Use 5 8 inch masonry bit to drill a hole through the concrete and spray the foam into it.
Spray foam under concrete floor.
Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor.
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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.
And yes it is a foam just like your beloved spray foam.
The foam will expand and harden filling the void in the ground and leveling the driveway.
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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The first step is to drill holes in the problem concrete.
Geolift works in three steps.
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Locate the dips get the right equipment and foam.
Shore up concrete problems.
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.
Insulating under concrete using spray foam will control heat loss through the floor also provide a warmer more comfortable floor on which to walk and live.
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Spray foam really is a magical tool for household insulation.
Basements that are built on insulated concrete slabs will be more comfortable to occupy for extended periods of time making it easier to use the floor area for bedrooms kitchens even.