Warm Flat Roof Vapour Control Layer

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

Warm flat roof vapour control layer.

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. Vapour control layer for a warm roof a vapour layer should be positioned under the insulation or in some situations immediately below the roof covering to minimise water vapour condensing beneath the membrane. Include at least one layer of bitumen roofing membrane s2p3 below the insulation fully bonded or mechanically fixed to the structural deck as appropriate or a suitable self adhesive or torch on membrane. All warm flat roofs must also have a vcl vapour control layer inserted between the top decking and the first layer of insulation.

A vapour control layer helps you shield your building from the consequences of condensation. Flat roofs are among the simplest construction elements that can feature in a building. 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. Because of this the vcl always sits at the warm side of the insulation.

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. A warm roof features a structural deck vapour control layer insulation and waterproofing a tried and tested solution that the industry knows works. Vapour control layer may be formed using any of the following. Vapour control layers should be provided to warm roofs and.

If this has not been done then we would recommend that you install one underneath the joists before the plasterboard goes up. With any warm flat roof detail such as this a vapour control layer should have been laid on top of the roof deck underneath the insulation. Vapour control layers are normally considered essential under insulation in warm roof constructions to reduce the risk of condensation. This can be made of polyethylene membrane bitumen sheet polymeric foil or even be a cheap easy to apply self adhesive sheet.

Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. It s the first line of defence against high vapour pressure air entering the roof structure and causing interstitial condensation. The roof is an unventilated warm roof design finished with a single ply membrane. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation.

It has transpired that there is no vapour control layer fitted.