MarkhamBuilding InspectionsInspections

Waterproof Wall Finishes Around Bathtubs

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
Also called: Waterproof Wall Finish Around Bathtubs
For: builder
Building types: All building types
Pages: 2

Overview

Markham's Builder Tip Issue No. 8, dated January 1, 2025 and updated to the 2024 Ontario Building Code, on the waterproof finish around showers and bathtubs, one of the City's housing tips. It quotes Subsection 9.29.2., with its heights (1.8 m in shower stalls, 1.2 m above tubs with showers, 400 mm above tubs without) and the listed tile, vinyl, hardboard and laminate materials, and Article 9.29.10.4. on moisture-resistant backing. The Objective and an illustration show tile over water-resistant gypsum board around a tub without a shower.

What it covers

9.29.2. Waterproof Wall Finish
9.29.2.1. Where Required
9.29.2.2. Materials
9.29.10.4 Moisture Resistant Backing
Objective

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