The Ontario Building Code | Alternate Installation Methods
9.26.1.2. Alternate installation Methods
(1) Methods described in CAN3-A123.51-M, "asphalt Shingle application on Roof Slopes 1:3 and Steeper", or CAN3-A123.52-M, "asphalt Shingle application on Roof Slopes 1:6 to Less than 1:3", are permitted to be used for asphalt shingle applications not described in this Section.
In Plain Language
Alternate roof installation methods may be used under the conditions set out in this article, provided they achieve equivalent weatherproofing performance to the prescribed methods.
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.