The Ontario Building Code | Lumber Subflooring
9.23.14.7. Lumber Subflooring
(1) Lumber subflooring shall be laid at an angle of not less than 45° to the joists.
(2) Lumber subflooring shall be fully supported at the ends on solid bearing.
(3) Lumber for subflooring shall be of uniform thickness and not more than 184 mm wide.
9.23.15. Roof Sheathing
In Plain Language
Lumber subflooring, an alternative to panel-type subflooring, 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.