Concrete is heavy! When the soils underneath a concrete slab are unable to support its weight, the slab will sink. If part of the concrete slab is supported and other parts are not, the unsupported portions will crack away or sink resulting in an unlevel surface.
Soils under outdoor concrete slabs fail for two primary reasons:
Different types of soil have different load-bearing capacities. When a soil's load-bearing capacity is exceeded, the soil will compact and settle.
It's also possible for the soil beneath a slab to settle and compact of its own accord. Soil that contains large amounts of clay and/or silt will shrink substantially in dry weather and expand during wet seasons. As the soil expands and contracts beneath your concrete slab, the slab will sink and heave - often cracking in one or more spots.
The soil under your driveway, patio or concrete steps may not always stay in the one place it's needed to support your structure.
As water moves through the ground under your concrete slabs, it can begin to wash away supporting soils that prop up your concrete. As this soil washout continues, it creates voids and empty space under the slab. Over time, those voids grow and your concrete will begin to sink or cave in.
The good news is you don't have to live with sunken and uneven concrete. Check out our before and after photos that show how PolyLevel® can lift and level concrete on your property!
We would be happy to provide you a free evaluation and cost estimate for PolyLevel® concrete repair in Omaha, Lincoln, Sioux City, Bellevue, Council Bluffs, Kearney, Grand Island, Fremont, North Platte, Norfolk and the surrounding areas.