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 |
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| ||
|
|
| 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 |