The Ontario Building Code | Masonry Unit Standards
9.20.2.1. Masonry Unit Standards
(1) Masonry units shall comply with,
(a) ASTM C73, "Calcium Silicate Brick (Sand-Lime Brick)",
(b) ASTM C126, "Ceramic Glazed Structural Clay Facing Tile, Facing Brick, and Solid Masonry Units",
(c) ASTM C212, "Structural Clay Facing Tile",
(d) CAN/CSA-A82.1-M, "Burned Clay Brick (Solid Masonry Units Made from Clay or Shale)",
(e) CSA A82.4-M, "Structural Clay Load-Bearing Wall tile",
(f) CSA A82.5-M, "Structural Clay Non-Load-Bearing Tile",
(g) CAN3-A82.8-M, "Hollow Clay Brick",
(h) CAN/CSA-A165.1, "Concrete Block Masonry Units",
(i) CAN/CSA-A165.2, "Concrete Brick masonry Units",
(j) CAN/CSA-A165.3, "Prefaced Concrete Masonry Units", or
(k) CAN3-A165.4-M, "Autoclaved Cellular Units".
In Plain Language
Masonry units, such as brick and block, must conform to the standards referenced in this article, ensuring consistent strength and durability.
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.