A self-adhering, vapor permeable weather resistive membrane with the reverse face coated by a pressure-sensitive adhesive for direct bonding to substrates.

Majvest 500 SA is a fully-adhered 3-ply, microporous membrane, designed for use as a long-lasting water-resistive barrier (WRB) and air-barrier (AB) component in commercial and residential buildings. Primer-free adhesion to most common building materials, including concrete, plywood, gypsum, and metal. Reliably sticky in cold temperatures thanks to SIGA’s proprietary acrylic adhesive technology. For above-grade wall applications.