defective notice of the
                  meeting, unless the Member at the beginning of the meeting
                  objects to holding the meeting or transacting business at the
                  meeting, and (2) waives objection to consideration of a
                  particular matter at the meeting that is not within the
                  purposes described in the meeting notice, unless the Member
                  objects to considering the matter when it is presented.

                           (ii) Any action required or permitted to be taken at
                  any annual or special meeting of Members under Section
                  3.7(a)(i) may be taken without a meeting, without prior notice
                  and without a vote if a consent in writing, setting forth the
                  action so taken, shall be signed by or on behalf of Members
                  having not less than the minimum number of votes that would be
                  necessary to authorize or take such action at a meeting at
                  which all Members entitled to vote on such matter were present
                  and voted.

                           (b) Special Section 5.14(b) Meetings.

                                       19
<PAGE>

                           (i) The Kenner Group, the ML Group and the UBS Group
                  shall hold special meetings to conduct voting on any matter
                  requiring the consent of such Members pursuant to Section
                  5.14(b). Such meetings shall be called by the Board as soon as
                  practicable after any Atrium Group Company seeks the consent
                  of such Members pursuant to Section 5.14(b). Such meetings
                  shall take place on such date, at such time and at such
                  location as the Board may specify in a notice delivered to
                  each Member at least two days prior to the date specified in
                  such notice. In addition, any of the Kenner Group, the ML
                  Group or the UBS Group may call a special meeting of such
                  Members to conduct voting on any matter requiring the consent
                  of such Members pursuant to Section 5.14(b) at any time after
                  becoming aware that any Atrium Group Company contemplates to
                  take or cause to be taken any action requiring the consent of
                  such Members pursuant to Section 5.14(b) by giving notice in
                  the manner specified in the preceding sentence. A Member may
                  waive notice of any meeting under this Section 3.7(b)(i),
                  before or after the date of the meeting, by delivering a
                  signed waiver to the Company for inclusion in the minutes of
                  the Company. A Member's attendance at any meeting, in person
                  or by proxy: (1) waives objection to lack of notice or
                  defective notice of the meeting under this Section 3.7(b)(i),
                  unless the Member at the beginning of the meeting objects to
                  holding the meeting or transacting business at the meeting,
                  and (2) waives objection to consideration of a particular
                  matter at the meeting that is not within the purposes
                  described in the meeting notice, unless the Member objects to
                  considering the matter when it is presented.

                           (ii) Any action required or permitted to be taken at
                  a meeting under Section 3.7(b)(i) may be taken without a
                  meeting, without prior notice and without a vote if a consent
                  in writing, setting forth the action so taken, shall be signed
                  by or on behalf of all of the Kenner Group, the ML Group and
                  the UBS Group.

                           (iii) The rights of the Kenner Group, the ML Group or
                  the UBS Group, as the case may be, to participate in a meeting
                  under Section 3.7(b)(i) (or to approve an action as provided
                  in Section 3.7(b)(ii)) shall terminate as such time as the
                  Kenner Group, the ML Group or the UBS Group, as the case may
                  be, ceases to own at least 10% of the Operating Company Share
                  Equivalents then outstanding.

                           (c) Conduct of Meeting. The Members (including in
respect of a meeting contemplated by Section 3.7(b) may meet in person or by
means of conference telephone or similar communications equipment by means of
which all persons participating in the meeting can hear and speak to each other.
Each Member may participate in any meeting by means of conference telephone or
similar communications equipment by means of which all persons participating in
the meeting can hear and speak to each other, and such participation in a
meeting shall constitute presence in person at the meeting.

                           (d) Record Date. The record date for the purpose of
determining the Members entitled to notice of a Member's meeting, for demanding
a special meeting, for voting,

                                       20
<PAGE>

or for taking any other action (in each case other than pursuant to Section
3.7(b)) shall be the 15th day prior to the date of the meeting or other action.

                           (e) Proxies. A Member may appoint a proxy to vote or
otherwise act for such Member pursuant to a written appointment form executed by
the Member or the Member's duly authorized attorney-in-fact. An appointment of a
proxy is effective when received by the Board. A proxy appointment is valid for
eleven (11) months unless otherwise expressly stated in the appointment form.

                           (f) Quorum. At any meeting of Members, the presence
of Members entitled to cast at least a majority of the total votes of all the
Members entitled to vote at such meeting constitutes a quorum; provided,
however, that in the case of a meeting contemplated by Section 3.7(b), the
presence of at least one Kenner Member designated in writing by the Kenner
Group, one ML Member designated in writing by the ML Group and one UBS Member
designated in writing by the UBS Group shall constitute a quorum.

                  3.8 ADJOURNMENT. At any meeting of Members of the Company, if
less than a majority of the total number of votes entitled to be cast by all
Members is present, a majority of the Members present in person or by proxy and
entitled to vote, shall have the power to adjourn the meeting to another time,
place and date without notice other than by announcement at the meeting so
adjourned. Any business may be transacted at any adjourned meeting that could
have been transacted at the meeting originally noticed, but only those Members
entitled to vote at the meeting originally noticed shall be entitled to vote at
any adjourned meeting. Notwithstanding the foregoing, if the adjournment is for
more than thirty (30) days from the date of the meeting originally noticed, or
if after the adjournment a new record date is fixed for the adjourned meeting, a
notice of the adjourned meeting shall be given to each Member of record entitled
to notice hereunder and all such Members shall be entitled to vote as otherwise
provided herein.

                  3.9 VOTING RIGHTS. Except as specifically provided herein
(including in Section 5.14) or otherwise required by applicable law, the Members
shall be entitled to one vote per Unit held by them on all matters to be voted
on by the Members.

                  3.10 MEMBER EXPENSES. The Company shall cause the Operating
Company to reimburse each Member and its representatives and agents for any
reasonable out-of pocket expenses incurred in connection with the monitoring of
its investment in the Atrium Group Companies. The Members hereby acknowledge and
authorize the execution, delivery and performance, all on behalf of the
Operating Company, of the Management Agreement, the ML Fee Agreement and the UBS
Fee Agreement.

                                   ARTICLE IV
                DISTRIBUTIONS; ALLOCATIONS OF PROFITS AND LOSSES

                  4.1 GENERALLY. Subject to Section 10.2, any distributions of
cash or other assets by the Company to the Members shall be made in accordance
with this Article IV.

                  4.2 DISTRIBUTIONS. Subject to the provisions of Section 18-607
of the Act and Sections 4.5, 5.14 and 10.2, distributions shall be made to the
Members when and as determined by the Board; provided, however, that
distributions with respect to Operating Company Share

                                       21
<PAGE>

Proceeds shall be made to the Members (x) in the case of cash or cash
equivalents, promptly after the receipt thereof by the Company, (y) in the case
of Marketable Securities, subject to compliance with applicable law, within two
Business Days after the receipt thereof by the Company or within two Business
Days after the receipt by the Company of the Final Valuation with respect
thereto, as the case may be; provided, however, that any distribution under this
Section 4.2 (including with respect to Operating Company Share Proceeds) shall
be subject to the retention and establishment of reserves of, or payment to
third parties of, such funds as the Board reasonably deems necessary for the
reasonable business needs of the Company (including the payment or the making of
provision for the payment when due of the Company's obligations). Anything to
the contrary herein notwithstanding, the Company shall not distribute securities
(other than Marketable Securities). The provisions of this Section shall not
apply to future Capital Contributions. Distributions shall be made to the
Members as provided in clauses (a), (b) and (c) below, on a pari passu basis, in
each case multiplying the aggregate amount being distributed by the appropriate
investment percentage, as follows:

                           (a) the Kenner Investment Percentage, with the
product to be distributed to the Kenner Members, pro rata based on their
proportionate ownership of the outstanding Units held by the Kenner Group;

                           (b) the ML Investment Percentage, with the product to
be distributed as follows:

                           (i) first, to the ML Members, pro rata based on their
                  proportionate ownership of the outstanding Units held by the
                  ML Group until the ML Members have received ML Subject
                  Distributions equal to the sum of (x) the ML Investment plus
                  (y) the Priority Return;

                           (ii) second, to the Carry Member until the Carry
                  Member has received pursuant to this clause (ii) and Section
                  2.2(a)(ii) of the ML Nominee and Sharing Agreement an amount
                  equal to the product of (x) the ML Carry Percentage times (y)
                  the sum of (A) the Priority Return distributed to the ML
                  Members pursuant to Section 4.2(b)(i)(y) plus (B) the Priority
                  Return distributed to the Investor (as such terms are defined
                  in the ML Nominee and Sharing Agreement) pursuant to Section
                  2.2(a)(i)(y) of the ML Nominee and Sharing Agreement plus (C)
                  the amount distributed to the Carry Member pursuant to this
                  clause (ii) plus (D) the amount distributed to the Carry
                  Member pursuant to Section 2.2(a)(ii) of the ML Nominee and
                  Sharing Agreement; and

                           (iii) third, the ML Carry Percentage to the Carry
                  Member and the balance to the ML Members, pro rata based on
                  their proportionate ownership of the outstanding Units held by
                  the ML Group;

                           (c) the UBS Investment Percentage, with the product
to be distributed as follows:

                           (i) first, to the UBS Members, pro rata based on
                  their proportionate ownership of the outstanding Units held by
                  the UBS Group until the UBS

                                       22
<PAGE>

                  Members have received UBS Subject Distributions equal to the
                  sum of (x) the UBS Investment plus (y) the Priority Return;

                           (ii) second, to the Carry Member until the Carry
                  Member has received pursuant to this clause (ii) and Section
                  2.2(a)(ii) of the UBS Nominee and Sharing Agreement an amount
                  equal to the product of (x) the UBS Carry Percentage times (y)
                  the sum of (A) the Priority Return distributed to the UBS
                  Members pursuant to Section 4.2(c)(i)(y) plus (B) the Priority
                  Return distributed to the Investor (as such terms are defined
                  in the UBS Nominee and Sharing Agreement) pursuant to Section
                  2.2(a)(i)(y) of the UBS Nominee and Sharing Agreement plus (C)
                  the amount distributed to the Carry Member pursuant to this
                  clause (ii) plus (D) the amount distributed to the Carry
                  Member pursuant to Section 2.2(a)(ii) of the UBS Nominee and
                  Sharing Agreement; and

                           (iii) third, the UBS Carry Percentage to the Carry
                  Member and the balance to the UBS Members, pro rata based on
                  their proportionate ownership of the outstanding Units held by
                  the UBS Group.

                  4.3 ALLOCATION OF PROFITS AND LOSSES. For each Fiscal Year of
the Company, after adjusting each Member's Capital Account for all Capital
Contributions and distributions during such Fiscal Year, all Profits and Losses
shall be allocated to the Members' Capital Accounts as follows:

                           (a) Profits. Profits shall be allocated among the
Members' Capital Accounts in the following priority:

                           (i) first, among the Members with Capital Account
                  deficit balances until those deficit balances are reduced to
                  zero; and

                           (ii) thereafter, in such amount as will increase the
                  Capital Account balance of each Member to the amount such
                  Member would be entitled to receive under Section 4.2 if there
                  were an amount available for distribution equal to the sum of
                  (x) the aggregate Capital Account balances of the Members
                  before the allocation pursuant to this Section 4.3(a)(ii) plus
                  (y) the amount of Profits to be so allocated.

                           (b) Losses. Losses shall be allocated among the
Members' Capital Accounts in the following priority:

                           (i) first, in such amount as will decrease the
                  Capital Account of each Member to the amount such Member would
                  be entitled to receive under Section 4.2 if there were an
                  amount available for distribution equal to (x) the aggregate
                  Capital Account balances of the Members before the allocation
                  pursuant to this Section 4.3(b)(i) less (y) the amount of
                  Losses to be so allocated; and

                           (ii) thereafter, among the Members, pro rata based on
                  their proportionate ownership of the outstanding Units.

                                       23
<PAGE>

                  4.4 TAX ALLOCATIONS. The income, gains, losses, deductions and
expenses of the Company shall be allocated, for federal, state and local income
tax purposes, among the Members in accordance with the allocation of such
income, gains, losses, deductions and expenses among the Members for computing
their Capital Accounts, except that if any such allocation is not permitted by
the Code or other applicable law, the Company's subsequent income, gains,
losses, deductions and expenses shall be allocated among the Members for tax
purposes to the extent permitted by the Code and other applicable law, so as to
reflect as nearly as possible the allocation set forth herein in computing their
Capital Accounts.

                  4.5 OPTIONAL REDEMPTION OF UNITS.

                           (a) Subject to compliance with applicable law
(including the applicable requirements of the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended (the "HSR Act")), at any time and from time
to time after the date hereof, any Member may in its sole and absolute
discretion elect to receive distributions from the Company consisting of up to
such Member's pro rata portion of the Operating Company Shares then held by the
Company (based on the proportion that the Units held by such Member (assuming
the exercise, exchange or conversion, as the case may be, of all the then
exercisable Convertible Securities of the Company held by such Member)
immediately prior to any such distribution hereunder bears to the total number
of issued and outstanding Units (assuming the exercise, exchange or conversion,
as the case may be, of all the then exercisable Convertible Securities of the
Company held by all Members)). A Member desiring to make such an election (the
"Electing Member") shall deliver written notice of such election to the Company
at least 30 days prior to any such proposed distribution. Upon receipt of such
notice, the Company (and, if applicable, any other Non-Electing Member) shall
take such actions as are reasonably required to effectuate such distribution to
the Electing Member (including causing the Operating Company to give effect to
the Transfer of the applicable Company's Operating Company Shares to the
Electing Member); provided, however, that as a condition to the distribution to
any Electing Member of any Operating Company Shares pursuant to this Section
4.5, such Electing Member shall (i) enter into and otherwise become a party to
the Stockholders Agreement, and (ii) if applicable, the ML Nominee and Sharing
Agreement or the UBS Nominee and Sharing Agreement.

                           (b) The Company shall be responsible for and shall
reimburse (or shall cause the Operating Company or its Subsidiaries to
reimburse) each Electing Member for its reasonable out-of-pocket fees and
expenses (including legal fees and expenses) incurred in connection with an
election pursuant to Section 4.5(a), including any filing fees associated with
any filing that the Electing Member may be required to make with the Federal
Trade Commission and the Antitrust Division of the United States Department of
Justice under the HSR Act; provided, however, that the Company shall not be
obligated to reimburse an Electing Member more than once for its fees and
expenses with respect to a filing by such Member under the HSR Act.

                           (c) The distribution of Operating Company Shares
pursuant to Section 4.5(a), shall, automatically and without the necessity of
any action by any Person, effect a redemption of such number of the Electing
Member's Units as is necessary so that its aggregate percentage ownership of the
Operating Company (i.e., directly through the ownership of securities in the
Operating Company and indirectly through the ownership of securities in the

                                       24

<PAGE>

Company) is the same immediately prior to and after giving effect to such
distribution of Operating Company Shares; provided, however, that the Board
shall make any equitable adjustments as is necessary to avoid the redemption of
fractional Units. Upon any such redemption of Units held by the Electing Member
pursuant to this Section 4.5, the Board or the secretary of the Company shall
amend Schedule A without the further vote, act or consent of any other Person to
reflect such redemption and shall provide a copy of such amended Schedule A to
each Member.

                           (d) Notwithstanding anything herein to the contrary,
each Member and the Company acknowledges and agrees that upon and as a condition
to making a distribution of Operating Company Shares in accordance with this
Section 4.5, it shall remain bound by and subject to the terms of (and shall
have all rights under) the following provisions of this Agreement as a "Member"
hereunder (but shall not be deemed a "member" for purposes of the Act)
notwithstanding the surrender by such Member of all (or any portion of) its
Units in accordance with this Section 4.5: Article I; Section 3.7(b); Section
3.7(c); Section 3.7(e); Section 3.7(f); Section 3.10; Article V; Article VI;
Article IX; Article XI and Article XIII.

                           (e) Notwithstanding anything herein to the contrary,
distributions of Operating Company Shares to an Electing Member pursuant to this
Section 4.5 shall not be deemed a distribution of assets to the Members for
purposes of Section 4.2.

                                       25
<PAGE>

                                   ARTICLE V
                                   MANAGEMENT

                  5.1 THE BOARD. Except as otherwise expressly provided for
herein (including Section 5.14), the Company shall establish a Board of
Representatives (the "Board"), which shall manage and control the business and
affairs of the Company, and shall possess all rights and powers of managers as
provided in the Act and otherwise by law. Except as otherwise expressly provided
for herein (including in Section 5.14), the Members hereby consent to the
exercise by the Board of all such powers and rights conferred on them by the Act
or otherwise by law with respect to the management and control of the Company.
No Member and no Representative, in its capacity as such, shall have any power
to act for, sign for, or do any act that would bind the Company. The Board shall
devote such time and effort to the affairs of the Company as they may deem
appropriate for the oversight of the management and affairs of the Company. Each
Member acknowledges and agrees that no Member shall, in its capacity as a
Member, be bound to devote all or any portion of such Member's business time to
the affairs of the Company, and that each Member and such Member's Affiliates do
and will continue to engage for such Member's own account and for the account of
others in other business ventures. To the fullest extent permitted by applicable
law, each Representative shall have such rights and duties as are applicable to
directors of a Corporation.

                  5.2 ESTABLISHMENT OF BOARD.

                  (a) Number of Representatives. The authorized number of
Representatives constituting the entire Board shall be not more than six.

                  (b) Kenner Representatives. The Kenner Group shall have the
right to designate (and to remove and designate successive replacements for
(with the notice of such removal or replacement to be given to the Company and
each other Person entitled to nominate one or more Representatives to the Board
)) two Representatives (the "Kenner Representatives"). Each Kenner
Representative may, on prior notice to the Board, from time to time designate an
individual (which individual shall be a principal or officer of a Kenner Member)
to serve as a limited replacement representative for purposes of attending any
meeting of the Board (subject to the prior written consent of the ML Group and
the UBS Group as to the designation (but not as to the individual so
designated), which consent shall not be unreasonably withheld), in which event,
such replacement representatives shall be deemed to have a proxy for that Kenner
Representative and shall in all respects be accorded the same power and
authority as if such individual were a Kenner Representative.

                  (c) ML Representative. The ML Group shall have the right to
designate (and to remove and designate successive replacements for (with the
notice of such removal or replacement to be given to the Company and each other
Person entitled to nominate one or more Representatives to the Board )) one
Representative (the "ML Representative"). The ML Representative may, on prior
notice to the Board, from time to time designate an individual (which individual
shall be a principal or officer of an ML Member) to serve as a limited
replacement representative for purposes of attending any meeting of the Board
(subject to the prior written consent of the Kenner Group and the UBS Group as
to the designation (but not as to the individual so designated), which consent
shall not be unreasonably withheld), in which

                                       26

<PAGE>

event, such replacement representative shall be deemed to have a proxy for the
ML Representative and shall in all respects be accorded the same power and
authority as if such individual were the ML Representative.

                  (d) UBS Representative. The UBS Group shall have the right to
designate (and to remove and designate successive replacements for (with the
notice of such removal or replacement to be given to the Company and each other
Person entitled to nominate one or more Representatives to the Board )) one
Representative (the "UBS Representative"). The UBS Representative may, on prior
notice to the Board, from time to time designate an individual (which individual
shall be a principal or officer of a UBS Member) to serve as a limited
replacement representative for purposes of attending any meeting of the Board
(subject to the prior written consent of the Kenner Group and the ML Group as to
the designation (but not as to the individual so designated), which consent
shall not be unreasonably withheld), in which event, such replacement
representative shall be deemed to have a proxy for the UBS Representative and
shall in all respects be accorded the same power and authority as if such
individual were the UBS Representative.

                  (e) Special Kenner Representatives. In addition to the Kenner
Representatives, the Kenner Group shall have the right to designate (and to
remove and designate successive replacements for) two Representatives (the
"Special Kenner Representatives"); provided, however, that the Kenner Group may
not designate, remove, or designate successive replacements for, either Special
Kenner Representative without the prior written consent of the ML Group and the
UBS Group, which consent shall not be unreasonably withheld.

                  (f) Termination of Rights. The rights (but not the
obligations) of each of the Kenner Group, the ML Group and the UBS Group set
forth in this Section 5.2 shall terminate at such time as the Kenner Group, the
ML Group or the UBS Group, as the case may be, ceases to own at least 10% of the
Operating Company Share Equivalents then outstanding.

                  (g) Initial Representatives. The following five individuals
are the Representatives on the date hereof: Jeffrey L. Kenner and Mark L.
Deutsch (the initial Kenner Representatives); Nathan C. Thorne (the initial ML
Representative); Justin S. Maccarone (the initial UBS Representative); and Larry
Solari (the initial Special Kenner Representative). Each Member agrees that the
vacancy on the Board on the date hereof in respect of the second Special Kenner
Representative will be filled (if at all) following the date hereof in a manner
consistent with the provisions of this Section 5.3 (including Section 5.3(e)).

                  5.3 TERM OF OFFICE. Once designated pursuant to Section 5.2, a
Representative shall continue in office until the removal of such Representative
in accordance with the provisions of this Agreement or until the earlier death
or resignation of such Representative. Any Representative may resign at any time
by giving written notice of such Representative's resignation to the Board. Any
such resignation shall take effect at the time the Board receives such notice or
at any later effective time specified in such notice. Unless otherwise specified
in such notice, the acceptance by the Board of such Representative's resignation
shall not be necessary to make such resignation effective. Notwithstanding
anything herein or at law to the contrary, any Representative may be removed and
replaced at any time

                                       27
<PAGE>

with or without cause only by the party or parties entitled to designate and/or
replace such Representative.

                  5.4 MEETING OF THE BOARD.

                  (a) Meetings. The Board may hold meetings either within or
outside the state of Delaware. The Board shall hold regular meetings at least
quarterly, at such time and at such place as the Board may designate. Special
meetings of the Board shall be held promptly upon the request of any
Representative. At least five days (in the case of a regular meeting) or two
days (in the case of a special meeting) prior to any meeting of the Board (or,
in each case, upon such shorter notice as may be approved by all of the
Representatives), the Company shall deliver to each Representative notice, an
agenda and any other relevant materials for such meeting, either personally, by
mail, by telecopier, by telegram or by any other means of communication
reasonably calculated to give notice. Any Representative may waive the
requirement of such notice as to himself.

                  (b) Conduct of Meeting. The Board may meet in person or by
means of conference telephone or similar communications equipment by means of
which all persons participating in the meeting can hear and speak to each other.
Each Representative may participate in any meeting by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear and speak to each other, and such
participation in a meeting shall constitute presence in person at the meeting.

                  (c) Quorum. A majority of the Representatives which have been
designated pursuant to the provisions of this Agreement and who are then in
office shall be necessary to constitute a quorum of the Board for purposes of
conducting business; provided, however, that no quorum shall exist unless either
one of the Kenner Representatives (if one has been designated pursuant to the
provisions of this Agreement), the ML Representative (if one has been designated
pursuant to the provisions of this Agreement) and the UBS Representative (if one
has been designated pursuant to the provisions of this Agreement) are present at
such meeting; provided further, however, that notwithstanding the preceding, the
Board shall not have the power to authorize, facilitate or permit any of the
actions listed in Section 5.14, other than in accordance with the terms of that
Section.

                                       28
<PAGE>

                  5.5 VOTING. Except as otherwise provided in this Agreement,
the effectiveness of any vote, consent or other action of the Board or the
Representatives in respect of any matter shall require either (a) the presence
of a quorum and the affirmative vote of greater than 50% of the votes of the
Representatives present or (b) the unanimous written consent (in lieu of
meeting) of the Representatives who have been designated and who are then in
office. Each Representative shall have one vote with respect to any matter to be
voted on by the Board.

