The Ontario Building Code | Thickness
9.27.8.2. Thickness
(1) Plywood cladding shall be not less than 6 mm thick when applied directly to sheathing.
(2) When applied directly to framing or over furring strips, plywood cladding thickness shall conform to Table 9.27.8.2.
Table 9.27.8.2.
Minimum Plywood Cladding Thickness
Forming Part of Sentence 9.27.8.2.(2)
| Item | Column 1 Spacing of supports, mm | Column 2 Minimum Thickness, mm, where Face Grain Parallel to supports | Column 3 Minimum Thickness, mm, where Face Grain at Right Angles to supports |
| 1. | 406 | 8 | 6 |
| 2. | 610 | 11 | 8 |
(3) The thickness of grooved or textured plywood shall be measured at the point of least thickness.
In Plain Language
This cladding material must meet the minimum thickness 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.