The PERM-A-BARRIER VPL50 is a permeable, liquid-applied air barrier. It features a unique chemical formula that does not wash off when exposed to light rain following application. Its membrane minimizes the impact of weather on projects with its rain-resistant silyl-terminated polyether (STPE) technology. The roller-applied air barrier helps reduce delays and time-consuming re-applications due to weather, driving down the cost of installation. The product does not sacrifice performance for rain resistance. The VPL50 air barrier offers superior protection against the damaging effects of air and liquid water ingress on building structures. The seamless membrane creates a solid barrier against air infiltration and exfiltration, which minimizes associated energy loss and condensation problems. It is flexible and durable and meets critical air barrier industry standards. It is also NFPA 285 compliant in a number of wall assemblies.

More information is available at