6.2.7 Sheathing
Sheathing shall be durable and capable of providing structural resistance to racking.
The following materials are acceptable:
| Plywood | BS EN 636-2S or BS EN 636-3S |
| Oriented strand board | BS EN 300 type OSB/3 or OSB/4 |
| Moisture-resistant chipboard | BS EN 312 type P5 or P7 |
| Medium board | BS EN 622-3 type MBH.HLS1 or MBH.HLS2 |
| Impregnated soft board | BS EN 622-4 type SB.HLS |
| Proprietary sheathing materials | Technical Requirement R3 and used in accordance with the assessment |
Plasterboard may contribute to racking resistance when used in accordance with PD 6693-1. Limitations or exclusions apply to walls that are not separating walls comprising two or more built-up layers of plasterboard having a minimum thickness of 30mm, and walls where plasterboard is combined with a wood-based sheathing on the same wall diaphragm.
Last updated: 2nd January 2024