The Ontario Building Code | Material Standards
9.13.2.2. Material Standards
(1) Except as otherwise specified in this Section, materials used for exterior dampproofing shall conform to,
(a) CAN/CGSB-37.1-M, "Chemical Emulsified Type, Emulsified Asphalt for Dampproofing",
(b) CAN/CGSB-37.2-M, "Emulsified Asphalt, Mineral Colloid Type, Unfilled, for Dampproofing and Waterproofing and for Roof Coatings",
(c) CGSB 37-GP-6Ma, "Asphalt, Cutback, Unfilled, for Dampproofing",
(d) CAN/CGSB-37.16-M, "Filled, Cutback Asphalt for Dampproofing and Waterproofing",
(e) CGSB 37-GP-18Ma, "Tar, Cutback, Unfilled, for Dampproofing",
(f) CAN/CGSB-51.34-M, "Vapour Barrier, Polyethylene Sheet, for Use in Building Construction",
(g) CAN/CSA-A123.4, "Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems," or
(h) CGSB 37-GP-56M, "Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing".
In Plain Language
Dampproofing materials must conform to the standards referenced in this article, ensuring consistent performance across different products used for this purpose.
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.