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Floor slabs most often settle due to poor compaction of the underlying sub-grade; however, dramatic changes in the water table, poor exterior drainage, and ruptured sub-surface piping can also be factors. Carolina Foundation Solutions, LLC offers a variety of solutions to stabilize and, in most cases, lift a floor slab back into place.
Pressure Grouting
Pressure grouting is a process whereby the void that is created underneath the slab as it settles is filled with a very loose cementitious grout mixture, and then pressure is applied to this grout while it is still in a liquid form, creating a hydraulic type pressure under the slab, causing it to lift upward and back into place
Concrete Slab Piers – The Permanent Solution for Sinking Slabs
Sometimes slab settlement cannot be corrected by pressure grouting alone. When the sub-grade underneath the slab becomes saturated from leaking pipes or the level of un-compacted fill is very high, the slab can continue to settle even after being pressure grouted. To solve this problem, Carolina Foundation Solutions, LLC offers A.B. Chance helical piers outfitted with a special bracket designed to go through the problem soils and bear the weight of the slab on a permanent anchoring system.
First, a hole must be cored through the slab to accept the helix. Next, the helical pier is advanced through the fill, or saturated zone, and into dry, firm, stable, load bearing soil. Then, a special bracket, designed to support a section of the surrounding slab, is attached to the top of the helical pier shaft and the bracket is used to lift the slab back into place. Finally, the void under the slab is filled with grout and the core holes are patched.
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