Warm Deck Roof Vapour Barrier

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.

Warm deck roof vapour barrier.

22 jan 2010 messages. Discussion in roofing and guttering started by sam85 21 jul 2017. Discussion in builders talk started by fatpiggy12345 sep 24 2020 at 9 39 pm. The vapour control layer is above the decking but below the insulation.

Our builders have put a vapour barrier on the upper side of the insulation on a warm deck roof. Whether you re repairing a flat roof or laying a new one from scratch you ll find all the materials you need here. This could be a 1000 gauge min polythene sheet. Vapour barrier on warm deck roof.

I believe this is wrong as it should be on the lower side warm side. I am having an extension built and my builder is constructing the flat warm deck roof in the following way. A vapour barrier will then need to be installed to reduce condensation in the roof structure. Warm deck flat 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. 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. The insulation can be adhered mechanically fixed or loose laid. 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.

The insulation is immediately below the waterproofing layer. 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.