The Ontario Building Code | Second Coat
9.28.6.4. Second Coat
(1) The second coat shall be not less than 6 mm thick.
(2) The surface of the second coat shall be lightly roughened to provide a key with the finish coat if the finish coat is other than stone dash.
In Plain Language
The second stucco coat (brown coat) must meet the requirements set out in this article.
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.