The solution warm deck insulation.
Warm deck flat roof insulation.
This is placed over the roof joists and a board normally external ply is laid on top.
This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system.
So called because the insulating layer is located above the roof rafters and between the structural supports a warm deck roof results in a temperature for the roof and loft area that is consistent with the rest of the.
Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to space labour costs etc.
A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.
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.
The layer of insulation is essentially placed outside of the roof.
We also have insulation boards suitable for more specialist roof applications for example inverted roof insulation and balcony insulation.
In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction.
Or above the roof deck where overall roof height may need to be considered if a warm roof construction is desired.
The best method of insulating a flat roof is by using a warm deck flat roof construction method.
If you put insulation under the decking and between the joists you lower the temperature of the decking and lower the due point thus bringing it closer to the danger point of being in the building.
Thickness varies according to the manufacturer s specifications.
Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation.
Flat roof insulation.
The main advantage of a warm deck construction versus a cold deck construction is that there is no need to include a ventilated cavity in the warm deck construction.
Warm flat roofs do not need to be ventilated as the insulation is.
The recognised flat roof build ups for best design practices are.
We have a wide range of roof insulation products including flat roof insulation tapered insulation and pitched roof loft insulation.
Fortunately these days there is a better form of insulation available for your flat roof.
The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible.
It also provides better thermal performance and makes it easier to eliminate thermal bridging.
