The Everbilt Underlayment Kit offers an install solution 1/4 in.tile underlayment panel for tile underlayment that works with all kitchen floors, bathroom floors, and other large wet floor areas in your home. Ideal for electric floor warming systems. Backer Boards are 36 in. x 48 in. x 1/4 in. provided to you in an ideal kit which covers 75 sq. ft. This tile floor backer board is thin and ultra lightweight yet has high bond strength and heavy-duty tile floorboard is easy to install and easy to handle, allowing you to tile directly onto the backer board. These waterproof boards (on both sides) are easily cut down without any mess left behind and are fastened to the substrate with the Everbilt screws and washers. Kit includes five (5) 1/4 in. backer boards, two 11 oz. tubes of multipurpose construction adhesive, and 160 screw and washers for fastening backer boards. Material: Acrylic Adhesive.