Stormtite® is an engineered multilayered synthetic roofing underlayment used as a 15 lb. felt replacement. It has a textured top surface and is made with a uniquely engineered polyolefin blend that exhibits excellent water resistance, high strength to weight ratio and good pliability for ease of application. The UV stabilizer in all layers of the material means it may be used as a temporary covering for up to 1 month. Stormtite® is an impervious, high tear strength underlayment ideal for secondary water shedding beneath shingled roofs. It is flexible, and easily installed around vent stacks, dormers, chimneys and other roof-top structures. Each roll is pre-printed with side lap lay lines and dots positioned at the recommended fastener locations.