The LayfastSBS® family is engineered to outperform traditional organic felt by combining SBS-modified asphalt with a durable, inorganic fiberglass reinforcement layer. Both TU35 and TU43 provide exceptional strength, stability, and walkability - offering contractors a reliable mechanical base that resists buckling, wrinkling, and moisture-related deterioration.

This unified underlayment system is ideal for tile, shake, and shingle roofing applications, with TU43 additionally suitable for advanced assemblies requiring vapor-retarder performance or heavy-duty durability.

TU35 is a premium mechanical underlayment designed for contractors who want a robust alternative to organic felt. Its SBS-modified composition and fiberglass mat reinforcement ensure superior lay-flat characteristics and long-term stability under tile, shake, and shingle applications.

TU43 is a high-performance mechanical base sheet built for more demanding roofing assemblies. In addition to increased thickness and durability, TU43 is formally certified as an IBC Class I Vapor Retarder, making it ideal for climate-controlled structures and advanced roof system designs including torch-down APP/SBS and B.U.R. systems.