Protect your windows and doors from rough weather with the 6 in. x 75 ft. ZIP System Valley Window/Door Flashing. When properly installed, this versatile tape can help seal against wind-driven rain and air infiltration and defend against mold, mildew and premature decay. 1 roll is typically enough material to flash 3 standard windows or 2 doors. Helps to defend against mold, mildew and premature decay. Made of an advanced acrylic adhesive, proven to deliver a superior airtight and watertight seal that withstands many years of harsh weather. Can be quickly and easily applied by hand. Stops wind and water around window and door frame