Vapour Control Layer Roof

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 layer roof.

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. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. 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.

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. 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. 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.

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

Access hatches to cold roof voids should have. It has transpired that there is no vapour control layer fitted. Vapour control layers should be provided to warm roofs and. 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.

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. 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. Used in roof constructions where the ceiling board is fixed to the rafters.