Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Material Standards

9.13.3.2. Material Standards

(1) Except as otherwise specified in this Section, materials used for exterior waterproofing shall conform to,

(a) CAN/cgsb-37.2-M, "Emulsified asphalt, Mineral-Colloid Type, Unfilled, for Dampproofing and waterproofing and for Roof Coatings",

(b) CAN/cgsb-37.16-M, "Filled, Cutback asphalt for Dampproofing and waterproofing",

(c) CAN/CSA-A123.4, "asphalt for Constructing Built-Up Roof Coverings and waterproofing Systems", or

(d) cgsb 37-GP-56M, "Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing".

In Plain Language

Waterproofing materials must conform to the standards referenced in this article, ensuring the product can withstand sustained water pressure.

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.