The Ontario Building Code | Finish Coat
9.28.6.5. Finish Coat
(1) When the finish coat is other than stone dash, the base shall be dampened but not saturated before the finish coat is applied.
(2) The thickness of the finish coat shall be not less than 3 mm.
(3) When a stone dash finish is used, the stone shall be partially embedded in the second coat before the second coat starts to set or stiffen.
Section 9.29. interior Wall and ceiling Finishes
9.29.1. General
In Plain Language
For stucco-type finishes, this clause sets application rules for the final coat: the base must be damp (not soaked) before applying it, the coat must be at least 3 mm thick, and if it's a stone-dash finish, the stone needs to be pressed in before the coat starts to set.
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.