Vapour Barrier For Warm Flat Roof

Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers.

Vapour barrier for warm flat roof.

Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. Vapour control layers at roofing superstore our choice of flat roof materials includes everything you need to create a long lasting weather proof flat roof that performs and looks good too. Ideally you need to ventilate the roof and have a 50mm air gap above your insulation. Vapor barriers are also a cold climate artifact that have diffused into other climates more from ignorance than need.

A vapour barrier sometimes referred to as vapour retarder is typically a plastic or foil sheet used for damp proofing to prevent interstitial condensation from forming in various building assemblies such as walls roofs foundations and floors. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. If it is not a habitable space or as per the old design for flat cold roofs then you would use foil backed plasterboard which acts as a vb. It is frightening indeed that construction practices can be so dramatically.

The history of cold climate vapor barriers itself is a story based more on personalities than physics. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. That reduction of air and moisture infiltration can then help improve roof longevity. The notion behind a vapour control layer is to install it on the room side of the insulation so it stops the passage of warm moist air entering the structure.

Rose 1997 regales readers of this history. 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. A vapour control layer helps you shield your building from the consequences of condensation.