PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.19.1.3.Clearances
(1) Except as provided in Sentence (2), where venting is provided to a roof joist space, not less than 63 mm of space
shall be provided between the top of the insulation and the underside of the roof sheathing.
(2) Where venting is provided at the junction of sloped roofs and exterior walls and where preformed baffles are used to
contain the insulation, the baffles shall
(a) provide an unobstructed air space, between the insulation and the underside of the roof sheathing, that is
(i) not less than 25 mm in dimension, and
(ii) of sufficient cross area to meet the attic or roof space venting requirements of Article 9.19.1.2., and
(b) extend vertically not less than 50 mm above the top of the insulation.
(3) Ceiling insulation shall be installed in a manner that will not restrict the free flow of air through roof vents or
through any portion of the attic or roof space.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.