Warm Flat Roof Construction Vapour Barrier

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Pin On Tiny Homes

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Warm Deck Roof Design With Visqueen Polythene Vapour Barrier And Mechanically Fixed Insulation Flat Roof Construction Flat Roof Roof Deck

Grp insulated decking board ecotherm insulation 120mm with 6mm ply attached firrings joists plasterboard i have read that i need a vapour barrier.

Warm flat roof construction vapour barrier.

I am having an extension built and my builder is constructing the flat warm deck roof in the following way. For all warm flat roofs a fully intact vapour barrier would be required on the room side under the insulation. 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. Condensation within a flat roof mainly occurs during cold weather when moisture vapour in the air which has been generated within the heated building rises from the room below into the cold roof void above the ceiling.

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. Where in the roof construction should this be installed. A vapour control layer helps you shield your building from the consequences of condensation.

There is no requirement for any air gaps. A vapour barrier will then need to be installed to reduce condensation in the roof structure. When the temperature of the vapour falls to or below its dew point the water vapour condenses on cold surfaces. The buildup of a warm flat roof starts with a good vapour barrier followed by insulation then more decking or just the roofing materials depends on if you want the roof soft or solid.

Because of this the vcl always sits at the warm side of the insulation. A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation. 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.

If this is a habitable room beneath the roof then you should be constructing a warm roof as per building regulations c l. I was looking to use this vapour barrier from screwfix but not sure if it s suitable for the job it only mentions underfloor heating and laminate flooring in the description. Ideally you need to ventilate the roof and have a 50mm air gap above your insulation.

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County Flat Roofing Flat Roof Insulation Contractor Teknologi

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Https Encrypted Tbn0 Gstatic Com Images Q Tbn 3aand9gctphzkqnqc49qokf3mhm6sa3xnlcta980t5u17hrmrdkz7dyvm6 Usqp Cau

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Pin On March Unit 13

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Joining Flat Roof To Pitched Roof Google Search

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