Geolift works in three steps.
Spray foam under concrete sidewalk.
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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.
Polyurethane concrete raising foam needs to lift concrete but should not adhere to it.
Shore up concrete problems.
If raising a slab of concrete along foundation foam can adhere to the foundation and lock the slab into place.
I would use polyurethane 2 part spray foam and fill from one side to the other.
Spray foam really is a magical tool for household insulation.
Foam jacking is a concrete slab repair method that uses a high density polyurethane foam to raise the slab.
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Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor.
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How to lift a sidewalk diy using canned foam.
Exterior concrete slabs such as sidewalks and driveways can be quickly lifted and stabilized with expanding polyurethane foam injection.
The first step is to drill holes in the problem concrete.
Concrete jack is the leader in the field but there are many others.
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.
Whether the dirt below it has gotten wet or the concrete was damaged accidentally you can repair either issue with foam.
And yes it is a foam just like your beloved spray foam.
Cures quickly can be trimmed once cured and is waterproof.
Btw it is very durable and supports loads well.
I had several voids filled quickly and easily in a short time.
Geolift works for driveways sidewalks patios garage floors even pool decks.
This process is much the same as mud jacking an older method that uses a concrete slurry mixture to obtain the same results.