If the flooring is causing draughts, use insulation between suspended floor joists. If there are gaps between floorboards, use thin strips of softwood. Plane them into wedged strips and tap the wood into place using a mallet. Adhesive can be applied to the strip to help make a neat finish. Once dry, plane away any surplus surface wood. Use a thick underlay and a deep piled carpet.
For smaller gaps, an acrylic sealant can be used. This gives a flexible finish, but can be expensive.
If the floor is in a bad state generally, it may be advisable to cover the surface completely with hardboard panels.
If the draughts are at the junction of the floor and the skirting, use mastic to seal the gap with wooden quadrant.
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