Warm Deck Flat Roof Vapour Barrier

For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation.

Warm deck flat roof vapour barrier.

Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. Not only is a vapour barrier or vapour control layer vcl a vital component of the roof it must also be correctly positioned. A vapour control layer helps you shield your building from the consequences of condensation. Vapour control layers vcl.

To construct a mechanically fixed warm deck using epdm you will require. Provided your vapour control layer is intact then there should not be any risk of condensation. 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. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

Because of this the vcl always sits at the warm side of the insulation. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. If the basic warm roof construction is followed before extra insulation is installed problems can arise. There is no requirement for any air gaps.

The architect plans stated requirement for a vapour control layer below the insulation or a 3 in 1 insulation board including vapour control layer and an additional foil backed plasterboard. The buildup of a warm flat roof starts with a good vapour barrier followed by insulation then more decking or just the roofing materials depends on if you want the roof soft or solid. It s the first line of defence against high vapour pressure air entering the roof structure and causing interstitial condensation. On the warm internal side of all the insulation.

Be it a cold or warm roof construction the primary function of a vcl is to keep warm moist air from inside the building inside the building.