                  5.6 RESPONSIBILITY AND AUTHORITY OF THE BOARD. It shall be the
responsibility of the Board to provide advice to Officers regarding the overall
operation and direction of the Company. The function of the Board shall be
similar to the oversight typically provided to a Corporation by its board of
directors. The Officers shall, at all times, retain responsibility for the
day-to-day management, operation, and control of the Company, subject to the
supervision and direction of the Board.

                  5.7 DEVOTION OF TIME. Other than any Representative who may be
an Officer, the Representatives shall not be obligated and shall not be expected
to devote all or any portion of their time or business efforts to the affairs of
the Company.

                  5.8 BOARD OF DIRECTORS OF OPERATING COMPANY; GOVERNANCE OF
SUBSIDIARIES. The Company shall, in its capacity as a stockholder of the
Operating Company, cause: (i) the composition of the board of directors (or
comparable governing body) of the Operating Company and its Subsidiaries to be
at all times as specified in the Stockholders Agreement; (ii) the Operating
Company and its Subsidiaries to implement fully the governance provisions of
this Agreement; and (iii) the board of directors (or comparable governing body)
of the Operating Company and each of its Subsidiaries to manage or direct the
management of the business and the affairs of such Subsidiary, and to provide to
each Representative and observers designated by the Kenner Group, the ML Group
and the UBS Group (if any) pursuant to the provisions of this Agreement with all
relevant information which reasonably would be considered necessary or advisable
in order to manage or direct the business and affairs of the Operating Company
or such Subsidiary.

                  5.9 COMMITTEES.

                           (a) The Board may designate from among the
Representatives one or more committees ("Committees") to serve at the pleasure
of the Board; provided, however, that the Board may not delegate the overall
functioning of the Board to any Committee. Except as required by applicable
securities laws or listing requirements, no Committee shall have the right to
exercise any power or authority of the Board, and all recommendations of a
Committee shall require approval of the Board prior to becoming effective.

                           (b) Each of the ML Group and the UBS Group shall, for
so long as it has the right to designate a Representative, be entitled to
designate (remove and replace) a member of the compensation committee and the
audit committee of the Board and the board of directors (or comparable governing
body) of each other Atrium Group Company, to the extent permitted by applicable
law or listing requirements. If at any time the ML Group or the UBS Group, as
the case may be, does not have a designee on the compensation committee or the
audit committee of the Board or the board of directors (or comparable governing
body) of any other

                                       29
<PAGE>

Atrium Group Company then, during such time, it shall have the right to
designate an observer of any such committee or comparable body, which observer
shall have such rights with respect to such committee or comparable body as an
observer designated pursuant to Section 5.10 has with respect to the Board.

                  5.10 OBSERVERS AT BOARD MEETINGS. Each of the Kenner Group,
the ML Group and the UBS Group shall, for so long as it has the right to
designate a Representative, be entitled to designate an observer who shall be
permitted (but not required) to attend and participate in meetings of the Board
and the board of directors (or comparable governing body) of each other Atrium
Group Company and any meetings of any committees (including audit committees) of
any thereof and shall be entitled to receive all notices, reports and other
material sent to the Representatives (including committee members) of the
Company or the members of the board of directors (or comparable governing body)
of each other Atrium Group Company. Except to the extent such observer is
designated as a replacement for a Representative in accordance with Section 5.2,
for purposes of attending any meeting of the Board, such observer shall not be
permitted to vote on any matter and shall not participate in any action of the
Board or the board of directors (or comparable governing body) of such other
Atrium Group Company or any such committees. The Company shall reimburse any
observer of the Kenner Group, the ML Group and the UBS Group for all reasonable
out-of-pocket expenses incurred by such observer in connection with attendance
at meetings of the Board or the board of directors (or comparable governing
body) of any other Atrium Group Company.

                  5.11 PAYMENTS TO REPRESENTATIVES, REIMBURSEMENTS. No
Representative shall be entitled to remuneration by the Company for services
rendered in its capacity as a Representative (other than for reimbursement of
those expenses described in the next succeeding sentence). All Representatives
will be entitled to reimbursement of their reasonable out-of-pocket expenses
incurred in connection with their attendance at meetings of the Board.

                  5.12 REPRESENTATIVE INFORMATION. The Company shall cause the
Operating Company to furnish to each Representative and each member of the board
of directors of the Operating Company (and to the observers of the Kenner Group,
the ML Group and the UBS Group, if any) copies of all notices, documents,
certificates and other instruments required to be delivered by the applicable
Atrium Group Companies to the Administrative Agent (as defined in the Credit
Agreement) under Sections 9.01 and 9.02 of the Credit Agreement, in each case
concurrently with the delivery thereof to the Administrative Agent.

                  5.13 OFFICERS.

                           (a) Designation and Appointment. The Company shall
have the following Officers: a "president and chief executive officer" and "a
"secretary". Each such Officer shall have such authority and perform such duties
as the Board may, from time to time, delegate to it. Each Officer shall hold
office until his successor shall be duly designated and shall qualify or until
his death or until he shall resign or shall have been removed in the manner
hereinafter provided. The salaries or other compensation, if any, of the
Officers of the Company shall be fixed from time to time by the Board. The
initial president and chief executive officer of the Company shall be Jeffrey
Kenner. The secretary of the Company shall be Mark Deutsch.

                                       30
<PAGE>

                           (b) Resignation/Removal. Any Officer may resign as
such at any time. Such resignation shall be made in writing and shall take
effect at the time specified therein, or if no time be specified, at the time of
its receipt by the Company. The acceptance of a resignation shall not be
necessary to make it effective, unless expressly so provided in the resignation.
Any Officer may be removed as such, either with or without cause at any time by
the Board. Designation of an Officer pursuant to Section 5.13(a) shall not of
itself vest in such Person any contractual or employment rights with respect to
the Company.

                           (c) This Section 5.13 is subject to Section 5.14.

                  5.14 NEGATIVE COVENANTS.

                           (a) Unanimous Approval. Notwithstanding anything to
the contrary herein (but subject to Sections 4.5, 9.4, 9.5, 9.6, 9.7 and 9.8),
the Company shall not (and the Company shall cause each other Atrium Group
Company not to) take, authorize, facilitate or permit to occur any of the
following without the prior written approval of each of the Kenner Group, the ML
Group and the UBS Group, in each case for so long as the Kenner Group, the ML
Group or the UBS Group, as the case may be, owns at least 10% of the Operating
Company Share Equivalents then outstanding:

                           (i) any amendment, supplement or waiver of any
         provision of the organizational documents of any Atrium Group Company
         (including (i) the Certificate of the Company and the certificates of
         incorporation (including any certificate of designation, preferences or
         rights with respect to a class or series of preferred stock of the
         Operating Company or any of its Subsidiaries) and by-laws (or
         comparable organizational documents) of any Atrium Group Company, this
         Agreement, the Stockholders Agreement or any shareholders agreement (or
         comparable agreement) of any Atrium Group Company, and (ii) the filing
         of any certificate of designation, preferences or rights with respect a
         class or series of preferred stock of the Operating Company or any of
         its Subsidiaries or any similar document affecting its charter), other
         than to the extent necessary for actions or inactions that would
         expressly be permissible under this Agreement but for this Section
         5.14(a)(i);

                           (ii) (A) any admission by any Atrium Group Company of
         its inability to pay its debts as they become due, or the suspension of
         payment on any of its debts (other than where it is disputing such
         payment in good faith), or the announcement of its intention to do so;
         (B) any step by any Atrium Group Company with a view to a composition,
         moratorium, assignment or similar arrangement with any of its
         creditors; (C) the liquidation, dissolution, termination of status as a
         legal entity, winding up, reorganization, adjustment, relief,
         administration (whether out of court or otherwise) of any Atrium Group
         Company, or the commencement of any proceedings (in bankruptcy or
         otherwise) in respect of any of the foregoing; (D) the consent by any
         Atrium Group Company to the entry of an order for relief in an
         involuntary case under bankruptcy law or other similar proceeding under
         applicable law; (E) any request by any Representative, director,
         officer or other representative of any Atrium Group Company for the
         appointment of, the giving of any notice of his or her intention to
         appoint, or the application for or consent to the appointment of a
         receiver, liquidator, assignee,

                                       31
<PAGE>

         custodian or trustee (or similar official) of any Atrium Group Company
         or any material part of its assets; (F) any assistance by any Atrium
         Group Company in the presentation of, or any failure by any Atrium
         Group Company to oppose in a timely manner, a petition for, or any
         voluntary action by any Atrium Group Company in furtherance of, any of
         the events, actions or matters of the type described in clauses (A)
         through (E) above;

                           (iii) any modification of the nature of the Business
         or the entry by any Atrium Group Company into a new line of business
         that is not part of the Business;

                           (iv) the entry into, or any amendment to, waiver,
         renewal or extension, of any contract, arrangement or other transaction
         between any Atrium Group Company, on the one hand, and any Related
         Party, on the other, except for: (1) the execution and delivery on the
         date hereof (but not the amendment of, waiver under, renewal or
         extension of) of the agreements listed on Schedule 5.14(a)(iv), (2) any
         transaction permitted by Section 5.14(a)(v), (3) any transaction
         permitted by Section 5.14(b)(ix) (other than with respect to any Key
         Executive or proposed Key Executive who is employed or engaged by, or a
         partner in or of, any Member or its Affiliates); (4) any dividend or
         other distribution effected in accordance with Section 5.14(b)(viii);
         (5) any authorization or issuance of securities of the Company
         permitted by Section 5.14(b)(i) after compliance with Section 3.5 of
         this Agreement; (6) the payment of reasonable fees and compensation to,
         and customary indemnity and reimbursement provided on behalf of,
         officers and directors of any Atrium Group Company in the ordinary
         course of business consistent with past practice and in compliance with
         this Agreement, the Stockholders Agreement and the certificate of
         incorporation and by-laws of the Operating Company; and (7) except with
         respect to investment banking services, the entering into any contract,
         arrangement or other transaction with any Affiliate of ML IBK
         Positions, Inc., Merrill Lynch Ventures L.P. 2001, UBS Capital Americas
         II, LLC or any of their Permitted Transferees that is not a Subsidiary
         of such Person that is on terms and conditions that are not less
         favorable to the applicable Atrium Group Company than otherwise would
         be available on an arm's length basis;

                           (v) the direct or indirect redemption, repurchase,
         retirement or other acquisition of any capital stock, equity-linked,
         derivative or other equity securities of any Atrium Group Company
         (other than securities of a wholly owned Subsidiary), or the amendment
         of the terms of such securities; provided, however, that the foregoing
         restrictions shall not apply to (A) the redemption or repurchase of
         securities of the Company or any other Atrium Group Company pursuant to
         the option plans of the Operating Company, the employment agreements
         (or other employment arrangements) of Key Executives, restricted stock
         purchase agreements or management buy-sell agreements, in each case in
         effect on the date hereof and true, complete and correct copies of
         which have previously been provided to the ML Group and the UBS Group
         or which subsequently have been approved in accordance with the terms
         of this Agreement, or (B) any dividend permitted pursuant to Section
         5.14(b)(vii) that is paid in the form of a redemption.

                                       32
<PAGE>

                           (vi) (A) the designation, hiring, removal or
         replacement of the chief executive officer of the Company or the
         Operating Company (or any officer with comparable duties), (B) the
         entry into an employment agreement with the chief executive officer of
         the Company or the Operating Company (or any officer with comparable
         duties), or any amendment to, waiver, renewal or extension of, any
         material term of such employment agreement (it being understood and
         agreed that any provision thereof relating to the compensation of the
         chief executive officer (or such other officer with comparable duties)
         shall be deemed material, or (C) the exercise of any right (but not the
         compliance with any obligation under) or the granting of any waiver
         under, any employment arrangement with the chief executive officer of
         the Operating Company (or any officer with comparable duties) entered
         into in compliance with this Agreement;

                           (vii) the compromise or settlement of any legal
         action or any arbitration proceeding to which any Atrium Group Company
         is a party in which the settlement or compromise includes injunctive or
         other non-monetary relief against any Atrium Group Company (other than,
         subject to Section 5.14(b)(viii), by way of payment of monetary
         damages);

                           (viii) (A) the direct or indirect sale, assignment,
         license, transfer or other disposition by the Atrium Group Companies in
         a single transaction or series of related transactions (X) constituting
         all or substantially all the assets of the Atrium Group Companies on a
         consolidated basis (whether by way of sale of equity securities or
         assets), or (Y) any shares of capital stock or other equity interests
         (including Operating Company Shares) issued by the Operating Company or
         any Subsidiary of the Operating Company, other than, only in the case
         of shares of capital stock or other equity interests issued by a
         Subsidiary of the Operating Company, to the extent necessary to effect
         a Transfer consented to in accordance with (or permitted by) Section
         5.14(b)(xii) (it being understood and agreed that this clause (Y) does
         not apply to primary issuances of equity securities by an Atrium Group
         Company), or (B) any merger, consolidation, business combination or
         reorganization involving any Atrium Group Company, other than those
         only involving wholly owned Subsidiaries of the Operating Company or to
         the extent necessary to effect a transaction contemplated by Section
         5.14(b)(vi) the result of which is that the acquired Person becomes a
         wholly owned Subsidiary of the Operating Company;

                           (ix) the authorization or issuance, or the entry into
         of any agreement or the issuance of any instrument providing for, the
         authorization or issuance (contingent or otherwise) of, any shares of
         capital stock, equity-linked, derivative or other equity securities or
         other Convertible Securities of any Atrium Group Company (in each case
         other than to KAT Holdings, L.P., KAT Group, L.P., ML IBK Positions,
         Inc., Merrill Lynch Ventures L.P. 2001, UBS Capital Americas II, LLC or
         any of their respective Permitted Transferees), to the extent it would
         cause a Change of Control of the Company or the Operating Company
         (solely for purposes of this Section 5.14(a)(ix), all references to 50%
         in the definition of "Change of Control" in Section 1.1 shall be deemed
         references to 25%);

                                       33
<PAGE>

                           (x) the creation of any Subsidiary of the Company or
         of the Operating Company, unless: (1) all of the equity interests of
         such Subsidiary are owned by the Operating Company, or by another
         Subsidiary of the Operating Company in which all the equity interests
         of such other Subsidiary are owned directly or indirectly by the
         Operating Company; and (2) the by-laws or similar governing documents
         of each such Subsidiary contain provisions regarding the size,
         composition, quorum requirements and voting of the board of directors
         and other governance provisions equivalent to those provided for herein
         with respect to the Company, in each case other than to the extent
         necessary to effect an acquisition consented to in accordance with (or
         permitted by) Section 5.14(b)(v) or Section 5.14(b)(vi); or

                           (xi) the taking of any action directly or indirectly
         in contemplation of the foregoing.

                           (b) Supermajority Approval. Notwithstanding anything
to the contrary herein (but subject to Sections 4.5, 9.4, 9.5, 9.6, 9.7, and
9.8), the Company shall not (and the Company shall cause each other Atrium
Company not to) take, authorize, facilitate or permit to occur any of the
following actions without the prior approval of (x) the Kenner Group, and (y)
either the ML Group or the UBS Group (except that if any of the Kenner Group,
the ML Group or the UBS Group owns less than 10% of the Operating Company Share
Equivalents then outstanding, only the approval of the other two groups shall be
required), which approval may only be given in accordance with Section 3.7(b):

                           (i) the authorization or issuance, or the entry into
         any agreement (or into any amendment to such agreement) or the issuance
         of any instrument providing for, the authorization or issuance
         (contingent or otherwise) of, any shares of capital stock,
         equity-linked, derivative or other equity securities or other
         Convertible Securities of any Atrium Group Company (including the
         adoption of any stock option plan or other stock incentive plan or
         arrangement or the amendment of or supplement to any stock option
         plan), in each case to the extent not covered by Section 5.14(a)(ix);
         provided, however, that the foregoing restrictions shall not apply to:
         (A) the issuance of 7,750 Operating Company Shares issuable upon
         exercise of the warrant issued by the Operating Company to Jeff L.
         Hull, dated December 10, 2003, (B) the issuance of 8,750 Operating
         Company Shares issuable to Key Executives of the Operating Company
         pursuant to the exercise of stock options to be issued on or after date
         hereof having an exercise price per share equal to $1000, (C) the
         authorization of an option pool covering 5,250 Operating Company Shares
         issuable to Key Executives of the Operating Company pursuant to the
         exercise of stock options to be issued on or after date hereof (which
         stock option issuances shall be subject to the restrictions set forth
         in this Section 5.14(b)(i)) having an exercise price per share greater
         than $1,000; and (D) the formation of or issuance of any such
         securities of any wholly owned Subsidiary of the Operating Company to
         the Operating Company or any other wholly owned Subsidiary of the
         Operating Company;

                           (ii) (A) the approval of any Annual Budget, (B) any
         material amendment to an Approved Annual Budget, or (C) except to the
         extent necessary to effect an acquisition consented to in accordance
         with (or permitted by) Section

                                       34
<PAGE>

         5.14(b)(v) or Section 5.14(b)(vi), the authorization in any one Fiscal
         Year (but not on a monthly basis) of any capital or operating
         expenditure or series of capital or operating expenditures by the
         Company or any other Atrium Group Company exceeding $1,000,000 in the
         aggregate, unless expressly provided for in the Approved Annual Budget;

                           (iii) the appointment, or renewal of appointment of,
         or removal of the independent auditors of any Atrium Group Company
         (which in any event shall be at all times a Big Four Firm);

                           (iv) the making of any changes to or departures from
         the accounting policies, practices or principles of any Atrium Group
         Company, other than as required by GAAP, applicable law or listing
         requirements;

                           (v) the making by the Atrium Group Companies of any
         Investment;

                           (vi) the acquisition of (A) tangible or intangible
         assets (including the acquisition of an existing business from another
         Person, or (B) a Controlling interest in another Person that is not a
         wholly owned Subsidiary of an Atrium Group Company (whether in the form
         of equity securities, equity-linked securities, derivative securities
         or convertible securities (including any interests in any partnership
         or joint venture)), by one or more Atrium Group Companies, including
         any capital expenditure not included in the Approved Budget, for an
         acquisition price in respect of any single acquisition or series of
         related acquisitions in excess of $10,000,000 or an acquisition price
         in the aggregate for all such acquisitions in excess of $40,000,000 in
         any "rolling" three-year period commencing on the date hereof (taking
         into account for purposes of valuing any such acquisition or series of
         related acquisitions the amount of debt, if any, assumed by the
         applicable Atrium Group Company and the maximum amount of deferred or
         contingent consideration, if any, to be paid by it in connection with
         such acquisition); provided, however, that this Section 5.14(b)(vi)
         shall not apply to the acquisition of inventory in the ordinary course
         of business consistent with past practice;

                           (vii) except as expressly permitted by Section 4.2,
         the declaration or making of any dividend on or with respect to any
         limited liability company interest or capital stock or other equity
         interest, as the case may be, of any Atrium Group Company or any other
         distribution to the Members or the stockholders of any Atrium Group
         Company of any assets or property of such Atrium Group Company, in each
         case other to the Operating Company or any of its wholly owned
         Subsidiaries;

                           (viii) (A) the commencement of any legal action or
         any arbitration proceeding involving amounts in excess of $500,000
         individually or otherwise material to any Atrium Group Company, or (B)
         the compromise or settlement of any legal action or any arbitration
         proceeding involving amounts in excess of $100,000 individually or
         otherwise material to any Atrium Group Company;

                           (ix) (A) the designation, hiring, removal or
         replacement of any Key Executive, (B) the entry into an employment
         agreement with any Key Executive, or any

                                       35
<PAGE>

         amendment to, waiver, renewal or extension of, any material term of the
         employment agreement of such Key Executive (it being understood and
         agreed that any provision thereof relating to the compensation of such
         Key Executive shall be deemed material) or (C) the exercise of any
         right (but not the compliance with any obligation under) or the
         granting of any waiver under, any employment arrangement with any Key
         Executive entered into in compliance with this Agreement;

                           (x) (A) except pursuant to the Registration Rights
         Agreement, the registration of any of its securities under any
         applicable securities law or the consummation of any public offering of
         any of its securities; or (B) the adoption or implementation of any
         strategy (including decisions as to timing and pricing and the
         selection of a United States or foreign stock exchange or market) for
         purposes of the consummation of an underwritten public offering of its
         securities resulting in the admission or listing of its securities
         thereon (including a Qualified Public Offering);

                           (xi) (A) (x) the amendment of, supplement to or
         waiver of any instrument evidencing, securing or otherwise relating to
         Indebtedness of the Operating Company or any of its Subsidiaries in
         excess of $1,000,000, or (y) the amendment of, supplement to or waiver
         of any instrument evidencing, securing or otherwise relating to
         Indebtedness of the Operating Company or any of its Subsidiaries lesser
         than $1,000,000 to the extent it would cause the Indebtedness of the
         Operating Company and its Subsidiaries on a consolidated basis to
         exceed $20,000,000; (B) (x) any incurrence after the date hereof by the
         Operating Company or any of its Subsidiaries of Indebtedness (including
         the drawing down on the existing credit facilities of the Operating
         Company or any of its Subsidiaries) exceeding at any time $20,000,000
         on a consolidated basis, or (y) the amendment of, supplement to or
         waiver of any instrument evidencing, securing or otherwise relating to
         such Indebtedness; (C) the extension or refinancing of any Indebtedness
         of the Operating Company or any of its Subsidiaries, except in each
         case Indebtedness of the Operating Company or any of its wholly owned
         Subsidiaries owing to the Operating Company or such wholly owned
         Subsidiary, as the case may be;

                           (xii) other than to the extent covered by Section
         5.14(a)(viii), the direct or indirect sale, assignment, license,
         transfer or other disposition by the Atrium Group Companies of assets
         having a fair market value (taking into account, for purposes of
         valuing any such transaction the amount of debt, if any, assumed by the
         transferee and the maximum amount of deferred or contingent
         consideration, if any, to be received by the applicable seller),
         exceeding $10,000,000 in respect of a single transaction or a series of
         related transactions or $20,000,000 in the aggregate from the date of
         this Agreement, except for sales and dispositions of products and
         inventories in the ordinary course of business consistent with past
         practice; or

                           (xiii) the taking of any action directly or
         indirectly in contemplation of the foregoing.

                           (c) Approval of ML Group and UBS Group.
Notwithstanding anything to the contrary herein, the Company shall not (and the
Company shall cause each other

                                       36
<PAGE>

Atrium Company not to) take, authorize, facilitate or permit to occur any of the
following actions without the prior written approval of the ML Group and the UBS
Group (except that if either of the ML Group or the UBS Group owns less than 10%
of the Operating Company Share Equivalents then outstanding, only the approval
of the other group shall be required):

                           (i) the exercise of any right (but not the compliance
                  with any obligation under) or the granting of any waiver
                  under, any employment arrangement with the chief executive
                  officer of the Company (or any officer with comparable duties)
                  entered into in compliance with this Agreement; or

                           (ii) the taking of any action directly or indirectly
                  in contemplation of the foregoing.

                           (d) Notwithstanding anything herein to the contrary,
the approval rights of the Kenner Group, the ML Group and the UBS Group
(including in Section 5.14(a)(ix) and Section 5.14(b)(i)) shall not limit or
otherwise affect the preemptive rights of any Member set forth in Section 3.5 or
in the Stockholders Agreement.

