Perm-A-Barrier VPS (Vapor Permeable Sheet) is a self-adhering vapor permeable
air barrier membrane consisting of a breathable carrier film with a specially
designed adhesive. Its “breathability” prevents moisture from being trapped in
the wall cavity by allowing walls the ability to dry. As with other products in
the Perm-A-Barrier
line, it creates a solid barrier against air infiltration and exfiltration. The
product resists hydrostatic water pressure and wind driven rain. Self-adhered,
it eliminates the need for mechanical fasteners and the controlled thickness of
the membrane ensures constant, non-variable site application. Its light weight
allows for easy handling and installation, and its flexibility accommodates
minor settlement and shrinkage movement while bridging cracks and joints in the
substrate. Perm-A-Barrier VPS is compatible with Grace Perm-A-Barrier Flashing
Systems.
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