Vapour Control Layer Roof

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

Vapour control layer roof. 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. 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. 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. 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.

This is known as a vapour control layer vcl or a vapour retarder. 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 or vcl on a warm flat roof sits between the roof decking and the insulation. 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.

Access hatches to cold roof voids should have. Condensation is generated when warm moist air rises and condenses into a liquid on contact with the cooler areas above the insulation. Vapour control layers are positioned to the inside of the insulation in order to minimise the amount of warm moist air entering the construction. 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.

Vapour control layers at roofing superstore our choice of flat roof materials includes everything you need to create a long lasting weather proof flat roof that performs and looks good too. 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. The roof is an unventilated warm roof design finished with a single ply membrane. Using a vapour control layer to control condensation.

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