MarkhamBuilding InspectionsInspections

Lateral Support of Foundation Walls

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

Builder Tip Issue No. 22 from the City of Markham Building Standards Department, dated January 1, 2025 and updated to the 2024 Ontario Building Code, on bracing foundation walls before backfilling; filed with the City's housing tips. It quotes Article 9.12.3.4., Article 9.15.4.2. on wall thickness and Table 9.15.4.2.-A, and Article 9.15.4.3. on when a wall counts as laterally supported at the top. The Objective's example: a 203 mm, 15 MPa concrete wall backfilled to 1200 mm without lateral support, and braced or supported by the floor system beyond that.

What it covers

9.12.3.4. Lateral Support of Foundation Wall
9.15.4.2. Foundation Wall Thickness and Required Lateral Support
9.15.4.3. Foundation Walls Considered to be Laterally Supported at the Top
Objective

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