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

9.27.5.3.Furring

(1) Except as permitted in Sentence 9.27.5.1.(4), furring for the attachment of cladding shall be not less than 19 mm by 38 mm lumber when applied over sheathing. (2) When applied without sheathing, furring referred to in Sentence (1) shall be not less than (a) 19 mm by 64 mm lumber on supports spaced not more than 400 mm o.c., or (b) 19 mm by 89 mm lumber on supports spaced not more than 600 mm o.c. (3) Furring referred to in Sentence (1) shall be (a) securely fastened to the framing, and (b) spaced not more than 600 mm o.c.
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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.