EXECUTION COPY FOURTH AMENDMENT AND WAIVER, dated as of January 31, 2000 (this "Amendment and Waiver") to the Credit Agreement, dated as of January 28, 1998, (as the same may be amended, supplemented or otherwise modified from time to time, the "Credit Agreement") among RELIANT BUILDING PRODUCTS, INC., a Delaware corporation (the "Borrower"), the several banks and other financial institutions or entities from time to time parties to the Credit Agreement (the "Lenders"), CHASE SECURITIES INC., as advisor and arranger (in such capacity, the "Arranger"), CANADIAN IMPERIAL BANK OF COMMERCE, NEW YORK AGENCY, as documentation agent (in such capacity, the "Documentation Agent"), and CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, as administrative agent (in such capacity, the "Administrative Agent"). W I T N E S S E T H : WHEREAS, the Borrower and Lenders are parties to the Credit Agreement; and WHEREAS, the Borrower requests that the Lenders waive compliance with certain financial covenants contained in the Credit Agreement; and WHEREAS, the Borrower has requested that the Lenders amend the Credit Agreement as set forth herein; and WHEREAS, the Lenders are willing to agree to the requested amendment and waivers, but only upon the terms and conditions contained herein; NOW THEREFORE, in consideration of the premises contained herein, the parties hereto agree as follows: I. Defined Terms. Terms defined in the Credit Agreement and used herein shall have the meanings given to them in the Credit Agreement. Unless otherwise indicated, all Section and subsection references are to the Credit Agreement. II. Waivers to the Credit Agreement 1. Section 7.1(a) (Consolidated Leverage Ratio). The Lenders hereby waive, for the period from February 1, 2000 to and including February 14, 2000 only, any Default or Event of Default occurring solely because the Borrower exceeds the maximum Consolidated Leverage Ratio as at the end of the second fiscal quarter of Fiscal Year 2000 and thereafter (including as at the end of the third fiscal quarter of Fiscal Year 2000 and thereafter) to and including February 14, 2000; provided, however, that such waiver shall only be effective for so long as no interest is paid on or after the date hereof by the Borrower in respect of the Senior Subordinated Notes. 2. Section 7.1(b) (Consolidated Interest Coverage Ratio). The Lenders hereby waive, for the period from February 1, 2000 to and including February 14, 2000 only, any Default or Event of Default occurring solely because the Borrower does not meet the minimum Consolidated Interest Coverage Ratio for the period of four consecutive fiscal quarters ended with the second fiscal quarter of Fiscal Year 2000 and for the period of four consecutive fiscal quarters ended with the third fiscal quarter of Fiscal Year 2000; provided, however, that such waiver shall only be effective for so long as no interest is paid on or after the date hereof by the Borrower in respect of the Senior Subordinated Notes. 3. Section 7.1(c) (Maintenance of Minimum EBITDA). The Lenders hereby waive, for the period from February 1, 2000 to and including February 14, 2000 only, any Default or Event of Default occurring solely because the Borrower does not meet the minimum Consolidated EBITDA for the period of four consecutive fiscal quarters ended with the second fiscal quarter of Fiscal Year 2000 and for the period of four consecutive fiscal quarters ended with the third fiscal quarter of Fiscal Year 2000; provided, however, that such waiver shall only be effective for so long as no interest is paid on or after the date hereof by the Borrower in respect of the Senior Subordinated Notes. 4. Nonpayment of Interest on Senior Subordinated Notes. The Lenders hereby waive, for the period from February 1, 2000 to and including February 14, 2000 only, any Default or Event of Default occurring solely due to the nonpayment of interest by the Borrower with respect to the Senior Subordinated Notes. III. Amendment of Subsection 5.2(a) (Representations and Warranties). Subsection 5.2(a) of the Credit Agreement is hereby amended by inserting the words "Except as disclosed to the Lenders in the information memorandum dated January 10, 2000," at the beginning of such subsection. IV. General Provisions 1. Representations and Warranties. On and as of the date hereof and after giving effect to this Amendment and Waiver, except as disclosed to the Lenders in the information memorandum dated January 10, 2000, the Borrower hereby confirms, reaffirms and restates the representations and warranties set forth in Section 4 of the Credit Agreement mutatis mutandis, and to the extent that such representations and warranties expressly relate to a specific earlier date in which case the Borrower hereby confirms, reaffirms and restates such representations and warranties as of such earlier date, provided that the references to the Credit Agreement in such representations and warranties shall be deemed to refer to the Credit Agreement as amended prior to the date hereof and pursuant to this Amendment and Waiver. 