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.