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.
Dow rigid insulation under slab.
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When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost.
Below grade under slab system with foamular rigid board insulation.
Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.
Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place.
Reduces potential for condensation and moisture damage.
Dupont styrofoam brand extruded polystyrene foam insulation is an ideal solution for under slab installations offering the following advantages.
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Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.
Below grade under slab system with foamular extruded polystyrene rigid board insulation and radiant heating.
R 7 7 rigid foam insulation model 310891 18 35 18 35.
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Use gravel fill to establish a stable even base.
Products in this solution.
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.
Owens corning enclosure solutions.
Specify this solution zip 4 3 mb.
Use foamular 400 600 or 1000 for industrial applications where floor areas will be exposed to heavy loads.
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.
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.