                           (e) No Member shall, nor shall any Member permit its
Affiliates to, take any action that would have the effect of circumventing the
protective provisions of this Section 5.14. Except as permitted hereby, the
Company shall not permit any other Atrium Group Company to undertake actions
that, if undertaken by the Company, would require the prior written consent of
the Kenner Group, the ML Group and/or the UBS Group, as the case may be,
pursuant to this Section 5.14, without having obtained such prior written
consent.

                  5.15 AFFIRMATIVE COVENANTS.

                           (a) The Company shall (or shall cause the Operating
Company to) deliver to each Person comprising part of the Kenner Group, the ML
Group or the UBS Group, as the case may be, holding at least 10% of the
Operating Company Share Equivalents then held by the Kenner Group, the ML Group
or the UBS Group, as the case may be, the following: (i) within thirty (30) days
from the taking by the Board or the board of directors (including any committee
of either thereof), as the case may be, or the Members or the stockholders, as
the case may be, of the Company, the Operating Company and Atrium Companies,
Inc. of any action, a copy of any minutes or written consent of such action;
(ii) promptly, general communications from the Company, the Operating Company or
Atrium Companies, Inc. to its Members or stockholders, as the case may be or to
its Representatives or directors, as the case may be, or the public at large;
(iii) promptly, reports of the Operating Company filed with the SEC; (iv)
promptly, notice of any Material Adverse Effect; (v) as soon as they shall
become available, but no later than 25 days after the end of the applicable
month, monthly operational reports (including a consolidated income statement
for such month and a consolidated statement of cash flow for such month and a
balance sheet as of the end of such month) prepared in accordance with GAAP
(except for the absence of footnotes and year-end adjustments) and containing a
summary comparison to the applicable Approved Annual Budget; (vi) promptly,
notice of any material developments in respect of the Approved Annual Budget
then in effect; (vii) promptly, from time to time, any other information
regarding the business, prospects, financial condition, operations, property or
affairs of the Company, the Operating Company or Atrium Companies,

                                       37
<PAGE>

Inc. as such Kenner Member, ML Member or UBS Member may reasonably request
(notwithstanding anything to the contrary contained in Section 18-305 of the Act
or this Agreement); and (viii) promptly, from time to time, any information
(including any information of the nature set forth above regarding the business,
prospects, financial condition, operations, property or affairs of any Atrium
Group Company (other than the Company, the Operating Company or Atrium
Companies, Inc.) as such Kenner Member, ML Member or UBS Member may reasonably
request (notwithstanding anything to the contrary contained in Section 18-305 of
the Act or this Agreement).

                           (b) Annual Budget. The Company shall (or shall cause
the Operating Company to) present the proposed Annual Budget for each Fiscal
Year subsequent to 2003 to the Kenner Group, the ML Group and the UBS Group no
later than thirty (30) days before the commencement of such Fiscal Year;
provided, however, that the Company shall (or shall cause the Operating Company
to) present the proposed Annual Budget for Fiscal Year 2004 to the Kenner Group,
the ML Group and the UBS Group on or before December 31, 2003.

                           (c) Inspection Rights. Notwithstanding anything to
the contrary contained in Section 18-305 of the Act or this Agreement, the
Company shall permit any representative designated by any of the Kenner Group,
the ML Group and the UBS Group, at such group's expense, to visit and inspect
during regular business hours any of the properties of any Atrium Group Company,
including its and their books of account (and to make copies thereof and to take
extracts therefrom), and to discuss its and their affairs, finances and accounts
with its and their officers or employees, all at such reasonable times and as
often as may be reasonably requested, and with representatives of the Company's
lenders; provided, however, that such rights shall be exercised in a manner so
as not to materially and adversely disrupt the ordinary course of business of
the applicable Atrium Group Company.

                           (d) Disclosure and Cooperation with Respect to
Transfers. Upon the request of any Member, the Company shall: (i) promptly
supply to such Member or its prospective Transferees of Units permitted
hereunder, all information regarding the Company reasonably required to be
delivered in connection with a Transfer or proposed Transfer of Units, provided
that such transferee enters into a reasonable and customary confidentiality
agreement with respect to such information; and (ii) otherwise cooperate and
take all other actions as reasonably requested by such Member in connection with
any Transfers permitted pursuant to the terms of Article IX.

                                       38

<PAGE>

                  5.16 NO AGREEMENTS, ETC. Except as set forth in this Agreement
or on Schedule 5.16, there are no agreements, contracts, commitments or other
arrangements (whether written or oral) between or among any Atrium Group
Company, any Member and/or any Affiliate of a Member with respect to the subject
matter of this Agreement or the transactions contemplated by the Merger
Agreement. Except for this Agreement or as expressly contemplated hereby, the
Members will not, directly or indirectly, enter into any agreements, contracts,
commitments or other arrangements (whether written or oral) (including by way of
an amendment of, or modification to, any of the agreements, contracts,
commitments or other arrangements set forth on Schedule 5.16) between or among
themselves with respect to the subject matter hereof or otherwise related to the
Atrium Group Companies.

                  5.17 EFFECT OF ANNUAL BUDGET. The parties agree that the
business and operations of the Atrium Group Companies will be conducted over the
course of the relevant fiscal year in accordance with the applicable Approved
Annual Budget and in compliance with Section 5.14.

                  5.18 INITIAL CHIEF EXECUTIVE OFFICER; CHAIRMAN OF OPERATING
COMPANY BOARD. Each Member and the Company shall cause the board of directors of
the Operating Company to appoint Jeff Hull as the initial chief executive
officer of the Operating Company and the initial Chairman of the board of
directors of the Operating Company.

                  5.19 COMPLIANCE WITH AGREEMENTS. Each Member will cause the
Company to comply with this Agreement and to cause the Operating Company to
comply with the Stockholders Agreement and, to the extent required, this
Agreement.

                  5.20 NO INDEBTEDNESS. The Company shall not incur any
Indebtedness without the unanimous prior written consent of the Kenner Group,
the ML Group and the UBS Group.

                  5.21 CERTAIN COMPANY ACTIONS. The Company and the Kenner Group
hereby agree (and shall cause the Operating Company and its Subsidiaries to
agree) that all actions to be taken by the Company under or pursuant to the
Management Agreement shall only be taken by the ML Group and the UBS Group
acting together. In addition, the Company and the Kenner Group shall (and shall
cause the Operating Company and its Subsidiaries to) promptly deliver to the ML
Group and the UBS Group copies of any notice received by any of them in respect
of the Management Agreement.

                                   ARTICLE VI
              LIABILITY, EXCULPATION, INDEMNIFICATION AND INSURANCE

                  6.1 LIABILITY. To the fullest extent permitted by law, the
debts, obligations and liabilities of the Company, whether arising in contract,
tort or otherwise, shall be solely the debts, obligations and liabilities of the
Company, and no Covered Person shall be obligated personally for any such debt,
obligation or liability of the Company solely by reason of being a Covered
Person.

                  6.2 DUTIES AND LIABILITIES OF COVERED PERSONS. No Covered
Person shall be liable to the Company or to any Member for any loss or liability
arising out of any act or

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<PAGE>

omission in connection with the Company taken or omitted by such Covered Person
in good faith reliance on the provisions of this Agreement.

                  6.3 EXCULPATION.

                           (a) To the fullest extent permitted by applicable
law, and except as otherwise expressly provided herein, no Covered Person shall
be liable to the Company or any Member for any loss or liability arising out of
any act or omission of such Covered Person in connection with the Company to the
extent that such act or omission was taken or omitted in good faith and in a
manner the Covered Person reasonably believed to be in or not opposed to the
best interests of the Company and, with respect to any criminal act, the Covered
Person had no reasonable cause to believe such Person's conduct was unlawful.

                           (b) A Covered Person shall be fully protected in
relying in good faith upon the records of the Company and upon such information,
opinions, reports or statements presented to the Company by any Person as to
matters the Covered Person believes are within such other Person's professional
or expert competence and who has been selected with reasonable care by or on
behalf of the Company, including information, opinions, reports or statements as
to the value and amount of assets, liabilities, profits or losses or any other
facts pertinent to the existence and amount of assets from which distributions
to Members might properly be paid.

                  6.4 INDEMNIFICATION. To the fullest extent permitted by
applicable law, the Company shall, and shall cause each other Atrium Group
Company to, indemnify and hold harmless each of the Covered Persons from and
against any and all liabilities, obligations, losses, damages, expenses
(including legal and accounting fees and expenses, costs of investigation and
sums paid in settlement), taxes and interest and penalties thereon (other than
taxes based on fees or other compensation received by such Covered Person from
the Company), judgments, fines, settlements and other amounts (collectively,
"Indemnified Costs") arising from all claims, demands, actions, suits,
proceedings (whether civil, criminal, administrative, investigative or
otherwise) (collectively, "Indemnified Actions"), in which the Covered Person
may be involved, or threatened to be involved, as a party or otherwise arising
of its status as (a) a Member of the Company, (b) a Representative, (c) an
Affiliate of a Representative, Member or the Company, or (d) director, manager,
officer, shareholder, member, partner or employee of any of the foregoing
Persons or of the Operating Company or any of its Subsidiaries, regardless of
whether the covered Person continues in such capacity at the time any such
liability is paid or incurred, and regardless of whether any such Indemnified
Action is brought by a third party, a Member, or by or in the right of any
Atrium Group Company; provided, however, that a Covered Person shall not be
entitled to indemnification hereunder against Indemnified Costs that are
primarily attributable to (i) the failure of such Covered Person to act in good
faith and in a manner the Covered Person reasonably believed to be in or not
opposed to the best interests of the Company, (ii) any fraudulent act or conduct
by such Covered Person, or (iii) in the case of a Member, such Member's knowing
breach or violation of this Agreement.

                  6.5 ADVANCEMENT OF EXPENSES. To the fullest extent permitted
by applicable law and consistent with Section 6.4, the Company shall pay the
Indemnified Costs incurred by a Covered Person in defending any Indemnified
Action as such Indemnified Costs are incurred by

                                       40
<PAGE>

such Covered Person and in advance of the final disposition of such matter,
provided that such Covered Person undertakes in writing to repay such expenses
if it is determined by agreement between such Covered Person and the Company or,
in the absence of such an agreement, by a final judgment of a court of competent
jurisdiction that such Covered Person is not entitled to be indemnified pursuant
to Section 6.4. Any claim for advancement of expenses shall set forth in
reasonable detail the basis for the claim.

                  6.6 NOTICE OF PROCEEDINGS. Promptly after receipt by a Covered
Person of notice of the commencement of any proceeding against such Covered
Person, such Covered Person shall, if a claim for indemnification in respect
thereof is to be made against the Company, give written notice to the Board of
the commencement of such proceeding; provided, however, that the failure of a
Covered Person to give notice as provided herein shall not relieve the Company
of its obligations under Sections 6.4 and 6.5, except to the extent that the
Company is prejudiced by such failure to give notice. In case any such
proceeding is brought against a Covered Person (other than a proceeding by or in
the right of the Company), after the Company has acknowledged in writing its
obligation to indemnify and hold harmless the Covered Person, the Company will
be entitled to assume the defense of such proceeding; provided, however that (i)
the Covered Person shall be entitled to participate in such proceeding and to
retain its own counsel at its own expense and (ii) if the Covered Person shall
give notice to the Company that in its good faith judgment certain claims made
against it in such proceeding could have a material adverse effect on the
Covered Person or its Affiliates other than as a result of monetary damages, the
Covered Person shall have the right to control (at its own expense and with
counsel reasonably satisfactory to the Company) the defense of such specific
claims with respect to the Covered Person (but not with respect to the Company
or any other Member); provided further, however, that if a Covered Person elects
to control the defense of a specific claim with respect to such Covered Person,
such Covered Person shall not consent to the entry of a judgment or enter into a
settlement that would require the Company to pay any amounts under Section 6.4
without the prior written consent of the Company, such consent not to be
unreasonably withheld. After notice from the Company to such Covered Person
acknowledging the Company's obligation to indemnify and hold harmless the
Covered Person and electing to assume the defense of such proceeding, the
Company will not be liable for expenses subsequently incurred by such Covered
Person in connection with the defense thereof. Without the consent of such
Covered Person, the Company will not consent to the entry of any judgment or
enter into any settlement; provided, however, that the consent of such Covered
Person shall not be unreasonably withheld if such judgment or settlement
includes as an unconditional term thereof the giving by the claimant or
plaintiff to such Covered Person of a release from all liability arising out of
the proceeding and claims asserted therein. Any decision that is required to be
made by the Company pursuant to Section 6.4 or Section 6.5 or this Section 6.6
shall be made on behalf of the Company by the affirmative vote of a majority of
the Representatives who do not have a financial or other interest in the outcome
of the decision, even though such Representatives are less than a quorum or, if
there are no such Representatives, by those Members then holding a majority of
the outstanding Units.

                  6.7 INSURANCE. The Company will cause the Operating Company to
purchase and maintain insurance, to the extent, in such amounts and on behalf of
such Covered Persons and such other Persons as the Kenner Group, the ML Group
and the UBS Group shall, in their discretion, determine to be acceptable,
against any liability that may be asserted against or

                                       41

<PAGE>

expenses that may be incurred by any such Person in connection with the
activities of the Company or such indemnities, regardless of whether the Company
would have the power to indemnify such Person against such liability under the
provisions of this Agreement or by law.

                  6.8 OUTSIDE BUSINESSES.

                           (a) Except as provided in Section 6.8(b), any Member,
any Representative and any of their respective Affiliates may engage in or
possess an interest in other investments, business ventures or entities of any
nature or description, independently or with others, similar or dissimilar to,
or that compete with, the Business or the investments of the Company, and may
provide advice and other assistance to any such investment, business venture or
entity, and the Company and the Members shall have no rights by virtue of this
Agreement in and to such investments, business ventures or entities or the
income or profits derived therefrom, and the pursuit of any such investment or
venture, even if competitive with the Business, shall not be deemed wrongful or
improper. Nothing in this Section 6.8(a) shall be in limitation of any other
agreement to which such Member, Representative or Affiliate is a party or of any
duty by which it is otherwise bound.

                           (b) KAT Holdings, L.P. and its Permitted Transferees,
for themselves and on behalf of Kenner and Company covenant not to, and to cause
any Person or Persons Controlling or under common Control of any of them
(collectively, the "Restricted Persons") not to, directly or indirectly,
anywhere in the United States or the world:

                           (i) engage in any business competing with (i) the
                  business of manufacturing and distributing residential windows
                  and patio doors in the United States, or (ii) any other
                  significant business hereafter entered into by an Atrium Group
                  Company (a "New Business"); provided, however, if at the time
                  the applicable Atrium Group Company first engages in a New
                  Business, the Restricted Persons already are engaged in such
                  New Business, then the restrictions set forth in this Section
                  6.8(b)(i) shall not apply to the Restricted Persons'
                  activities in respect of such New Business as conducted as of
                  such date; or

                           (ii) participate as an agent, manager, officer,
                  director, employee or consultant of any third party that
                  competes with any product, process, good or service which is
                  the same as, is functionally similar to, or competes with any
                  product, process, good or service that is under active
                  consideration at the direction or specific authority of the
                  Board for development or is otherwise made, distributed or
                  commercialized by an Atrium Group Company (a "Competitor"); or

                           (iii) acquire or hold any financial interest (whether
                  as a principal, partner, member, stockholder or otherwise) in
                  or with any Competitor; provided, however, that ownership of a
                  passive investment of less than 5% of the outstanding capital
                  stock of a Competitor if such capital stock is a security
                  which is actively traded on an established national securities
                  exchange or is listed on the NASDAQ National Market (or any
                  successor exchange, market or organization thereto) shall not
                  constitute a violation of this Section 6.8(b).

                                       42
<PAGE>

                           (c) Section 6.8(b) shall terminate and be of no
further force and effect from and after the time that neither Kenner and Company
nor any of its Affiliates shall own, directly or indirectly, any interest in the
Operating Company.

                  6.9 INDEMNIFICATION AND REIMBURSEMENT FOR PAYMENTS ON BEHALF
OF A MEMBER.

                           (a) If the Company is obligated to pay any amount to
a governmental agency (or otherwise makes a payment) because of a Member's
status or otherwise specifically attributable to a Member (including, without
limitation, federal withholding taxes with respect to foreign Persons, state
personal property taxes, state unincorporated business taxes, etc.), then such
Member (the "Indemnifying Member") shall indemnify the Company in full for the
entire amount paid (including, without limitation, any interest, penalties and
expenses associated with such payments).

                           (b) An Indemnifying Member's obligation to make
contributions to the Company under this Section 6.9 shall survive the
termination, dissolution, liquidation and winding up of the Company and, for
purposes of this Section 6.9, the Company shall be treated as continuing in
existence. The Company may pursue and enforce all rights and remedies it may
have at law or otherwise against each Indemnifying Member under this Section
6.9.

                                       43
<PAGE>

                                  ARTICLE VII
                                      TAXES

                  7.1 TAX RETURNS. The Company shall cause to be prepared and
filed all necessary federal and state income tax returns for the Company, and
shall make any elections the Board may deem appropriate and in the best
interests of the Members. Each Member shall furnish to the Company all pertinent
information in its possession relating to Company operations that is necessary
to enable the Company's income tax returns to be prepared and filed.

                  7.2 TAX MATTERS MEMBER. KAT Holdings, L.P. shall be the "tax
matters partner" of the Company pursuant to section 6231(a)(7) of the Code (the
"Tax Matters Member"). The Tax Matters Member is authorized to represent the
Company before the Internal Revenue Service and any other governmental agency
with jurisdiction, and to sign such consents and to enter into settlements and
other agreements with such agencies as it deems necessary or advisable. In no
event shall the Tax Matters Member have the right to settle (or to reject an
offer of settlement with respect to) an administrative or judicial proceeding
without the consent of Members entitled to cast a majority of the votes of all
Members entitled to vote at a meeting of the Members and, if such settlement
adversely affects any of the ML Members or the UBS Members, without the prior
written consent of such Members.

                                  ARTICLE VIII
                        BOOKS, REPORTS AND COMPANY FUNDS

                  8.1 MAINTENANCE OF BOOKS. The Company shall keep books and
records of accounts in accordance with GAAP and shall keep minutes of the
proceedings of its Members and each committee. The Fiscal Year shall be the
accounting year of the Company for financial reporting purposes.

                  8.2 MEMBER TAX INFORMATION. Within 90 days after the end of
each Taxable Year, the Board or Officers will cause to be delivered to each
Person who was a Member at any time during such Taxable Year a Form K-1 and such
other information, if any, with respect to the Company, as may be necessary for
the preparation of such Member's federal, state and local income tax returns,
including a statement showing such Member's share of income, gain or loss,
expense and credits for such Taxable Year for federal income tax purposes. Any
deficiency for taxes imposed on any Member (including penalties, additions to
tax or interest imposed with respect to such taxes) shall be paid by such
Member, and if paid by the Company, shall be recoverable from such Member
pursuant to Section 6.9.

                  8.3 COMPANY FUNDS. The Company may not commingle the Company's
funds with the funds of any Member or the funds of any Affiliate of any Member.

                                   ARTICLE IX
                             TRANSFERS OF SECURITIES

                  9.1 TRANSFERS BY MEMBERS.

                           (a) Restrictions on Transfer. No Member may directly
or indirectly (including by means of change of ownership or change of control of
such Member or any Person

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<PAGE>

directly or indirectly controlling such Member if such change is designed to
circumvent the provisions of this Agreement) Transfer any Units, Operating
Company Shares or Convertible Securities, other than in accordance with the
terms and conditions of this Article IX and the other provisions of this
Agreement.

                           (b) Competitors. Notwithstanding anything to the
contrary contained in this Agreement, no Member may Transfer any of its Units,
Operating Company Shares or Convertible Securities to a Competitor or to a
director, officer or Affiliate of a Competitor, except pursuant to (i) the
Registration Rights Agreement, (ii) Rule 144, or (iii) pursuant to Section 9.4
or Section 9.5.

                           (c) Change of Control. Without limiting the
application of Section 9.3(d):

                           (i) Notwithstanding anything contained herein to the
         contrary (but subject to Sections 4.5, 9.4, 9.5, 9.6 and 9.8), for a
         period of three years from the date hereof (i) no Member shall (alone
         or together with one or more other Members) in one transaction or a
         series of related transactions Transfer Units, Operating Company Shares
         or Convertible Securities, if the consummation of such transaction or
         series of related transactions would cause (A) a Change of Control of
         the Company or Operating Company, or (B) KAT Holdings, L.P. and its
         Permitted Transferees to cease to own a majority of the Operating
         Company Share Equivalents owned by KAT Holdings, L.P. on the date
         hereof, in each case without the prior unanimous written consent of the
         Kenner Group, the ML Group and the UBS Group.

                           (ii) Notwithstanding anything contained herein to the
         contrary, from and after the third anniversary of the date hereof until
         the earliest to occur of (A) the 10th anniversary of the date hereof,
         (B) a Change of Control of the Company or the Operating Company and (C)
         a Qualified Public Offering, none of KAT Holdings, L.P. and its
         Permitted Transferees shall (alone or together with one or more other
         such Persons) in one transaction or a series of related transactions
         Transfer Units, Operating Company Shares or Convertible Securities, if
         the consummation of such transaction or series of related transactions
         would cause KAT Holdings, L.P. and its Permitted Transferees to cease
         to own a majority of the Operating Company Share Equivalents owned by
         KAT Holdings, L.P. on the date hereof, in each case without the prior
         consent of the ML Group and the UBS Group; provided, however, that the
         foregoing restrictions shall not apply to any Transfer of Units,
         Operating Company Shares or Convertible Securities to ML IBK Positions,
         Inc., Merrill Lynch Ventures L.P. 2001, UBS Capital Americas II, LLC or
         any of their respective Permitted Transferees; provided further,
         however, that nothing herein shall affect the rights or obligations of
         KAT Holdings, L.P. or any of its Permitted Transferees to effect a
         Transfer pursuant to a transaction contemplated by Section 9.4, 9.5 or
         9.6.

                           (iii) As used in this Section 9.1(c), a Change of
         Control of the Company or the Operating Company shall not apply to a
         Change of Control of the Company or the Operating Company the result of
         which is that KAT Holdings, L.P., ML IBK Positions, Inc., Merrill Lynch
         Ventures L.P. 2001, UBS Capital

                                       45
<PAGE>

         Americas II, LLC or any of their respective Permitted Transferees,
         individually or collectively, become the beneficial owner (as
         determined under rule 13d-3 promulgated under the Exchange Act),
         directly or indirectly, of more than 50% of the Operating Company Share
         Equivalents.

                           (d) Exit Restrictions. Notwithstanding anything
herein to the contrary, (i) no Sale of the Company or Sale of the Operating
Company may be effected pursuant to Section 9.4 or 9.5, as the case may be, in
respect of which (A) 25% or more of the consideration payable to the applicable
sellers (excluding assumption of debt) consists of securities that are not both
transferable without registration under the Securities Act and traded on a
national securities exchange or quoted on the NASDAQ National Market (or any
successor exchange, market or organization thereto), or (B) the consideration
received consists of any securities (x) the Transfer of which is restricted by
contractual arrangement for a period greater than nine months following the date
that such securities are distributed to the applicable sellers, or (y) the
Transfer of which to any of the applicable sellers is prohibited by applicable
law, and (ii) no Leveraged Recapitalization Transaction may be effected in
respect of which (A) 25% or more of the amount of dividends or other
distribution payable pursuant to Section 9.6 to the applicable equity holders
consists of securities that are not both transferable without registration under
the Securities Act and traded on a national securities exchange or quoted on the
NASDAQ National Market (or any successor exchange, market or organization
thereto), or (B) the consideration received consists of any securities (x) the
Transfer of which is restricted by contractual arrangement for a period greater
than nine months following the date that such securities are distributed to the
applicable equity holders, or (y) the Transfer of which to any of the applicable
equity holders is prohibited by applicable law;

                           (e) Void Transfers. Any Transfer or attempted
Transfer of any Units, Operating Company Shares or Convertible Securities in
violation of any provision of this Agreement shall be null and void, and the
Company shall not record such Transfer on its books or, to the fullest extent
permitted by law, treat any purported Transferee of such Membership Interest as
the owner thereof for any purpose.

