Code Library › Volume 1 › Section 9.26 — Roofing
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.26.6.1.Materials

(1) Except as required in Sentence (2), when underlay is used beneath shingles, it shall be (a) asphalt-saturated sheathing paper weighing not less than 0.195 kg/m², or (b) No. 15 plain or perforated asphalt-saturated felt. (See Note A-9.26.6.1.(1)) (2) Underlay used beneath wood shingles shall be breather type.
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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.