Hopefully this video will help explain the difference between warm flat roof construction and cold flat roof construction.
Celotex warm roof construction details.
This video shows detailed drawing.
A fully warm roof construction is recommended and where this is not practical a cold roof can also be considered.
If the roof has insulation over the joists warm roof construction and you choose to insulate the underside of the joists steps would need to be taken to make sure that the required ventilation.
Celotex offer pir thermal insulation boards in various thicknesses for new build and refurbishment applications for both the commercial and domestic sectors.
A warm roof does not need cross ventilation and lends itself to better detailing at junctions with other elements to address linear thermal bridging.
In the opinion of celotex a hybrid solution presents an unacceptable risk of harmful condensation and should be avoided by building designers.
For all updates and celotex announcements since june 2017 please see the links below.
Saint gobain construction products uk limited trading as celotex registered in england.
Insulation uk polyisocyanurate pir foam boards are lightweight.
These boards offer a quick and easy way to achieve effective thermally insulated flat roof decks for building structures such as small extensions or garage roofs where there will only be occasional traffic.
Width 1200mm length 2400mm.
A warm roof design with the insulation laid over the structural timbers remains the preferred option to a cold roof design.
Tel 44 0 1473 822093.
The roof will need to be checked to see if there is any insulation either within the joists or on top of the joists as a warm roof construction.
Width 1200mm length 2400mm.
Product name thickness range sizes lambda bba.
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