Doman Building Materials Group — Proxy Solicitation & Information Statement 2022

Apr 9, 2022

DOMAN BUILDING MATERIALS GROUP LTD.

Proxy

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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, Sam Fleiser, Director, OR

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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 Tuesday, May 3, 2022, 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. Election of Directors FOR WITHHOLD Election of Directors FOR WITHHOLD 1. AMAR DOMAN 6. KELVIN DUSHNISKY 2. STEPHEN W. MARSHALL 7. SAM FLEISER 3. MARC SEGUIN 8. MICHELLE HARRISON 4. IAN M. BASKERVILLE 9. HARRY ROSENFELD 5. TOM DONALDSON 10. SIEGFRIED J. THOMA

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

FOR WITHHOLD FOR AGAINST

3. Employee Share Purchase Plan To consider and, if deemed advisable, to approve an ordinary resolution approving an amendment to the Corporation’s employee share purchase plan to increase the maximum number of Common Shares reserved for issuance to employees thereunder, as specified 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 1354.

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) Friday, April 29, 2022.

Control Number

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 Tuesday, May 3, 2022 (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

Go to www.tsxtrust.com/vote-proxy Cast your vote online View Meeting documents

To vote by Internet you will need your control number. If you vote by Internet, 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 Agincourt, ON M1S 0A1

You may alternatively fax your proxy to 416-368-2502 or toll free in Canada and United States to 1-866-7813111 or scan and email to proxyvote@tmx.com.

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

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

All proxies must be received by 1:00 p.m. (Vancouver time) on Friday, April 29, 2022.