Warm Or Cold Flat Roof

Warm roof construction requires that the entire roof construction is encapsulated within the insulation envelope of the building to be kept warm.

Warm or 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. Guidance advice on warm cold roofs www cncbuildingcontrol gov uk continuous 5mm gap at ridge. What is a warm roof or a cold roof. However you may not be familiar with these concepts particularly what they mean and the pros and cons of each.

This means that the insulation should be highly resistant to water absorption for example an extruded polystyrene based product which will not be affected by water or repeated freeze thaw cycles. If you have been considering a new roof installation looking into adding insulation to your home or are planning to build a new house you may have heard people talk about hot roof and cold roof systems. 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. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.

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. A warm roof is much more straightforward to install and provides a superior thermal performance and is therefore more costly. 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.

The breakdown warm roof vs cold roof. You create a warm roof or a cold roof simply by applying the layers of the roof in a different order. The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing.