The Ontario Building Code | Thickness
9.29.6.1. Thickness
(1) Except as provided in Sentences (2) and (3), the minimum thickness of plywood interior finish shall conform to Table 9.29.6.1.
Table 9.29.6.1.
Thickness of Plywood interior Finish
Forming Part of Articles 9.29.6.1., 9.29.6.2. and 9.29.9.2.
| Item | Column 1 Maximum Spacing of supports, mm o.c. | Column 2 Minimum Thickness, mm(1), on supports with no Horizontal Blocking | Column 3 Minimum Thickness, mm(1), on supports with Blocking at Vertical Intervals not exceeding 1.2 m |
| 1. | 406 | 4.7 | 4.0 |
| 2. | 610 | 8.0 | 4.7 |
Notes to Table 9.29.6.1.
(1) Thickness limits shall apply to the net effective thickness (NET) of grooved, striated, textured and/or embossed panels and to the actual thickness of flat panels.
(2) A manufacturing tolerance of -0.4 mm may be applied to the thicknesses listed in Table 9.29.6.1.
(3) No minimum thickness is required where plywood is applied over continuous backing.
In Plain Language
This interior finish 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.