INTELLECTUAL PROPERTY SECURITY AGREEMENT

EXECUTION VERSION

INTELLECTUAL PROPERTY SECURITY AGREEMENT

This INTELLECTUAL PROPERTY SECURITY AGREEMENT (as amended, amended and restated, supplemented or otherwise modified from time to time, the “ IP Security Agreement ”) dated June 9, 2008, is made by Ply Gem Industries, Inc., a Delaware corporation (the “ Specified U.S. Borrower ”), Ply Gem Holdings, Inc., a Delaware Corporation (“ Holdings ”) and the Subsidiaries of the Specified U.S. Borrower listed on the Annex hereto (the “ Subsidiaries ”, and together with the Specified U.S. Borrower and Holdings, the “ Grantors ”) in favor of General Electric Capital Corporation, as collateral agent (the “ Collateral Agent ”) for the Secured Parties (as defined in the Credit Agreement referred to below).

WHEREAS, The Specified U.S. Borrower and the other Loan Parties party thereto have entered into a Credit Agreement dated as of June 9, 2008 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “ Credit Agreement ”), with Credit Suisse, as Administrative Agent, and the Lenders party thereto.  Terms defined in the Credit Agreement and not otherwise defined herein are used herein as defined in the Credit Agreement.

WHEREAS, as a condition precedent to the making of Loans and the issuance of Letters of Credit by the Lender Parties under the Credit Agreement and the entry into Secured Hedge Agreements by the Hedge Banks and the entry into Secured Cash Management Agreements by the Cash Management Banks from time to time, each Grantor has executed and delivered that certain Security Agreement dated June 9, 2008, made by the Grantors to the Collateral Agent (as amended, amended and restated, supplemented or otherwise modified from time to time, the “ Security Agreement ”).

WHEREAS, under the terms of the Security Agreement, the Grantors have granted to the Administrative Agent, for the ratable benefit of the Secured Parties, a security interest in, among other property, certain intellectual property of the Grantors, and have agreed as a condition thereof to execute this IP Security Agreement for recording with the U.S. Patent and Trademark Office, the United States Copyright Office, the Canadian Intellectual Property Office and other governmental authorities.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, each Grantor agrees as follows:

SECTION 1.   Grant of Security .  Each Grantor hereby grants to the Administrative Agent for the ratable benefit of the Secured Parties a security interest in all of such Grantor’s right, title and interest in and to the following (the “ Collateral ”):

SECTION 2.   Security for Obligations .  The grant of a security interest in, the Collateral by each Grantor under this IP Security Agreement secures the payment of all Secured Obligations of such Grantor now or hereafter existing under or in respect of the Loan Documents.  Without limiting the generality of the foregoing, this IP Security Agreement secures, as to each Grantor, the payment of all amounts that constitute part of the Secured Obligations and that would be owed by such Grantor to any Secured Party under the Loan Documents but for the fact that such Secured Obligations are unenforceable or not allowable due to the existence of a bankruptcy, reorganization or similar proceeding involving a Loan Party.

SECTION 3.   Recordation .  Each Grantor authorizes and requests that the Register of Copyrights, the Commissioner for Patents and the Commissioner for Trademarks and any other applicable government officer record this IP Security Agreement.

SECTION 4.   Execution in Counterparts .  This IP Security Agreement may be executed in any number of counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement.

SECTION 5.   Grants, Rights and Remedies .  This IP Security Agreement has been entered into in conjunction with the provisions of the Security Agreement.  Each Grantor does hereby acknowledge and confirm that the grant of the security interest hereunder to, and the rights and remedies of, the Administrative Agent with respect to the Collateral are more fully set forth in the Security Agreement, the terms and provisions of which are incorporated herein by reference as if fully set forth herein.

SECTION 6.   Governing Law .  This IP Security Agreement shall be governed by, and construed in accordance with, the laws of the State of New York.

Reference is made to the Lien Subordination and Intercreditor Agreement dated as of June 9, 2008, among General Electric Capital Corporation, as Collateral Agent for the Revolving Facility Secured Parties referred to therein, U.S. Bank National Association, as Trustee and as Noteholder Collateral Agent, Ply Gem Holdings, Inc., Ply Gem Industries, Inc. and the subsidiaries of Ply Gem Industries, Inc. named therein (the “Intercreditor Agreement”).  Notwithstanding any other provision contained herein, this Agreement, the Liens created hereby and the rights, remedies, duties and obligations provided for herein are subject in all respects to the provisions of the Intercreditor Agreement and, to the extent provided therein, the applicable Senior Secured Obligations Security Documents (as defined in the Intercreditor Agreement).  In the event of any conflict or inconsistency between the provisions of this Agreement and the Intercreditor Agreement, the provisions of the Intercreditor Agreement shall control.

[Remainder of Page Intentionally Blank]

Schedule I

Schedule A to IP Intellectual Property

(Patents)

GREAT LAKES WINDOW, INC.

KROY BUILDING PRODUCTS, INC.

Doc#: US1:5236231v6

VARIFORM, INC.

ALCOA HOME EXTERIORS, INC.

MW MANUFACTURERS, INC.

NAPCO, INC.

Schedu