To insulate a flat roof with a concrete deck we recommend a warm deck construction method where the vapour control layer is sandwiched between the concrete deck and a layer of rigid pir insulation boards.
Concrete roof deck insulation.
Warm green roof a green roof or a living roof is a type of warm roof that is covered with plants or grass on top of a growing medium all planted over the waterproofing layer of the roof.
Hot asphalt is an approved method for attachment on concrete decks and over mechanically attached base sheets on decks workers can nail into such as gypsum wood cementitious wood fiber and lightweight concrete.
A good rigid insulation is insulating concrete which can be mixed and placed on the job.
432 kg m3 to 0 12 btu h ft2 f 0 6 w m2 k for a 4 inch 101 6 mm thick roofdeck.
Hard rocks with a low water absorption rate and weighs approximately 2403 kg m 3 150 lb cf.
There are three recognised designs of flat roof construction.
Hot asphalt also is acceptable for adhering a cover board or subsequent insulation layers over a mechanically fastened base layer.
Fill corrugations of metal decking with insulating concrete to a minimum depth of 3 mm 1 8 inch over top of flutes.
This can be perlite concrete vermiculite concrete concrete made with polystyrene aggregate or cellular concrete.
However when a lightweight structural concrete lwsc roof deck is poured in place it uses significantly more water.
Lwic decks provide high r values increased fire and wind ratings and a built in air barrier increasing the overall performance of the building envelope.
The normal weight concrete employs standard aggregates i e.
Coat concrete roof deck with a slurry of insulating concrete minimum 3 mm 1 8 inch thick.
It is important to make sure that there is at least a 50mm airgap for ventilation above the insulation and the roof deck to prevent condensation occurring.
In the case of a flat roof insulation is usually in the form of either a rigid board above the deck or a fibrous quilt immediately above the ceiling depending on the type of roof construction.
Warm cold and inverted.
Flat roof design guide.
Lightweight insulating concrete lwic is batched on site and used to encapsulate expanded polystyrene insulation to provide permanent roof insulation and slope to drain.