The Ontario Building Code | Length of Fasteners
9.29.5.5. Length of Fasteners
(1) The length of fasteners for gypsum board shall conform to Table 9.29.5.5., except that lesser depths of penetration are permitted for assemblies required to have a fire-resistance rating provided it can be shown, on the basis of fire tests, that such depths are adequate for the required rating.
Table 9.29.5.5.
Fastener Penetration into wood supports
Forming Part of Sentence 9.29.5.5.(1)
| Item | Column 1 | Column 2 | Column 3 | Column 4 | Column 5 |
|
| Required Fire-Resistance Rating of Assembly | Minimum Penetration, mm |
|
| |
|
| walls |
|
| ||
|
|
| Nails | Screws | Nails | Screws |
| 1. | Not required | 20 | 15 | 20 | 15 |
| 2. | 45 min | 20 | 20 | 30 | 30 |
| 3. | 1 h | 20 | 20 | 45 | 45 |
| 4. | 1.5 h | 20 | 20 | 60 | 60 |
In Plain Language
Fasteners for this interior finish must meet the minimum length requirements set out in this article, ensuring adequate penetration into the framing or furring behind it.
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.