MarkhamBuilding InspectionsInspections

Notching and Drilling of Framing Members

Published by City of Markham

This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type: Guide
Published by: City of Markham
Date: January 1, 2025
For: builder
Building types: All building types
Pages: 2

Overview

Issue No. 11 of the City of Markham Building Standards Department's Builder Tips, dated January 1, 2025, updated to the 2024 Ontario Building Code and listed with the City's housing tips. It quotes Articles 9.23.5.1. to 9.23.5.4. on holes drilled in roof, floor and ceiling members, notching of joists near bearing, and the undamaged portion left in wall studs and top plates. The Objective concerns drilling and notching for pipes, cables and other services, with illustrations and a table of the hole and notch sizes and locations.

What it covers

9.23.5.1. Holes Drilled in Framing Members
9.23.5.2. Notching of Framing Members
9.23.5.3. Wall Studs
9.23.5.4. Top Plates
Objective

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