The Dow Vented Roof System (VRS) is installed over a monolithic deck or an air-permeable deck in conjunction with an air barrier. The membrane is air sealed at all through-deck penetrations and at the roof perimeter, effectively eliminating air movement from the building's interior to the underside of the roofing system. Any existing air between the membrane and deck is vented to the exterior through a series of strategically placed one-way air-release vents.
Dow VRS technology transfers the uplift load from the roofing system to the deck, creating a vacuum within the system, resulting in a roof that lays flat and stays in place during windstorms.
As this schematic shows, negative external and positive internal pressure differential creates an uplift force that tries to push conventional, nonvented, nonsealed roof systems off the building.
Dow Vented Roof System Specifications (988KB PDF) require a sealed roof deck to prevent wind uplift forces from reaching the underside of the roof system. In this schematic, one-way VRS vents harmlessly release any expanding air between the membrane and deck to the exterior.
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