Why Does Concrete Sink?

Everyone has seen an old slab of concrete that is uneven and tilted. When the concrete was poured, it was laid evenly, but over time it became crooked. There are several reasons that your concrete walkway, crawlspace or foundation is sinking. The most common reasons are due to moisture and soil type.

Moisture and Soil

Soil shifts and moves over time. Depending on the region in which you are living, the soil can be extremely weak, causing it to shift, sink and erode. Concrete has to be supported by the soil underneath the slab; and when the slab is exposed to too much moisture, it can be severely damaged. A concrete slab starts to sink when it is no longer supported.

Moisture damage is one of the leading causes of foundation issues. Moisture that collects underground can erode the soil that is providing strength to the support structure. However, if caught early, moisture barriers (link to ‘moisture barrier’ page) or a drainage system can be put in place to prevent further damage to the support structure.

Our Concrete Solutions

CNT Foundations has solutions for all of your concrete issues:

  • Concrete removal and replacement  Sometimes concrete is too damaged and has to be removed and replaced. CNT Foundations can remove your old concrete and pour a new, better supported concrete slab.
  • Polylift - Polyurethane foam has grown in popularity because it is lightweight and waterproof, with a quick curing time that allows the concrete slab to be used minutes after the concrete slab is level again.
  • Mudjacking - A tried and true approach to concrete leveling, mudjacking is the process of injecting a slurry beneath the concrete slab, filling the void caused by soil erosion.

CNT Foundations has corrected countless uneven concrete slabs. To learn more, call your #1 choice in South Carolina for foundation & crawl space repair in North Charleston at 843-405-7022.