All timber floors including floor boards, chipboard or plywood must be assessed to confirm their structural integrity and suitability for tiling prior to the installation of electric underfloor heating. Floorboards will always require the provision of insulated tile backing boards prior to heating being installed. Electric underfloor heating mats and cables can be fitted directly to ply-wood and moisture proof chipboard provided the floor is treated with a suitable priming solution. The design will vary from 100w/m² to 150w/m² dependent upon the specification of the floor base.