Void Filling fills up the spaces (voids) under your concrete that have occurred as a result of soil erosion or where settling has occurred. If water has gotten under your concrete slabs, it can cause soil erosion and your slabs will sink into the void left behind where the soil used to be. Also, if the area around your foundation has settled over time because it may not have been properly compacted, this will cause your concrete to sink as well.
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Mud jacking is the way to add fill under your concrete slab. You may not be able to see it, but the soil underneath has settled under the concrete slab, garage floor, or wherever the problem area is at. As a result, you see signs of cracking, re-bar popping out or Uneven joints.