Insulation Under Concrete Slab Roof

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Insulation under concrete slab roof.

Insulation located below grade shall be extended the distance provided in table n1102 1 1 namely 2 ft. Insulating properly below grade can help prevent total structure heat loss and reduce heating and cooling bills by 10 20. In climate zones 6 7 and 8 by any combination of vertical insulation insulation extending under the slab or insulation extending out from the building. Perimeter slab insulation should cover as much of the exposed concrete as allowed by code.

In climates zones 4 and 5 and 4 ft. Eps 3 xps 2 faced or unfaced. This compliance option is explained this way. 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.

Rigid insulation concrete products like foam sheeting are easily broken and must be used with an extra vapor barrier plus standard foam or polystyrene concrete insulation does not stop radiant heat loss or gain. Under slab 5 more ways to filter. Continuous insulation is applied directly to the slab exterior extending downward from the top of the slab for the distance specified. Faced 2 unfaced 3 insulation features.

Continuous insulation extends downward from the top of the slab and along the entire perimeter and completely covers the entire area under the slab. Historically used as a stable roof insulation eps has gained wide acceptance in wall below grade and under slab applications due to its low moisture absorption strength and stable long term thermal performance. Step 1 excavate the area under the slab to 12 inches below the planned level of the top of the slab. Adding insulation under the concrete floor requires the same skill set and equipment as forming and pouring the concrete slab.

Eps insulation blocks can be custom cut into a variety of shapes and sizes to meet wide ranging job specifications. It can be tempting to cut the insulation at ground level to avoid seeing it but this creates an area for heat to move in or out of the home and there will be heat loss through the floor and foundation if not fully insulated.