Fortunately these days there is a better form of insulation available for your flat roof.
Warm deck 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.
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.
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.
The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible.
Thickness varies according to the manufacturer s specifications.
Warm flat roofs do not need to be ventilated as the insulation is.
Inverted roofs are a type of warm flat roof where the insulation is above the waterproofing layer.
This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system.
The layer of insulation is essentially placed outside of the roof.
A wide range of applications across flat roofs whether you re looking to insulate at joist level or above the roof deck in your flat roof construction.
We have a wide range of roof insulation products including flat roof insulation tapered insulation and pitched roof loft insulation.
A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.
Good question theoretically when building a warm roof the vaper control layer goes on the warm side of the insulation.
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.
The recognised flat roof build ups for best design practices are.
Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.
We also have insulation boards suitable for more specialist roof applications for example inverted roof insulation and balcony insulation.
The best method of insulating a flat roof is by using a warm deck flat roof construction method.
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.
This is placed over the roof joists and a board normally external ply is laid on top.
It also provides better thermal performance and makes it easier to eliminate thermal bridging.
Flat roof insulation.