2. Conditions to Effectiveness. This Amendment and Waiver shall become effective as of the date hereof upon receipt by the Administrative Agent of (a) counterparts of this Amendment and Waiver, duly executed and delivered by the Borrower and the Required Lenders and (b) counterparts of the Acknowledgment and Consent hereto, duly executed and delivered by Keystone, Inc. and each Guarantor under the Guarantee and Collateral Agreement. 3. Continuing Effect; No Other Amendments. Except as expressly amended or waived hereby, all of the terms and provisions of the Credit Agreement are and shall remain in full force and effect. The waivers provided for herein are limited to the specific subsections of the Credit Agreement specified herein and shall not constitute an amendment or waiver of, or an indication of the Lenders' willingness to amend or waive, any other provisions of the Credit Agreement or the same subsections for any other date or time period (whether or not such other provisions or compliance with such subsections for another date or time period are affected by the circumstances addressed in this Amendment and Waiver). 4. Expenses. The Borrower agrees to pay and reimburse the Administrative Agent for all its reasonable costs and expenses incurred in connection with the preparation and delivery of this Amendment and Waiver, including, without limitation, the reasonable fees and disbursements of counsel to the Administrative Agent. 5. Counterparts. This Amendment and Waiver may be executed by one or more of the parties to this Amendment and Waiver on any number of separate counterparts (including by telecopy), and all of said counterparts taken together shall be deemed to constitute one and the same instrument. 6. GOVERNING LAW. THIS AMENDMENT AND WAIVER AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT AND WAIVER SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS THEREOF. RELIANT BUILDING PRODUCTS, INC. By: /s/ William K. Snyder Name: William K. Snyder Title: CFO & Sr. V.P. CHASE BANK OF TEXAS, NATIONAL ASSOCIATION, as Administrative Agent, Swing Line Lender, Issuing Lender and as a Lender By: /s/ B.B. Wuthrich Name: B.B. Wuthrich Title: Vice President BANKBOSTON, N.A. By: Name: Title: BALANCED HIGH YIELD FUND I BY BHF (USA) Capital Corporation acting as Attorney-in-fact By: Name: Title: By: Name: Title: PARIBAS By: /s/ Larry Robinson Name: Larry Robinson Title: Vice President By: /s/ Scott Clingan Name: Scott Clingan Title: Director ING HIGH INCOME PRINCIPAL PRESERVATION FUND HOLDINGS, LDC By: ING Capital Advisors, LLC as Investment Advisor By: /s/ Kurt Wegleitner Name: Kurt Wegleitner Title: Vice President NORTHERN LIFE INSURANCE COMPANY By: ING Capital Advisors, LLC as Investment Advisor By: /s/ Kurt Wegleitner Name: Kurt Wegleitner Title: Vice President BHF (USA) CAPITAL CORPORATION By: Name: Title: By: Name: Title: CIBC, INC. By: /s/ Ihor Zaluckyj Name: Ihor Zaluckyj Title: Executive Director FLEET BUSINESS CREDIT CORPORATION By: /s/ H. Michael Wills Name: H. Michael Wills Title: Authorized Officer KEY CORPORATE CAPITAL INC. By: /s/ Alan J. Ronan Name: Alan J. Ronan Title: Designated Signer KZH CYPRESSTREE-1 LLC By: /s/ Peter Chin Name: Peter Chin Title: Authorized Agent SENIOR DEBT PORTFOLIO By: Boston Management and Research as Investment Advisor By: /s/ Scott H. Page Name: Scott H. Page Title: Vice President VAN KAMPEN CLO II, LIMITED By: VAN KAMPEN MANAGEMENT INC., as Collateral Manager By: /s/ Darvin D. Pierce Name: Darvin D. Pierce Title: Vice President VAN KAMPEN PRIME RATE INCOME TRUST By: Van Kampen Investment Advisory Corp. By: /s/ Darvin D. Pierce Name: Darvin D. Pierce Title: Vice President ACKNOWLEDGMENT AND CONSENT Each of the undersigned hereby consents to the foregoing Consent and Waiver and hereby confirms, reaffirms and restates that its obligations under or in respect of the Credit Agreement and the documents related thereto to which it is a party are and shall remain in full force and effect after giving effect to the foregoing Amendment: RBPI HOLDING CORPORATION By: /s/ William K. Snyder Title: V.P. RELIANT BUILDING PRODUCTS, INC. By: /s/ William K. Snyder Title: CFO & Sr. V.P. RBP OF ARIZONA, INC. By: /s/ William K. Snyder Title: V.P. RBP CUSTOM GLASS, INC. By: /s/ William K. Snyder Title: V.P. RBP OF TEXAS, INC. By: /s/ William K. Snyder Title: V.P. RBP TRANS, INC. By: /s/ William K. Snyder Title: V.P. LEVAN BUILDIERS SUPPLY, INCORPORATED By: /s/ William K. Snyder Title: V.P. TIMBER TECH, INC. By: /s/ William K. Snyder Title: V.P. CFA HOLDING COMPANY By: /s/ William K. Snyder Title: V.P. CARE FREE ALUMINUM PRODUCTS, INC. By: /s/ William K. Snyder Title: V.P. ULTRA BUILDING SYSTEMS, INC. By: /s/ William K. Snyder Title: V.P. ALPINE INDUSTRIES, INC. By: /s/ William K. Snyder Title: V.P. KEYSTONE, INC. By: Title: