The Ontario Building Code | Application of Waterproofing Membranes
9.13.3.5. application of Waterproofing Membranes
(1) Concrete or unit masonry walls to be waterproofed shall be covered with no fewer than 2 layers of bitumen-saturated membrane, with each layer cemented in place with bitumen and coated overall with a heavy coating of bitumen.
In Plain Language
Waterproofing membranes must be applied as set out in this article, covering the specific technique needed for a continuous, water-resistant barrier.
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.