MarkhamBuilding InspectionsInspections

Moisture Barrier on 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

Markham's Builder Tip Issue No. 2, dated January 1, 2025 and updated to the 2024 Ontario Building Code, one of the City Building Standards Department's tips for housing permits. It quotes Article 9.13.2.5., Moisture Protection for Interior Finishes, on protecting the interior face of below-grade foundation walls behind insulation, finishes or wood framing, and the limits on membranes and coatings above ground level. The Objective adds advice on concrete curing time and building paper as a moisture barrier, left off the wall above grade so it can breathe.

What it covers

9.13.2.5. Moisture Protection for Interior Finishes
Objective

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