Vapour Control Layer Warm Roof

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.

Vapour control layer warm roof.

In warmer weather tiles can heat up causing water vapour to form beneath them in the roof cavity. Reduce heat loss and boost energy efficiency with market leading vapour control layers vapour barrier membrane and vapour control barriers. Vapour control layers are positioned to the inside of the insulation in order to minimise the amount of warm moist air entering the construction. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

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. Breather membranes are positioned to the outside of the insulation acting as a weather barrier while still allowing moisture particles to escape from the inside. 20 year system a primer sopradere quick b vapour control layer sopravap alu activa 2 c insulation adhesive coltack evolution ca.

The roof is an unventilated warm roof design finished with a single ply membrane. Placed on the warm side of insulation used in roof constructions where the ceiling board is fixed to the rafters. This can be made of polyethylene membrane bitumen sheet polymeric foil or even be a cheap easy to apply self adhesive sheet. 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.

Where the ceiling below a cold pitched roof includes a vapour control layer the design should ensure adequate ventilation is provided to the habitable areas to prevent condensation problems in the home. 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 is designed to catch this vapour preventing it from condensing on the insulation or elsewhere in the loft space or attic. A vapour control layer helps you shield your building from the consequences of condensation.

Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers. Warm roof with vapour control layer field area upstand bituminous waterproofing. We provide a vapour control layer for flat roof installations as well as heavy duty vapour control layers for a warm flat roof. 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.

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. You ll find pitched roofing products here.