Vapour Barrier Flat Warm Roof

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

Vapour barrier flat warm roof.

Ideally you need to ventilate the roof and have a 50mm air gap above your. The notion behind a vapour control layer is to install it on the room. Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here. For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation.

If this is a habitable room beneath the roof then you should be constructing a warm roof as per building regulations c l. 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. This video will demonstrate how to install a cure it grp waterproofing system in a warm roof build up. It s the first line of defence against high vapour pressure air entering the roof structure and causing interstitial condensation.

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 control layer or vcl on a warm flat roof sits between the roof decking and the insulation. There is no requirement for any air gaps.

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. Because of this the vcl always sits at the warm side of the.