Vapour Barrier For Warm Flat Roof

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

Vapour barrier for warm flat roof.

That reduction of air and moisture infiltration can then help improve roof longevity. 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. 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. Often the vcl in a warm roof is bonded to a timber substrate which helps the integrity however in a warm roof the vcl has two important functions. The history of cold climate vapor barriers itself is a story based more on personalities than physics. Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers.

The vcl is easier to maintain in a warm roof construction as it s generally out the way of the dangers of plasterboard fixings and downlighters. A vapour control layer helps you shield your building from the consequences of condensation. It is frightening indeed that construction practices can be so dramatically. 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. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. 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.