PERM-A-BARRIER® VPS (Vapor Permeable Sheet) is a vapor permeable air barrier membrane consisting of a proprietary breathable carrier film with a specially designed adhesive.

This product provides superior protection against the damaging effects of air and water ingress on building structures. It creates a solid barrier against air infiltration and exfiltration, which minimizes associated energy loss and condensation problems.

PERM-A-BARRIER® VPS membrane is vapor permeable for wall assemblies requiring this “breathable” characteristic. As a vapor permeable membrane, it permits the difusion of water vapor that may otherwise condense in the wall structure; but is impermeable to liquid water, which allows the material to act as a water drainage plain.

Features

• Fire Resistant—meets NFPA 285 as part of various wall assemblies
• Air tight—protects against air passage and associated energy loss
• Vapor permeable—“breathable” membrane prevents moisture from being trapped in the wall cavity by allowing walls the ability to dry
• Water resistant—resists hydrostatic water pressure and wind driven rain
• Self-adhered—eliminates the need for mechanical fasteners
• Controlled thickness—factory made sheet ensures constant, non-variable site application
• Lightweight—allows for easy handling and installation
• Flexible—accommodates minor settlement and shrinkage movement; bridges crack and joints in substrate
• Strong adhesion—to prepared construction substrates such as plywood, oriented strand board (OSB) block, masonry and exterior gypsum boards
• Compatible with PERM-A-BARRIER® Flashing Systems