Protection Board-HS is a heavy-duty modified bitumen protection board that consists of a medium-weight fiberglass mat with a high-quality SBS rubber and asphalt blend. This elastomeric asphalt blend provides elasticity and flexibility to the sheet. The inorganic fiberglass provides high tensile strength, tear resistance and dimensional stability. It is used to protect the membrane from damage caused by foot traffic and physical abuse from other trades. Commonly used in plaza decks, inverted roofing systems, parking decks with asphalt overlayments and other horizontal surfaces to which waterproofing membranes have been applied.