Vapour Control Layer Roof

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.

Vapour control layer roof.

Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. Access hatches to cold roof voids should have. 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. A vapour control layer helps you shield your building from the consequences of condensation.

Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. 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. 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. This is known as a vapour control layer vcl or a vapour retarder.

Using a vapour control layer to control condensation. 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 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 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. Vapour control layers are positioned to the inside of the insulation in order to minimise the amount of warm moist air entering the construction. 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.

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. 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.