Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge.
Hot flat roof insulation.
Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof.
For a 1 inch board equivalent of 6 r value.
Flat roofs for example on extensions bathrooms and dormer windows are not the best of ideas.
Unconditioned attics require more insulation as the temperature in the attics can easily top 140 in most areas of the country during the summer.
At least 100mm of rigid board insulation must be positioned on top of the vapour control layer the vapour control layer stops any moisture within the building contaminating the insulation.
It also lets hot air escape in the summer.
It is top quality and the most cost effective product for your flat roof.
Fire resistant treated insulation is made with 85 recycled material that meets a class 1 fire rating to protect your home and give you more time to evacuate.
While some try to do this with fiberglass or cellulose their efforts are for naught and quite simply it is not allowed by any legitimate building code out there.
Warm roofs offer a superior thermal performance and therefore come with a higher cost.
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.
Ventilation is necessary to allow moisture accumulated inside to escape.
Unfortunately too many dwellings suffer from this problem.
Doing this protects those layers underneath from the extreme weather elements.
The benefits of a conditioned attic.
A hot roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing.
You can expect to pay about 55 100 sq ft.
We recommend having at least 20 r value worth of material for optimal energy efficiency.
This is then covered with a further weatherproofing layer.
With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters.
If moisture has nowhere to go it will gather around joists and eventually undermine the insulation.
The effective roof insulation layer may range in thickness from 3 to 12 cm as needed.
Flat roofs do not have eaves so there are no soffits holes on the underside to allow air flow.
Cold roof a very bad idea.
Although cold roof systems were used extensively in the past they are now considered out of date and are highly inadvisable.
The process starts by laying 100mm or more of rigid board insulation on top of the waterproof roof membrane.
Greenfiber blow in cellulose insulation fills gaps and voids to create an energy saving thermal blanket that can lower heating and cooling costs by 25 and reduce sound power by 60.
To produce a hot roof rigid insulation is fitted outside above the weatherproofing.
They lose loads of heat and are prone to leaking causing the materials to deteriorate.
Warm deck insulation warm roof as the diagram shows this involves putting in the insulating materials on top of the roof.
Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick.
