Liberty SBS Self-Adhering Cap Sheet is a durable, modified bitumen membrane designed and manufactured to meet industry and code requirements. The product is designed for use as a waterproofing membrane and is reinforced with a polyester mat, which is coated with a polymer-modified asphalt. Liberty systems are applied without torches, open flames, hot asphalt, or messy solvent-based adhesives and are suitable for primed plywood decks and many other substrates. Color Tan.