The Ontario Building Code | Flashing and Sealants
9.28.1.5. Flashing and Sealants
(1) Flashing and sealants used with stucco shall conform to Subsections 9.27.3. and 9.27.4., except that if aluminum flashing is used, it shall be separated from the stucco by an impervious membrane or coating.
9.28.2. stucco Materials
In Plain Language
Flashing and sealants are required with stucco cladding, as set out in this article, protecting vulnerable joints and terminations in this rigid cladding system.
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.