Clearance from Combustible Materials
(1) The clearance between masonry or concrete chimneys and combustible framing material shall be not less than,
(a) 50 mm for interior chimneys, and
(b) 12 mm for exterior chimneys.
(2) A clearance of not less than 150 mm shall be provided between a cleanout opening and combustible material.
(3) Combustible flooring, subflooring and ceiling finishes shall have not less than a 12 mm clearance from masonry or concrete chimneys.
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Article 9.21.5.1. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