                           (f) Permitted Transfers. The restrictions set forth
in this Section 9.1, Section 9.2 and Section 9.3 shall not apply with respect to
any Transfer of Units, Operating Company Shares or Convertible Securities by any
Member (i) to any Affiliate of such Member; (ii) in the case any Member that is
a natural person, in lieu of the Persons identified in clause (i), (A) any
Person to which such Units, Operating Company Shares or Convertible Securities
are transferred upon their death, incapacity or otherwise by virtue of the
application or operation of law, judgment or decree, or (B) any member of such
Member's Family Group; (iii) with respect to any Member that is an entity, in
addition to the Persons identified in clause (i), any partners, members or
investors (either directly or indirectly through any investment partnerships or
entities) of such Member who are distributees of investments held by such
Member, but solely pursuant to the liquidation of the applicable investment of
the Transferring Member in which Units, Operating Company Shares or Convertible
Securities, as the case may be, are distributed on a pro rata basis to such
distributees, or (iv) in the case of KAT Holdings, L.P. or any other investment
partnership or entity managed or controlled by Kenner & Company, Inc. (A) KAT
Partners, L.P., KAT Group, L.P. and their respective partners, members and
investors, and (B) any other investment partnership or entity managed or
controlled by Kenner & Company, Inc., in

                                       46

<PAGE>

each case solely to the extent such Transferees are distributees of investments
held by KAT Holdings, L.P. or any other investment partnership or entity managed
or controlled by Kenner & Company, Inc. pursuant to the liquidation of the
applicable investment of the Transferring Member in which Units, Operating
Company Shares or Convertible Securities, as the case may be, are distributed on
a pro rata basis to such distributees (collectively referred to herein as
"Permitted Transferees"). Notwithstanding the foregoing, no party hereto shall
avoid the provisions of this Agreement by making one or more Transfers of Units,
Operating Company Shares or Convertible Securities to one or more Permitted
Transferees and then disposing, in one transaction or a series of related
transactions, of all or any portion of such party's interest in any such
Permitted Transferee.

                           (g) Survival of Restrictions. The Company and each
Member acknowledges and agrees that: (i) all Transferees of Units or
Convertible Securities of the Company under this Article IX who are not parties
to this Agreement shall agree in writing to be bound by the provisions of this
Agreement by executing a joinder agreement substantially in the form attached
hereto as Exhibit B; and (ii) each Bound Party shall cause all Transferees of
Operating Company Shares or Convertible Securities of the Operating Company who
acquire such Operating Company Shares or Convertible Securities of the Operating
Company from a Bound Party to agree in writing to be bound by the following
provisions of this Agreement as a "Member" hereunder (but such Transferees shall
not be deemed "members" for purposes of the Act): Article I; Section 3.7(b);
Section 3.7(c); Section 3.7(e); Section 3.7(f); Section 3.10; Article V; Article
VI; Article IX; Article XI and Article XIII.

                  9.2 FIRST OFFER RIGHT.

                           (a) If any Member desires to Transfer (a "Selling
Member") any of or all its Units, Operating Company Shares or Convertible
Securities to any third party, whether or not such third party has been
identified (the "Proposed Sale"), other than (i) to a Permitted Transferee, (ii)
pursuant to the Registration Rights Agreement, (iii) pursuant to Rule 144, or
(iv) pursuant to Section 9.4, Section 9.5 or Section 9.6, the Selling Member
first shall give a notice (the "First Offer Notice") of such desire to the
Company and each other Member. The First Offer Notice shall specify (A) the
number of Units, Operating Company Shares or Convertible Securities, as the case
may be, proposed to be sold (the "Offered Securities"), (B) the consideration to
be paid for each Offered Security (expressed on a per Operating Company Share
basis) (the "Offer Price"), (C) the identity of the prospective transferee(s)
(if any), and (D) the other terms and conditions of the Proposed Sale. Each
other Member shall have the right to purchase its Proportionate Interest of the
Offered Securities at the Offer Price and on the other terms and conditions of
the Proposed Sale specified in the First Offer Notice by giving notice (the
"Acceptance Notice") to the Selling Member within ten days after receipt of the
First Offer Notice. Any Member that elects to purchase its Proportionate
Interest also may indicate in its Acceptance Notice, if it so elects, its desire
to purchase a portion of the Offered Securities in excess of its Proportionate
Interest, stating the maximum dollar amount of such excess (the "Excess
Amount"). If one or more Members decline to participate in such purchase or
elect to purchase less than such Member's Proportionate Interest, then the pro
rata participations or the balance of such participations of such Members shall
automatically be deemed to be accepted by any Member which sets forth an Excess
Amount in its Acceptance Notice in an amount not greater than such Excess
Amount, such acceptance to be allocated among such Members in

                                       47
<PAGE>

proportion to their respective Proportionate Interests and, if the portion of
the Offered Securities allocable to any accepting Member exceeds its Excess
Amount, such excess shall be allocated among the remaining Members electing to
purchase an Excess Amount in proportion to their respective Proportionate
Interests, and such procedure shall be employed until the entire Excess Amount
of Member electing to purchase an Excess Amount has been satisfied or all the
Offered Securities have been allocated.

                           (b) As used herein, the term "Proportionate Interest"
of a Member means the percentage of Offered Securities offered by a Selling
Member which such Member is entitled to purchase pursuant to Section 9.2(a).
Such percentage, as to each Member shall be determined by dividing the number of
Operating Company Share Equivalents then owned by such Member by the aggregate
number of Operating Company Share Equivalents then owned by all Members who are
entitled to purchase the Offered Securities pursuant to this Section 9.2(a).

                           (c) If the Members fail to elect to purchase the
entire Offered Securities within the time period specified in Section 9.2(a)
(and after compliance with Section 9.3 in the case of any Kenner Member), then
the Selling Member (i) shall be under no obligation to Transfer any Offered
Securities to any Member, and (ii) subject to the provisions of Section 9.2(d),
shall have the right to Transfer, within a period of 90 days after receipt by
the Company of the First Offer Notice, all (but not less than all) the Offered
Securities at a price not less than the consideration to be paid therefor and on
the other terms and conditions as specified in the First Offer Notice to a third
party (the "Third Party"). The purchase price specified in any First Offer
Notice shall be payable solely in cash at the closing of the transaction. If at
the expiration of such 90-day period, the Selling Member has not completed the
Transfer of all the Offered Securities, the Selling Member shall no longer be
permitted to Transfer any such Offered Securities pursuant to this Section 9.2
without again complying with the rights of first offer set forth in this Section
9.2.

                           (d) If (i) any of ML IBK Positions, Inc., Merrill
Lynch Ventures L.P. 2001, UBS Capital Americas II, LLC or their Permitted
Transferees is the Selling Member, (ii) such Selling Member wishes to Transfer
the Offered Securities to the Third Party in accordance with Section 9.2(c),
(iii) the Third Party is any of ML IBK Positions, Inc., Merrill Lynch Ventures
L.P. 2001, UBS Capital Americas II, LLC, KAT Holdings, L.P., KAT Group, L.P. or
their Permitted Transferees, and (iv) the Third Party wishes to purchase such
Offered Securities from the Selling Member, then the Selling Member first shall
deliver written notice thereof (the "First Refusal Notice") to those of KAT
Holdings L.P., KAT Group, L.P., ML IBK Positions, Inc., Merrill Lynch Ventures
L.P. 2001, UBS Capital Americas II, LLC and their Permitted Transferees, as the
case may be, who are not the Third Party (the "First Refusal Members"). The
First Refusal Notice shall specify the Offer Price by the Third Party in the
Transfer and the other terms and conditions thereof, which Offer Price shall be
not less than the Offer Price and on the other terms and conditions as specified
in the First Offer Notice. Each First Refusal Member shall have the right to
purchase its First Refusal Proportionate Interest of the Offered Securities at
the Offer Price and on the other terms and conditions of the Transfer specified
in the First Refusal Notice by giving notice (the "First Refusal Acceptance
Notice") to the Selling Member within seven days after receipt of the First
Refusal Notice. If the First Refusal Members fail to elect to purchase the
entire Offered Securities within the time period specified in this Section

                                       48
<PAGE>

9.2(d), then the Selling Member shall have the right to Transfer the Offered
Securities in accordance with Section 9.2(c).

                           (e) As used herein, the term "First Refusal
Proportionate Interest" of a First Refusal Member means the percentage of
Offered Securities offered by the Selling Member which such First Refusal Member
is entitled to purchase pursuant to Section 9.2(d). Such percentage shall be
determined by dividing the number of Operating Company Share Equivalents then
owned by such First Refusal Member by the aggregate number of Operating Company
Share Equivalents then owned by the Third Party and all the First Refusal
Members (but excluding the Selling Member).

                  9.3 TAG-ALONG RIGHTS.

                           (a) Other than in connection with a Transfer (i) to a
Permitted Transferee, (ii) pursuant to the Registration Rights Agreement, (iii)
pursuant to Rule 144, or (iv) pursuant to Section 9.4, 9.5 or 9.6, at least 30
days prior to any Transfer (the "Tag Along Sale") by any Kenner Member (each, a
"Transferring Member") of Units, Operating Company Shares or Convertible
Securities (the "Tag Along Securities"), after compliance with the requirements
of this Agreement (including Section 9.2), the Transferring Member shall deliver
a written notice (the "Tag Along Notice") to all the other Members (other than
any Kenner Member) (the "Other Members"), specifying in reasonable detail the
identity of the prospective transferee(s) (the "Proposed Transferee"), the
number of Units, Operating Company Shares or Convertible Securities to be
Transferred in the Tag Along Sale and the other terms and conditions of the Tag
Along Sale.

                           (b) Subject to Section 9.3(c), each Other Member
shall have the right to sell to the Proposed Transferee (and the Transferring
Member shall cause the Proposed Transferee to purchase), Units, Operating
Company Shares and/or Convertible Securities owned by such Other Member up to an
amount equal to such Other Member's Tag Along Percentage of the Tag Along
Securities; provided, however, that any Person to whom Operating Company Shares
have been distributed pursuant to Section 4.5 will be entitled to sell Units,
Operating Company Shares and/or Convertible Securities to the Proposed
Transferee (taking into account the number of Operating Company Shares or
Convertible Securities of the Operating Company that such Person is entitled to
sell to the Proposed Transferee) as if such Person were holding a number of
Units at the time of the Proposed Transferee representing, indirectly through
the Company, the same ownership interest in the Operating Company as the
Operating Company Shares owned by such Person. In order to exercise the right
given to each Other Member above in this Section 9.3(b), such Other Member must
deliver to the Transferring Member a notice to such effect within 15 days after
such Other Member has received the Tag Along Notice. If the Other Members have
not elected to exercise such right (through notice to such effect or expiration
of the 15-day period after delivery of the Tag Along Notice), then the
Transferring Member may Transfer the Units, Operating Company Shares or
Convertible Securities specified in the Tag Along Notice at a price and on terms
no more favorable to the Transferring Member than specified in the Tag Along
Notice during the 90-day period immediately following the date of the delivery
of the Tag Along Notice.

                                       49
<PAGE>

                           (c) As used herein, the term "Tag Along Percentage"
of an Other Member means the percentage of Tag Along Securities which such Other
Member is entitled to Transfer pursuant to this Section 9.3. Such percentage, as
to each Other Member shall be determined by dividing the number of Operating
Company Share Equivalents then owned by such Other Member by the aggregate
number of Operating Company Share Equivalents then owned by all Members
participating in the Tag Along Sale (including the Transferring Member).

                           (d) If the consummation of the Tag Along Sale (taking
into account the securities as to which the Other Members have elected to
exercise their rights under this Section 9.3) would cause (i) a Change of
Control of the Company, (ii) a Change of Control of the Operating Company, or
(iii) KAT Holdings, L.P., KAT Group, L.P. and their respective Permitted
Transferees to cease to own a majority of the Operating Company Share
Equivalents held by them on the date hereof, then, each ML Member and each UBS
Member (whether or not they had elected to exercise their rights to participate
in the Tag Along Sale) shall have the right to sell to the Transferee (and the
Transferring Member shall cause the Proposed Transferee to purchase) 100% of the
Units, Operating Company Shares or Convertible Securities held by such Person.
If the Proposed Transferee purchases any of the Units, Operating Company Shares
or Convertible Securities held by any ML Member or UBS Member pursuant to this
Section 9.3(d), it shall purchase such securities at the price and on the other
terms and conditions specified in the Tag Along Notice. This Section 9.3(d) is
not in limitation of the approval rights set forth in Section 5.14.

                           (e) Notwithstanding anything in this Section 9.3 to
the contrary, no Other Member may Transfer in the Tag Along Sale any Convertible
Security owned by it unless such Convertible Security is exercisable as of
immediately prior to the consummation of the Tag Along Sale. Any consideration
payable in respect of any Convertible Security shall be net of its exercise
price or other amount payable in connection with its exercise or conversion.

                           (f) Each Member Transferring Units, Operating Company
Shares or Convertible Securities pursuant to this Section 9.3 shall pay its pro
rata share (determined on a pro rata basis, based on the relative aggregate
amount of consideration received by each Member pursuant to such Transfer of
such securities) of the expenses incurred by the Members and the Company in
connection with such Transfer and shall be obligated to join based on its pro
rata share (determined on a pro rata basis, based on the relative aggregate
amount of consideration received by each Member pursuant to such Transfer of
such securities) in any indemnification or other obligations (including the
making of customary representations and warranties) that the Transferring Member
agrees to provide in connection with such Transfer (other than any (i) such
obligations that relate specifically to a particular Member such as
indemnification with respect to representations and warranties given by a Member
regarding such member's title to and ownership of Units, Operating Company
Shares or Convertible Securities, or (ii) any non-compete agreement,
non-solicitation agreement or other similar restrictive covenant); provided that
no Member shall be obligated in connection with such Transfer to agree to
indemnify or hold harmless the Transferees with respect to an amount in excess
of the net cash proceeds paid to such Member in connection with such Transfer.

                           (g) Any Transfer of Units, Operating Company Shares
or Convertible Securities by a Kenner Member that does not provide the Other
Members with the right to

                                       50
<PAGE>

participate as provided in this Section 9.3 shall be considered void and neither
the Company nor the Operating Company shall give effect to such Transfer. For
the avoidance of doubt, if any Other Member exercises its right under this
Section 9.3, the Tag Along Sale shall not be consummated until such time as the
Proposed Transferee shall have purchased all securities as to which the Other
Members have elected to exercise their rights under this Section 9.3.

                  9.4 SALE OF THE COMPANY.

                           (a) The Exit Triggering Members may request to effect
a Sale of the Company (excluding a Sale of the Company to any Affiliate of any
Exit Triggering Member) by delivery of a written notice to the other Members and
the Company. Each Member shall vote for, consent to and raise no objections
against such Sale of the Company. If the Sale of the Company is structured as a
(i) merger or consolidation, each Member shall waive any dissenters' rights,
appraisal rights or similar rights in connection with such merger or
consolidation, (ii) sale of Units, each Member shall agree to Transfer its
Units, Operating Company Shares and Convertible Securities, or (iii) sale of
assets, (A) each Member shall agree to Transfer its Operating Company Shares and
Convertible Securities of the Operating Company on the terms and conditions
approved by the Exit Triggering Members, and (B) the Company and each Member
shall agree to cause the Operating Company and its Subsidiaries to take all
necessary or desirable actions in connection with (and approve) the consummation
of the Sale of the Operating Company. Each Member holding Units, Operating
Company Shares or Convertible Securities shall take all necessary or desirable
actions in connection with the consummation of the Sale of the Company as
requested by the Exit Triggering Members.

                           (b) The obligations of the Members holding Units,
Operating Company Shares or Convertible Securities, as applicable, with respect
to the Sale of the Company are subject to the satisfaction of the following
conditions: (i) the consideration payable upon consummation of such Sale of the
Company to all Members shall be allocated among the Members based upon each
Member's relative ownership interest, direct or indirect, in the Operating
Company represented by the Units, Operating Company Shares or Convertible
Securities, as applicable, sold by such Member; (ii) upon the consummation of
the Sale of the Company, all of the Members Transferring Units or Operating
Company Shares shall receive the same form of consideration and the same per
Unit (or per Operating Company Share, as applicable) amount of consideration;
(iii) if any Member is given an option as to the form and amount of
consideration to be received in respect of its Units or Operating Shares, all
Members shall be given the same option; and (iv) each Member holding then
currently exercisable Convertible Securities with respect to Units or Operating
Company Shares, as applicable, shall be given an opportunity to either (A)
exercise such rights prior to the consummation of the Sale of the Company and
participate in such sale as a Member holding such Units or Operating Company
Shares, as applicable, or (B) upon the consummation of the Sale of the Company,
receive in exchange for such rights consideration equal to the amount determined
by multiplying (1) the same amount of consideration per Unit or Operating
Company Share, as applicable, of a Units or Operating Company Shares, as
applicable, received by Members holding Units or Operating Company Shares, as
applicable, in connection with the Sale of the Company less the exercise price
per Unit (or Operating Company Share, as applicable) of such Units (or Operating
Company Shares, as applicable) of such rights to acquire such Units (or
Operating Company

                                       51
<PAGE>

Shares, as applicable) by (2) the number of Units (or Operating Company Shares,
as applicable) represented by such rights.

                           (c) If the Company enters into any negotiation or
transaction for which Rule 506 promulgated by the SEC (or any similar rule then
in effect) may be available with respect to such negotiation or transaction
(including a merger, consolidation or other reorganization), each Member that is
not an "accredited investor" (within the meaning of Rule 501(a) promulgated by
the SEC) will, at the request of the Board, appoint a purchaser representative
(as such term is defined in Rule 501 promulgated by the SEC) approved by the
Board and such Members will pay the fees of such purchaser representative.

                           (d) For purposes of this Section 9.4, each Member and
the Company (i) will cooperate with the Exit Triggering Members and the Company,
as appropriate, in the evaluation of the possibility of effecting a Sale of the
Company, (ii) will facilitate the process, including the due diligence process
(legal and business), in respect of any Sale of the Company, (iii) will cause
the Representatives or the directors, as the case may be, of the applicable
Atrium Group Company nominated, appointed or designated by such party to take
all actions to effect a Sale of the Company, and (iv) will use commercially
reasonable efforts (in the case of such Member) or best efforts (in the case of
the Company) to cause the closing of the Sale of the Company.

                           (e) Each Member Transferring Units, Operating Company
Shares or Convertible Securities pursuant to this Section 9.4 shall pay its pro
rata share (based on the relative aggregate amount of consideration received by
each Member pursuant to such Transfer of such securities) of the expenses
incurred by the Members in connection with such Transfer and shall be obligated
to join on the same terms and conditions in any indemnification or other
obligations (including the making of customary representations and warranties)
that the Exit Triggering Members agree to provide in connection with such
Transfer (other than (i) any such obligations that relate specifically to a
particular Member such as indemnification with respect to representations and
warranties given by a Member regarding such Member's title to and ownership of
Units, Operating Company Share or Convertible Securities, or (ii) any
non-compete agreement, non-solicitation agreement or other similar restrictive
covenant); provided that no holder shall be obligated in connection with such
Transfer to agree to indemnify or hold harmless the transferees with respect to
an amount in excess of its net proceeds paid to such holder in connection with
such Transfer.

                  9.5 SALE OF THE OPERATING COMPANY.

                           (a) The Exit Triggering Members may request to effect
a Sale of the Operating Company (excluding a Sale of the Operating Company to
any Affiliate of any Exit Triggering Member) (an "Sale of the Operating
Company") by delivery of a written notice to the other Members and the Company.
Each Member shall vote for, consent to and raise no objections against such Sale
of the Operating Company (to the extent any Members' vote, consent or
authorization in any capacity may be required in connection with such Sale of
the Operating Company). If the Sale of the Operating Company is structured as a
(i) merger or consolidation, the Company and each Member holding Operating
Company Shares or Convertible Securities of the Company shall waive any
dissenters' rights, appraisal rights or

                                       52

<PAGE>

similar rights in connection with such merger or consolidation, (ii) sale of
Operating Company Shares, the Company and each Member shall agree to Transfer
all its Operating Company Shares and Convertible Securities of the Operating
Company, or (iii) sale of assets, the Company and each Member shall agree to
cause the Operating Company and its Subsidiaries to take all necessary or
desirable actions in connection with (and approve) the consummation of the Sale
of the Operating Company. The Company and each Member shall take all necessary
or desirable actions in connection with the consummation of the Sale of the
Operating Company as requested by the Exit Triggering Members.

                           (b) The obligations of the Company and the Members
holding Operating Company Shares or Convertible Securities of the Operating
Company with respect to the Sale of the Operating Company are subject to the
satisfaction of the following conditions: (i) the consideration payable upon
consummation of such Sale of the Operating Company to the Company and the other
stockholders of the Operating Company shall be allocated among the Company and
all other Persons holding Operating Company Shares and Convertible Securities of
the Operating Company based upon their respective pro rata shares of the
outstanding Operating Company Shares on a fully diluted basis being sold; (ii)
upon the consummation the Sale of the Operating Company, the Company and all the
other Persons holding Operating Company Shares or Convertible Securities of the
Operating Company being sold shall receive the same form of consideration for
the Operating Company Shares; (iii) if any Member is given an option as to the
form and amount of consideration to be received in respect of its Operating
Company Shares, all Members shall be given the same option; and (iv) each Person
holding then currently exercisable Convertible Securities of the Operating
Company shall be given an opportunity to either (A) exercise such rights prior
to the consummation of the Sale of the Operating Company and participate in such
sale as a Person holding Operating Company Shares, or (B) upon the consummation
of the Sale of the Operating Company, receive in exchange for such Convertible
Securities consideration equal to the amount determined by multiplying (1) the
same amount of consideration per Operating Company Shares received by Persons
holding such shares in connection with the Sale of the Operating Company less
the exercise price per share of such Convertible Securities by (2) the number of
Operating Company Shares represented by such Convertible Securities.

                           (c) If the Company enters into any negotiation or
transaction for which Rule 506 promulgated by the SEC (or any similar rule then
in effect) may be available with respect to such negotiation or transaction
(including a merger, consolidation or other reorganization), each Member that is
not an "accredited investor" (within the meaning of Rule 501(a) promulgated by
the SEC) will, at the request of the Board, appoint a purchaser representative
(as such term is defined in Rule 501 promulgated by the SEC) approved by the
Board and such Members will pay the fees of such purchaser representative.

                           (d) For purposes of this Section 9.5, each Member and
the Company (i) will cooperate with the Exit Triggering Members and the Company,
as appropriate, in the evaluation of the possibility of effecting an Sale of the
Operating Company, (ii) will facilitate the process, including the due diligence
process (legal and business), in respect of any Sale of the Operating Company,
(iii) will cause the Representatives or the directors, as the case may be, of
the applicable Atrium Group Company nominated, appointed or designated by such
party to take all actions to effect an Sale of the Operating Company, and (iv)
will use commercially

                                       53
<PAGE>

reasonable efforts (in the case of such Member) or best efforts (in the case of
the Company) to cause the closing of the Sale of the Operating Company.

