Let me just mention that the flat roof as a motif certainly predates 1933.
Insulating flat concrete roof from inside.
The insulation will quickly become saturated with water and cease to be effective.
Advantages by insulating the roof from the inside you can avoid damp problems.
The concrete deck can offer greater speed of roof construction which is an important consideration on many larger commercial projects.
The material that works best depends largely upon preference in a given situation.
Flat roof systems consist of a supp.
Creating a void between the old ceiling and new is better but ideally you need to eventually consider insulating the top of the concrete roof with solid insulation and a better covering grp or epdm.
Flat concrete roofs are generally not ventilated since the ceiling internally is generally a plaster and skim coat directly to the underside of the cold concrete.
Why not put the insulation inside.
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.
After all it s easier to get at.
In fact insulation from the inside will inevitably lead to the formation of condensation caused by the humidity present inside the building.
A vapour barrier is attached to the insulation material in order to prevent condensation and molding.
Careful detailing at the edge and parapet areas of a flat roof is vital for reliability and durability.
If insulation is being added to an older building then it is common practice for the ceiling itself to be taken down.
Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane.
Now you might say why not put the insulation under the ceiling.
The supports will rot if they are made of wood or rust if they are of reinforced concrete.
You can expect to pay about 55 100 sq ft.
For a 1 inch board equivalent of 6 r value.
This will enable the airflow to circulate freely.
We recommend having at least 20 r value worth of material for optimal energy efficiency.
While expensive the best insulation is polyiso rigid foam.
Keep in mind however that you will lose some space in the room by insulating the roof on the inside.
The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation.
Gropius and le corbusier in the 20s sought to capture the machine age by using industrial style roofs.
Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses.
Flat roof hello there s a lot of good material in this post for comment.
