Vapour Control Layer Warm Roof

A vapour control layer helps you shield your building from the consequences of condensation.

Vapour control layer warm roof.

Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. 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. In simple terms this is a layer on the inner face of the building which is used to reduce moisture flow into and through the walls roof or floor. Reduce heat loss and boost energy efficiency with market leading vapour control layers vapour barrier membrane and vapour control barriers.

This is to prevent damaging levels of condensation occurring in the fabric of the building which in turn would cause decay in timber corrosion in metals or frost damage in masonry. It has transpired that there is no vapour control layer fitted. The roof is an unventilated warm roof design finished with a single ply membrane. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

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. 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. However it is important to note that vapour control layer timber frame membrane must be installed in conjunction with a good ventilation system and membranes. 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.

You ll find pitched roofing products here. Vapour control layers are positioned to the inside of the insulation in order to minimise the amount of warm moist air entering the construction. Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers. Vapour control layers in warmer weather tiles can heat up causing water vapour to form beneath them in the roof cavity.

A vapour control layer is typically installed on the warm side of the insulation to block the warm moist air from entering the roof space.