Vapour Barrier Flat Warm Roof

The notion behind a vapour control layer is to install it on the room.

Vapour barrier flat warm roof.

Because of this the vcl always sits at the warm side of the. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place. Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here.

There is no requirement for any air gaps. Ideally you need to ventilate the roof and have a 50mm air gap above your. A vapour barrier will then need to be installed to reduce condensation in the roof structure. It s the first line of defence against high vapour pressure air entering the roof structure and causing interstitial condensation.

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. 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. This video will demonstrate how to install a cure it grp waterproofing system in a warm roof build up. Provided your vapour control layer is intact then there should not be any risk of condensation.

If this is a habitable room beneath the roof then you should be constructing a warm roof as per building regulations c l. 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.