Including fibreglass roof kits torch on felt and liquid rubber products everything you need for flat roofing is in one place.
Vapour control layer pitched roof.
However warm moist air by its very nature will always find the passage of least resistance so the use of roof membranes and ventilation will effectively manage the small.
Non ventilated pitched roof systems that use tyvek as roofing underlay satisfy the requirement of approved.
Below the roof pitch is the ceiling joists that will get 300mm soft insulation.
Do i need a vcl in the loft to the under side of rafters or will the condensation disappear once the ceiling is gyproced and the.
Bs6229 2003 gives advice on vapour control layers in flat roofs and the control of condensation within the building generally.
The job of a vapour control layer or vcl reduces the water vapour transfer through any building and reduces the risk of condensation forming.
To solve this we recommend installing an air vapour control layer avcl such as dupont airguard control smart or dupont airguard reflective beneath the vapour open quilt insulation.
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.
Non ventilated pitched roof systems that use tyvek as roofing underlay satisfy the requirement of approved document c2.
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Vapour control layers vcl.
The notion behind a vapour control layer is to install it on the room.
At roofing superstore our choice of flat roof materials includes everything you need to create a long lasting weather proof flat roof that performs and looks good too.
To solve this we recommend installing an air vapour control layer avcl such as duponttm airguard control beneath the vapour open quilt insulation.
A vapour control layer or vcl on a warm flat roof sits between the roof decking and the insulation.
This is done by installing it on the inner side of the insulation for example in a pitched roof this would sit beneath the layer of insulation that has been installed between the rafters.
Superfoil sf19 vapour control thermal insulation multi layer 1 2m x 10m 12sqm 69 17 ex vat 83 00 inc vat protect vc foil ultra vapour control layer 1 5m x 50m with integrated tape.
The roof is covered with high water vapour resistant type hr underlay and the pitch exceeds 35 or the span exceeds 10m this is in addition to eaves ventilation.
The idea behind a vapour control layer is to install it on the room side of the insulation so it blocks the passage of warm moist air rising into the pitched roof structure.
Where high water vapour resistant type hr underlay e g.
