Self-Adhesive Through-Wall Membrane – 4" x 75' – 1 mm

Designed for through-wall transitions and flashing details in residential and commercial applications, this self-adhered, all-weather membrane helps ensure reliable air- and water-vapor in wall assemblies. The 4" x 75' roll, 1 mm (40 mils) thick, is made of SBS-modified elastomeric bitumen with a trilaminated woven polyethylene facer that is compatible with spray polyurethane foam insulation. Supplied as a continuous roll with straight-cut edges, it integrates smoothly into typical building-envelope systems for new construction and renovation. An nominal 75 lb/in resistance provides a helpful reference during installation planning.