                           (e) Each Member Transferring Operating Company Shares
or Convertible Securities of the Operating Company pursuant to this Section 9.5
shall pay its pro rata share (based on the relative aggregate amount of
consideration received by each Person pursuant to such Transfer of such
securities) of the expenses incurred by the Persons Transferring Operating
Company Shares or Convertible Securities in connection with such Transfer and
shall be obligated to join on the same terms and conditions in any
indemnification or other obligations (including the making of customary
representations and warranties) that the Exit Triggering Members agree to
provide in connection with such Transfer (other than (i) any such obligations
that relate specifically to a particular Person such as indemnification with
respect to representations and warranties given by a Person regarding such
Person's title to and ownership of Operating Company Share or Convertible
Securities of the Operating Company, or (ii) any non-compete agreement,
non-solicitation agreement or other similar restrictive covenant); provided that
no Person shall be obligated in connection with such Transfer to agree to
indemnify or hold harmless the transferees with respect to an amount in excess
of its net proceeds paid to such Person in connection with such Transfer.

                  9.6 LEVERAGED RECAPITALIZATION TRANSACTION RIGHTS.

                           (a) The Exit Triggering Members shall have the right
to cause the Company to use its best efforts to effect (or to cause the
Operating Company to effect) a Leveraged Recapitalization Transaction by
delivering a written notice (which shall set forth reasonable detail the terms
of the proposed Leveraged Recapitalization Transaction) to the Company and the
other Members. Unless the Board or the board of directors of the Operating
Company, as the case may be, determines in its good faith judgment by resolution
duly adopted (after consultation with a financial advisor of nationally
recognized reputation and outside counsel) that the consummation of the proposed
Leveraged Recapitalization Transaction would constitute a breach of its
fiduciary duties under applicable law and subject to the Operating Company's
debt and financing agreements (provided that the proposed Leveraged
Recapitalization Transaction may contemplate a refinancing of the Operating
Company's debt and financing agreements) and applicable fraudulent conveyance
laws, (i) the Company shall (and shall cause the other Atrium Group Companies
to) proceed with, and use their best efforts to consummate and to maximize the
proceeds from, the proposed Leveraged Recapitalization Transaction, and (ii)
each other Member shall cooperate with the Company and the Exit Triggering
Members to effectuate the proposed Leveraged Recapitalization Transaction.

                           (b) Notwithstanding the foregoing, if, in the good
faith judgment of the Company, a Leveraged Recapitalization Transaction at the
time and on the terms requested would interfere with any financing, acquisition,
corporate reorganization or other material transaction or event involving the
Company or the Operating Company or would require the disclosure of material
information which the Company has a bona fide business purpose for preserving as
confidential, the Company may delay the consummation of the proposed Leveraged
Recapitalization Transaction and may withhold efforts to cause the proposed
Leveraged Recapitalization Transaction to be consummated for a period of time
not in excess of 90 calendar days; provided, however, that the Company shall not
invoke this provision to delay

                                       54
<PAGE>

the consummation of a Leveraged Recapitalization Transaction more than two times
during any period of 12 consecutive months.

                  9.7 ENGAGEMENT OF FINANCIAL ADVISOR. At any time after the
fifth anniversary of the date hereof, each of the ML Group and the UBS Group
shall have the right to cause the Company to hire (at the cost and expense of
the Company) an investment bank of recognized international standing selected by
it (a) to determine the fair market value of the Company, and (b) to devise a
plan for either (i) the Sale of the Company, or (ii) the evaluation and pursuit
of strategic alternatives for the Company (including a Leveraged
Recapitalization Transaction or an initial public offering); provided, however,
that the selection of an investment bank that is an Affiliate of ML IBK
Positions, Inc., Merrill Lynch Ventures L.P. 2001, UBS Capital Americas II, LLC
or any of their Permitted Transferees shall be subject to Section 5.14(a)(iv).

                  9.8 QUALIFIED PUBLIC OFFERING.

                           (a) If the Exit Triggering Members wish to evaluate
the possibility of effecting a Qualified Public Offering, then each other Member
shall (i) cooperate with the Exit Triggering Members, and (ii) cause the
Representatives or the directors, as the case may be, of the applicable Atrium
Group Company designated or nominated by such party to consider in good faith a
proposal, if any, to effect the Qualified Public Offering. If the Company and
the Exit Triggering Members decide to proceed with such a Qualified Public
Offering, then each other Member shall use all commercially reasonable efforts
(including entering into customary lock-up agreements) and the Company shall use
its best efforts to cause such Qualified Public Offering to occur and the common
equity securities of the registering entity to be registered under Section 12(b)
or (g) of the Securities Act in the United States and to be listed on the NASDAQ
National Market or the New York Stock Exchange (or any successor exchange,
market or organization thereto). Nothing in this Section 9.8 shall be in
limitation of the rights of any Member under the Registration Rights Agreement.

                           (b) Immediately prior to the consummation of a
Qualified Public Offering in respect of the Company's common equity securities,
the Members and Board will take all necessary and desirable actions in
consummation of any such Qualified Public Offering, and vote for a
recapitalization of the Company into a corporation and/or exchange of the Units
into securities (the "Reclassified Securities") the Board finds acceptable;
provided, however, that (i) the Reclassified Securities provide each Member with
the same or better economic interest, governance, priority and other rights and
privileges as such Member had prior to such recapitalization and/or exchange and
are consistent with the rights and preferences attendant to such Units as set
forth in this Agreement or applicable law as in effect immediately prior to such
Qualified Public Offering and (ii) except as otherwise provided herein, the
provisions of this Agreement apply to the Reclassified Securities and the issuer
thereof as such provisions apply to the Units and the Company, mutatis mutandis.

                  9.9 ASSIGNMENTS GENERALLY.

                           (a) In General. Notwithstanding any other provisions
of this Article IX, no Transfer of any Unit or Convertible Security of the
Company may be made unless:

                                       55
<PAGE>

                           (i) such Transfer would not result in a violation of
                  applicable law, including the Securities Act and any state
                  securities or "Blue Sky" laws applicable to the Company or the
                  Units to be Transferred;

                           (ii) such Transfer would not cause the Company to
                  lose its exemption from the registration requirements of the
                  Investment Company Act;

                           (iii) such Transfer would not cause the Company to
                  lose its status as a partnership for federal income tax
                  purposes and, without limiting the generality of the
                  foregoing, such Transfer will not be effected on or through an
                  "established securities market" or a "secondary market or the
                  substantial equivalent thereof," as such terms are used in
                  Section 1.7704-1 of the Treasury Regulations, and the
                  transferring Member and the transferee shall each have
                  provided a certificate to that effect;

                           (iv) such Transfer would not result in the Company
                  being required to register under Section 12(g) of the
                  Securities Exchange Act of 1934, as amended; and

                           (v) if requested by the Board, the assignor Member
                  shall have provided an opinion of counsel reasonably
                  satisfactory to the Board as to the matters set forth in this
                  Section 9.10 and such other matters as the Board may
                  reasonably request; provided, however, that any such proposed
                  Transfer permitted under Section 9.1(f) shall not require an
                  opinion of counsel, but must otherwise be consummated in
                  compliance with the foregoing clauses (i) through (iv).

         Each Member hereby agrees that it will not Transfer any Unit or
Convertible Security of the Company, except as permitted by this Agreement.

                           (b) Payment of Expenses. Each Member agrees that it
will pay all reasonable expenses, including attorneys' fees, incurred by the
Company in connection with a Transfer of Units or Convertible Securities by that
Member.

                           (c) Assignees.

                           (i) The Company will not recognize for any purpose
                  any purported Transfer of all or any fraction of the Interest
                  of a Member unless the provisions of Article IX shall have
                  been complied with and the Transferee shall have delivered to
                  the Company a joinder agreement in the form of Exhibit B and a
                  dated Transfer notice executed by both the Transferor and the
                  Transferee representing that such Transfer was made in
                  accordance with all applicable laws and regulations.

                           (ii) Any Member which shall Transfer, sell or assign
                  all of its Units and Convertible Securities shall cease to be
                  a Member, and shall cease to have the rights of a Member
                  hereunder.

                           (iii) Anything herein to the contrary
                  notwithstanding, both the Company and the Board shall be
                  entitled to treat the assignor of Units or

                                       56
<PAGE>

                  Convertible Securities of the Company as the absolute owner
                  thereof in all respects, and shall incur no liability for
                  distributions made to it in good faith, until such time as a
                  written assignment that conforms to the requirements of this
                  Article IX has been received by the Company and accepted by
                  the Board.

                           (d) Effective Date. Any Transfer and any related
admission of a Person as a Member in compliance with this Article IX shall be
deemed effective on such date that the Transferee or successor in interest
complies with the requirements of this Agreement.

                  9.10 TRANSFERS BY THE COMPANY. The Company shall not Transfer
any of its Operating Company Shares or Convertible Securities of the Operating
Company (other than pursuant to Section 4.5 or Section 9.5) without the prior
written consent of the Kenner Group, the ML Group and the UBS Group.

                  9.11 PRO RATA DISPOSITIONS. Anything in this Agreement or the
Stockholder Agreement to the contrary notwithstanding, any Transfer by any ML
Member of Units, Operating Company Shares or Convertible Securities to any
Person other than a Permitted Transferee must be made in a manner such that,
following the Transfer, the ratio of the aggregate number of Units, Operating
Company Shares or Convertible Securities held through the Company and the ML
Nominee and Sharing Agreement to any Rollover Shares is the same as the ratio of
the ML Investment to the Rollover Amount; provided, that if this Section is not
complied with, then the provisions of Section 4.2(b) shall be adjusted to the
extent necessary so that the aggregate distributions pursuant to Section 4.2(b)
and Section 2.2 of the ML Nominee and Sharing Agreement are in the same amounts
as if there had been full compliance with this Section, with subsequent
corresponding off-setting adjustments to be made in connection with Transfers of
Units, Operating Company Shares or Convertible Securities held through the
Company and the ML Nominee and Sharing Agreement.

                                   ARTICLE X
                    DISSOLUTION, LIQUIDATION AND TERMINATION

                  10.1 DISSOLUTION. The Company shall be dissolved and its
affairs shall be wound up on the first to occur of the following:

                           (a) the unanimous vote of the Members;

                           (b) the occurrence of any other event under the Act
that terminates the Company, unless a majority in interest of the remaining
Members (within the meaning of Revenue Procedure 95-10, as supplemented by
Revenue Procedure 94-46, or any successor thereto) agree in writing to continue
the Company within 90 days thereafter; and

                           (c) the entry of a decree of judicial dissolution of
the Company under Section 18-802 of the Act.

The death, retirement, resignation, expulsion, incapacity, bankruptcy or
dissolution of a Member, or the occurrence of any other event that terminates
the continued membership of a Member in the Company, shall not cause a
dissolution of the Company, and the Company shall continue in existence subject
to the terms and conditions of this Agreement.

                                       57
<PAGE>

                  10.2 LIQUIDATION AND TERMINATION. On dissolution of the
Company, the Board or such other or additional Member or Members as designated
by the Board shall act as Liquidator(s). The Liquidator(s) shall proceed
diligently to wind up the affairs of the Company and make final distributions as
provided herein and in the Act. The costs of liquidation shall be borne as a
Company expense. Until final distribution, the Liquidator(s) shall continue to
operate the Company properties with all of the power and authority of Board and
Members, subject to the power of the Board to remove and replace such
Liquidator(s). The steps to be accomplished by the Liquidator(s) are as follows:

                           (a) As promptly as possible after dissolution and
again after final liquidation, the Liquidator(s) shall cause a proper accounting
to be made by a recognized firm of certified public accountants of the Company's
assets, liabilities and operations through the last day of the calendar month in
which the dissolution occurs or the final liquidation is completed, as
applicable.

                           (b) The Liquidator(s) shall pay, satisfy or discharge
from Company funds all of the debts, liabilities and obligations of the Company
(including, without limitation, all expenses incurred in liquidation) or
otherwise make adequate provision for payment and discharge thereof (including,
without limitation, the establishment of a cash fund for contingent liabilities
in such amount and for such term as the liquidator may reasonably determine).

                           (c) All remaining assets of the Company shall be
distributed to the Members in accordance with Section 4.2 hereof by the end of
the taxable year of the Company during which the liquidation of the Company
occurs (or, if later, 90 days after the date of the liquidation).

The Liquidator(s) shall cause only cash, evidences of indebtedness and other
securities to be distributed in any liquidation. The distribution of cash and/or
property to a Member in accordance with the provisions of this Section 10.2
constitutes a complete return to the Member of its Capital Contributions and a
complete distribution to the Member of its interest in the Company and all the
Company's property and constitutes a compromise to which all Members have
consented within the meaning of the Act. To the extent that a Member returns
funds to the Company, it has no claim against any other Member for those funds.

                  10.3 CANCELLATION OF CERTIFICATE. On completion of the
distribution of Company assets as provided herein, the Company is terminated,
and shall file a certificate of cancellation with the Secretary of State of the
State of Delaware, cancel any other filings made pursuant to Section 2.1 and
take such other actions as may be necessary to terminate the Company.

                                   ARTICLE XI
                        GENERAL/MISCELLANEOUS PROVISIONS

                  11.1 NOTICES. All notices, requests, demands, approvals,
consents, waivers or other communications required or permitted to be given
hereunder (each, a "Notice") shall be in writing, and shall be (a) personally
delivered, (b) sent by facsimile transmission, provided that the original copy
thereof also is sent by pre-paid, first class, registered or certified mail
(return

                                       58
<PAGE>

receipt requested) or by next-day or overnight mail or courier (to any United
States address) or by an internationally recognized express delivery service (to
any foreign address), (c) sent by pre-paid, first class, registered or certified
mail (return receipt requested) or by next-day or overnight mail or courier (to
any United States address), or (d) delivered by an internationally recognized
express delivery service (to any foreign address), postage and charges prepaid:

                           (i) if to any Member, at the address set forth on
                           Schedule A; and

                           (ii) if to the Company, to ATR Acquisition LLC, c/o
                           Kenner & Company, Inc., 437 Madison Avenue, 36th
                           Floor, New York, NY 10022.

or in the case of the Company, at such other address and numbers as may have
been furnished in a Notice by the Company to the Members; or in the case of any
Member, by such Member to the Company and the other Members. Any Notice shall be
deemed effective or given upon receipt (or refusal of receipt, if properly
delivered).

                  11.2 ENTIRE AGREEMENT. This Agreement and other written
agreements among the Members of even date herewith constitute the entire
agreement among the Members relating to the Company and supersedes all prior
contracts or agreements with respect to the Company, whether oral or written.

                  11.3 EFFECT OF WAIVER OR CONSENT. A waiver or consent, express
or implied, to or of any breach or default by any Person in the performance by
that Person of its obligations hereunder or with respect to the Company is not a
consent or waiver to or of any other breach or default in the performance by
that Person of the same or any other obligations of that Person hereunder or
with respect to the Company. Failure on the part of a Person to complain of any
act of any Person or to declare any Person in default hereunder or with respect
to the Company, irrespective of how long that failure continues, does not
constitute a waiver by that Person of its rights with respect to that default
until the applicable statute-of-limitations period has run.

                  11.4 AMENDMENT OR MODIFICATION. This Agreement and any
provision hereof may be amended or modified from time to time only by a written
instrument adopted by (a) those Members holding a majority of the outstanding
Units, (b) for so long as it owns any Units, Operating Company Shares or
Convertible Securities the Kenner Group, (c) for so long as it owns any Units,
Operating Company Shares or Convertible Securities, the ML Group, and (d) for so
long as it owns any Units, Operating Company Shares or Convertible Securities,
the UBS Group; provided however, that the Kenner Group together with either one
of the ML Group and the UBS Group may amend this Agreement to the extent
necessary to implement any action permissible or consented to under Section
5.14.

                  11.5 BINDING EFFECT. Subject to the restrictions on Transfers
set forth in this Agreement, this Agreement is binding on and shall inure to the
benefit of the Members and their respective heirs, legal representatives,
successors and permitted assigns.

                  11.6 GOVERNING LAW; SEVERABILITY. All issues and questions
concerning the application, construction, validity, interpretation and
enforcement of this Agreement shall be governed by and construed in accordance
with the laws of the state of Delaware, including the Delaware Limited Liability
Company Act, Delaware Code, Title 6, Sections 18-101, et seq., as in

                                       59
<PAGE>

effect from time to time, without giving effect to any choice of law or conflict
of law provision or rule (whether of the State of Delaware or any other
jurisdiction) that would cause the application of the laws of any jurisdiction
other than the State of Delaware.

                  11.7 FURTHER ASSURANCES. In connection with this Agreement and
the transactions contemplated hereby, each Member shall execute and deliver any
additional documents and instruments and perform any additional acts that may be
necessary or appropriate to effectuate and perform the provisions of this
Agreement and those transactions.

                  11.8 WAIVER OF CERTAIN RIGHTS. Each Member irrevocably waives
any right it may have to demand any distributions or withdrawal of property from
the Company or to maintain any action for dissolution (except pursuant to
Section 18-802 of the Act) of the Company or for partition of the property of
the Company.

                  11.9 NOTICE TO MEMBERS OF PROVISIONS. By executing this
Agreement, each Member acknowledges that it has actual notice of (a) all of the
provisions hereof (including, without limitation, the restrictions on the
transfer set forth in Article IX) and (b) all of the provisions of the
Certificate.

                  11.10 COUNTERPARTS. This Agreement may be executed in multiple
counterparts with the same effect as if all signing parties had signed the same
document. All counterparts shall be construed together and constitute the same
instrument.

                  11.11 CONSENT TO JURISDICTION. Each Member irrevocably submits
to the nonexclusive jurisdiction of the United States District Court located in
the State of New York and the state courts of the State of New York, sitting in
City of New York, Borough of Manhattan, for the purposes of any suit, action or
other proceeding arising out of this Agreement or any transaction contemplated
hereby. Each Member further agrees that service of any process, summons, notice
or document by U.S. certified or registered mail to such Member's respective
address set forth above shall be effective service of process in any action,
suit or proceeding in New York with respect to any matters to which it has
submitted to jurisdiction as set forth above in the immediately preceding
sentence. Each Member irrevocably and unconditionally waives any objection to
the laying of venue of any action, suit or proceeding arising out of this
Agreement or the transactions contemplated hereby in the United States District
Court located in the State of New York or the state courts of the State of New
York, sitting in City of New York, Borough of Manhattan, and hereby irrevocably
and unconditionally waives and agrees not to plead or claim in any such court
that any such action, suit or proceeding brought in such court has been brought
in an inconvenient forum.

                  11.12 HEADINGS. The headings used in this Agreement are for
the purpose of reference only and will not otherwise affect the meaning or
interpretation of any provision of this Agreement.

                  11.13 REMEDIES. The Company and the Members shall be entitled
to enforce their rights under this Agreement specifically, to recover damages by
reason of any breach of any provision of this Agreement (including costs of
enforcement) and to exercise any and all other rights existing in their favor.
The parties hereto agree and acknowledge that money damages may

                                       60
<PAGE>

not be an adequate remedy for any breach of the provision as of this Agreement
and that the Company or any Member may in its or his sole discretion apply to
any court of law or equity of competent jurisdiction for specific performance or
injunctive relief (without posting a bond or other security) in order to enforce
or prevent any violation or threatened violation of the provisions of this
Agreement.

                  11.14 SEVERABILITY. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

                  11.15 NO THIRD PARTY BENEFICIARIES. This Agreement shall not
confer any rights or remedies upon any person other than the parties hereto and
their respective successors and permitted assigns and, to the extent specified
herein, their respective Affiliates.

                  11.16 CONFIDENTIALITY.

                           (a) By executing this Agreement, each Member
expressly agrees, at all times during the term of the Company and thereafter and
whether or not at that time it is a Member of the Company, (unless the prior
written consent of the Company is obtained, which prior consent shall not be
unreasonably withheld) to maintain the confidentiality of, not to disclose to
any Person other than the Company, another Member or a Person designated by the
Company, and not to give, sell, use (other than in connection with Company
purposes) or otherwise divulge any information obtained from the Company or its
representatives; provided, however, that such Member may disclose and use such
information (i) if compelled to disclose the same by judicial or administrative
process or by other requirements of applicable law or such disclosure is
necessary so that such member not commit a violation of the rules of any
securities exchange or is necessary or appropriate in connection with any legal
proceeding, (ii) if such information currently is, or hereafter is, in the
public domain through no fault of such Member or any of its Affiliates, (iii) if
such Information is later acquired by such Member from another source and such
Member is not aware that such source is under an obligation to another Person to
keep such information confidential, or (iv) if such information is independently
developed by such Member without reference thereto or reliance thereon.

                           (b) Anything to the contrary herein notwithstanding,
each Member may deliver or disclose confidential information to (i) its
stockholders, partners, members, directors, officers, employees, agents,
attorneys and Affiliates (to the extent such disclosure reasonably relates to
the administration of the investment represented by its interest in the Company
and such Persons agree to comply with the terms of this Section), (ii) its
financial advisors and other professional advisors who agree to comply with the
terms of this Section, (iii) any Person to which it sells or offers to sell its
interest in the Company or any part thereof or any participation therein in
accordance with the transfer restrictions contained in this Agreement (if such
Person has agreed in writing prior to its receipt of such confidential
information to be bound by the provisions of this Section).

                                       61
<PAGE>

                           (c) Anything in this Agreement or any other express
or implied agreement, arrangement or understanding to the contrary
notwithstanding, each party to this Agreement (and each employee, representative
or other agent of such party) may disclose to any and all persons, without
limitation of any kind, the "tax treatment" and "tax structure" (as those terms
are defined in Treasury Regulation Section 1.6011-4) of the transactions
contemplated by this Agreement and all materials of any kind (including opinions
or other tax analyses) that are provided to such Person relating to such tax
treatment and tax structure. This authorization does not extend to disclosure of
any other information, including (i) the identity of any party (or any
representative thereof), (ii) the existence and status of any negotiations, or
(iii) financial, business, legal or personal information of or regarding a party
(or any of its representatives) to the extent not related to the tax treatment
or tax structure of such transactions.

                  11.17 TERMINATION.

                           (a) Individual Termination. This Agreement shall
terminate with respect to any Member at the time at which such Member ceases to
own any Units, Operating Company Shares or Convertible Securities, except that
such termination shall not affect (i) rights perfected or obligations incurred
by such Member under this Agreement prior to such termination, and (ii) rights
or obligations expressly stated to survive such cessation of ownership of Units,
Operating Company Shares or Convertible Securities.

                           (b) Full Termination. This Agreement shall terminate
(i) automatically upon consummation of a Qualified Public Offering, or (ii) upon
the consummation of a Sale of the Operating Company.

                           (c) Survival. Anything herein to the contrary
notwithstanding, the covenants and agreements set forth in Section 6.1 through
and including Section 6.7 shall survive the termination of this Agreement
pursuant to this Section 11.17.

                                  ARTICLE XII
                       VALUATION OF MARKETABLE SECURITIES

                  12.1 VALUATION OF MARKETABLE SECURITIES. For purposes of this
Agreement, the value of any Marketable Securities as of any date (or in the
event such date is not a Business Day, as of the immediately preceding Business
Day) shall be determined as follows:

                           (a) in the case of a Marketable Security which is
listed on a United States securities exchange or on the NMS, such Marketable
Security shall be valued at the average of its last sales price over the 20
Business Days immediately preceding the determination date or, if no sale
occurred on any such date, at the last "bid" price thereon on such date; and

                           (b) in the case of a Marketable Security which is
traded over-the-counter (other than on the NMS) shall be valued at the average
of the most recent "bid" price over the 20 Business Days immediately preceding
the determination date or, if no sale occurred on any such date, at the last
"bid" price thereon on such date; provided, however, that within one Business
Day after the receipt of any such Marketable Security by the Company, the
Company shall give written notice thereof to the Carry Member and if in the good
faith judgment of the

                                       62
<PAGE>

Carry Member the value of such Marketable Security is not accurate, then the
value of such Marketable Security will be reasonably determined by the Carry
Member in good faith within 10 calendar days after the receipt thereof by the
Company (the "Carry Member Valuation"); provided further, however, that the
Carry Member will provide the ML Members and the UBS Members (with a copy to the
Company) with written notice of its determination of such value and any ML
Member or UBS Member may dispute the determination of the Carry Member in the
manner specified in Section 12.2.

