Rigid Insulation Below Concrete Slab

In climate zones 4 and 5 the code requires certain slabs below grade slabs that are less than 12 in.

Rigid insulation below concrete slab. Don t worry if the concrete contractors put a few holes in the poly. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. Below grade under slab system with foamular rigid board insulation. 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. 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. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. 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.

If the slab has hydronic tubing the minimum r value of this insulation increases to r 15. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Eps 3 xps 2 faced or unfaced. Insulation below the slab suits continuous low level heating gradually warming the thermal mass of the concrete and sustaining it at a consistent temperature.

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. 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. Target an appropriate compressive strength.

Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. 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. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.