The Ontario Building Code | Purpose of Roofing
9.26.1.1. Purpose of Roofing
(1) Roofs shall be protected with roofing, including flashing, installed to shed rain effectively and prevent water from entering the roof as a result of ice damming.
(2) For the purpose of Sentence (1), roofs shall include platforms that effectively serve as roofs with respect to accumulation or drainage of precipitation.
In Plain Language
Roofing serves the purpose of keeping water out of the building, as set out in this article, forming the basic principle behind the detailed roofing material and installation requirements that follow.
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.