The insulation material for a warm flat roof should.
Flat warm roof insulation.
You can expect to pay about 55 100 sq ft.
With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters.
Increase your r value by layering insulation.
While warm flat roof design has become more popular to help achieve ever stringent thermal performance modern roof structures are often required to also provide a level of sound insulation and fire protection.
These are can be supplied with rebated edges which interlock reducing the risk of uplift.
The insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre.
They lose loads of heat and are prone to leaking causing the materials to deteriorate.
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.
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.
While expensive the best insulation is polyiso rigid foam.
Flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas.
If you live in a warm climate you require a lower r value.
Unfortunately too many dwellings suffer from this problem.
Cold areas require a higher r value like an r 49.
Layer more insulation over the old for more effectiveness.
It is top quality and the most cost effective product for your flat roof.
A warm flat roof is defined by where the roof insulation is installed which is always above the roof deck.
Warm roofs offer a superior thermal performance and therefore come with a higher cost.
The format of house insulation you need depends on where you put it and if you need to control.
The vapour control layer is above the decking but below the insulation.
The great thing about a warm roof is that if your existing roof surface is in good condition you don t need to do much to it.
We recommend having at least 20 r value worth of material for optimal energy efficiency.
Warm flat roofs do not need to be ventilated as the insulation is above the structure.
The recognised flat roof build ups for best design practices are.
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.
One of the main benefits you will receive from installing a warm flat roof is condensation will not become an issue because of the positioning of the insulation.
The insulation is immediately below the waterproofing layer.
A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.
