Profilitec SHOWERTEC STBO 4' x 8' Board - Pallet A multilayer tile substrate for the shower and bathtub surrounds the STBO Showertec Board, which comprises fleece webbing on both sides of heat-bonded polypropylene layers. Polypropylene, a thermoplastic polymer frequently employed in various applications due to its durability and resistance to heat and moisture, is the primary material utilized in its manufacture. Packaging 4' x 8' sheet panel 80 panels per package Fleece webbing on both sides The soft, non-woven surface fleece guarantees that the thin-set mortar is firmly anchored To make installation easier and faster, printed gridlines spaced at 3/8" (10 mm) are present on the board's surface Intended to endure the punishing circumstances found in shower and bathtub settings, where moisture, steam, and heat are always present It offers a stiff and dimensionally stable foundation for tile and other surface materials and is entirely waterproof