Code Library › Volume 1 › Section 9.23 — Wood Frame Construction
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.23.5.2.Notching of Framing Members

(1) Floor, roof and ceiling framing members are permitted to be notched provided the notch is located on the top of the member within half the joist depth from the edge of bearing and is not deeper than one-third the joist depth, unless the depth of the member is increased by the size of the notch.
← Previous9.23.5.1. Holes Drilled in Framing MembersNext →9.23.5.3. Wall Studs

Common questions about this part of the code

What stud size and spacing does the Ontario Building Code require for walls?What are the notching and drilling limits for floor joists in Ontario?What are the wall bracing and sheathing requirements for houses in Ontario?

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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.