Concrete jack is the leader in the field but there are many others.
Spray foam under concrete sidewalk.
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The polylevel method for lifting and stabilizing a sidewalk or other exterior concrete slab is to inject structural polyurethane foam under the sunken section of concrete.
Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor.
Geolift works in three steps.
The first step is to drill holes in the problem concrete.
Spray foam really is a magical tool for household insulation.
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Whether the dirt below it has gotten wet or the concrete was damaged accidentally you can repair either issue with foam.
Shore up concrete problems.
And yes it is a foam just like your beloved spray foam.
Foam jacking is a concrete slab repair method that uses a high density polyurethane foam to raise the slab.
Cures quickly can be trimmed once cured and is waterproof.
This process is much the same as mud jacking an older method that uses a concrete slurry mixture to obtain the same results.
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How to lift a sidewalk diy using canned foam.
Btw it is very durable and supports loads well.
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Polyurethane concrete raising foam needs to lift concrete but should not adhere to it.
Geolift works for driveways sidewalks patios garage floors even pool decks.
Although fiberglass has been commonly used for insulation spray foam can actually outperform it plus with so many ways you can use spray foam this material certainly is handy now only if it could help us out with all of those concrete problems.
Concrete foam jacking or concrete leveling or poly jacking when a concrete slab starts to dip inwards it s likely due to a lack of support underneath.
I would use polyurethane 2 part spray foam and fill from one side to the other.