TILITE USA 2.67 ft. x 4 ft. x 1/4 in. XPS Foam Waterproof Backer Board Underlayment for Floor Tile and Stone (5-Pack)

tīLite Backer Board offers builders and tile contractors a strong, lightweight, and waterproof tile substrate for wet areas. It is an XPS foam panel manufactured with a proprietary blend of synthetic polymer mortar for high bond strength and fiber mesh to give it rigidity. Pack of 5. Pair with tīLite screws and washers.