3M™ Sealing Tape 8777

3M™ Sealing Tape 8777 is a self-adhering, waterproof membrane designed for difficult-to-adhere-to surfaces. Its unique acrylic pressure-sensitive adhesive bonds aggressively, adheres to damp surfaces, and maintains adhesion at both low and high application temperatures, providing a unique combination of cold- and hot-temperature adhesion to most substrates, with no melting or staining in summer heat. The proprietary backing seals around hand-driven nails and staples to prevent moisture intrusion. While tough enough to resist punctures and tears, it remains thin and conformable enough to fit conveniently into corners. A split release liner enables fast application with easy, accurate positioning.

Applications include: Sealing joints around sills, jambs, and heads of rectangular windows in wood-frame construction; sealing around other wall interruptions, such as thresholds, dryer vents, and hose bibs; and concealed flashing in vertical walls in frame construction to prevent moisture intrusion and water infiltration.