XtremeFlashing WS25-4 is a self-adhering, self-sealing waterproofing tape designed for use around windows, doors, building seams and in general construction.

XtremeFlashing is a self-adhering, self-sealing flashing tape designed for use around windows, doors, building seams and in general construction. It is composed of a polymer film that is coated with an aggressive Broad Temperature Spectrum (BTS) asphalt adhesive. A release liner protects the adhesive and is removed as the tape is installed. The BTS adhesive self-seals around punctures such as nails and staples. This advanced system bonds to all common building and window materials and seals around fasteners.