Construction codes of Ontario

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Size of Chimney Flues

Size of Chimney Flues (1) Except for chimneys serving fireplaces, the size of a chimney flue shall conform to the requirements of the solid fuel-burning appliance installation standard referenced in Sentence 6.2.1.4.(1) and Article 9.33.1.2. (2) Where a chimney flue serves only one solid fuel-burning appliance, the flue area shall be at least equal to that of […]

Slope of Smoke Chamber

Slope of Smoke Chamber (1) The sides of the smoke chamber connecting a fireplace throat with a flue shall not be sloped at an angle greater than 45° to the vertical. Article 9.22.7.1 Ontario Regulation 332/12 Building Code, O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021

Smoke Alarms

(0.1) Except as provided in Article 3.2.4.22A., smoke alarms shall be installed in accordance with this Article. (1) Except as permitted by Sentence (6), smoke alarms conforming to CAN/ULC-S531, “Smoke Alarms”, shall be installed in each dwelling unit and, except for care, care and treatment or detention occupancies required to have a fire alarm system, in […]

Spaces Between Liners and Surrounding Masonry

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. (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.

Steel Liners

Steel Liners (1) Steel liners for fireplaces shall conform to CAN/ULC-S639M, “Steel Liner Assemblies for Solid-Fuel Burning Masonry Fireplaces”, and shall be installed in accordance with the installation instructions in that standard. Article 9.22.2.3. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Stepped Flashing

Stepped Flashing Flashing must be provided at the junction between a roof and a masonry wall or chimney. The base flashing should extend at least 150 mm (6 in.) up the side of the chimney or masonry veneer. A common approach is to bend the top of the base flashing and imbed it at least […]

Support of Hearth

Support of Hearth (1) Except as permitted in Sentence (2), the fire chamber floor and hearth shall be supported on a reinforced concrete slab not less than a 100 mm thick at its supports and, if cantilevered, not less than 50 mm thick at its unsupported edge. (2) A hearth for a fireplace with an opening raised […]