When it comes to residential window flashing, DuPont Flashing Tape is ideal for helping to protect heads and jambs of rectangular windows. By bridging the interface between the rough opening and building envelope, StraightFlash protects these vulnerable areas that are so often subject to potential water damage. DuPont StraightFlash is a premium, self-adhered flashing made with DuPont Tyvek and a 100% butyl-based adhesive layer. This makes for a durable, premium window flashing that helps protects rain from entering around window openings in commercial structures. When used as part of the DuPont Weatherization Systems, DuPont Flashing Tape also helps contribute towards U.S. Green Building Council LEED points, helping you create more sustainable, durable commercial structures that continue to operate efficiently. DuPont Flashing Tape , a premium, durable, self-adhered window flashing material made with a 100% butyl-based adhesive layer is designed to protect the heads and jambs of rectangular windows. DuPont qualifies its flashing products to several key industry-approved standards including the AAMA 711-07 Voluntary Specification for Self Adhering Flashing Used for Installation of Exterior Wall Fenestration Products. Flashing Tape comes backed by a limited product warranty from DuPont, a company dedicated to providing innovative and reliable products for over 200 years. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.