Converting a cold flat roof into a modern warm deck roof can be surprisingly economical.
Warm deck roof cold deck roof.
The layer of insulation is essentially placed outside of the roof.
Warm roof designs will make the entire structure of the building warm in order to avoid cold bridging an element of the building that allows heat or energy loss.
The solution warm deck insulation.
Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.
By moving the insulation to the outside of the structure the roof deck is effectively brought inside which results in a warm deck hence the name this removes the the possibility of condensation forming on the underside of the deck and eliminates damp.
Ventilation is required for these roofs.
A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.
The breakdown warm roof vs cold roof.
Fortunately these days there is a better form of insulation available for your flat roof.
Guidance advice on warm cold.
This cold deck construction is considered problematic in the humid temperate climate of the uk where the effective ventilation of restricted roof voids may be impractical particularly in sheltered built up areas.
After cleaning preparing the existing roof we install an insulation layer on top creating a thermal envelope with the old roof as the.
This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system.
The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck usually with a vapour control layer underneath the insulation.
Contrasted with the cold deck roof this construction has a much lower risk of condensation as the void will be of a comparable temperature to the roof.
A cold roof design usually leaves a 50mm gap between the top of the insulation and the roof deck above.
However this also allows cold air to enter.
A cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.
This video will demonstrate how to install a cure it grp waterproofing system in a warm roof build up.
Warm deck flat roof.
The thermal efficiency isn t as good as with warm roof.
It is universally recommended that cold deck flat roof construction should be avoided.
Provided the existing roof is in a good state of repair and has a suitable structure a warm deck overlay can be applied.
