Doman Building Materials Group — Proxy Solicitation & Information Statement 2026

Apr 9, 2026

DOMAN BUILDING MATERIALS GROUP LTD. PROXY

I/We, being holder(s) of common shares of Doman Building Materials Group Ltd. (the “Company”), hereby appoint: Amar S. Doman, Chairman, Chief Executive Officer and Director, or, failing him, Ian Baskerville, Director, OR

To attend the meeting or to appoint someone to attend on your behalf, print that name here

as proxy of the undersigned, to attend, act and vote on behalf of the undersigned in accordance with the below direction (or if no directions have been given, in accordance with the recommendations of management) on all the following matters and any other matter that may properly come before the Annual and Special Meeting of Shareholders of the Company to be held at 1:00 p.m. (Vancouver Time) on Friday, May 8, 2026, at the offices of the Company, located at Suite 1600 – 1100 Melville Street, Vancouver, British Columbia (the “Meeting”), and at any and all re-locations, adjournments or postponements thereof in the same manner, to the same extent and with the same powers as if the undersigned were personally present, with full power of substitution.

This proxy is solicited by and on behalf of Management of the Company.

Management recommends voting FOR ALL Resolutions. Please use a dark black pencil or pen.

1. Number of Directors
   To pass an ordinary resolution fixing the number of directors at eight (8).

FOR			AGAINST
2. Election of Directors	FOR	AGAINST	Election of Directors	FOR	AGAINST
1. AMAR DOMAN	☐	☐	5. MICHELLE HARRISON	☐	☐
2. IAN BASKERVILLE	☐	☐	6. HARRY ROSENFELD	☐	☐
3. SAM FLEISER	☐	☐	7. ANN M. SIMMS	☐	☐
4. MARIE M. GRAUL	☐	☐	8. SIEGFRIED J. THOMA	☐	☐

1. Appointment of Auditors
   Appointment of KPMG LLP as Auditors and authorization of the board of directors to fix the auditor’s remuneration, as specified in the Information Circular.

FOR			WITHHOLD
4. Omnibus Equity Incentive Plan	☐	☐	FOR	AGAINST	☐

TO CONSIDER and, if deemed advisable, to pass, with or without alteration or modification, an ordinary resolution approving the Company’s omnibus equity incentive plan, including approval of the Awards issuable thereunder and the reservation of Common Shares for issuance pursuant to such Awards, as more particularly described in the Information Circular.

Under Canadian Securities Law, you are entitled to receive certain investor documents. If you wish to receive such material, please tick the applicable boxes below. You may also go to our website https://www.tsxtrust.com/InvestorServices/Financial-Statements and input code 1354A.

I would like to receive annual financial statements and MD&A ☐

I/We authorize you to act in accordance with my/our instructions set out above. I/We hereby revoke any proxy previously given with respect to the Meeting.

If no voting instructions are indicated above, this PROXY will be voted in accordance with the recommendations of management. On any amendments or variations proposed or any new business properly submitted before the Meeting, I/We authorize the appointee to vote as they see fit.

Signature(s) _____ Date _______

Please sign exactly as your name(s) appear on this proxy. Please see reverse for instructions. All proxies must be received by 1:00 p.m. (Vancouver Time) Wednesday, May 6, 2026.

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Proxy Form – Annual and Special Meeting of Shareholders of Doman Building Materials Group Ltd. to be held at 1:00 p.m. (Vancouver time) on Friday, May 8, 2026 (the “Meeting”).

Notes to Proxy

1. This proxy must be signed by a holder or his or her attorney duly authorized in writing. If you are an individual, please sign exactly as your name appears on this proxy. If the holder is a corporation, a duly authorized officer or attorney of the corporation must sign this proxy, and if the corporation has a corporate seal, its corporate seal should be affixed.

2. If the securities are registered in the name of an executor, administrator or trustee, please sign exactly as your name appears on this proxy. If the securities are registered in the name of a deceased or other holder, the proxy must be signed by the legal representative with his or her name printed below his or her signature, and evidence of authority to sign on behalf of the deceased or other holder must be attached to this proxy.

3. Some holders may own securities as both a registered and a beneficial holder; in which case you may receive more than one Circular and will need to vote separately as a registered and beneficial holder. Beneficial holders may be forwarded either a form of proxy already signed by the intermediary or a voting instruction form to allow them to direct the voting of securities they beneficially own. Beneficial holders should follow instructions for voting conveyed to them by their intermediaries.

4. If a security is held by two or more individuals, any one of them present or represented by proxy at the Meeting may, in the absence of the other or others, vote at the Meeting. However, if one or more of them are present or represented by proxy, they must vote together the number of securities indicated on the proxy.

All holders should refer to the Proxy Circular for further information regarding completion and use of this proxy and other information pertaining to the Meeting

How to Vote

INTERNET	TELEPHONE
Go to www.meeting-vote.com	Use any touch-tone phone, call toll free in Canada and United States 1-888-489-7352 and follow the voice instructions
Cast your vote online
View Meeting documents
To use using your smartphone, please scan this QR Code

To vote by telephone or Internet you will need your control number. If you vote by Internet or telephone, do not return this proxy.

MAIL, FAX or EMAIL

Complete and return your signed proxy in the envelope provided or send to:

TSX Trust Company
P.O. Box 721
Agncourt, ON M15 0A1

You may alternatively fax your proxy to 416-607-7964 or scan and email to proxyvote@tmx.com.

An undated proxy is deemed to be dated on the day it was received by TSX.

If you wish to receive investor documents electronically in future, please visit services.txtrust.com/edelivery to enrol.

All proxies must be received by 1:00 p.m. (Vancouver time) on Wednesday, May 6, 2026