Flooring Installation Guide

Flooring Installation Guide

Nailing Down

Existing Timber Subfloor:

The subfloor should be structurally safe and free from any damp rot, fungal or insect infestation. The subfloor must be clean, free of chips and shavings, dry and level in accordance with British standards as set out in BS 8201-1987. +/- 3 mm over 3m. The subfloor thickness must be in accordance with current building regulation requirements (currently 18mm) and able to retain a 50mm cleat when fired into it at 45º. The subfloor must have moisture content no more than 11% WME and not below 7% WME. Always use the Woodpecker Moistop barrier paper (Page 161) over the subfloor with the black face down and overlap the joints by a minimum of 200mm. It may be necessary to tape the joints. When nailing, only the header joints should be glued The cleats should be no more than every 300mm.

Joists and battens:

The joists or battens should be structurally safe and free from any damp rot, fungal or insect infestation. The joists or battens must be clean, free of chips and shavings, dry and level in accordance with British standards as set out in BS 8201-1987. +/- 3 mm over 3m. The joists or battens must be of an appropriate width to retain 50mm cleats when fired into them at 45º. The joists must be spaced according to current building regulations. The subfloor must have moisture content no more than 11% WME and not below 7% WME. Always use the Woodpecker Moistop barrier paper (Page 161) over the subfloor with the black face down and overlap the joints by a minimum of 200mm. It may be necessary to tape the joints. When nailing only the header joints should be glued The boards should be nailed over every joist. It is possible to have header joints which are not over a joist as long as the boards either side are fully spanning the joists or battens.

Sticking Down

Cementitious subfloor:

The subfloor should be clean, dry and free from any contaminating residues. The subfloor must have a relative humidity of 75 or less. If the subfloor has a lightly dusty surface always use the Woodpecker 11P Surface Primer Sealer or the Woodpecker 21P Deep Sealer to bind the surface before applying the adhesive. If it is necessary to level the floor first apply Mira XP sealer and then always use Woodpecker Mira XP fibre reinforced self levelling compound. (Never use latex self levelling compounds. They do not have the tensile strength to resist the movement of the timber.) If there is any doubt as to the moisture levels in the subfloor always use the Woodpecker R410 Liquid damp Proof membrane which will seal the moisture below the surface of the floor and prevent the floor from expanding and distorting.

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