The presence of moisture in a roof system can cause major problems down the line. Installing a One-Way Moisture Relief Vent can be a cost-effective and minimally invasive way to eliminate moisture under the roof surface.The MRV 600 Roof Vent is engineered to prolong the life of the roof system by reducing both moisture within the roof system and trapped air pressure within the building.
1. Apply a 3 course coating and fabric utilizing the PM PF200 Polyester Fabric and PM Silicone Coating.
a. Apply 12 to 15 mils of silicone coating over surface to receive fabric.
b. Embed fabric into silicone coating while still wet. Fabric should extend at least 2” on to the flange of the vent and at least 4” on to the roof surface.
c. After the base coating has cured, apply a generous coat of silicone coating over the fabric to ensure complete saturation.
2. Apply PM FT500 Self-Sealing Butyl Fleece Tape.
a. Install fleece tape a minimum of 2” on to the flange of the vent and extending at least 2” on to the roof surface per the application guidelines on the FT500 Technical Product Data sheet.
b. Apply a generous coat of PM Silicone Coating to the surface of the fleece tape. Ensure coating is applied generously to ensure a good seal over the fleece surface.
Note: If the roof system has an existing silicone coating, vent must be flashed-in with only the first option above as the butyl fleece tape will not adhere to the silicone coating.