Flat Roof Vapour Control Barrier

Flat roof vapour barrier materials when constructing a flat roof there are two types of materials commonly used.

Flat roof vapour control barrier.

Vapour control layer for a cold roof. Vapour control layers vcl. A flat roof vapour barrier such as iko s mvp modified vapour protector offers appropriate moisture protection. 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.

There is no requirement for any air gaps. 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. However the cross ventilation does not completely remove the moisture vapour in the ceiling void and a vapour control layer sealed at joints and penetrations is required under the insulation and over the plasterboard to provide a barrier against moisture vapour rising up from the room below. The notion behind a vapour control layer is to install it on the room.

Vapour resistance of 2000 mns g. We provide a vapour control layer for flat roof installations as well as heavy duty vapour control layers for a warm flat roof. For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation. Bituminous vapour retarders asphalt mixed with felt or fiberglass or non bituminous vapour retarders plastic.

Why is it the best vapour barrier for flat roofs. Self healing if punctured by fixings. 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. Its not cheap purchasing it by the role and by the pallet load is cheaper but is a considerable layout.

Comparatively a vapour barrier prevents any movement of vapour or air occurring through the building instead of just limiting it to a controlled level. Temporarily waterproofs the roof can stay uncovered for up to 3 months. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place.