it's sand...

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I don't time that it's concrete that they inject it's a sand...then afer the floor is raised they use hyd. cement for the holes.....If I was you I would get a price for both, replacement and the lifting and then make the judgement call...remember garage floors dont get a good tamping and the settle over time...one more thing I heard of a storie were a guy did the injecting and it was X amount of money regardless of the amount of sand used...well they pumped and pumped and they never seemed to lift the slab...no one seemed to know why until someone walked behind the garage were it all was comming out.... :)