The Ontario Building Code | Material Standards
9.13.4.3. Material Standards
(1) Materials used to provide a barrier to soil gas ingress through floors-on-ground shall conform to CAN/cgsb-51.34-M, "Vapour Barrier, Polyethylene Sheet, for Use in building Construction".
Section 9.14. drainage
9.14.1. Scope
In Plain Language
Materials used for soil gas control must conform to the standards referenced in this article, ensuring the barrier or venting system performs reliably.
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.