The Durabase XPS foam backer board offers builders and tile contractors a strong, lightweight, waterproof, and vapor-retardant tile base for wet areas. It is an XPS foam panel manufactured with a waterproof proprietary blend of synthetic polymer mortar and an alkali resistant fiber mesh. This gives it a highly rigid structure and exceptional bonding strength. It is intended for use with the DURAL Screw and Washer Pack, to quickly fasten the Durabase XPS board to supporting studs. Designed for absolutely no waste when waterproofing shower walls, where as traditional backer boards have over 25% of waste Lightweight, rigid design for easy and accurate tile installation Easy to cut with no mess Seams and corners should be cover with urethane or Durabase WP Seam Tape High bond strength due to the cementitious coating Made for use with the DURAL Screw and Washer pack, purchased separately Made in Egypt. Material: Plastic.