Slab On Grade Floor Insulation

The insulation phase is crucial for a radiant floor.

Slab on grade floor insulation. For comfort and to save money that s why. Yes you can build a slab on grade with a radiant heated floor and have an attached unheated screen porch on the same slab you just need to be sure to insulate between the heated and unheated portions. Insulation requirements for slab on grade floors can be found in section r402 2 9 of the 2012 iecc and section n1102 2 9 of the 2012 irc. The compacted aggregate base is first followed by a 6 mil polyethylene vapor barrier then insulation then rebar or wire mesh or both.

Figures 4 12 through 4 14 show variations where the slab is the primary location for insulation. 4 2 slab on grade construction details. Mainly heated slabs radiate outward rather than downward so insulation on the edges of the slab is most important. In this section several typical slab on grade sections are illustrated and described.

R 20 insulation 1 2 gyp. Slab on grade floors with a floor surface less than 12 inches below grade should be insulated in accordance with information provided in the insulation and fenestration requirements by component table which is reproduced following this paragraph. This is not the easiest thing to accomplish with a hand made slab but a company that supplies prefab slab on grade kits legalett can easily. Asphalt impregnated stucco over tyvek building wrap weep.

For monolithic slab and footing the insulation must extend only to the bottom of the. The rated r value of insulation shall be installed around the perimeter of the slab on grade floor to the distance specified. 2015 iecc irc section r402 2 10 n1102 2 10 slab on grade floors. Floor system see 1 2 expansion joint typical slab on grade floor system.

Why insulate under a slab on grade foundation. R 15 scored squared edge rigid foam board insulation sheathing model 9gb view the owens corning basement and crawlspace insulation. Foamular foamular 250 3 in. Figures 4 9 through 4 11 and 4 15 show configurations with insulation on the exterior surface of the foundation.

Regarding the rated r value of insulation on slab on grade floors. Insulating below slab on grade foundations. As clarified in appendix a of standard 90 1 2016. Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation.