The structural deck and the supporting structure are at a temperature close to the interior of the building.
Warm or cold roof.
Warm roof construction requires that the entire roof construction is encapsulated within the insulation envelope of the building to be kept warm.
The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing.
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 warm roof construction has many benefits over a traditional cold roof essentially it is a breathable roof.
Ventilation is required for these roofs.
What is a warm roof or a cold roof.
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.
A hot unvented roof requires that you pay meticulous attention to air sealing the attic.
Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch 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.
What s more cost effective.
A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.
However you may not be familiar with these concepts particularly what they mean and the pros and cons of each.
Hot roofs or cold roofs.
It is usually the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction.
A warm roof building will make the entire structure of the building warm in an attempt to avoid any cold bridging.
In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm.
It has s insulation layer above the rafters and immediately below its weatherproof membrane.
Depending on the quality of the insulation hot air from outside can permeate the insulation and warm the conditioned space raising energy bills and making hvac units work overtime.
On flat roofs the insulation layer of a warm roof is usually on the outer surface of the roof structure.
A warm roof is much more straightforward to install and provides a superior thermal performance and is therefore more costly.
Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.
The breakdown warm roof vs cold roof.
Warm roofs and cold roofs can take different forms depending on the nature of the roof form.
You create a warm roof or a cold roof simply by applying the layers of the roof in a different order.
