Common Reasons Concrete Settles and Sinks in South Florida

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 by soils and other sections are not, the unsupported pieces may crack away from the other section and result in unlevel concrete.

NSquare, Inc. can inspect the condition of your concrete slab during an on-site estimate. Call us today to schedule a free quote in Sarasota, Lee, Collier, Charlotte, Glades, Hendry, Monroe, Miami-Dade, Broward and Palm Beach. 

Concrete Leveling

Soil washout can result in empty space beneath your concrete slab, unable to support it. This can lead to cracks and sinking over time.

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Primary Causes of Sinking Outdoor Concrete:

1: Soil Shrinkage, Compaction & Settling

Different types of soil have different load-bearing capacities. When a soil's load-bearing capacity is exceeded, the soil will compact and settle.

Changes in the amount of moisture in the soil can affect the soil underneath your concrete slab. When the soil gets wet, it holds water and expands in size. When the soil becomes dry, it begins to shrink, creating voids (or empty space) under the slab, resulting in uneven, cracked concrete.

compacted soil

This hoof print in the mud shows how easily soil can compact and compress when bearing weight.

2: Soil Washout

The soil that is underneath your driveway, patio or concrete steps may not necessarily remain there to provide adequate support for the concrete element. Water from heavy rains and plumbing leaks can find its way underneath your concrete slab and wash away the soil that's supporting the concrete.

As water moves underneath your concrete slabs, it can wash away the soil that's supporting the weight of the concrete. As this happens, it creates a void, or empty space, underneath. Over time, with nothing to support it, your concrete slab can begin to sink or cave in.

Look familiar? Soil washout is all too common in Florida, leaving concrete slabs and structures that are not properly filled susceptible to sinking and settling.

3: Poorly Compacted Fill Soil

During installation of a concrete driveway, patio, sidewalk or foundation, if the new concrete is poured on top of loosely compacted soil, the slab is more likely to settle.

As the fill soil underneath the concrete slab compresses and settles, this creates voids under the slab. With nothing supporting the slab, the concrete cracks and sinks.

As the soil gets washed away, this leaves voids under the slab. With nothing to support the weight of the concrete, the slab will begin to sink.

Void Fill

The same sidewalk from above is easily and permanently repaired with PolyLevel®!

Fast and Permanent Solutions with PolyLevel®

The good news is that you don't have to live with sunken concrete anymore! Check out our photo gallery to illustrate what PolyLevel® concrete lifting can do for your property!

We would be happy to provide you a free evaluation and cost estimate for PolyLevel® concrete repair in Coral Springs, Jupiter, Pembroke Pines, Boca Raton, Myakka, Royal Palm Beach, Kendall and throughout Southern Florida.

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