6.2.5 Fixing the frame
The timber frame shall be suitably fixed to the substructure.
Shotfiring
Where shotfiring:
- into masonry, solid concrete blocks should be specified as BS EN 771 with a minimum crushing strength of 7.3N/mm2 and positioned to receive fixings
- the blocks in beam and block floors should be grouted
- care should be taken not to spall edges of masonry or slabs.
Anchoring
When anchoring the frame:
- the sole plate should be adequately anchored to the substructure so that the frame can resist both lateral and vertical forces
- care should be taken to avoid splitting timber plates or damaging the substructure.
Holding-down devices should be durable, as detailed in the design and manufactured from:
- austenitic stainless steel to BS EN 10088-1, minimum grade 1.4301
- galvanised mild steel with zinc coating to BS EN ISO 1461, minimum coating 940 g/m2 on each side.
Sole plate anchors within the internal envelope should be galvanised mild steel, minimum coating Z275.
Last updated: 2nd January 2024