INSL8 Tile Backer Boards offer a cost-effective, 100% waterproof solution for tiling in moisture-prone areas like bathrooms, wetrooms, kitchens, and laundry rooms. Measuring 1200 x 600mm, these lightweight boards are easy to handle and install. Made from durable extruded polystyrene with a reinforced glass fiber and cement coating, they provide a stable and waterproof surface for tiles. They can be secured to studs or subfloors with screws and washers or fixed using flexible tile adhesive. Easy to cut with a sharp blade or saw, they are also perfect for use with electric underfloor heating mats and cables.