Vapour Barrier Flat Warm Roof

Including flat roof vapour barrier for extra secure roofing solutions.

Vapour barrier flat warm roof.

A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here. Be it a cold or warm roof construction the primary function of a vcl is to keep warm moist air from inside the building inside the building. If it is not a habitable space or as per the old design for flat cold roofs then you would use foil backed plasterboard which acts as a vb.

For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation. 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. Provided your vapour control layer is intact then there should not be any risk of condensation. A vapour barrier will then need to be installed to reduce condensation in the roof structure.

To use epdm for a warm deck flat roof construction solid closed cell roof insulation such as kingspan or celotex should be placed on top of the roof deck rather than in between the rafters. This video will demonstrate how to install a cure it grp waterproofing system in a warm roof build up. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. If this is a habitable room beneath the roof then you should be constructing a warm roof as per building regulations c l.

There is no requirement for any air gaps. It s the first line of defence against high vapour pressure air entering the roof structure and causing interstitial condensation.