Code Library › Volume 1 › Section 9.27 — Cladding
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.27.6.3.Joints

(1) Lumber siding shall prevent water from entering at the joints by the use of lapped or matched joints or by vertical wood battens. (2) Siding shall overlap not less than 1 mm per 16 mm width of lumber, but not less than (a) 9.5 mm for matched siding, (b) 25 mm for lapped bevel siding, or (c) 12 mm for vertical battens.
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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.