The Jackoboard Plano 1200 x 600 x 6mm Insulated Tile Backer Board is created with an extruded polystyrene foam core and a special coating on both sides, making it a perfect solution as a base for tiling. The Jackoboard construction board surface provides an extremely strong bond and will work on practically any surface. This tile backer board is waterproof and provides thermal insulation while being lightweight, easy-to-handle, and very strong.