The Ontario Building Code | Distance to Edge of Supporting Members
9.20.8.5. Distance to Edge of supporting Members
(1) masonry veneer of hollow units resting on bearing support shall not project more than,
(a) 30 mm beyond the supporting base where the veneer is not less than 90 mm thick, and
(b) 12 mm beyond the supporting base where the veneer is less than 90 mm thick.
(2) masonry veneer of solid units resting on bearing support shall not project more than one-third of the width of the veneer.
(3) Where the masonry veneer described in Sentence (2) is rough stone masonry,
(a) the projection shall be measured as the average projection of the units, and
(b) the width of the veneer shall be measured as the average width of the veneer.
9.20.9. Bonding and Tying
In Plain Language
A minimum distance must be maintained from the edge of a supporting masonry member, as set out in this article, preventing a bearing load from being placed too close to an edge where it could cause spalling or failure.
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.