Vapour Control Layer Roof

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

Vapour control layer roof.

Access hatches to cold roof voids should have. 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 roof is an unventilated warm roof design finished with a single ply membrane. 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.

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. The vapour control layer vcl often overlooked underrated punctured adlib and sometimes even completely omitted mainly because we re just not sure if it really is all it s cracked up to be after all even if we leave it out altogether the roof shouldn t leak right. Using a vapour control layer to control condensation. 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.

Vapour control layers should be provided to warm roofs and. The answer to keeping timber framed walls and roofs dry is to use a layer to restrict the flow of moisture but not to try and stop it. 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. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation.

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. A vcl is always used as close to the inner face of a wall as possible and reduces the amount of moisture passing through the layer to low levels ensuring only insignificant amounts of condensation occur within the structure. This is known as a vapour control layer vcl or a vapour retarder. Used in roof constructions where the ceiling board is fixed to the rafters.

We offer vapour control layers suitable for use in ceiling wall window and roof applications timber frame constructions behind vertical cladding and within metal profile clad industrial buildings. It has transpired that there is no vapour control layer fitted. 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.