Rigid Insulation Below Concrete Slab

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.

Rigid insulation below concrete slab.

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. In climate zones 4 and 5 the code requires certain slabs below grade slabs that are less than 12 in. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. Where the heating is likely to be turned on and off such as in new build domestic properties and a faster thermal response is required the floating floor arrangement of.

Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications. 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 careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department.

R 7 7 rigid foam insulation model 310891 18 35 18 35. Target an appropriate compressive strength. Eps 3 xps 2 faced or unfaced. One of the best ways to save money on rigid foam insulation installed under concrete slabs is to ensure the material is not over engineered.

Below grade under slab system with foamular rigid board insulation. Below grade to have r 10 vertical insulation at the slab perimeter extending downward from the top of the slab to a depth of at least 2 ft. It doesn t really matter very much whether the pex is near the bottom of the slab in the middle of the slab or at the top of the slab as long as there is plenty of insulation under the slab. Owens corning enclosure solutions.

Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Insulation below the slab suits continuous low level heating gradually warming the thermal mass of the concrete and sustaining it at a consistent temperature. If the slab has hydronic tubing the minimum r value of this insulation increases to r 15.