Throughout the years, as water and melted snow seep into the ground it will grow and shrink. As this soil shifts and moves around, open pockets can be created. The slab can sink into these open spaces and ultimately form cracks in slabs or gaps between slabs.
There are numerous factors and conditions that can cause the settling of concrete slabs. Reasons could include major changes in the moisture level of the soil from wet weather or an extended period of dry weather that causes the soil to become depleted of water and shrink.
The moisture level in the soil will change over time, it causes the concrete on the soil to become damaged. If the soil becomes saturated due to improper drainage, this water will cause the earth to become weak and unable to support the concrete.
If the temperature is hot and no rain falls for extended periods of time, it will cause soil shrinkage. As the soil dries out, it will create voids below the concrete. Over time, these voids will stress the concrete slab, which will eventually cause it to fail.
During construction, the soil is removed and replaced. Once this is completed it is very important that it is restored to the original state as when it was taken out. If the earth is not properly compacted, it can rapidly speed up the forming of voids under the slab poured on top. These voids will put undue weight on the slab and can cause settling over time.
Any place there is earth below your concrete, there is a danger of requiring concrete raising. These are some of the most problematic locations that we've seen both companies and residential property owners needing our services.
The ideal alternative to removing and re-pouring your cracked or sinking concrete is polyjacking.
This is a relatively new technology that makes use of expanding polyurethane foam to lift and repair these sinking slabs back to their intended position. Historically a method called mudjacking has been used to perform a similar procedure. The advantage that polyjacking has over mudjacking is the polyurethane foam quickly expands to fill the cavity and then hardens to permanently restore the concrete in position.
If you're in need of permanent concrete slab leveling and raising, contact us today for an estimate.