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These codes do not require any insulation for slabs that are more than 12 in.
Floor slab insulation detail. The insulation phase is crucial for a radiant floor. Installing slab insulation around the perimeter of the slab will reduce heat loss and make the slab easier to heat. A plywood bottom plate helps to stabilize the double stud wall. Any cooler surface in contact with the slab will try to steal its heat.
Illustration by chris roche. Remember that your slab will be about 75 degrees f. Additionally a layer of rigid foam is used between the framing and ventilation space behind the brick cladding. In this insulation detail at the perimeter of the slab a total of 6 inches of rigid foam insulation separates the interior slab from the outdoors.
Mainly heated slabs radiate outward rather than downward so insulation on the edges of the slab is most important. Rigid insulation is placed horizontally under the slab perimeter and vertically in the joint at the slab edge. This technique can limit inward vapor movement when the sun shines on damp bricks. If headroom is tight then the only option may be to break up the existing slab dig further down and build up an entirely new floor.
Below grade need vertical insulation at the slab perimeter. 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. 4 10 2012 3 climate zones e301 1 6 5 8 4 slab r value table 402 1 1 insulation and fenestration requirements by component e402 1 1 climatezone slab r valued 4 10 2 ft 5 10 2 ft 6 10 4 ft 9. The codes are silent about whether above grade slabs need to be insulated.
In new hampshire chris roche is pulling together plans for a new energy efficient home. Otherwise both codes require that slab on grade floors with a floor surface less than 12 in. Such spaces typically have a sound level concrete slab floor but lack sufficient floor insulation to achieve the thermal performance targets for new habitable rooms.
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