In Plain Language

This clause sets minimum cross-sectional sizes for unit masonry columns: at least 290 mm by 290 mm, or 240 mm by 380 mm, whichever shape applies to the design.

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.