 The
FP-10 One Way Roof Vent is a solar operated, moisture/vapor venting unit designed to
release and prevent the re-entry of moisture laden air in new or existing lightweight fill
decks and built-up roofing systems.
The venting unit consists of three major components: A one
piece roof deck flange and body, a weatherproof cap, and a silicone rubber valve. The deck
flange is 10" in diameter, while the body has a base diameter of 4½ " and a
height of 6".
The Black Cap FP-10 Roof Vent is manufactured of black
polyethylene and is designed for use with typical built-up roofing and modified bitumen
systems. For torch applied systems, do not apply flame directly to vent.
The Gray Cap FP-10 Roof Vent manufactured with a
black-pigmented ABS plastic resin is available for use with EPDM single ply roofing
systems.
As the sun heats the roofing membrane, causing trapped
moisture-laden air to expand, the one way valve is forced open, releasing the moisture
into the surrounding atmosphere. When the roofing membrane cools, the process is reversed.
Cooler air in the roof sandwich contracts, tending to draw moisture-laden air into the
roof system. The one way valve closes preventing its re-entry. The one way silicone-rubber
valve also prevents the entry of snow and wind-blown rain.
Included in all Johns Manville Roofing Systems Guarantees
for total system responsibility.
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