The Fastwarm Tile Backer Board is the perfect insulation panel for use with Fastwarm 150w/200w/cable heating systems. The boards will dramatically reduce heat loss and running costs by up to 25%. The ultra-light weight backer board can be easily cut to size or to work around fixed appliances and are perfect for transporting on site due to their lightweight but strong structure. Tile backer boards are waterproof Approved by Ultra Tile adhesive manufacturers Super high insulation values per m4 Suitable for wet rooms and replacing plasterboard in bathrooms Thermal conductivity value of 0.034 W/mK.