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

9.27.3.6.Face Sealed Cladding (See Note A-9.27.3.6.)

(1) Sheathing membrane is permitted to be omitted beneath cladding when the joints in the cladding are formed to effectively prevent the passage of wind and rain in conformance with Sentence (2) or (3), as applicable. (2) Cladding consisting of sheets of plywood, hardboard, OSB, waferboard or fibre cement is considered to meet the requirements of Sentence (1), provided the cladding is applied so that (a) all edges are directly supported by framing, (b) the vertical joints between adjacent sheets are sealed and (i) covered with battens, (ii) shiplapped, or (iii) otherwise matched to provide weathertight joints, and (c) the horizontal joints between adjacent sheets are sealed and (i) shiplapped, or (ii) otherwise matched to provide weathertight joints. (3) Metal siding consisting of sheets of metal is considered to meet the requirements of Sentence (1) where the joints between sheets are of the locked-seam type.
← Previous9.27.3.5. Sheathing Membranes in Lieu of SheathingNext →9.27.3.7. Flashing Materials

Common questions about this part of the code

Do I need a rainscreen or air gap behind siding in Ontario?How far above the ground does siding have to be in Ontario?What are the code rules for installing vinyl siding in Ontario?

Understand this provision in seconds

BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.

Try BUILDAiD Beta

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.