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
- Soil Gas
- For
- builder
- Building types
- All building types
- Pages
- 5
- Instruments
- MMAH Supplementary Standard SB-9, Requirements for Soil Gas Control · CAN/CGSB-51.34-M, Vapour Barrier, Polyethylene Sheet, for Use in Building Construction
Overview
The City of Markham's five-page Builder Tip No. 109, dated January 1, 2025, linked as Soil Gas and listed last among the City's housing tips under the 2024 Ontario Building Code. It quotes Article 9.1.1.7. on radon in three designated areas and Subsection 9.13.4. on soil gas control, protection from ingress under SB-9, polyethylene to CAN/CGSB-51.34-M and the rough-in for a subfloor depressurization system. Its objectives note harmonization with the 2020 NBC and the 200 Bq/m3 federal guideline, with a photo and diagrams from a Buildings Branch presentation.
What it covers
- 9.1.1.7. Radon
- 9.13.4. Soil Gas Control
- 9.13.4.1. Application and Scope
- 9.13.4.2. Protection from Soil Gas Ingress
- 9.13.4.3. Providing for the Rough-in for a Subfloor Depressurization System
- Objectives
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