Material Agreement - Form 8-K

As previously disclosed, on April 15, 2024, Masonite International Corporation, a British Columbia corporation ("Masonite"), and Owens Corning, a Delaware corporation ("Owens Corning"), jointly issued a press release to announce, in connection with the anticipated acquisition of Masonite by Owens Corning, (i) the commencement of an offer (the "Offer to Purchase") by Owens Corning to purchase for cash any and all of Masonite's 5.375% Senior Notes due 2028 (the "2028 Notes"), issued pursuant to that certain Indenture, dated as of July 25, 2019 (the "Base Indenture" and, as amended, supplemented or otherwise modified prior to the Supplemental Indenture defined below, the "Indenture"), among Masonite, the guarantors party thereto (the "Guarantors") and Computershare Trust Company, N.A., as trustee (the "Trustee"), and (ii) a related consent solicitation by Masonite soliciting consents of holders of the 2028 Notes to adopt certain proposed amendments (the "Proposed Amendments") to the Indenture to eliminate certain covenants, restrictive provisions and events of default from the Base Indenture (the "Consent Solicitation"). The Offer to Purchase and Consent Solicitation were each made to holders pursuant to the terms of and subject to the conditions set forth in the offer to purchase and consent solicitation statement dated April 15, 2024 (the "Statement").

As of 5:00 p.m., New York City time, on April 26, 2024, $441,351,000 of the 2028 Notes, or approximately 88.27% of the outstanding principal amount thereof, were tendered and not validly withdrawn, and the related consents were delivered and not validly revoked, which amount was sufficient to constitute the requisite consents under the Indenture to approve the Proposed Amendments. On April 29, 2024, Masonite, the Guarantors and the Trustee accordingly entered into the Fourth Supplemental Indenture to the Indenture (the "Supplemental Indenture") in order to adopt the Proposed Amendments.

The Supplemental Indenture became effective upon execution. However, the Proposed Amendments will not become operative unless and until all conditions to the Consent Solicitation set forth in the Statement have been satisfied or waived, as applicable, including, among other conditions, (i) that the 2028 Notes that are validly tendered (and not validly withdrawn) have been accepted for purchase and paid for by Owens Corning in accordance with the terms of the Offer to Purchase and the Consent Solicitation set forth in the Statement and (ii) the consummation of the anticipated acquisition of Masonite by Owens Corning. As a result, the Proposed Amendments will have no force or effect unless and until all conditions set forth in the Statement have been satisfied or waived, as applicable, and all terms and conditions as set forth in the Indenture immediately prior to the execution of the Supplemental Indenture will continue to govern.

The foregoing description of the Supplemental Indenture does not purport to be complete and is qualified in its entirety by reference to the Supplemental Indenture, a copy of which is filed as Exhibit 4.1 to this Current Report on Form 8-Kand incorporated into this Item 1.01 by reference.

This Form 8-Kis not intended to and does not constitute an offer to sell or purchase, or the solicitation of an offer to sell or purchase, or the solicitation of any vote of approval or the solicitation of tenders or consents with respect to any security. No offer, solicitation, purchase or sale will be made in any jurisdiction in which such an offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.