PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.13.3.2.Waterproofing Materials
(1) Materials installed to provide required waterproofing shall be
(a) compatible with adjoining materials, and
(b) resistant to mechanisms of deterioration that may reasonably be expected, given the nature, function and exposure of
the materials.
(2) Materials used for exterior waterproofing shall conform to
(a) ASTM D1227 / D1227M, “Standard Specification for Emulsified Asphalt Used as a Protective Coating for
Roofing,” in which case, they shall be installed in accordance with Sentence 9.13.3.3.(3),
(b) ASTM D3019 / D3019M, “Standard Specification for Lap Cement Used with Asphalt Roll Roofing, Non-Fibered,
and Fibered,” where non-fibered and non-asbestos-fibered (Types I and III) asphalt roll roofing are permitted,
(c) ASTM D4479 / D4479M, “Standard Specification for Asphalt Roof Coatings - Asbestos-Free,” in which case, they
shall be installed in accordance with Sentence 9.13.3.3.(3) and with reinforcing material,
(d) ASTM D4637 / D4637M, “Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane,”
(e) ASTM D4811 / D4811M, “Standard Specification for Nonvulcanized (Uncured) Rubber Sheet Used as Roof
Flashing,”
(f) ASTM D6878 / D6878M, “Standard Specification for Thermoplastic Polyolefin Based Sheet Roofing,”
(g) CGSB 37-GP-9Ma, “Primer, Asphalt, Unfilled, for Asphalt Roofing, Dampproofing and Waterproofing,” where a
primer is required,
(h) CAN/CGSB-37.50-M, “Hot-Applied, Rubberized Asphalt for Roofing and Waterproofing,”
(i) CAN/CGSB-37.54, “Polyvinyl Chloride Roofing and Waterproofing Membrane,”
(j) CGSB 37-GP-56M, “Membrane, Modified, Bituminous, Prefabricated, and Reinforced for Roofing”,
(k) CAN/CGSB-37.58-M, “Membrane, Elastomeric, Cold-Applied Liquid, for Non-Exposed Use in Roofing and
Waterproofing,”
(l) CAN/CSA-A123.2, “Asphalt-Coated Roofing Sheets,”
(m) CAN/CSA-A123.4, “Asphalt for Constructing Built-Up Roof Coverings and Waterproofing Systems,” in which
case, they shall be installed with reinforcing material, or
(n) CSA A123.17, “Asphalt Glass Felt Used in Roofing and Waterproofing.”
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.