Premium Tile Backer Boards Tile Backer Boards are perfect for underfloor and under tile heating applications, and are ideal for 2 main purposes; - 1.) As a waterproof surface to fix wall or floor tiles to. 2.) As a first-class heat insulation solution for underfloor heating systems, lowering heat-up time and running costs. Premium Tile Backer Board Uses & Features: ---As a first-class heat insulation for underfloor heating systems. ---As a superior waterproof surface to fix wall or floor tiles. ---Tile backer boards are particularly suitable for underfloor heating mats and under tile heating cable applications. ---Will accept even the heaviest wall tiles, unlike plasterboard. (Correct installation method must be followed).