Imus Seal is a self-adhering, 20-mil-thick flashing tape that can be applied in temperatures ranging from 20°F to 180°F. The U.S.-made tape combines a pressure-sensitive 12-mil butyl waterproof membrane with a high-density polyethylene backing for strength, and according to the manufacturer, meets AAMA 711 performance standards. Designed to protect deck joists and beams, the 50-foot rolls are available in 1 5/8-inch, 4-inch, and 6-inch widths, for $17, $35, and $50, respectively.