The Ontario Building Code | Maximum Spacing of Supports
9.29.5.3. Maximum Spacing of supports
(1) Maximum spacing of supports for gypsum board applied as a single layer shall conform to Table 9.29.5.3.
Table 9.29.5.3.
Spacing of supports for gypsum Board
Forming Part of Sentence 9.29.5.3.(1)
| Item | Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
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| Thickness, mm | Orientation of Board to Framing | Maximum Spacing of supports, mm o.c. |
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| walls |
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| Painted Finish | water-Based Texture Finish |
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| 1. | gypsum board conforming to Sentence 9.29.5.2.(1) (except Sections 9 and 12 of ASTM C1396 / C1396M) | ||||
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| 9.5 | Parallel | — | — | — |
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| Perpendicular | 406 | 406 | — |
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| 12.7 | Parallel | 610 | 406 | — |
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| Perpendicular | 610 | 610 | 406 |
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| 15.9 | Parallel | 610 | 406 | — |
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| Perpendicular | 610 | 610 | 610 |
| 2. | gypsum board conforming to Clause 9.29.5.2.(1)(c) (only Section 12 of ASTM C1396 / C1396M) |
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| 12.7 | Parallel | 610 | 406 | — |
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| Perpendicular | 610 | 610 | 610 |
In Plain Language
A maximum spacing of supports is set out in this article for this interior finish material, ensuring it doesn't sag or crack between fastening points.
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.