Warm Deck Roof Cold Deck Roof

The breakdown warm roof vs cold roof.

Warm deck roof cold deck 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. Converting a cold flat roof into a modern warm deck roof can be surprisingly economical. A cold roof design usually leaves a 50mm gap between the top of the insulation and the roof deck above. The simplicity of a warm flat roof makes it one of the most popular designs providing an effective and easy way of insulating a building.

This allows air to circulate. A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. 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. 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.

Fortunately these days there is a better form of insulation available for your flat roof. The solution warm deck insulation. This video will demonstrate how to install a cure it grp waterproofing system in a warm roof build up. 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.

Provided the existing roof is in a good state of repair and has a suitable structure a warm deck overlay can be applied. This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system. 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. Ventilation is required for these roofs.

The layer of insulation is essentially placed outside of the roof. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. Guidance advice on warm cold.

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. Warm deck flat roof. The thermal efficiency isn t as good as with warm roof.