Rigid Insulation Below Concrete Slab

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.

Rigid insulation below concrete slab.

Below grade under slab system with foamular rigid board insulation. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications. Eps 3 xps 2 faced or unfaced. Owens corning enclosure solutions.

Insulation below the slab suits continuous low level heating gradually warming the thermal mass of the concrete and sustaining it at a consistent temperature. 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. 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. R 7 7 rigid foam insulation model 310891 18 35 18 35.

Target an appropriate compressive strength. 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. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. 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.

Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. For installation on concrete foundations and under floor slabs the rigid foam insulation you choose can make a difference of tens of thousands of dollars on a project. In climate zones 4 and 5 the code requires certain slabs below grade slabs that are less than 12 in. 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.

A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. 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. Don t worry if the concrete contractors put a few holes in the poly.