- EGGER OSB HDX boards should be laid with the longest edges at right angles to the
joists so all short end joints land on a joist. Where this is not the case, refer to local
building authority guidelines.
- Joints should always be staggered in a brick bond fashion, with the perimeter of
the floor continuously supported.
- An expansion gap of 10 mm or 2 mm per metre run (whichever is greater) should be
provided to the floor perimeter and against all walls and abutments. For floors which
are in excess of 10 m long, intermediate movement gaps should be incorporated and
finished with a compressible filler or proprietary movement joint cover.
- Fastenings should be made not less than 25 mm from the board edges. All boards must
be securely fastened to each joist or noggin with a fixing of a size and type suitable
for the design of the supporting joists. For example, if fitting boards on a metal frame
it would be advisable to use 50 mm, 12 gauge self-tapping screws. Alternatively, if
boards are being fixed to timber joists it would be advisable to use No. 8 screws, at
least 60 mm in length.
- Fasteners should be spaced around the perimeter of the board at one fixing per joist
and then add a single fixing per joist in the centre of the board.
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