How To Insulate A Concrete Slab Roof

The air gap in the tubes will act a insulation since heat travel through air will be less.

How to insulate a concrete slab roof.

Perimeter slab insulation heat loss through an insulated slab windows 33 roof ceiling 8 slab 15 6 doors 5 walls 39 insulation and fenestration criteria table 402 1 1 insulation and fenestration requirements by componenta climate zone fenestration u factorb skylightb u factor glazed fenestrationb e shgc ceiling r value wood frame wall r value. The chart above is from a house with r 19 walls and an r 40 roof. At a minimum this type of foundation requires vertical perimeter insulation to separate the slab from the stemwall. Continuous insulation is applied directly to the underside of the slab and extends inward horizontally from the perimeter for the distance specified or continuous insulation is applied downward from the top of the slab and then extends horizontally to the interior or the exterior from the perimeter for the distance specified.

After placing the headers and tubes at over the slab pave the roof slab ensure all tubes are placed well and compact with concrete mixture so that after paving the roof will look like a normal concrete floor. 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 first thing to consider when looking into different types of concrete floors is why it s so important to insulate the floor slab. Check out this article for a list of slab edge insulation solutions and episode 125 for my interview with henry edney of maxraft.

Check out the btu loss through the un insulated concrete slab on this house. This will help in two ways. Up to 80 of heat loss in a floor slab occurs around the edges. A second solution would have been placing the slab and then building a sleeper system on top of it to support the floor.

As we build better that slab becomes a larger of the loss of heat. The area between the stemwalls is usually filled with compacted gravel to support the slab. One solution would have been installing rigid insulation under the slab turning it up on the perimeter to form a giant pan and then casting the concrete slab inside the pan. This is for a house with an r 11 insulated slab.