Vapor Barrier For Metal Roof

As the sun s ray heat the steel the heat radiates through the metal but is reflected back out of the roof by the foil side of the vapor barrier.

Vapor barrier for metal roof.

Resistant to foot traffic the engineered composition of v gard provides high resistance to static loading and dynamic impact. As the sun s ray heat the steel the heat radiates through the metal but is reflected back out of the roof by the foil side of the vapor barrier. Single bubble vapor barrier acts as a reflector. In this example although roofs and walls both need similar water vapor barrier properties the roof barrier often needs to be either inflexible or air permeable to prevent being blown away in an updraft caused in a storm.

It is therefore suitable for most roofs. This reflection of the heat eliminates the temperature difference that causes the metal to sweat and drip. Used as an air and vapor barrier direct to metal decking. 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.

Suremb 90tg 120tg base ply. V gard provides an excellent vapor barrier with a vapor resistance value expressed by an sd equivalent air layer thickness of 1 500 m. That reduction of air and moisture infiltration can then help improve roof longevity. A 90 mil sbs modified asphalt base sheet can be used in multiple ply systems as an air and vapor barrier or a temporary roof for up to 60 days.

A roof vapor barrier needs to have different properties to a barrier in a wall or one used to prevent radon permeating through a floor. Single bubble vapor barrier acts as a reflector.