The Ontario Building Code | Soil Gas Control
9.13.4.1. Soil Gas Control
(1) Where methane or radon gases are known to be a problem, construction shall comply with the requirements for soil gas control in MMAH Supplementary Standard SB-9, "Requirements for Soil Gas Control".
In Plain Language
Soil gas control, addressing gases like radon that can enter a building from the ground, is covered generally in this article as an introduction to the requirements that follow.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.