Cold Flat Roof Vs Warm Flat Roof

What is a warm roof or a cold roof.

Cold flat roof vs warm flat roof.

Installing a warm roof can be extremely straight forward and simple to do. A ventilation gap usually. In a cold roof the insulation is applied between the rafters but in a warm roof the insulation is applied on top of the existing roof surface. Firstly there are two types of flat roof.

There is no air. The roof itself is therefore kept warm. A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck. Namely the insulation layers.

You create a warm roof or a cold roof simply by applying the layers of the roof in a different order. Basically there are two options to choose from when insulating a flat roof. A flat roof installation due to the warm air being held below the solid surface of the roof does not need to be ventilated. It is more thermally efficient and despite its higher cost of construction lessens overall heating costs thus saving money over the long run.

Guidance advice on warm cold roofs www cncbuildingcontrol gov uk continuous 5mm gap at ridge. By majority the rule of thumb is that in a domestic house not flats approximately a third of. The breakdown warm roof vs cold roof. Your two main options for effective insulation of your property are a cold flat roof or warm flat roof design.

A warm roof has many benefits over a cold roof installation. Cncd 053 v1 5 7 2019 0 cold deck flat roof the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. Cold roof construction requires that a suitable ventilated air space exists above the insulation layer within which the air is constantly mobile being replenished by fresh incoming air whilst the air resident within the void space is being expelled via a natural vent action at another point. Whilst cold flat roofs were the most commonly used method of insulation changes in the way we live increased time spent inside an increase in internal washing and cooking areas meant that the additional water vapour needed.

A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.