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.
Dow rigid insulation under slab.
Below grade under slab system with foamular rigid board insulation.
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Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place.
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Owens corning enclosure solutions.
Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.
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.
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Specify this solution zip 4 3 mb.
Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.
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.
R 7 7 rigid foam insulation model 310891 18 35 18 35.
Use gravel fill to establish a stable even base.
Under floor slabs for under floor slabs foamular 150 or 250 can be used for residential and light commercial applications where floors are subject to normal loads.
Reduces potential for condensation and moisture damage.
Use foamular 400 600 or 1000 for industrial applications where floor areas will be exposed to heavy loads.
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Dupont styrofoam brand extruded polystyrene foam insulation is an ideal solution for under slab installations offering the following advantages.
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.
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.