                  12.2 VALUATION DISPUTES.

                           (a) Member's Challenge. Each ML Member or UBS Member
(a "Contesting Member") may challenge the valuation of such securities set forth
in the Carry Member Valuation, by giving written notice to the Carry Member
(with copies to the Company and the other ML Members and UBS Members) (a
"Challenge Notice") setting forth the nature of the challenge not later than the
15th Business Day after the Carry Member Valuation is received. If no Challenge
Notice is given on or prior to such 15th Business Day, then the valuation set
forth in the Carry Member Valuation will be the value of such securities for
purposes of such distribution.

                           (b) Resolution by Agreement. If a Challenge Notice is
given, then the Carry Member and the Contesting Member will attempt in good
faith to resolve their dispute as to the valuation of such securities. Any
amount agreed upon in writing at any time by the Carry Member and the Contesting
Member will be the value of such securities for purposes of such distribution.

                           (c) Resolution by Appraiser. If the Carry Member and
the Contesting Member do not resolve their dispute as to the valuation of such
securities prior to the 20th Business Day after the Carry Member Valuation is
given, then the valuation of such securities will be determined by a Person (the
"Appraiser") selected jointly by the Carry Member and the Contesting Member;
provided, however, that, if the Carry Member and the Contesting Member cannot
agree upon a Person to act as the Appraiser, then the Carry Member and the
Contesting Member shall request the American Arbitration Association in New
York, New York to select an independent nationally-recognized investment banking
firm to act as the Appraiser. Promptly after its acceptance of its appointment
as Appraiser, the Appraiser shall render a report setting forth the valuation of
such securities, and the Appraiser will agree to use reasonable efforts to
render such report not later than the 50th Business Day after the Carry Member
Valuation was given. The value of such securities for purposes of the
distribution shall be based upon the value specified in the Appraiser's report.
Resort to the Appraiser as provided in this Section 12.2 shall be the sole
recourse and remedy of the Carry Member and the Contesting Member against one
another with respect to any disputes arising under this Section 12.2, and the
Appraiser's determination shall be conclusive and binding on the Carry Member
and the Contesting Member and shall be enforceable in a court of law.

                           (d) Expenses. The charges and expenses of the
American Arbitration Association and the Appraiser shall be borne by (i) the
Carry Member, if the valuation of such securities as finally determined by the
Appraiser pursuant to this Section 12.2 is lower by more

                                       63
<PAGE>

than 5% than the Carry Member's determination of such value as set forth in the
Carry Member Valuation with respect to such securities, and (ii) the Contesting
Member in all other cases.

                           (e) Final Valuation.

                           (i) The term "Final Valuation" means (A) the Carry
                  Member Valuation if no Contesting Member has delivered a
                  Challenge Notice as provided in Section 12.2(a), or (B) if a
                  Contesting Member has delivered a Challenge Notice as provided
                  in Section 12.2(a), the definitive valuation of the applicable
                  securities agreed to by the Carry Member and the Contesting
                  Member in accordance with Section 12.2(b), or the definitive
                  valuation of such securities as determined by the Appraiser in
                  accordance with Section 12.2(c).

                           (ii) The Carry Member shall provide written notice of
                  the Final Valuation to the Company and each non-Contesting
                  Member within one Business Day after the determination thereof
                  and the Company shall be bound by the Final Valuation for
                  purposes of any distribution pursuant to Section 4.2.

                                  ARTICLE XIII
                                POWER OF ATTORNEY

                  13.1 POWER.(a) Subject to Section 13.1(b), each of the Members
hereby irrevocably makes, constitutes and appoints each Board member and the
liquidating trustee, if any, in such capacity and for so long as it acts as
such, and each of them (each such Person, the "Attorney"), as such Member's true
and lawful agent and attorney-in-fact, with full power to substitute an
Affiliate of such Attorney, and with full power and authority to act in such
Member's name and on such Member's behalf, to make, execute, deliver, swear to,
acknowledge, file and record: (i) copies of this Agreement or the Stockholders
Agreement, and any amendment or modification to this Agreement or the
Stockholders Agreement adopted as herein provided; (ii) the original Certificate
of the Company and the original certificate of incorporation of the Operating
Company and all amendments thereto required or permitted by law and in each case
in accordance with the provisions of this Agreement; (iii) all certificates and
other instruments deemed necessary by the Board or any liquidating trustee to
permit the Company to be treated as a partnership for federal income tax
purposes, or to provide limited liability to Members in each jurisdiction in
which the Company may be doing business; (iv) all agreements, instruments of
transfer, certificates and other documents deemed necessary or desirable by the
Board in connection with a Sale of the Company or a Sale of the Operating
Company, or an incorporation, recapitalization and/or reorganization, or a
Qualified Public Offering approved in compliance and consistent with the terms
and conditions hereof; and (v) all conveyances and other instruments or
documents deemed necessary by the Board or any liquidating trustee to effect the
dissolution or termination of the Company (including a Certificate of
Cancellation) approved in compliance and consistent with the terms and
conditions thereof; (vi) any certificate of fictitious name, if required by law,
for the Company.

                           (b) Prior to taking any of the actions enumerated in
clauses (i) through (vi) of Section 13.1(a), the Attorney shall give notice to
the Member with respect to which the Attorney wishes to exercise its power of
attorney granted pursuant to Section 13.1(a) indicating

                                       64
<PAGE>

the action it wishes to take on such Member's behalf. If within three days after
receipt of such notice the Member has not taken such action, then the Attorney
may take such action on such Member's behalf.

                  13.2 NATURE OF POWER. The power of attorney granted pursuant
to Section 13.1:

                           (a) is coupled with an interest, shall be irrevocable
and shall survive and shall not be affected by the subsequent Incapacity of any
Member;

                           (b) may be exercised by the Attorney, either by
signing separately as attorney-in-fact for each Member or by a single signature
of the Attorney, acting as attorney-in-fact for all of them;

                           (c) shall survive the assignment by a Member of the
whole or any fraction of its Interest, except that, where the assignee of the
whole of such Member's Interest has been approved by the Board for admission to
the Company as a substituted Member, the power of attorney of the assignor shall
survive the delivery of such assignment for the sole purpose of enabling the
Attorney to execute, swear to, acknowledge and file any instrument necessary or
appropriate to effect such substitution; and

                           (d) shall terminate automatically as to an Attorney
if such Attorney dies, is adjudicated incompetent, is dissolved, files a
voluntary petition in bankruptcy or has entered against it an order that such
Attorney is a bankrupt, applies for the appointment of a receiver of all or
substantially all its assets or has entered against it an order appointing such
a receiver, or is convicted of a felony or of fraud.

                                   * * * * * *

                  IN WITNESS WHEREOF, the Members have executed this Agreement
as of the date first set forth above.

                                    COMPANY:

                                    ATR ACQUISITION, LLC

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

                                       65
<PAGE>

                                    MEMBERS:

                                    KAT HOLDINGS, L.P.

                                    By: KAT Group, L.P.
                                        Its General Partner

                                    By: JLK Operations, Inc.
                                        Its General Partner

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

                                       66
<PAGE>

                                    KAT GROUP, L.P.

                                    By: JLK Operations, Inc.,
                                        its General Partner

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

                                       67
<PAGE>

                                    ML IBK Positions, Inc.

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

                                       68
<PAGE>

                                    MERRILL LYNCH VENTURES L.P. 2001

                                    By: Merrill Lynch Ventures, LLC
                                        Its General Partner

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

                                       69
<PAGE>

                                    UBS CAPITAL AMERICAS II, LLC

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

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

                                       70
<PAGE>

                                   SCHEDULE A

<Table>
<Caption>
PARTY                                            NOTICE ADDRESS                         NO. UNITS                $
------------------------               -----------------------------------           ----------------      -------------
<S>                                    <C>                                           <C>                   <C>
KAT HOLDINGS, L.P.                     c/o Kenner & Company, Inc.                             120,800       $120,800,000
                                       437 Madison Avenue, 36th Floor                     ===========       ============
                                       New York, New York 10022
                                       Attn: Jeffrey L. Kenner
                                       Fax: 212-758-0406

                                       with a copy to:

                                       Mayer, Brown, Rowe & Maw LLP
                                       1675 Broadway
                                       New York, New York 10019-5820
                                       Attn: James B. Carlson
                                       Fax: 212-262-1910
KAT GROUP, L.P.                        c/o Kenner & Company, Inc.                               1,300       $  1,300,000
                                       437 Madison Avenue, 36th Floor                     ===========       ============
                                       New York, New York 10022
                                       Attn: Jeffrey L. Kenner
                                       Fax: 212-758-0406

                                       with a copy to:

                                       Mayer, Brown, Rowe & Maw LLP
                                       1675 Broadway
                                       New York, New York 10019-5820
                                       Attn: James B. Carlson
                                       Fax: 212-262-1910

ML IBK POSITIONS, INC.                 Global Private Equity Group                         38,103.721       $ 38,103,721
                                       4 World Financial Center, 23rd Floor               ===========       ============
                                       New York, New York 10080
                                       Attn: Nathan C. Thorne
                                       Copy: Frank Marinaro, Esq.
                                       Fax: 212-449-1119

                                       with a copy to:

                                       Proskauer Rose LLP
                                       1585 Broadway
                                       New York, New York 10036-8299
                                       Attn: James Gerkis, Esq.
                                       Fax: 212-969-2900
</Table>

                                       71
<PAGE>

<Table>
<S>                                    <C>                                           <C>                   <C>
MERRILL LYNCH VENTURES L.P. 2001       Global Private Equity Group                             16,250       $ 16,250,000
                                       4 World Financial Center, 23rd Floor               ===========       ============
                                       New York, New York 10080
                                       Attn: Nathan C. Thorne
                                       Copy: Frank Marinaro, Esq.
                                       Fax: 212-449-1119

                                       with a copy to:

                                       Proskauer Rose LLP
                                       1585 Broadway
                                       New York, New York 10036-8299
                                       Attn: James Gerkis, Esq.
                                       Fax: 212-969-2900

UBS CAPITAL AMERICAS II, LLC           c/o UBS Capital Americas, LLC                           75,000       $ 75,000,000
                                       48 Signal Road                                     ===========       ============
                                       Stamford, CT 06902
                                       Attn: Justin S. Maccarone
                                       Fax: 203-357-8250

                                       with a copy to:

                                       Kaye Scholer LLP
                                       425 Park Avenue
                                       New York, New York  10022
                                       Attn: Nancy E. Fuchs, Esq.
                                       Fax: 212-836-8689

TOTAL                                                                                     251,453.721       $251,453,721
                                                                                          ===========       ============
</Table>

                                       72

<PAGE>

                                                                       EXHIBIT B

                                 FORM OF JOINDER
                                       TO
                       LIMITED LIABILITY COMPANY AGREEMENT

         THIS JOINDER to the Limited Liability Company Agreement, dated as of
_______, ___, 20__ of LLC, a Delaware limited liability company (the "Company"),
by and among certain Persons named therein (the "Agreement"), is made and
entered into as of by and between the Company and ("Holder"). Capitalized terms
used herein but not otherwise defined shall have the meanings set forth in the
Agreement.

         WHEREAS, Holder has acquired certain Units and the Agreement and the
Company requires Holder, as a holder of Units, to become bound by and/or a party
to the Agreement, and Holder agrees to do so in accordance with the terms
hereof.

         NOW, THEREFORE, in consideration of the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties to this Joinder hereby agree as
follows:

                  1. Agreement to be Bound. Holder hereby agrees that upon
execution of this Joinder, it shall become bound by and/or a party to the
Agreement and shall be fully bound by, and subject to, all of the covenants,
terms and conditions of the Agreement as though an original party thereto. In
addition, Holder hereby agrees that Units held by Holder shall be deemed Units
for the purposes of being bound thereby and shall have the rights only as
provided in the Agreement. The Company hereby agrees that upon such execution of
this Joinder by Holder and the Company, Holder shall be deemed admitted to the
Company as a Member of the Company.

                  2. Successors and Assigns. Except as otherwise provided
herein, this Joinder shall bind and inure to the benefit of and be enforceable
by the Members, the Company and their successors and assigns and Holder (only as
provided in the Agreement) and any subsequent holders of Units and the
respective successors and permitted assigns of each of them, so long as they
hold any Units.

                  3. Counterparts. This Joinder may be executed in separate
counterparts each of which shall be an original and all of which taken together
shall constitute one and the same agreement.

                  4. Notices. For purposes of Section 11.1 of the Agreement, all
notices, demands or other communications to the Holder shall be directed to:

                                      [Name]
                                      [Address]
                                      [Facsimile Number]

                  5. GOVERNING LAW. ALL ISSUES AND QUESTIONS CONCERNING THE
APPLICATION, CONSTRUCTION, VALIDITY, INTERPRETATION AND ENFORCEMENT OF THIS
JOINDER SHALL BE GOVERNED BY

<PAGE>

AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, INCLUDING
THE DELAWARE LIMITED LIABILITY COMPANY ACT, DELAWARE CODE, TITLE 6, SECTIONS
18-101, ET SEQ., AS IN EFFECT FROM TIME TO TIME, WITHOUT GIVING EFFECT TO ANY
CHOICE OF LAW OR CONFLICT OF LAW PROVISION OR RULE (WHETHER OF THE STATE OF
DELAWARE OR ANY OTHER JURISDICTION) THAT WOULD CAUSE THE APPLICATION OF THE LAWS
OF ANY JURISDICTION OTHER THAN THE STATE OF DELAWARE.

                  6. Descriptive Headings. The descriptive headings of this
Joinder are inserted for convenience only and do not constitute a part of this
Joinder.

                                    * * * * *

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Joinder as of
the date first above written.

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

                                              [HOLDER]

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

<PAGE>

                                   SCHEDULE C

<Table>
<Caption>
                                                                                            PERCENTAGE
                                                                                            INTEREST IN
                                                          CONVERTIBLE                        OPERATING
                                          CONVERTIBLE    SECURITIES OF     OPERATING          COMPANY
                                         SECURITIES OF     OPERATING        COMPANY            SHARE
MEMBER                    NO. UNITS         COMPANY         COMPANY          SHARES         EQUIVALENTS
----------------------  ------------     -------------   -------------     ----------       -----------
<S>                     <C>              <C>             <C>               <C>              <C>
KAT HOLDINGS, L.P.           120,800               0               0                0           46.09%
                        ============        ========        ========       ==========        ========
KAT GROUP, L.P.                1,300               0               0                0            0.50%
                        ============        ========        ========       ==========        ========
ML IBK POSITIONS, INC     38,103.721               0               0       10,646.279           18.60%
                        ============        ========        ========       ==========        ========
MERRILL LYNCH
VENTURES L.P. 2001            16,250               0               0                0            6.20%
                        ============        ========        ========       ==========        ========
UBS CAPITAL AMERICAS
II, LLC                       75,000               0               0                0           28.62%
                        ============        ========        ========       ==========        ========
TOTAL                    251,453.721               0               0       10,646.279             100%
                        ============        ========        ========       ==========        ========
</Table>

<PAGE>

                              SCHEDULE 5.14(a)(iv)

1.  Management Agreement

2.  ML Fee Agreement

3.  UBS Fee Agreement

4.  Form of ML Nominee and Sharing Agreement (may be entered into at a later
    date)

5.  Form of UBS Nominee and Sharing Agreement (may be entered into at a later
    date)

6.  Rollover and Contribution Agreements, dated the date hereof, between KAT
    Holdings, Inc. (and assumed by the Operating Company as a result of the
    merger of KAT Holdings, Inc. with and into the Operating Company on the date
    hereof) and each of the each of the Persons listed on Annex A hereto

7.  Subscription Agreements, dated the date hereof, between KAT Holdings, Inc.
    (and assumed by the Operating Company as a result of the merger of KAT
    Holdings, Inc. with and into the Operating Company on the date hereof) and
    each of the each of the Persons listed on Annex A hereto

8.  Stockholders' Agreement

9.  Employment Agreement with Jeffrey Hull

10. Warrant issued to Jeffrey Hull

11. Buy-Sell Agreements, dated the date hereof, between the Operating Company
    and each of the each of the Persons listed on Annex A hereto

12. Annual Fees of $25,000 payable to the directors of Operating Company
    pursuant to Stockholders' Agreement

13. Replacement Stock Option Agreements, dated the date hereof, executed
    pursuant to the Atrium Corporation Replacement Stock Option Plan, and by and
    between the Operating Company and each of the Persons listed on Annex A
    hereto relating to the issuance of an aggregate of 1,105 options to the
    grantees of options thereunder

14. Stock Option Agreements, dated the date hereof, executed pursuant to the
    Atrium Corporation 2003 Stock Option Plan, and by and between the Operating
    Company each of the members of management of the Operating Company and its
    Subsidiaries identified on the signature pages thereto relating to the
    issuance of an aggregate of 8,750 options to the grantees of options
    thereunder

15. Registration Rights Agreement dated as of December 10, 2003 by and among the
    Operating Company and the other parties thereto

<PAGE>

16. Contribution Agreement between ML IBK Positions, Inc. and KAT Holdings, Inc.
    pursuant to which ML IBK Positions, Inc. transfers 9,696 shares of series a
    common stock of Atrium in exchange for 10,646.28 shares of common stock in
    KAT Holdings, Inc.

17. Unit Purchase Agreement

18. Purchase Agreement

<PAGE>

                       APPENDIX A TO SCHEDULE 5.14(a)(IV)

Parties to Buy-Sell Agreements executed December 10, 2003

1. Darvin D. Agostinelli

2. Albert D. Ashe

3. Edwin P. Beachly

4. Robert E. Burns*

5. Michael H. Cornwell

6. C. Douglas Cross

7. Cliff B. Darby

8. Michael A. Easterly*

9. Raymond B. Hazledine

10. Jeff L. Hull

11. Evan M. Kaffenes*

12. Eric W. Long*

13. James F. McGlinn

14. Dow W. Pointer*

15. Philip J. Ragona

16. David S. Rascoe*

17. Todd E. Rascoe*

18. Jamey Rentfrow

20. William E. Robinson*

21. Joe B. Thompson

* To be executed upon exercise of options issued pursuant to the Atrium
Corporation Replacement Stock Option Plan

<PAGE>

Parties to Replacement Stock Option Agreements

1. Albert D. Ashe

2. Edwin P. Beachly

3. Robert E. Burns

4. C. Douglas Cross

5. Cliff B. Darby

6. Michael A. Easterly

7. Evan M. Kaffenes

8. Eric W. Long

9. James F. McGlinn

10. Dow W. Pointer

11. David S. Rascoe

12. Todd E. Rascoe

13. Jamey Rentfrow

14. William E. Robinson

<PAGE>

                                  SCHEDULE 5.16

1.  Management Agreement

2.  ML Fee Agreement

3.  UBS Fee Agreement

19. Form of ML Nominee and Sharing Agreement (may be entered into at a later
    date)

20. Form of UBS Nominee and Sharing Agreement (may be entered into at a later
    date)

4.  Stockholders Agreement

5.  Unit Purchase Agreement

6.  Purchase Agreement

7.  Contribution Agreement between ML IBK Positions, Inc. and KAT Holdings, Inc.
    pursuant to which ML IBK Positions, Inc. transfers 9,696 shares of series a
    common stock of Atrium in exchange for 10,646.28 shares of common stock in
    KAT Holdings, Inc.

8.  Registration Rights Agreement<PAGE>
                                                                   EXHIBIT 10.23

================================================================================

                             STOCKHOLDERS AGREEMENT
                                     AMONG
                               ATRIUM CORPORATION
                                      AND

                      THE STOCKHOLDERS (AS DEFINED HEREIN)

                             AS OF DECEMBER 10, 2003

================================================================================

<PAGE>

                             STOCKHOLDERS AGREEMENT

                  THIS STOCKHOLDERS AGREEMENT is made and entered into as of
December 10, 2003, among ATRIUM CORPORATION, a Delaware corporation (the
"Corporation"), and the Stockholders (as hereinafter defined).

                                    RECITALS

                  WHEREAS, ATR Acquisition, LLC, a Delaware corporation (the
"LLC"), is the owner of a majority of the outstanding capital stock of KAT
Holdings, Inc., a Delaware corporation ("Holdings");

                  WHEREAS, Holdings is a party to the Agreement and Plan of
Merger, dated as of October 27, 2003, as amended (the "Merger Agreement"), by
and among Holdings, KAT Acquisition Corp., a Delaware corporation and a wholly
owned Subsidiary of Holdings, the Corporation, and each of the Persons listed on
the Merger Agreement signature pages;

                  WHEREAS, immediately after the Effective Time (as defined in
the Merger Agreement), the LLC and ML IBK Positions will own a majority of the
issued and outstanding shares of capital stock of the Corporation;

                  WHEREAS, immediately after the Effective Time, certain of the
Key Executives (as defined in the LLC Agreement), of the Corporation will own
Convertible Securities of the Corporation to acquire shares of the Corporation's
common stock, par value $0.01 per share (the "Common Stock");

                  WHEREAS, immediately after the Effective Time, KAT Holdings,
L.P., KAT Group, L.P., ML IBK Positions, Inc., Merrill Lynch Ventures, L.P. 2001
and UBS Capital Americas II, LLC will be members of the LLC;

                  WHEREAS, pursuant to Section 4.5 of the LLC Agreement, each
member of the LLC may cause the LLC to redeem all or portion of such member's
units in the LLC in exchange for up to such member's pro rata portion of the
shares of Corporation's Common Stock held by the LLC, all as provided in Section
4.5 of the LLC Agreement, including the condition that such member becomes a
party to this Agreement;

                  WHEREAS, immediately after the Effective Time, each
Stockholder will own, beneficially and of record, the number of shares of Common
Stock and Convertible Securities of the Corporation set forth opposite such
Stockholder's name on Schedule A hereto;

                  WHEREAS, the parties hereto desire to enter into this
Agreement to set forth (i) certain arrangements with respect to the ownership,
operation and management of the Corporation and its Subsidiaries (including the
rights of the Stockholders to transfer their shares of Common Stock and
Convertible Securities), and (ii) their rights, if applicable, to transfer their
Units and Convertible Securities in the LLC.

<PAGE>

                   NOW, THEREFORE, in consideration of the foregoing and of the
mutual covenants and undertakings contained herein, and subject to and on the
terms and conditions herein set forth, the parties hereto agree as follows:

                                   ARTICLE I
                              DEFINITIONS AND TERMS

                  1.1 CERTAIN DEFINITIONS. As used herein, the following terms
shall have the meanings set forth or as referenced below:

                  "AFFILIATE" of, or a Person "AFFILIATED" with, a specified
Person means a Person that directly or indirectly through one or more
intermediaries, Controls, or is Controlled by, or is under common Control with,
the Person specified.

                  "AGREEMENT" shall mean this Agreement, including the exhibits
hereto, as the same may be amended or supplemented from time to time in
accordance with the terms hereof.

                  "BOARD" shall mean the Board of Directors of the Corporation.

