Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place.
Dow rigid insulation under 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.
Products in this solution.
Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.
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Specify this solution zip 4 3 mb.
Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.
Since its discovery in 1941 styrofoam brand xps insulation has a long and rich heritage as a sustainable building product insulating to meeting core thermal moisture air and vapor performance requirements through its rigid foam board technology.
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.
Reduces potential for condensation and moisture damage.
I wouldn t go as far as saying you couldn t use spray foam below a slab but i m not sure why you d want to.
Owens corning enclosure solutions.
Below grade under slab system with foamular extruded polystyrene rigid board insulation and radiant heating.
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Below grade under slab system with foamular rigid board insulation.
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Use gravel fill to establish a stable even base.
R 7 7 rigid foam insulation model 310891 18 35 18 35.
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Dupont styrofoam brand extruded polystyrene foam insulation is an ideal solution for under slab installations offering the following advantages.
When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost.
Reduces energy loss between ground and concrete slab.
A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs.