In some cases, the damage to concrete slabs may not be advanced. In this case there was some minor cracking in the driveway slabs and the control joints were hollowed out. In that scenario water is free to make it's way under the slabs and cause water to erode the soil beneath, leaving voids under the concrete that cause cracking and settling. WE protected this driveway for many years to come by filling existing voids with PolyLevel to ensure the slabs won't settle. We also filled any cracks and control joints with NexusPro to keep water from pooling up below the slabs.