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 | Edge Support

9.23.15.6. Edge support

(1) Except as permitted in Sentence (2), where panel-type roof sheathing requires edge support, the support shall consist of,

(a) metal H clips, or

(b) not less than 38 mm by 38 mm blocking securely nailed between framing members.

(2) The supports referred to in Sentence (1) are not required when tongued-and-grooved edged panel-type sheathing board is used.

In Plain Language

Roof sheathing panels need edge support as set out in this article, preventing unsupported edges from sagging or separating over time.

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.