The gypsum panels feature a specially formulated moisture-resistant core with engineered fiberglass facers, making them ideal for use behind tiles in interior rooms frequently subjected to moisture and high humidity, such as tub and shower surrounds, bathrooms, kitchens, laundry rooms, utility rooms and other spaces. In addition, GlasRoc Tile Backer Type X is UL and ULC certified and may be used in UL and ULC fire resistance-rated assemblies.