Vapor Barrier Under Tpo Roof

Resolution of the vapor barrier debate.

Vapor barrier under tpo roof.

Typically a vapor retarder has to have a perm rating of 1 0 or less to be successful. That reduction of air and moisture infiltration can then help improve roof longevity. Some debate still occurs over how necessary vapor barriers are but a consensus is growing closer. For any warrantable 20 year ultraply tpo roof system the ultrablend system is an option for wall flashings and details.

The warm moist air equalizes to the exterior where the air is cooler and drier. Everyone knows that water in roof systems is never a positive. Frame wall with cavity insulation and brick or stone veneer with interior vapor barrier. Gaf tpo roofing membranes include.

Most authorities now agree that vapor barriers are important under certain conditions but not necessarily as a whole house solution for every home. A vapor barrier can be loose laid or. Contact the roof system solutions group at firestone building products for additional information. In circumstances where conditions inside a home or office are much different than outdoor conditions water.

A vapor retarder is typically installed on the warm interior side of a roof or wall. A roof design that includes an adhered roof membrane with multiple layers of insulation with board joints offset and staggered over a vapor retarder air barrier helps lower the risk that air and the moisture it carries will infiltrate the roof system. About half of our indiana projects specify a vapor barrier under the roof insulation. In a roof assembly the vapor retarder is normally installed under the primary roof insulation.

Found in this manual. Smooth tpo fleece back tpo self adhered tpo tpo colors extreme tpo. The vapor barrier protects the roof insulation from the vapor included in the interior air. Therefore you will often see it installed directly on a roof deck such as a concrete or wood deck or on a.

A vapor retarder is a material or system that is designed as part of the roof system to substantially reduce the movement of water vapor into the roof system where it can condense. For 30 year warranties see the reflexeon platinumand ultraply 080 membrane information. For roof systems the 2nd law of thermodynamics helps explain why during the cold winter months warm moist interior air e g 75f 50 rh infiltrates up into a roof system that doesn t have a vapor retarder air barrier in the system.