On joist centres up to 450 mm, 18 mm panels may be used, but on joist centres up to 600 mm, 22 mm panels must be used.
| Board | Max span (mm) | Qk Uniformally distributed load kn/m2 |
QK Concentrated point load kn SC1 |
QK Concentrated point load kn SC2 |
| 18mm P5 | 450 | 11.3 | 3.7 | 2.6 |
| 22mm P5 | 600 | 3.2 | 3.0 | 2.0 |
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