SwiftAnchor™ Base Sheet is a high-performance synthetic base sheet or anchor sheet specifically designed for optimal adhesion of Westlake Royal TileSeal™ HT and Westlake Royal™ MetalSeal HT underlayments. An innovative, patented nail gasketing technology for superior moisture resistance combined with a high grip backing for deck grab and superior walkability make this product of choice for a nailable base sheet. Each roll is approximately 10 squares (1,000 sqft) weighing only 45 lbs per roll making installation Swift and easy to Anchor down for the high winds of Florida.