Warm Flat Roof Vs Cold Flat Roof

There is no air.

Warm flat roof vs cold flat roof.

When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof. A ventilation gap usually. Your two main options for effective insulation of your property are a cold flat roof or warm flat roof design. Firstly there are two types of flat roof.

On a flat roof this could be air in at. A warm roof has many benefits over a cold roof installation. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. The roof itself is therefore kept warm.

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. 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. You create a warm roof or a cold roof simply by applying the layers of the roof in a different order. A flat roof installation due to the warm air being held below the solid surface of the roof does not need to be ventilated.

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. Namely the insulation layers. 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. 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. Basically there are two options to choose from when insulating a flat roof. Guidance advice on warm cold roofs www cncbuildingcontrol gov uk continuous 5mm gap at ridge. What is a warm roof or a cold roof.

It is more thermally efficient and despite its higher cost of construction lessens overall heating costs thus saving money over the long run. A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck.