StormStopper FSU (Film Surface Underlayment) is a 45-mil, self-adhering underlayment and waterproofing membrane composed of a polymer film with an embedded traction surface. The film is laminated to a specialized rubberized asphalt adhesive that adheres in temperatures of 40°F or higher. StormStopper FSU installs under roofing at edges, eaves, valleys, skylights and chimneys to protect from leaks due to ice dams, melting snow and wind-driven rain. It is suitable for new construction and reroofing and adheres to most clean, dry substrates. StormStopper FSU comes in a 36" wide x 66.7' long roll (200 sq ft). Packaged one roll per carton. 5-Year warranty.