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Slabjacking lifts and stabilizes concrete slabs that have tilted or cracked. I've been in the business since 1981, and my company, American Concrete Raising, does nothing but slabjacking. Our prices generally run about half the cost of putting in a new slab. Slabs settle for two reasons—poor soil and poorly compacted backfill. Soils with high clay content expand and contract as the moisture content of the soil changes. In drought years, the soil shrinks and leaves voids under the slab. Voids also occur under slabs placed on poorly compacted fill. When contractors build a foundation, they often don't fully compact the backfill. Over time, the soil compacts itself and begins to recede. Anything resting on the soil comes down right