Rigid Insulation Under Garage Slab

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Rigid insulation under garage slab.

Is it worth it to insulate under a concrete slab. If this is the case then the frost will travel down the footing and make the floor cold and thus heat loss. 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. 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.

Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Conclusion with building owners growing desire to save money on heating and cooling costs and increasingly stringent energy codes contractors will be installing below grade and under. I am presuming there is a 4ft deep footing around the perimeter of the garage with no insulation. That decision may hinge on whether the slab is heated but there s no agreement on what building codes require if anything.

Dealing with the edges the foam insulation and two layers of plywood can add as much as 2 inches of height to the garage floor. Using rigid foam insulation around the perimeter of the slab to minimize heat loss seems like an obvious step but whether to place insulation under the slab is another story. Garage door insulation project guide. But when adding insulation to an existing slab the vapor barrier is laid over the top of the slab before the foam insulating panels are installed.

This compliance option is explained this way. In climates zones 4 and 5 and 4 ft. Insulation located below grade as required in climate zones 4 through 8 should extend the length specified in the table by any combination of vertical insulation insulation extending under the slab or insulation extending out perpendicular to the building insulation extending perpendicular away from the building should be protected by. For under slab applications the rigid foam insulation typically should be installed over a gravel base with a poly vapor diffusion retarder between the gravel and insulation.