Protecto Wrap The 9-inch BT25XL peel-and-stick sealing tape was developed in response to ASTM standard E 2112 requiring a minimum 9-inch-wide flashing at fenestrations. The 20-mil poyethylene-backed rubberized adhesive membrane self-seals around fasteners and prevents water intrusion and air leakage. The tape incorporates a built-in serration at the 4-inch mark so installers can peel and stick that portion to cover a window's bottom sill and the exterior substrate, leaving the remaining 5-inch portion un-adhered so housewrap can be tucked under it; the 5-inch section is then sealed over the housewrap material. 800.759.9727.