Warm Deck Roof Vapour Barrier

If this has not been done then we would recommend that you install one underneath the joists before the plasterboard goes up.

Warm deck roof vapour barrier.

Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here. A vapour barrier will then need to be installed to reduce condensation in the roof structure. Our builders have put a vapour barrier on the upper side of the insulation on a warm deck roof. The vapour control layer is above the decking but below the insulation.

Exceptions to this idea include roofs over indoor swimming pools or other high humidity producing activities and over new concrete roof decks to prevent the moisture in the concrete from drying into the roof system. Including flat roof vapour barrier for extra secure roofing solutions. 22 jan 2010 messages. Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place.

Discussion in builders talk started by fatpiggy12345 sep 24 2020 at 9 39 pm. With any warm flat roof detail such as this a vapour control layer should have been laid on top of the roof deck underneath the insulation. A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building. When we use a vapor retarder in a roof system it will also act as an air barrier as long as it is sealed at all perimeters and.

The insulation is immediately below the waterproofing layer. The insulation can be adhered mechanically fixed or loose laid. This could be a 1000 gauge min polythene sheet. 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.

I am having an extension built and my builder is constructing the flat warm deck roof in the following way. Vapour barrier on warm deck roof.