Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
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The Ontario Building Code | Framing around Openings

9.23.13.2. Framing around openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings

(1) Roof and ceiling framing members shall be doubled on each side of openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings greater than two rafter or joist spacings wide.

In Plain Language

Framing around openings in a roof or floor, such as for a skylight or stairwell, must meet the requirements set out in this article.

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.