Vapour Control Barrier Flat Roof

If the roof is insulated with foil faced insulation blankets the aluminium side can serve as a vapour barrier at the same time.

Vapour control barrier flat roof. Temporarily waterproofs the roof can stay uncovered for up to 3 months. In this case you need to lay a full vapour barrier on top of your flat roof deck before you lay the insulation and your flat roof covering. The notion behind a vapour control layer is to install it on the room. A vapour control layer helps you shield your building from the consequences of condensation 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 or vcl on a warm flat roof sits between the roof decking and the insulation. Vapour control layers vcl. 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. Why is it the best vapour barrier for flat roofs.

For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation. This is known as. 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. There is no requirement for any air gaps.

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 polythene vapour barrier limits the movement of air and water vapour through a membrane so a vapour control layer is air permeable or vapour permeable. Using a vapour control layer to control condensation. Comparatively a vapour barrier prevents any movement of vapour or air occurring through the building instead of just limiting it to a controlled level.

Self healing if punctured by fixings. Vapour resistance of 2000 mns g. However note that one should seal the seams here as well. The vapour barrier is suitable for both warm and cold deck designs.

Next to that you may also buy a moisture regulating vapour barrier membrane that can manage the damp even better. The vcl also restricts the movement of warm moist air and improves building insulation. Provided your vapour control layer is intact then there should not be any risk of condensation. Its not cheap purchasing it by the role and by the pallet load is cheaper but is a considerable layout.