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.
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.
Below grade under slab system with foamular extruded polystyrene rigid board insulation and radiant heating.
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Use gravel fill to establish a stable even base.
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.
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Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.
Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.
R 7 7 rigid foam insulation model 310891 18 35 18 35.
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.
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.
A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs.
Specify this solution zip 4 3 mb.
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Below grade under slab system with foamular rigid board insulation.
Owens corning enclosure solutions.
Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place.
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 energy loss between ground and concrete slab.
Reduces potential for condensation and moisture damage.