Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Materials

9.17.5.1. Materials

(1) Unit masonry columns shall be built of masonry units,

(a) conforming to CAN/CSA-A165.1, "Concrete Block masonry Units", and

(b) having a compressive strength over the net area of the block of not less than 15 MPa.

In Plain Language

Materials used for a related structural element in this Section must meet the requirements set out 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.