Dye & Durham — Regulatory Filings 2021

Feb 19, 2021

Osler, Hoskin & Harcourt LLP Suite 2700, Brookfield Place 225 – 6[th] Avenue S.W. Calgary, Alberta, Canada T2P 1N2 403.260.7000 MAIN 403.260.7024 FACSIMILE

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Calgary

February 18, 2021

Toronto

Montréal

Ottawa

Vancouver

New York

SENT BY SEDAR

• TO: Ontario Securities Commission, as Principal Regulator

AND TO: British Columbia Securities Commission Alberta Securities Commission Financial and Consumer Affairs Authority of Saskatchewan The Manitoba Securities Commission Financial and Consumer Services Commission (New Brunswick) Nova Scotia Securities Commission Office of the Superintendent of Securities, Consumer, Corporate and Insurance Services Division, Office of the Attorney General (Prince Edward Island)

Office of the Superintendent of Securities, Service Newfoundland and Labrador

Office of the Yukon Superintendent of Securities Office of the Superintendent of Securities, Department of Justice (Northwest Territories) Nunavut Securities Office

Dear Sirs and Mesdames:

Offering by Dye & Durham Limited (the “Corporation”)

We refer you to the prospectus supplement dated February 18, 2021 to the short form base shelf prospectus of the Corporation dated November 18, 2020 (collectively, the “ Prospectus ”) relating to the offering of common shares and 3.75% convertible senior unsecured debentures by the Corporation. In the Prospectus, reference is made to this firm on the face page and under the heading “Interests of Experts” and to opinions of this firm under the heading “Eligibility for Investment”. We hereby consent to being named in the Prospectus and to the use of our opinions.

We also confirm that we have read the Prospectus and that we have no reason to believe that there are any misrepresentations as defined in the Securities Act (Ontario) in the information contained in the Prospectus that is: (i) derived from our opinions referred to above, or (ii) within our knowledge as a result of the services we performed to render these opinions.

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Yours very truly,

(signed) “Osler, Hoskin & Harcourt LLP”