Why Concrete Sinks

It’s never fun to discover that you have a concrete sinking problem around your home. It is, however, quite common. In fact, did you know that most homes in America experience a settled concrete issue at some point. There are many reasons that can cause concrete to sink but all sinking concrete comes down to the soil below it. If there’s not enough good soil/gravel to support the heavy slab, or if your soil is expansive, your concrete is more prone to sinking and cracking. These are some of the most common reasons concrete slabs start to sink in Idaho and Oregon.

Fluctuating Moisture Content

Most soils have clay content in them and the more clay found in the soil the more expansive they can get. So, when it rains, the clay soaks up as much water as possible and begins to swell. Then, as the soil dries out, it begins to shrink and can no longer support the pressure from the heavy concrete slab on top of it, causing your concrete slabs to sink irregularly.

Temperature Changes

In Idaho and Oregon where the temperature fluctuates between freezing and thawing, expansive soils can lead to problems. Expansive soils are those with clay properties that swell and contract when exposed to water and dryness. When these expansive soils are beneath your concrete, the saturated earth can push up the concrete when it freezes. Then, after it thaws and the water evaporates, the ground can shrink up. This constant change in water can lead to settlement and cracks in your concrete.

Soil Washout

If your home was built on sandy soil, you may be dealing with soil washout. Soil washout is when rainwater flows beneath the slab, the sandy soil is easily disrupted and can start to wash out with the water. This erosion leaves voids beneath the slab when the soil can no longer support the heavy concrete slab and it will start to crack and sink.

Poorly compacted soil

Before your concrete is even poured it needs to have the proper base material such as road mix or gravel and then it must be compacted in place using approved methods. If the team installing your concrete didn’t compact the soil beneath it well enough before pouring, it will start to compact on its own under the weight of the concrete over time. This will eventually lead to sinking and cracks in your concrete.

A fast, efficient solution

Our Poly Lift and Level process is a fast, long lasting and accurate way to re-level your sunken concrete. We simply inject it underneath your concrete slab and as it expands it lifts the concrete back into place. Once the concrete reaches the desired level, the foam hardens in place, filling the voids below the concrete and provides a new solid structure to support it. Call Idaho Concrete Lifting at 208-912-0027 for a free evaluation and quote on your concrete leveling project today!

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