The Ontario Building Code | Materials
9.29.5.2. Materials
(1) gypsum products shall conform to,
(a) CAN/CSA-A82.27-M, "gypsum Board",
(b) ASTM C1178 / C1178M, "Coated glass Mat water-Resistant gypsum Backing panel", or
(c) ASTM C1396 / C1396M, "gypsum Board".
In Plain Language
Materials for this interior finish must conform to the standards referenced in this article.
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.