Rigid Insulation Under Garage Slab

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.

Rigid insulation under garage slab.

R 7 7 rigid foam insulation model 310891 18 35 18 35. 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. 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. In climates zones 4 and 5 and 4 ft.

I am presuming there is a 4ft deep footing around the perimeter of the garage with no insulation. Is it worth it to insulate under a concrete slab. Garage door insulation project guide. 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.

This compliance option is explained this way. 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. Insulation located below grade shall be extended the distance provided in table n1102 1 1 namely 2 ft. A resource to point them to for example calculations is the article right sizing under slab insulation in the april 2014 issue of structure magazine.

Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. 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. That decision may hinge on whether the slab is heated but there s no agreement on what building codes require if anything. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department.