Warm Flat Roof Cold Flat Roof

What is a warm roof or a cold roof.

Warm flat roof cold flat roof.

It is more thermally efficient and despite its higher cost of construction lessens overall heating costs thus saving money over the long run. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof. 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. 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.

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. On a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through rising thermal pressure lower down in the building. You create a warm roof or a cold roof simply by applying the layers of the roof in a different order. 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.

A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. If an existing cold roof is to be refurbished consideration should be given to converting the design to a warm roof or incorporating new insulation into the roofing system to improve thermal performance. 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. Your two main options for effective insulation of your property are a cold flat roof or warm flat roof design.

The vapour control layer is above the decking but below the insulation. The insulation is immediately below the waterproofing layer. Namely the insulation layers. Cold bridging occurs when there is a continuous path created through the insulation.

The breakdown warm roof vs cold roof. A warm roof has many benefits over a cold roof installation. A warm roof is much more straightforward to install and provides a superior thermal performance and is therefore more costly. Warm roof built up roof a warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.