The Ontario Building Code | Materials
9.27.4.2. Materials
(1) Sealants shall be,
(a) non-hardening types suitable for exterior use,
(b) selected for their ability to resist the effects of weathering, and
(c) compatible with, and adhere to, the substrate to which they are applied.
(2) Sealants shall conform to,
(a) ASTM C834, "Latex Sealants",
(b) ASTM C920, "Elastomeric Joint Sealants",
(c) ASTM C1184, "Structural Silicone Sealants", or
(d) ASTM C1311, "Solvent Release Sealants".
(3) Backer rod shall conform to ASTM C1330, "Cylindrical Sealant Backing for Use with Cold Liquid-Applied Sealants".
9.27.5. Attachment of Cladding
In Plain Language
Sealant materials must conform to the standards referenced in this article, ensuring durable, flexible, weather-resistant performance.
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.