The Ontario Building Code | Floor Waterproofing System
9.13.3.6. floor waterproofing System
(1) basement floors-on-ground to be waterproofed shall have a system of membrane waterproofing provided between 2 layers of concrete, each of which shall be not less than 75 mm thick, with the floor membrane mopped to the wall membrane to form a complete seal.
9.13.4. soil Gas Control
In Plain Language
A floor waterproofing system, protecting a slab from actual water pressure rather than just dampness, must meet the requirements set out in this article.
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.