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K11 Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/
casings

TYPES OF FLOORING/ SHEATHING/ DECKING /SARKING/ LININGS/ CASINGS

325 PARTICLEBOARD FLOORINGgenerally
• Substrate: site specific.
- Additional supports: site specific.
• Flooring: Particleboard to BS EN 312, Type P5.
- Thickness: 22 mm.
- Edges: Tongued and grooved all edges.
- Recycled content: Submit proposals.
- Other requirements: site specific.
• Setting out: Long edges running across joists. End joints central over joists and
staggered.
• Fixing to joists:
- Fasteners: 50 mm x 8 gauge wood screws into pilot holes.
- Fixing centres (maximum):
Around floor perimeter and along short edges of each board: 200 mm.
Along intermediate supports: 400 mm.
- Fixing distance from edges: 25 mm from long edges and minimum 10 mm from
short edges.
• Joint treatment: site specific.
• Expansion provision:
- Clear expansion gap around floor perimeter of floor area and any upstands: 1.5
mm per metre run of floor, with a minimum gap of 10 mm.
- Intermediate expansion/ movement joints: As recommended by flooring
manufacturer.

415 PLYWOOD WALL SHEATHING
• Substrate: site specific.
- Additional supports: site specific.
• Sheathing: Plywood manufactured to the relevant standards and quality control
procedures specified in BS 5268-2, and so marked.
- Type: Contractor's choice.
- Grade: n/a.
- Nominal thickness/ number of plies: site specific.
- Other requirements: site specific.
• Setting out: Long edges vertical and centred on supports.
- Expansion gap between adjacent boards (unless otherwise recommended by
manufacturer): 2-3 mm.
• Fixing to supports:
- Fasteners: 60 x 3.35 mm mechanical fixings.
- Fixing centres (maximum):
Around board edges: 150 mm.
Along intermediate supports: 300 mm.
- Fixing distance from edges (minimum): 25 mm from bottom edge of board and
10 mm from other edges.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01