OWENS CORNING FIRST SUPPLEMENTAL INDENTURE

Exhibit 4.1

OWENS CORNING

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of April 13, 2007, among CDC Corporation, a Wisconsin corporation; Engineered Pipe Systems, Inc., a Delaware corporation; Eric Company, a Delaware corporation; Falcon Foam Corporation, a Delaware corporation; INTEGREX Ventures, LLC, a Delaware limited liability company; Jefferson Holdings Inc., a Delaware corporation; Modulo USA LLC, a Delaware limited liability company; Norandex Distribution, Inc., a Delaware corporation; OCCV1, Inc., a Delaware corporation; OCCV2, LLC, a Delaware limited liability company; OCCV3, LLC, a Delaware limited liability company; OCCV4, LLC, a Delaware limited liability company; Owens Corning Composite Materials, LLC, a Delaware limited liability company; Owens Corning Construction Services, LLC, a Delaware limited liability company; Owens Corning Cultured Stone, LLC, a Delaware limited liability company; Owens Corning Fabwel, LLC, a Delaware limited liability company; Owens-Corning Fiberglas Technology II, LLC, a Delaware limited liability company; Owens Corning Foam Insulation, LLC, a Delaware limited liability company; Owens Corning Franchising, LLC, a Delaware limited liability company; Owens-Corning Funding Corporation, a Delaware corporation; Owens Corning HOMExperts, Inc., a Delaware corporation; Owens Corning HT, Inc., a Delaware corporation; Owens Corning Insulating Systems, LLC, a Delaware limited liability company; Owens Corning Overseas Holding, Inc., a Delaware corporation; Owens Corning Roofing and Asphalt, LLC, a Delaware limited liability company; Owens Corning Science and Technology, LLC, a Delaware limited liability company; Owens Corning U.S. Holdings, LLC, a Delaware limited liability company; and Palmetto Products, Inc., a Delaware corporation (each a “Guaranteeing Subsidiary”), Owens Corning, a Delaware corporation (the “Company”), the other Guarantors (as defined in the Indenture referred to herein) and LaSalle Bank National Association, as trustee under the Indenture referred to below (the “Trustee”).

W I T N E S S E T H

WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of October 31, 2006 providing for the issuance of 6.50% Senior Notes due 2016 and the 7.00% Senior Notes due 2036 (the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances each Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein (the “Note Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each Guaranteeing Subsidiary and

the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. AGREEMENT TO GUARANTEE. Each Guaranteeing Subsidiary hereby agrees to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Note Guarantee and in the Indenture including but not limited to Article 10 thereof.

4. NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee, incorporator, stockholder or agent of any Guaranteeing Subsidiary, as such, shall have any liability for any obligations of the Company or any Guaranteeing Subsidiary under the Notes, any Note Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the SEC that such a waiver is against public policy.

5. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

6. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

7. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof.

8. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company.

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IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

Dated: April 13, 2007

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