The Ontario Building Code | Required Roof Sheathing
9.23.15.1. Required Roof Sheathing
(1) Except as provided in Section 9.26., continuous lumber or panel-type roof sheathing shall be installed to support the roofing.
In Plain Language
Roof sheathing is required over rafters or trusses, as set out in this article, providing a structural base for the roofing material above.
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.