We recommend having at least 20 r value worth of material for optimal energy efficiency.
Hot flat roof insulation.
Cold roof a very bad idea.
Flat roofs do not have eaves so there are no soffits holes on the underside to allow air flow.
Ventilation is necessary to allow moisture accumulated inside to escape.
For a 1 inch board equivalent of 6 r value.
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.
Warm deck insulation warm roof as the diagram shows this involves putting in the insulating materials on top of the roof.
Doing this protects those layers underneath from the extreme weather elements.
Although cold roof systems were used extensively in the past they are now considered out of date and are highly inadvisable.
This is then covered with a further weatherproofing layer.
Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick.
A hot roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing.
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.
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 is top quality and the most cost effective product for your flat roof.
The effective roof insulation layer may range in thickness from 3 to 12 cm as needed.
If moisture has nowhere to go it will gather around joists and eventually undermine the insulation.
Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof.
To produce a hot roof rigid insulation is fitted outside above the weatherproofing.
It also lets hot air escape in the summer.
Warm deck flat roof insulation is now the standard way to insulate a flat roof click to enlarge.
Proper ventilation in flat roofs.
You can expect to pay about 55 100 sq ft.
Warm roofs offer a superior thermal performance and therefore come with a higher cost.
They lose loads of heat and are prone to leaking causing the materials to deteriorate.
Unconditioned attics require more insulation as the temperature in the attics can easily top 140 in most areas of the country during the summer.
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.
Installing a warm roof can be extremely straight forward and simple to do.
With a warm roof the insulation is installed on top of the existing surface rather than in between the rafters.
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.
The benefits of a conditioned attic.
