Doman Building Materials Group — Proxy Solicitation & Information Statement 2026

Apr 9, 2026

DOMAN BUILDING MATERIALS GROUP LTD.

NOTICE OF ANNUAL AND SPECIAL MEETING OF SHAREHOLDERS

NOTICE IS HEREBY GIVEN that the annual and special meeting (the "Meeting") of holders (the "Shareholders") of common shares ("Common Shares") of Doman Building Materials Group Ltd. (the "Corporation") will be held at the offices of the Corporation, located at Suite 1600 – 1100 Melville Street, Vancouver, British Columbia on Thursday, the 8th day of May, 2026, at 1:00 p.m. (Vancouver time).

Shareholders are urged to vote on the matters before the Meeting by proxy. Shareholders may listen to the Meeting by live audio teleconference by dialing 1-877-407-3982 (toll free within North America) starting at 1:00 p.m. (Vancouver time) on May 8, 2026. Shareholders will not be entitled to vote at, or otherwise participate in, the Meeting by way of teleconference, or electronic means other than as may be described herein.

The Meeting will be held for the following purposes:

1. TO RECEIVE the financial statements of the Corporation for the year ended December 31, 2025, together with the report of the auditors thereon;
2. TO FIX the number of directors of the Corporation and TO ELECT directors for the ensuing year;
3. TO APPROVE the omnibus equity incentive plan (the "Omnibus Plan") in the form attached as Appendix "B" to the management information circular of the Corporation dated March 31, 2026;
4. TO APPOINT auditors of the Corporation and authorize the directors to fix their remuneration; and
5. TO TRANSACT such other business as may properly come before the Meeting or any postponement or adjournment thereof.

As a holder of Common Shares, you are entitled to cast one vote for each Common Share that you own. If you are a registered Shareholder ("Registered Shareholder") you will be able to vote on the items of business set out above by completing a form of proxy, included with the Information Circular. To be valid, registered Shareholders must submit the form of proxy not later than 1:00 p.m. (Vancouver time) on May 6, 2026 or, if the Meeting is adjourned or postponed, not later than 48 hours (excluding Saturdays, Sundays and statutory holidays) preceding the time for any reconvened meeting, at the offices of TSX Trust Company, P.O. Box 721, Agincourt, ON M1S 0A1, or fax it to TSX Trust Company, Attention: Proxy Department at 416-607-7964.

If you are a non-registered beneficial Shareholder, you must follow the instructions provided by your broker, securities dealer, bank, trust company or similar entity in order to vote your Common Shares.

All Shareholders are strongly encouraged to vote prior to the Meeting by any of the means described on pages 7 to 9 of the Management Information Circular.

The accompanying Management Information Circular provides additional information relating to the matters to be dealt with at the Meeting and forms part of this notice.

DATED at Vancouver, British Columbia this 31st day of March, 2026.

BY ORDER OF THE BOARD OF DIRECTORS
OF DOMAN BUILDING MATERIALS GROUP LTD.

"Amar S. Doman"
Chair of the Board of Directors
Doman Building Materials Group Ltd.