Rigid Insulation Below Slab

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Rigid insulation below slab.

In climates zones 4 and 5 and 4 ft. Rigid foam insulation also known as insulating boards provide high r values. Install it anywhere from the roof to the foundation. Insulation located below grade shall be extended the distance provided in table n1102 1 1 namely 2 ft.

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. Specify this solution zip 4 3 mb. For example with a forklift load on a typical 4 inch thick slab one calculation would indicate that 32 psi is applied to the insulation compared to only 2 5 psi under a more accurate calculation. R 7 7 rigid foam insulation model 310891 18 35 18 35.

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. This compliance option is explained this way. You can even place it under the foundation slab. Below grade under slab system with foamular rigid board insulation.

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. 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. Slab is one foot or less below grade r 10 insulation required extending 2 feet below grade for climate zones 4 and 5 4 feet below grade for climate zone 6 insulation should extend downward from the top of the slab with two options to reduce slab edge insulation r value exterior slab insulation must be protected 46. Below grade under slab system with foamular extruded polystyrene rigid board insulation and radiant heating.

Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Horizontal insulation placed less than 12 inches below the ground surface or that portion of horizontal insulation extending outward more than 24 inches from the foundation edge should be protected against damage by use of a concrete slab or asphalt paving on the ground surface directly above the insulation or by cementitious board plywood. Rigid insulation is one of the best tools to reduce your energy costs. Owens corning enclosure solutions.

Get all the construction documentation you ll need in a single click. They keep your home at a comfortable temperature without the need to crank your heat.