                  "BUSINESS DAY" shall mean any day other than a Saturday, a
Sunday or a day on which banks in New York, New York are authorized or obligated
by law or executive order to close.

                  "COMMON STOCK" shall have the meaning set forth in the
Recitals hereto.

                  "CONTROL" means the possession, directly or indirectly, of the
power to direct or cause the direction of the management or policies of a
Person, whether through the ownership of voting securities, by contract or
otherwise.

                  "COVERED PERSON" means: (a) a Stockholder, in its capacity as
such; (b) any Affiliate of any Stockholder (other than the Corporation or any of
its Subsidiaries), in its capacity as such; (c) any Member of the LLC; (d) any
Person acting (or who acted) in the capacity of stockholder, member, manager,
principal, director, officer, employee, advisor or agent of any of the
foregoing; and (e) any Person acting as a director, officer, employee or agent
of the Corporation or any of its Subsidiaries, or who is or was serving at the
request of the Corporation or any of its Subsidiaries as a director, officer,
employee or agent of another corporation, partnership, joint venture, trust or
other enterprise.

                  "DGCL" shall mean the General Corporation Law of the State of
Delaware.

                  "GAAP" shall mean United States generally accepted accounting
principles, consistently applied.

                  "LLC AGREEMENT" means the Amended and Restated Limited
Liability Company Agreement of the LLC dated as of the date hereof, as it may be
amended or modified, a copy of which is attached hereto as Exhibit A.

<PAGE>

                  "NEW SECURITIES" shall mean any shares of capital stock or
other equity securities (or debt securities convertible into such capital stock
or other equity securities) of the Corporation or any of its Subsidiaries,
whether now authorized or not, and rights, options or warrants to purchase said
shares of capital stock and securities of any type whatsoever that are, or may
become, convertible into shares of the Corporation's capital stock or other
Corporation equity securities; provided, however, that the term "New Securities"
shall not include: (i) securities issued in connection with any stock split,
stock dividend, reclassification or recapitalization of the Corporation; (ii)
shares of Common Stock issued (A) to direct or indirect wholly-owned
subsidiaries of the Corporation, or (B) to employees, consultants, officers or
directors of the Corporation or its Subsidiaries pursuant to the grant or
exercise of any stock option, stock purchase or other right pursuant to an
agreement or arrangement that is approved in accordance with the LLC Agreement;
(iii) securities issued in a Public Offering; (iv) securities issued as
consideration in connection with any acquisition approved in accordance with
Section 5.14(b)(vi) of the LLC Agreement; or (v) securities issued to a
third-party institutional lender as additional consideration or interest in
connection with debt financing obtained by the Corporation or any of its
Subsidiaries.

                  "OPERATING COMPANY SHARE EQUIVALENTS" means, with respect to
any Person as of any time, (i) the aggregate number of Shares then owned by such
Person plus (ii) the aggregate number of Shares (without duplication with any
Shares included in clause (i) above) that would then be owned by such Person
assuming (A) the redemption of all Units, if any, then owned by such Person
pursuant to Section 4.5(b) of the LLC Agreement (including Units issuable
pursuant to then exercisable Convertible Securities of the LLC), and (B) the
conversion of all then currently exercisable Convertible Securities of the
Corporation then owned by such Person.

                  "PERSON" shall mean an individual, a corporation, a
partnership, an association, a trust, a limited liability company or any other
entity or organization.

                  "PRO RATA PORTION" shall mean, with respect to each
Stockholder, that number of shares of New Securities as is equal to the product
of (i) the total number of New Securities proposed to be issued, sold or
otherwise Transferred multiplied by (ii) a fraction, the numerator of which is
the number of Shares held by such Stockholder immediately prior to such issuance
or transfer, and the denominator of which is the total number of Shares held by
all Stockholders, in each case on a fully diluted basis.

                  "PUBLIC OFFERING" shall mean a public offering pursuant to an
effective registration statement under the Securities Act (or any comparable
form under any similar statute then in force), covering the offer and sale of
Common Stock.

                  "PUBLIC SALE" means any sale of Common Stock pursuant to a
Public Offering, in accordance with Rule 144 promulgated under the Securities
Act or as part of any Spin-Off.

                  "SECURITIES ACT" means the Securities Act of 1933, as amended,
or any similar federal statute, and the rules and regulations of the Commission
thereunder, as shall be in effect at the time.

<PAGE>

                  "SHARES" shall mean (i) shares of Common Stock, (ii) any other
shares of the Corporation's capital stock issued from time to time, or (iii) any
equity securities of the Corporation issued with respect to the securities
referred to in clause (i) or (ii) above by way of a payment-in kind, stock
dividend, or stock split or in connection with a recapitalization. As to any
particular Shares, such shares shall cease to be Shares for all purposes of this
Agreement when they have been sold or transferred pursuant to a Public Sale, and
the transferee of any Shares pursuant to a Public Sale shall not be considered a
Stockholder for purposes of this Agreement by virtue of the ownership of Shares
transferred pursuant to such Public Sale.

                  "SEC" shall mean the Securities and Exchange Commission or any
other federal agency at the time administering the Securities Act.

                  "SPIN-OFF'" shall mean any distribution by the Corporation or
one of its Affiliates of all of its Shares of any class or series to its public
stockholders, if any.

                  "STOCKHOLDERS" mean the LLC, ML IBK Positions, Inc. and each
Person other than the Corporation who is or becomes bound by this Agreement.

                  "SUBSIDIARY" or "SUBSIDIARY" of a Person is any corporation,
partnership, association or other entity that is directly or indirectly through
one or more intermediaries, Controlled by such Person.

                  "SUBSIDIARY BOARD" has the meaning set forth in Section 3.4
below.

                  "VOTING STOCK" shall mean securities of the Corporation of any
class or series the holders of which are entitled to vote generally in the
election of directors of the Corporation.

                  1.2 GENERAL INTERPRETATIVE PROVISIONS. Terms for which
meanings are defined in this Agreement shall apply equally to the singular and
plural forms of the terms defined. Whenever the context may require, any pronoun
shall include the corresponding masculine and feminine forms. Words such as
"herein", "hereafter", "hereto", "hereby" and "hereunder", when used with
reference to this Agreement, refer to this Agreement as a whole, unless the
context otherwise requires. The words "include", "includes", "included",
"including" and "such as" shall be construed as if followed by the phrase
"without being limited to". No distinction in interpretation shall be made
between the terms "shall" and "will". A reference to a particular gender means a
reference to any gender. Capitalized terms used but not otherwise defined herein
have the respective meanings set forth in the LLC Agreement.

                                   ARTICLE II
                   BUSINESS AND OPERATIONS OF THE CORPORATION

                  2.1 CONDUCT OF BUSINESS; GOVERNANCE PROVISIONS. The parties
agree that the business and operations of the Corporation and its Subsidiaries
will be conducted at all times in accordance and compliance with the LLC
Agreement (including Section 5.14 thereof). The Corporation and the Stockholders
(a) shall take all necessary and desirable actions within their

<PAGE>

respective direct or indirect control to permit the LLC to comply with all its
covenants and agreements contained in the LLC Agreement and shall fully
cooperate (and the Corporation shall cause its Subsidiaries to cooperate fully)
with the LLC to effectuate the foregoing, and (b) shall fully implement (and the
Corporation shall cause its Subsidiaries to implement fully) the governance
provisions of this Agreement and the LLC Agreement.

                  2.2 CHIEF EXECUTIVE OFFICER. The initial Chief Executive
Officer of the Corporation shall be Jeff L. Hull, who shall be engaged and
employed as such pursuant to the Employment Agreement made and entered into as
of December 10, 2003 by and between Hull and the Corporation.

                                  ARTICLE III
                               BOARD OF DIRECTORS

                  3.1 GENERAL. From and after the Effective Time (as defined in
the Merger Agreement), each Stockholder will vote all of its respective Shares
and any other Voting Stock over which it possesses direct or indirect voting
power and will take all other necessary or desirable actions within its direct
or indirect control (whether in its capacity as a stockholder of the Corporation
or otherwise), and the Corporation will take all necessary and desirable actions
within its control, in order to give effect to the provisions of this Article
III.

                  3.2 POWERS. Subject to the provisions of the DGCL, the
Certificate of Incorporation of the Corporation, the By-laws of the Corporation,
the LLC Agreement and this Agreement, the business and affairs of the
Corporation shall be managed by or under the direction of the Board.

                  3.3 SIZE AND COMPOSITION. The Board shall consist of seven
individuals as follows: (i) two directors shall be designated in writing by the
Kenner Group (the "KENNER DIRECTORS"); (ii) two directors shall be designated in
writing by the Kenner Group (the "SPECIAL KENNER DIRECTORS"); (iii) one director
shall be designated in writing by the ML Group (the "ML DIRECTOR"); (iv) one
director shall be designated in writing by the UBS Group (the "UBS DIRECTOR");
and (v) the remaining director shall be the Chief Executive Officer of the
Corporation (the "CEO DIRECTOR").

                  3.4 SIZE AND COMPOSITION OF SUBSIDIARY BOARD. The size and
composition of the board of directors or similar governing body of Atrium
Companies, Inc. and the manner in which the initial members and any subsequent
members (including any subsequent member selected or appointed to fill a
vacancy) of such board of directors are appointed and/or removed will be the
same as that of the Board. At the request of any Person who has the right to
nominate one or more directors to the Board, the Corporation shall cause the
same director or directors to be elected to the board of directors or similar
governing body of any of its other Subsidiaries, as requested by such Person,
and shall give notice thereof to each other Person entitled to nominate

<PAGE>

one or more directors to the Board. The board of directors (or similar governing
body) of each Subsidiary of the Corporation is sometimes referred to herein as a
"SUBSIDIARY BOARD".

                  3.5 TERM; REMOVAL; VACANCIES. The members of the Board or any
Subsidiary Board other than the CEO Director shall hold office at the pleasure
of the Person which designated them. Any such Person may at any time, by written
notice to the Stockholders and the Corporation, remove (with or without cause)
any member of the Board or any Subsidiary Board designated by such Stockholder
other than the CEO Director. At each election of directors (or filling of a
vacancy with respect to the CEO Director), the Stockholders shall elect the
individual then serving as the Chief Executive Officer of the Corporation as the
CEO Director and remove the CEO Director if the CEO Director ceases to serve as
the Chief Executive Officer of the Corporation. Subject to applicable law, no
member of the Board or any Subsidiary Board may be removed except by written
request by the Person that designated the same. In the event a vacancy occurs on
the Board (or a Subsidiary Board) for any reason, the vacancy will be filled by
the written designation of the Person entitled to designate the director
creating the vacancy. Anything herein to the contrary notwithstanding, a Special
Kenner Director may not be designated or replaced without the prior written
consent of the ML Group and the UBS Group, which consent shall not be
unreasonably withheld.

                  3.6 MEETING OF THE BOARD.

                  (a) Meetings. The Board may hold meetings either within or
outside the state of Delaware. The Board shall hold regular meetings at least
quarterly, at such time and at such place as the Board may designate. Special
meetings of the Board shall be held promptly upon the request of any member of
the Board. At least five days (in the case of a regular meeting) or 48 hours (in
the case of a special meeting) prior to any meeting of the Board (or, in each
case, upon such shorter notice as may be approved by all of the members of the
Board), the Corporation shall deliver to each director notice, an agenda and any
other relevant materials for such meeting, either personally, by mail, by
telecopier, by telegram or by any other means of communication reasonably
calculated to give notice. Any Representative may waive the requirement of such
notice as to himself.

                  (b) Conduct of Meeting. The Board may meet in person or by
means of conference telephone or similar communications equipment by means of
which all persons participating in the meeting can hear and speak to each other.
Each member of the Board may participate in any meeting by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear and speak to each other, and such
participation in a meeting shall constitute presence in person at the meeting.

                  (c) Quorum. A majority of the directors which have been
designated pursuant to the provisions of this Agreement and who are then in
office shall be necessary to constitute a quorum of the Board for purposes of
conducting business; provided, however, that no quorum shall exist unless either
one of the Kenner Directors (if one has been designated pursuant to the
provisions of this Agreement), the ML Director (if one has been designated
pursuant to the provisions of this Agreement) and the UBS Director (if one has
been designated pursuant to the provisions of this Agreement) are present at
such meeting; provided further, however, that

<PAGE>

notwithstanding the preceding, the Board shall not have the power to authorize,
facilitate or permit any of the actions listed in Section 5.14 of the LLC
Agreement, other than in accordance with the terms of that Section. If at any
meeting of the Board or any Subsidiary Board a quorum is not present, a majority
of the directors present may, without further notice, adjourn the meeting from
time to time until a quorum is obtained. Each Stockholder shall use its
reasonable efforts to ensure that a quorum is present at any duly convened
meeting of the Board or any Subsidiary Board.

                  3.7 VOTING; WRITTEN CONSENTS.

                  (a) Each member of the Board and each Subsidiary Board shall
be entitled to cast one vote on each matter considered by the Board. Except as
otherwise expressly provided by this Agreement, the act of a majority of the
members of the Board present at any meeting at which a quorum is present shall
constitute an act of the Board.

                  (b) Except as may otherwise be provided by applicable law, any
action required or permitted to be taken at any meeting of the Board or any
committee thereof may be taken without a meeting pursuant to a written consent,
in compliance with the DGCL and such written consent is filed with the minutes
of the proceedings of the Board or such committee.

                  3.8 DEVOTION OF TIME. Other than any member of the Board who
may be an Officer, the members of the Board shall not be obligated and shall not
be expected to devote all or any portion of their time or business efforts to
the affairs of the Corporation.

                  3.9 COMMITTEES.

                         (a) Subject to Section 3.9(b), the Board shall
designate from among the members of the Board an audit committee, a compensation
committee and one or more other committees (each, a "Committee") to serve at the
pleasure of the Board; provided, however, that the Board may not delegate the
overall functioning of the Board to any Committee. Except as required by
applicable securities laws or listing requirements, no Committee shall have the
right to exercise any power or authority of the Board, and all recommendations
of a Committee shall require approval of the Board prior to becoming effective.

                         (b) Each of the ML Group and the UBS Group shall, for
so long as it has the right to designate a director to the Board, be entitled to
designate a member of the compensation committee and the audit committee of the
Board and any Subsidiary Board, to the extent permitted by applicable law or
listing requirements. If at any time the ML Group or the UBS Group, as the case
may be, does not have a designee on the compensation committee or the audit
committee of the Board or a Subsidiary Board, then, during such time, it shall
have the right to designate an observer of any such committee or comparable
body, which observer shall have such rights with respect to such committee or
comparable body as an observer designated pursuant to Section 3.10 has with
respect to the Board.

<PAGE>

                  3.10 OBSERVERS AT BOARD MEETINGS. Each of the Kenner Group,
the ML Group and the UBS Group shall, for so long as it has the right to
designate a director to the Board, be entitled to designate a single observer
who shall be permitted (but not required) to attend and participate in meetings
of the Board and each other Subsidiary Board and any meetings of any committees
(including audit committees) of any thereof and shall be entitled to receive all
notices, reports and other material sent to the Board members (including
committee members) of the Corporation or a Subsidiary Board. For purposes of
attending any meeting of the Board, such observer shall not be permitted to vote
on any matter and shall not participate in any action of the Board or the
applicable Subsidiary Board or any such committees. The Corporation shall
reimburse any observer of the Kenner Group, the ML Group and the UBS Group for
all reasonable out-of-pocket expenses incurred by such observer in connection
with attendance at meetings of the Board or any Subsidiary Board.

                  3.11 PAYMENTS TO BOARD MEMBERS, REIMBURSEMENTS. No member of
the Board or of a Subsidiary Board shall be entitled to remuneration by the
Corporation or the applicable Subsidiary for services rendered in its capacity
as such (other than for reimbursement of those expenses described in the next
succeeding sentence or in the case of each non-executive Board member an annual
fee of $25,000). All members of the Board and Subsidiary Boards will be entitled
to reimbursement of their reasonable out-of-pocket expenses incurred in
connection with their attendance at meetings of the Board.

                  3.12 INITIAL DIRECTORS. The following six individuals are the
members of the Board on the date hereof: Jeffrey L. Kenner and Mark L. Deutsch
(the initial Kenner Directors); Nathan Thorne (the initial ML Director); Justin
S. Maccarone (the initial UBS Director); Larry Solari (the initial Special
Kenner Director); and Jeff L. Hull (the initial CEO Representative). Each
Stockholder and the Corporation agrees that the vacancy on the Board on the date
hereof in respect of the second Special Kenner Director will be filled (if at
all) following the date hereof in a manner consistent with the provisions of
this Article III (including Sections 3.3 and 3.5).

                  3.13 TERMINATION OF RIGHTS. The rights of each of the Kenner
Group, the ML Group and the UBS Group set forth in this Article III shall
terminate at such time as the Kenner Group, the ML Group or the UBS Group, as
the case may be, ceases to own at least 10% of the Operating Company Share
Equivalents then outstanding.

                                   ARTICLE IV
                          ACCOUNTING, BOOKS AND RECORDS

                  4.1 FISCAL YEAR. The fiscal year of the Corporation shall be
the period commencing January 1 in any year and ending December 31 of that year.

                  4.2 BOOKS AND RECORDS. The Corporation shall keep at its
principal executive offices books and records typically maintained by Persons
engaged in similar businesses and

<PAGE>

which set forth a true, accurate and complete account of the business and
affairs of the Corporation and its Subsidiaries, including a fair presentation
of all income, expenditures, assets and liabilities thereof. Such books and
records shall include all information reasonably necessary to permit the
preparation of financial statements required by applicable law in accordance
with GAAP.

                  4.3 LLC AGREEMENT; STOCKHOLDERS AGREEMENT. The Corporation
shall keep at its principal executive a true complete and correct copy of this
Agreement and the LLC Agreement.

                                    ARTICLE V
                             TRANSFER OF SECURITIES

                  5.1 GENERAL.

                  (a) The names, addresses and ownership of Shares and
Convertible Securities of the Corporation held by the Stockholders, as of the
date hereof, are set forth on Schedule A hereto. From time to time, the
Corporation shall amend the share register of the Corporation and Schedule A
hereto solely to reflect changes therein as a result of transfers effected in
compliance with this Agreement.

                  (b) Upon the request of any Stockholder, the Corporation
shall: (i) promptly supply to such Stockholder or its prospective Transferees of
Shares or Convertible Securities permitted hereunder, all information regarding
the Corporation reasonably required to be delivered in connection with a
Transfer or proposed Transfer of Shares or Convertible Securities, provided that
such Transferee enters into a reasonable and customary confidentiality agreement
with respect to such information; and (ii) otherwise cooperate and take all
other actions as reasonably requested by such Stockholder in connection with any
Transfers permitted pursuant to the terms of Article V.

                  5.2 RESTRICTIONS ON TRANSFER. Each Stockholder who acquires
Shares or Convertible Securities of the Corporation from a Bound Party hereby
agrees to be bound by the following provisions of the LLC Agreement as a
"Member" thereunder (but shall not be deemed a "member" for purposes of the
Act): Article I; Section 3.7(b); Section 3.7(c); Section 3.7(e); Section 3.7(f);
Section 3.10; Article V; Article VI; Article IX; Article XI and Article XIII.
Each other Stockholder who is not a party to the LLC Agreement hereby agrees to
be bound by, and shall have the rights set forth in, the provisions of Article
IX of the LLC Agreement (relating to Transfers, as if relating to Shares) as a
"Member" thereunder (but shall not be deemed a "member" for purposes of the
Act). Any purported Transfer of Shares or Convertible Securities in any other
manner, shall be null and void, and shall not be recognized or given effect by
the Corporation or any Stockholder.

<PAGE>

                  5.3 EXIT RIGHTS. The Corporation and the Stockholders shall
cooperate fully with the LLC and the Exit Triggering Members (as defined in the
LLC Agreement), and shall take all necessary and desirable actions within their
respective direct or indirect control, to cause to be effectuated the
transactions contemplated by Sections 9.4, 9.5, 9.6, 9.7 and 9.8 of the LLC
Agreement (in each case, treating the Member as a Stockholder for purposes of
this Agreement).

                  5.4 LEGENDS. A copy of this Agreement shall be filed with the
Secretary of the Corporation and kept with the records of the Corporation. Each
of the Stockholders hereby agrees that each outstanding certificate representing
Shares or Convertible Securities shall bear a conspicuous legend reading
substantially as follows:

           "The securities represented by this Certificate have not been
           registered under the Securities Act of 1933, as amended, or the
           applicable state and other securities laws and may not be sold,
           pledged, hypothecated, encumbered, disposed of or otherwise
           transferred without compliance with the Securities Act of 1933, as
           amended, or any exemption thereunder and applicable state and other
           securities laws. The securities represented by this Certificate are
           subject to the restrictions on transfer and other provisions of the
           Limited Liability Company Agreement of ATR Acquisition, LLC dated as
           of December 10, 2003 (as amended from time to time, the "LLC
           Agreement") and a Stockholders Agreement dated as of December 10,
           2003, (as amended from time to time, the "Stockholders Agreement")
           among Atrium Corporation (the "Corporation") and certain of its
           stockholders, and may not be sold, pledged, hypothecated, encumbered,
           disposed of or otherwise transferred except in accordance therewith.
           Copies of the LLC Agreement and the Stockholders Agreement are on
           file at the principal executive offices of the Corporation."

                  5.5 JOINDER. The Corporation will not recognize for any
purpose any purported Transfer of all or any fraction of any Shares or
Convertible Securities unless the provisions of this Article V shall have been
complied with and the Transferee shall have delivered to the Corporation a
joinder agreement in substantially the form of Exhibit A and a dated Transfer
notice executed by both the Transferor and the Transferee representing that such
Transfer was made in accordance with all applicable laws and regulations.

                                   ARTICLE VI
                         RIGHTS ON NEW SECURITY ISSUANCE

                  6.1 PREEMPTIVE RIGHTS.

                  (a) The Corporation hereby grants to each Stockholder the
irrevocable and exclusive first option (the "FIRST OPTION") to purchase all or
part of its Pro Rata Portion of any

<PAGE>

New Securities that the Corporation may, from time to time after the date of
this Agreement, propose to issue and sell or otherwise transfer.

                  (b) The Corporation acknowledges and agrees that the First
Option of the LLC may be exercised (or caused to be exercised) by the Members,
at their election and in their respective interests, as provided in Section
3.5(f) of the LLC Agreement.

                  (c) If the Corporation proposes to undertake an issuance, sale
or other Transfer of New Securities, it shall give each Stockholder written
notice of its intention (the "Issuance Notice") describing the price and terms
upon which the Corporation proposes to issue such New Securities. During the
15-day period following the date of delivery of the Issuance Notice (the
"Election Period") each Stockholder may exercise his, her or its right to
purchase New Securities in accordance with this Section 6.1, for the price and
upon the terms and conditions specified in the Issuance Notice by giving written
notice to the Corporation and stating therein the quantity of New Securities to
be purchased.

                  (d) If a Stockholder elects not to exercise its rights
pursuant to this Section 6.1, whether in full or in part, each other Stockholder
shall have the right to subscribe for the unsubscribed portion of such
non-electing Person's Pro Rata Amount (the "Excess Amount"). If the subscription
for the non-electing Person's Excess Amount exceeds such Excess Amount, each the
subscribing Person shall be entitled to subscribe for such Person's pro rata
portion of such Excess Amount based on the ratio that the number of Shares held
by such Person on such date on a fully diluted basis (assuming the exercise,
exchange or conversion, as the case may be, of all the then exercisable
Convertible Securities of the Corporation held by such subscribing Person) bears
to the aggregate number of Shares held by all such subscribing Persons on a
fully diluted basis (assuming the exercise, exchange or conversion, as the case
may be, of all the then exercisable Convertible Securities of the Corporation
held by all such Persons), with the provisions of this sentence to be applied
repeatedly, until all of the New Securities have been allocated, or no
Stockholder desires to subscribe for any of the New Securities that remain
unallocated.

                  (e) In the event that any New Securities remain following the
operation of the preceding paragraph (d), the Corporation shall have 90 days
following the Election Period to issue the New Securities not elected to be
purchased by Stockholders at the price and upon terms not more favorable to the
prospective purchasers of such New Securities than those specified in the
Issuance Notice. In the event the Corporation has not issued the New Securities
within such 90-day period, the Corporation shall not thereafter issue or
otherwise Transfer such New Securities without first offering such New
Securities to the Stockholders in the manner provided in this Section 6.1.

                  6.2 CLOSING OF PURCHASE. If Stockholders and third parties do
not elect to purchase all of the New Securities set forth in the Issuance
Notice, then the Corporation may elect not to issue, and any Stockholder may
elect not to purchase, any New Securities. If a Stockholder elects to purchase
any New Securities pursuant to this Section 6.1, the closing of

<PAGE>

such purchase shall occur concurrently with any purchase of the New Securities
set forth in the Issuance Notice that other Stockholders and third parties have
elected to purchase at such time (but not earlier than 30 days after the date of
the Issuance Notice) and at such location selected by the Corporation. At the
consummation of any purchase and sale of New Securities pursuant to this
Section: (a) the Corporation shall issue or otherwise transfer to the
Stockholder the certificates evidencing the New Securities being purchased,
together with such other documents or instruments reasonably required by counsel
for the Stockholder to consummate such purchase and sale; (b) the Stockholder
will deliver the cash consideration payable by wire transfer of immediately
available funds to an account or accounts designated in writing by the
Corporation (such designation to be made no later than two Business Days prior
to the date of such consummation); (c) the Corporation shall deliver to the
Stockholder a written representation that the New Securities are being purchased
and sold free and clear of any and all encumbrances; and (d) the Stockholder
shall deliver to the Corporation such written investment representations as may
reasonably be required by counsel to the Corporation for securities laws
purposes and all other applicable representations and warranties as other
purchasers of New Securities.

                  6.3 ASSIGNMENT OF RIGHTS. Any right of a Stockholder to
acquire New Securities of the Corporation pursuant to Section 6.1 may be
assigned by such Stockholder to any of its Affiliates.

                  6.4 CONSENT TO ISSUANCES. Anything in this Article VI to the
contrary notwithstanding, no issuance of Shares or Convertible Securities may be
made without prior compliance in full with the requirements of Section
5.14(b)(i) of the LLC Agreement.

                                  ARTICLE VII
              LIABILITY, EXCULPATION, INDEMNIFICATION AND INSURANCE

                  7.1 INDEMNIFICATION. To the fullest extent permitted by
applicable law, the Corporation shall, and shall cause each other Atrium Group
Company to, indemnify and hold harmless each of the Covered Persons from and
against any and all liabilities, obligations, losses, damages, expenses
(including legal and accounting fees and expenses, costs of investigation and
sums paid in settlement), taxes and interest and penalties thereon (other than
taxes based on fees or other compensation received by such Covered Person from
the Corporation), judgments, fines, settlements and other amounts (collectively,
"Indemnified Costs") arising from all claims, demands, actions, suits,
proceedings (whether civil, criminal, administrative, investigative or
otherwise) (collectively, "Indemnified Actions"), in which the Covered Person
may be involved, or threatened to be involved, as a party or otherwise arising
of its status as (a) a Stockholder of the Corporation or as a Member of the LLC,
(b) a member of the Board, (c) an Affiliate of a member of the Board,
Stockholder or the Corporation, or (d) director, manager, officer, shareholder,
stockholder, partner, employee or agent of any of the foregoing Persons or of
any of the Corporation's Subsidiaries, regardless of whether the Covered Person
continues in such capacity at the time any such liability is paid or incurred,
and regardless of whether any such Indemnified Action is brought by a third
party, a stockholder, or by or in the right of the Corporation, any of its
Subsidiaries or the LLC; provided, however, that a Covered Person shall

<PAGE>

not be entitled to indemnification hereunder against Indemnified Costs that are
primarily attributable to (i) the failure of such Covered Person to act in good
faith and in a manner the Covered Person reasonably believed to be in or not
opposed to the best interests of the Corporation, (ii) any fraudulent act or
conduct by such Covered Person, or (iii) in the case of a Stockholder, such
Stockholder's knowing breach or violation of this Agreement.

                  7.2 ADVANCEMENT OF EXPENSES. To the fullest extent permitted
by applicable law and consistent with Section 7.1, the Corporation shall pay the
Indemnified Costs incurred by a Covered Person in defending any Indemnified
Action as such Indemnified Costs are incurred by such Covered Person and in
advance of the final disposition of such matter, provided that such Covered
Person undertakes in writing to repay such expenses if it is determined by
agreement between such Covered Person and the Corporation or, in the absence of
such an agreement, by a final judgment of a court of competent jurisdiction that
such Covered Person is not entitled to be indemnified pursuant to Section 7.1.
Any claim for advancement of expenses shall set forth in reasonable detail the
basis for the claim.

                  7.3 NOTICE OF PROCEEDINGS. Promptly after receipt by a Covered
Person of notice of the commencement of any proceeding against such Covered
Person, such Covered Person shall, if a claim for indemnification in respect
thereof is to be made against the Corporation, give written notice to the Board
of the commencement of such proceeding; provided, however, that the failure of a
Covered Person to give notice as provided herein shall not relieve the
Corporation of its obligations under Sections 7.1 and 7.2, except to the extent
that the Corporation is prejudiced by such failure to give notice. In case any
such proceeding is brought against a Covered Person (other than a proceeding by
or in the right of the Corporation), after the Corporation has acknowledged in
writing its obligation to indemnify and hold harmless the Covered Person, the
Corporation will be entitled to assume the defense of such proceeding; provided,
however that (i) the Covered Person shall be entitled to participate in such
proceeding and to retain its own counsel at its own expense and (ii) if the
Covered Person shall give notice to the Corporation that in its good faith
judgment certain claims made against it in such proceeding could have a material
adverse effect on the Covered Person or its Affiliates other than as a result of
monetary damages, the Covered Person shall have the right to control (at its own
expense and with counsel reasonably satisfactory to the Corporation) the defense
of such specific claims with respect to the Covered Person (but not with respect
to the Corporation or any other Stockholder); provided further, however, that if
a Covered Person elects to control the defense of a specific claim with respect
to such Covered Person, such Covered Person shall not consent to the entry of a
judgment or enter into a settlement that would require the Corporation to pay
any amounts under Section 7.1 without the prior written consent of the
Corporation, such consent not to be unreasonably withheld. After notice from the
Corporation to such Covered Person acknowledging the Corporation's obligation to
indemnify and hold harmless the Covered Person and electing to assume the
defense of such proceeding, the Corporation will not be liable for expenses
subsequently incurred by such Covered Person in connection with the defense
thereof. Without the consent of such Covered Person, the Corporation will not
consent to the entry of any judgment or enter into any settlement; provided,
however, that the consent of such Covered Person shall not be unreasonably
withheld if such judgment or settlement includes as an unconditional term
thereof the giving by the claimant or plaintiff to such Covered Person of a
release from all liability arising out of the proceeding and claims asserted
therein. Any decision that is required to be made by the Corporation pursuant to
Section 7.1 or Section 7.2 or this

<PAGE>

Section 7.3 shall be made on behalf of the Corporation by the affirmative vote
of a majority of the members of the Board who do not have a financial or other
interest in the outcome of the decision, even though such members of the Board
are less than a quorum or, if there are no such members of the Board, by those
Stockholders then holding a majority of the outstanding Shares held by all
Stockholders.

                  7.4 INSURANCE. The Corporation will purchase and maintain
insurance, to the extent, in such amounts and on behalf of such Covered Persons
and such other Persons as the Kenner Group, the ML Group and the UBS Group
shall, in their discretion, determine to be acceptable, against any liability
that may be asserted against or expenses that may be incurred by any such Person
in connection with the activities of the Corporation or such indemnities,
regardless of whether the Corporation would have the power to indemnify such
Person against such liability under the provisions of this Agreement or by law.

                                  ARTICLE VIII
                                   TERMINATION

                  8.1 INDIVIDUAL TERMINATION. This Agreement shall terminate
with respect to any Stockholder at the time at which such Stockholder ceases to
own any Units, Shares or Convertible Securities of the LLC or the Corporation,
except that such termination shall not affect (a) rights perfected or
obligations incurred by such Stockholder under this Agreement prior to such
termination, and (b) rights or obligations expressly stated to survive such
cessation of ownership of Shares, Units or Convertible Securities of the LLC or
the Corporation.

                  8.2 FULL TERMINATION. This Agreement shall terminate (a)
automatically upon consummation of a Qualified Public Offering, or (b) upon the
consummation of a Sale of the Operating Company.

                  8.3 SURVIVAL. Anything herein to the contrary notwithstanding,
the covenants and agreements set forth in Section 7.1 through and including
Section 7.4 shall survive the termination of this Agreement pursuant to this
Article VIII.

                                   ARTICLE IX
                                  MISCELLANEOUS

                  9.1 NOTICES. All notices, requests, demands, approvals,
consents, waivers or other communications required or permitted to be given
hereunder (each, a "Notice") shall be in writing, and shall be (a) personally
delivered, (b) sent by facsimile transmission, provided that the original copy
thereof also is sent by pre-paid, first class, registered or certified mail
(return receipt requested) or by next-day or
<PAGE>
overnight mail or courier (to any United States address) or by an
internationally recognized express delivery service (to any foreign address),
(c) sent by pre-paid, first class, registered or certified mail (return receipt
requested) or by next-day or overnight mail or courier (to any United States
address), or (d) delivered by an internationally recognized express delivery
service (to any foreign address), postage and charges prepaid:

                           (i)  if to any Stockholder, at the address set forth
                                on Schedule A; and

                           (ii) if to the Corporation, to:

                                Atrium Companies, Inc.
                                1341 West Mockingbird Lane
                                Suite 1200 West
                                Dallas, TX  75247
                                Attention:  Jeff L. Hull
                                Facsimile:  (214) 630-5058

                                with copies to:

                                Mayer, Brown, Rowe & Maw LLP
                                1675 Broadway
                                New York, New York 10019-5820
                                Attn:  James B. Carlson
                                Fax: 212-262-1910;

or in the case of the Corporation, at such other address and numbers as may have
been furnished in a Notice by the Corporation to the Stockholders; or in the
case of any Stockholder, by such Stockholder to the Corporation and the other
Stockholders. Any Notice shall be deemed effective or given upon receipt (or
refusal of receipt, if properly delivered).

                  9.2 ENTIRE AGREEMENT. This Agreement and other written
agreements among the Stockholders of even date herewith constitute the entire
agreement among the Stockholders relating to the Corporation and supersedes all
prior contracts or agreements with respect to the Corporation, whether oral or
written.

                  9.3 EFFECT OF WAIVER OR CONSENT. A waiver or consent, express
or implied, to or of any breach or default by any Person in the performance by
that Person of its obligations hereunder or with respect to the Corporation is
not a consent or waiver to or of any other breach or default in the performance
by that Person of the same or any other obligations of that Person hereunder or
with respect to the Corporation. Failure on the part of a Person to complain of
any act of any Person or to declare any Person in default hereunder or with
respect to the Corporation, irrespective of how long that failure continues,
does not constitute a waiver by that Person of its rights with respect to that
default until the applicable statute-of-limitations period has run.

                  9.4 AMENDMENT OR MODIFICATION. This Agreement and any
provision hereof may be amended or modified from time to time only by a written
instrument adopted by (a) those Stockholders holding a majority of the
outstanding Shares, (b) for so long as it owns any Shares, Units or Convertible
Securities, the Kenner Group, (c) for so long as it owns any Shares, Units or
<PAGE>

Convertible Securities, the ML Group, and (d) for so long as it owns any Shares,
Units or Convertible Securities, the UBS Group; provided however, that the
Kenner Group together with either one of the ML Group and the UBS Group may
amend this Agreement to the extent necessary to implement any action permitted
by or consented to under Section 5.14 of the LLC Agreement.

                  9.5 BINDING EFFECT. Subject to the restrictions on
Transfers set forth in this Agreement, this Agreement is binding on and shall
inure to the benefit of the Stockholders and their respective heirs, legal
representatives, successors and permitted assigns.

                  9.7 GOVERNING LAW; SEVERABILITY. All issues and questions
concerning the application, construction, validity, interpretation and
enforcement of this Agreement shall be governed by and construed in accordance
with the laws of the state of Delaware, as in effect from time to time, without
giving effect to any choice of law or conflict of law provision or rule (whether
of the State of Delaware or any other jurisdiction) that would cause the
application of the laws of any jurisdiction other than the State of Delaware.

                  9.8 FURTHER ASSURANCES. In connection with this Agreement and
the transactions contemplated hereby, each Stockholder shall execute and deliver
any additional documents and instruments and perform any additional acts that
may be necessary or appropriate to effectuate and perform the provisions of this
Agreement and those transactions.

                  9.9 WAIVER OF CERTAIN RIGHTS. Each Stockholder irrevocably
waives any right it may have to demand any distributions or withdrawal of
property from the Corporation or to maintain any action for dissolution of the
Corporation or for partition of the property of the Corporation.

                  9.10 NOTICE TO STOCKHOLDERS OF PROVISIONS. By executing this
Agreement, each Stockholder acknowledges that it has actual notice of (a) all of
the provisions hereof (including, without limitation, the restrictions on the
transfer set forth in Article V), (b) all of the provisions of the LLC Agreement
(including the restrictions on the transfer set forth in Article IX) and (b) all
of the provisions of the Certificate of Incorporation and by-laws of the
Corporation.

                  9.11 COUNTERPARTS. This Agreement may be executed in multiple
counterparts with the same effect as if all signing parties had signed the same
document. All counterparts shall be construed together and constitute the same
instrument.

                  9.12 CONSENT TO JURISDICTION. Each Stockholder irrevocably
submits to the nonexclusive jurisdiction of the United States District Court
located in the State of New York and the state courts of the State of New York,
sitting in City of New York, Borough of Manhattan, for the purposes of any suit,
action or other proceeding arising out of this Agreement or any transaction
contemplated hereby. Each Stockholder further agrees that service of any
process, summons, notice or document by U.S. certified or registered mail to
such Stockholder's respective address set forth above shall be effective service
of process in any action, suit or proceeding in New York with respect to any
matters to which it has submitted to jurisdiction as set forth above in the
immediately preceding sentence. Each Stockholder irrevocably and

<PAGE>

unconditionally waives any objection to the laying of venue of any action, suit
or proceeding arising out of this Agreement or the transactions contemplated
hereby in the United States District Court located in the State of New York or
the state courts of the State of New York, sitting in City of New York, Borough
of Manhattan, and hereby irrevocably and unconditionally waives and agrees not
to plead or claim in any such court that any such action, suit or proceeding
brought in such court has been brought in an inconvenient forum.

                  9.13 HEADINGS. The headings used in this Agreement are for the
purpose of reference only and will not otherwise affect the meaning or
interpretation of any provision of this Agreement.

                  9.14 REMEDIES. The Corporation and the Stockholders shall be
entitled to enforce their rights under this Agreement specifically, to recover
damages by reason of any breach of any provision of this Agreement (including
costs of enforcement) and to exercise any and all other rights existing in their
favor. The parties hereto agree and acknowledge that money damages may not be an
adequate remedy for any breach of the provision as of this Agreement and that
the Corporation or any Stockholder may in its or his sole discretion apply to
any court of law or equity of competent jurisdiction for specific performance or
injunctive relief (without posting a bond or other security) in order to enforce
or prevent any violation or threatened violation of the provisions of this
Agreement.

                  9.15 SEVERABILITY. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

                  9.16 THIRD-PARTY BENEFICIARIES. This Agreement shall not
confer any rights or remedies upon any person other than the parties hereto and
their respective successors and permitted assigns and, to the extent specified
herein, their respective Affiliates, except that any Person comprising part of
the Kenner Group, the ML Group or the UBS Group, as the case may be, that is not
a party to this Agreement is an express third-party beneficiary of this
Agreement .

                  9.17 CONFIDENTIALITY.

                         (a) By executing this Agreement, each Stockholder
expressly agrees, at all times during the term of this Agreement and thereafter
and whether or not at that time it is a Stockholder of the Corporation, (unless
the prior written consent of the Corporation is obtained, which prior consent
shall not be unreasonably withheld) to maintain the confidentiality of, not to
disclose to any Person other than the Corporation, another Stockholder or a
Person designated by the Corporation, and not to give, sell, use (other than in
connection with Corporation purposes) or otherwise divulge any information
obtained from the Corporation or its representatives; provided, however, that
such Stockholder may disclose and use such information (i) if compelled to
disclose the same by judicial or administrative process or by other requirements
of applicable law or such disclosure is necessary so that such Stockholder not
commit a violation of the rules

<PAGE>

of any securities exchange or is necessary or appropriate in connection with any
legal proceeding, (ii) if such information currently is, or hereafter is, in the
public domain through no fault of such Stockholder or any of its Affiliates,
(iii) if such Information is later acquired by such Stockholder from another
source and such Stockholder is not aware that such source is under an obligation
to another Person to keep such information confidential, or (iv) if such
information is independently developed by such Stockholder without reference
thereto or reliance thereon.

                         (b) Anything to the contrary herein notwithstanding,
each Stockholder may deliver or disclose confidential information to (i) its
stockholders, partners, members, managers, directors, officers, employees,
agents, attorneys and Affiliates (to the extent such disclosure reasonably
relates to the administration of the investment represented by its interest in
the Corporation and such Persons agree to comply with the terms of this
Section), (ii) its financial advisors and other professional advisors who agree
to comply with the terms of this Section, (iii) any Person to which it Transfers
or offers to Transfer its interest in the Corporation or any part thereof or any
participation therein in accordance with the transfer restrictions contained in
this Agreement (if such Person has agreed in writing prior to its receipt of
such confidential information to be bound by the provisions of this Section).

                         (c) Anything in this Agreement or any other express or
implied agreement, arrangement or understanding to the contrary notwithstanding,
each party to this Agreement (and each employee, representative or other agent
of such party) may disclose to any and all persons, without limitation of any
kind, the "tax treatment" and "tax structure" (as those terms are defined in
Treasury Regulation Section 1.6011-4) of the transactions contemplated by this
Agreement and all materials of any kind (including opinions or other tax
analyses) that are provided to such Person relating to such tax treatment and
tax structure. This authorization does not extend to disclosure of any other
information, including (i) the identity of any party (or any representative
thereof), (ii) the existence and status of any negotiations, or (iii) financial,
business, legal or personal information of or regarding a party (or any of its
representatives) to the extent not related to the tax treatment or tax structure
of such transactions.

                                     * * * *

<PAGE>

                  IN WITNESS WHEREOF, the parties have executed or caused this
Agreement to be executed as of the date first written above.

                                        CORPORATION:

                                        ATRIUM CORPORATION

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

<PAGE>

                                        STOCKHOLDERS:

                                        ATR ACQUISITION, LLC

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

<PAGE>

                                        ML IBK Positions, Inc.

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

<PAGE>

                                   SCHEDULE A

<Table>
<Caption>
                                                                                            COMMON             CONVERTIBLE
PARTY                                        NOTICE ADDRESS                                 STOCK              SECURITIES
-----                                        --------------                              ------------          -----------
<S>                                    <C>                                               <C>                   <C>
ATR ACQUISITION, LLC                   c/o Kenner & Company, Inc.                         251,453.721                    0
                                       437 Madison Avenue, 36th Floor                    ============          ===========
                                       New York, New York 10022
                                       Attn: Jeffrey L. Kenner
                                       Fax: 212-758-0406

                                       with a copy to:

                                       Mayer, Brown, Rowe & Maw LLP
                                       1675 Broadway
                                       New York, New York 10019-5820
                                       Attn:  James B. Carlson
                                       Fax: 212-262-1910
ML IBK POSITIONS, INC.                 Global Private Equity Group                         10,646.279                    0
                                       4 World Financial Center, 23rd Floor              ============          ===========
                                       New York, New York 10080
                                       Attn: Nathan C. Thorne
                                       Copy:  Frank Marinaro, Esq.
                                       Fax:  212-449-1119

                                       with a copy to:

                                       Proskauer Rose LLP
                                       1585 Broadway
                                       New York, New York 10036-8299
                                       Attn: James Gerkis, Esq.
                                       Fax: 212-969-2900

TOTAL                                                                                     262,100.000                    0
                                                                                         ============          ===========
</Table>

<PAGE>

                                                                       EXHIBIT A

                                 FORM OF JOINDER
                                       TO
                             STOCKHOLDERS AGREEMENT

         THIS JOINDER to the Stockholders Agreement, dated as of _______, ___,
20__ of , a Delaware corporation (the "Corporation"), by and among certain
Persons named therein (the "Agreement"), is made and entered into as of by and
between the Corporation and ("Holder"). Capitalized terms used herein but not
otherwise defined shall have the meanings set forth in the Agreement.

         WHEREAS, Holder has acquired certain Shares or Convertible Securities
and the Agreement and the Corporation requires Holder, as a holder of Shares or
Convertible Securities, to become bound by and/or a party to the Agreement, and
Holder agrees to do so in accordance with the terms hereof.

         NOW, THEREFORE, in consideration of the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties to this Joinder hereby agree as
follows:

                  1. Agreement to be Bound. Holder hereby agrees that upon
execution of this Joinder, it shall become bound by and/or a party to the
Agreement and shall be fully bound by, and subject to, all of the covenants,
terms and conditions of the Agreement as though an original party thereto. In
addition, Holder hereby agrees that Shares or Convertible Securities held by
Holder shall be deemed Shares or Convertible Securities, as applicable, for the
purposes of being bound thereby and shall have the rights only as provided in
the Agreement. The Corporation hereby agrees that upon such execution of this
Joinder by Holder and the Corporation, Holder shall be deemed a Stockholder of
the Corporation.

                  2. Successors and Assigns. Except as otherwise provided
herein, this Joinder shall bind and inure to the benefit of and be enforceable
by the Stockholders, the Corporation and their successors and assigns and Holder
(only as provided in the Agreement) and any subsequent holders of Shares or
Convertible Securities and the respective successors and permitted assigns of
each of them, so long as they hold any Shares or Convertible Securities.

                  3. Counterparts. This Joinder may be executed in separate
counterparts each of which shall be an original and all of which taken together
shall constitute one and the same agreement.

                  4. Notices. For purposes of Section 9.1 of the Agreement, all
notices, demands or other communications to the Holder shall be directed to:

                                 [Name]
                                 [Address]
                                 [Facsimile Number]

<PAGE>

                  5. Governing Law. All issues and questions concerning the
application, construction, validity, interpretation and enforcement of this
Joinder shall be governed by and construed in accordance with the laws of the
State of Delaware, including the DGCL, as in effect from time to time, without
giving effect to any choice of law or conflict of law provision or rule (whether
of the State of Delaware or any other jurisdiction) that would cause the
application of the laws of any jurisdiction other than the State of Delaware.

                  6. Descriptive Headings. The descriptive headings of this
Joinder are inserted for convenience only and do not constitute a part of this
Joinder.

                                    * * * * *

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Joinder as of
the date first above written.

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

                                             [HOLDER]

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

                                      -1-

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