Mr. Ali Mahdavi reports

DOMAN BUILDING MATERIALS GROUP LTD. ANNOUNCES CLOSING OF ADDITIONAL $170 MILLION SENIOR UNSECURED NOTE OFFERING AND REDEMPTION OF ITS REMAINING 5.25% SENIOR UNSECURED NOTES DUE MAY 15, 2026

Doman Building Materials Group Ltd. has closed its previously announced private placement offering of $170-million aggregate principal amount of 7.50 per cent senior unsecured notes due Sept. 17, 2029. Stifel, CIBC Capital Markets and TD Securities acted as joint active bookrunners, and National Bank Capital Markets, Raymond James, RBC Capital Markets, Wells Fargo Securities, Canaccord Genuity and Desjardins Capital Markets acted as joint bookrunners on the note offering.

The notes have identical terms and will be fungible (following the expiry of the applicable statutory hold period) with and are a part of a single series with the $365-million aggregate principal amount of 7.50 per cent senior unsecured notes due 2029 currently outstanding. The notes were issued at a price of $1,016.25 per $1,000 principal amount plus the amount of accrued interest on the principal amount from Sept. 17, 2025, to but excluding the date hereof.

The notes were offered for sale in each of the provinces of Canada to accredited investors on a private placement basis in accordance with Canadian securities laws. The notes have not been and will not be qualified for distribution in Canada by a prospectus and were offered and sold in Canada only pursuant to an exemption from the prospectus requirements of Canadian securities laws. In addition, the notes have not been and will not be registered under the U.S. Securities Act of 1933, as amended, and were sold to certain non-U.S. persons in transactions outside the United States in reliance on Regulation S under the U.S. Securities Act. This press release shall not constitute an offer to sell or the solicitation of an offer to buy any securities in Canada, the United States or any other jurisdiction.

As previously announced, Doman intends to use the net proceeds of approximately $167-million, together with additional funds drawn under its syndicated credit facility, to redeem all of its outstanding 5.25 per cent senior unsecured notes due May 15, 2026. Formal notice of the redemption, which is expected to be completed on Dec. 17, 2025, is being delivered today to Computershare Advantage Trust of Canada, as trustee, in accordance with the terms of the trust indenture for the 2026 notes. The aggregate principal amount of 2026 notes outstanding as of the date hereof is $272,163,000.

About Doman Building Materials Group Ltd.

Founded in 1989, Doman is headquartered in Vancouver, B.C., and trades on the Toronto Stock Exchange under the symbol DBM.

As Canada's only fully integrated national distributor in the building materials and related products sector, Doman operates several distinct divisions with multiple treating plants, planing and specialty facilities and distribution centres coast-to-coast in all major cities across Canada and coast-to-coast across the United States.

Strategically located across Canada, Doman Building Materials Canada operates distribution centres coast-to-coast, and Doman Treated Wood Canada operates multiple treating plants near major cities. In the United States: Headquartered in Dallas, Tex., Doman Lumber operates 21 treating plants, two specialty planing mills and five specialty sawmills located in nine states, distributing, producing and treating lumber, fencing and building material servicing the central United States; Doman Tucker Lumber operates three treating plants, specialty sawmilling operations and a captive trucking fleet serving the U.S. East Coast; Doman Building Materials USA and Doman Treated Wood USA serve the U.S. West Coast with multiple locations in California and Oregon; and, in the state of Hawaii, the Honsador Building Products Group services 15 locations across all the islands.

We seek Safe Harbor.