Grace Vycor Butyl self-adhered flashing helps protect windows, doors and other non-roof detail areas from the negative effects of water and moisture. When properly installed, it can reduce the risk of rot and mold development, often associated with costly call-backs. It is appropriate for use in high-temperature areas (such as the desert southwest areas of the U.S.), although it provides excellent protection and can be installed in all areas of the U.S. and Canada. Grace Vycor Butyl self-adhered flashing is composed of durable, cross-laminated high-density polyethylene sheet, backed by an aggressive butyl adhesive.