The Ontario Building Code | Installation of Protective Materials
5.6.1.2. installation of Protective Materials
(1) Where a material applied to a sloped or horizontal assembly is installed to provide required protection from precipitation and its installation is covered in the scope of one of the following standards, installation shall conform to the requirements of the respective standard:
(a) CAN/cgsb-37.51-M, "application of Hot Applied Rubberized asphalt for Roofing and waterproofing",
(b) cgsb 37-GP-55M, "application of Sheet Applied Flexible Polyvinyl Chloride Roofing Membrane",
(c) CAN3-A123.51-M, "asphalt Shingle application on Roof Slopes 1:3 and Steeper", or
(d) CAN3-A123.52-M, "asphalt Shingle application on Roof Slopes 1:6 to less than 1:3".
(2) Where masonry applied to vertical assemblies is installed to provide required protection from precipitation, installation shall conform to the requirements of CAN/CSA-A371, "masonry Construction for buildings".
(3) Where protective materials are applied to assemblies to provide the required protection from precipitation, the materials shall be installed so as to shed precipitation or otherwise minimize its entry into the assembly and prevent its penetration through the assembly.
5.6.2. Sealing, drainage, Accumulation and Disposal
In Plain Language
Where a material applied to a sloped or horizontal assembly is installed to provide required weather protection, its installation must follow specific requirements ensuring the material actually performs that protective function.
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.