Vapour Control Layer Warm Roof

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

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. The roof is an unventilated warm roof design finished with a single ply membrane. Vapour control layers in warmer weather tiles can heat up causing water vapour to form beneath them in the roof cavity. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation.

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. Reduce heat loss and boost energy efficiency with market leading vapour control layers vapour barrier membrane and vapour control barriers. 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.

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

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. 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. You ll find pitched roofing products here. Vapour control layers should be provided to warm roofs and.

Much like the cold roof it stops the transfer of warm moist air from inside the building into the warm roof layers.