Vapour Control Layer Warm Roof

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.

Vapour control layer warm roof.

In warmer weather tiles can heat up causing water vapour to form beneath them in the roof cavity. It has transpired that there is no vapour control layer fitted. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. Placed on the warm side of insulation used in roof constructions where the ceiling board is fixed to the rafters.

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. 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. 20 year system a primer sopradere quick b vapour control layer sopravap alu activa 2 c insulation adhesive coltack evolution ca.

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. A vapour control layer helps you shield your building from the consequences of condensation. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. The roof is an unventilated warm roof design finished with a single ply 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. Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers. 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 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. 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. We re proud to bring you a range of choice from novia s excellent dual use foil tape to powerlon s ultrablock air barrier and plenty more besides. We provide a vapour control layer for flat roof installations as well as heavy duty vapour control layers for a warm flat roof.

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. This can be made of polyethylene membrane bitumen sheet polymeric foil or even be a cheap easy to apply self adhesive sheet.