Warm Flat Roof Vs Cold Flat Roof

I have a flat roof that is a cold roof.

Warm flat roof vs cold flat roof.

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. A flat roof installation due to the warm air being held below the solid surface of the roof does not need to be ventilated. The breakdown warm roof vs cold roof a cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. Rigid type insulation just above the ceiling 3 4 gap and then plywood decking on top.

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 to be addressed. A warm roof is much more straightforward to install and provides a superior thermal performance and is therefore more costly. You create a warm roof or a cold roof simply by applying the layers of the roof in a different order. There is no air space between the roof and the warm air thus there is no condensation.

On a flat roof this could be air in at. In the winter condensation forms on the ceiling and sometimes causes a dripping into the room. Namely the insulation layers. The thermal efficiency isn t as good as with warm roof insulation.

It is more thermally efficient and despite its higher cost of construction lessens overall heating costs thus saving money over the long run. Your two main options for effective insulation of your property are a cold flat roof or warm flat roof design. A cold roof is best when you re initially creating a flat roof and is cheaper than a warm roof but does provide an inferior thermal performance. This design dates back many years and flat roof insulation was somewhat of an afterthought with this type of roof.

Warm deck roof a warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. 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. No ventilation is required for these types.