DuPont Flashing Tape helps protect the heads and jambs of rectangular doors and windows from air and water intrusion. A self-adhered, 100% butyl-backed flashing tape to help create a protective envelope around heads and jambs of rectangular windows and doors. It provides nine months UV resistance and also helps to protect heads and jambs of rectangular windows and doors from air and water intrusion with DuPont Flashing Tape. Wind-driven rain and outdoor air can find their way into walls around windows and doors. By helping to seal the building envelope, self-adhered DuPont Flashing Tape can help reduce the risk of water damage, increase building comfort, and improve energy efficiency.