The Ontario Building Code | Chases or Recesses Cut into Walls
9.20.7.5. Chases or Recesses Cut into walls
(1) Chases or recesses shall not be cut into walls made with hollow units after the masonry units are in place.
9.20.8. support of Loads
In Plain Language
Chases or recesses cut into an existing wall (rather than built in from the start) must meet the requirements set out in this article, addressing the different structural implications of cutting after the fact.
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.