Insulating Flat Concrete Roof From Inside

The concrete deck can offer greater speed of roof construction which is an important consideration on many larger commercial projects.

Insulating flat concrete roof from inside.

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 roof systems consist of a supp. Flat roof hello there s a lot of good material in this post for comment. After all it s easier to get at.

Many millions of square meters of flat roof are not yet green this means wasting an enormous potential of living space. In fact insulation from the inside will inevitably lead to the formation of condensation caused by the humidity present inside the building. While expensive the best insulation is polyiso rigid foam. Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane.

Gropius and le corbusier in the 20s sought to capture the machine age by using industrial style roofs. You can expect to pay about 55 100 sq ft. Why not put the insulation inside. This will enable the airflow to circulate freely.

We recommend having at least 20 r value worth of material for optimal energy efficiency. A vapour barrier is attached to the insulation material in order to prevent condensation and molding. The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses.

Advantages by insulating the roof from the inside you can avoid damp problems. Careful detailing at the edge and parapet areas of a flat roof is vital for reliability and durability. Keep in mind however that you will lose some space in the room by insulating the roof on the inside. Now you might say why not put the insulation under the ceiling.

For a 1 inch board equivalent of 6 r value. 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. 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. The supports will rot if they are made of wood or rust if they are of reinforced concrete.

If insulation is being added to an older building then it is common practice for the ceiling itself to be taken down. Let me just mention that the flat roof as a motif certainly predates 1933. When you insulate a flat roof it is important that moisture or air are kept well out all around.