The Ontario Building Code | Corbelling
9.20.12.1. Corbelling
(1) All corbelling shall consist of solid units.
(2) The units referred to in Sentence (1) shall be corbelled so that the horizontal projection of any unit does not exceed 25 mm and the total projection does not exceed one-third of the total wall thickness.
In Plain Language
Corbelling in masonry walls generally must meet the requirements set out in this article, covering the technique of stepping courses outward.
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.