The Ontario Building Code | Applicable Standards
5.10.2.2. Applicable Standards
(1) windows, doors and skylights shall conform to the requirements in,
(a) AAMA/WDMA/CSA 101/I.S.2/A440, "NAFS – North American Fenestration Standard/Specification for windows, Doors, and Skylights", and
(b) CSA A440S1, "Canadian Supplement to AAMA/WDMA/CSA 101/I.S.2/A440, NAFS – North American Fenestration Standard/Specification for windows, Doors, and Skylights".
(2) Performance grades for windows, doors and skylights shall be selected according to the Canadian Supplement referenced in Clause (1)(b) so as to be appropriate for the conditions and geographic location in which the window, door or skylight will be installed.
(3) windows, doors and skylights shall conform to the performance grades selected under Sentence (2) when tested in accordance with the standard referenced in Clause (1)(a).
In Plain Language
Windows, doors, and skylights must conform to the referenced North American Fenestration Standard (AAMA/WDMA/CSA 101/I.S.2/A440) and related standards, establishing consistent performance benchmarks for these products.
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.