Spaces Between Liners and Surrounding Masonry

(1)  A space not less than 10 mm wide shall be left between a chimney liner and the surrounding masonry.

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(2)  The space required in Sentence (1) shall not be filled with mortar.

Article 9.21.3.8. Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.