Why the sinking slab?

Tuesday, February 28th, 2017 by Heather Price

Sinking slabs, uneven and cracked concrete will happen over time, but not without cause.  What's the culprit, you ask? Slab settlement.  Slab settlement is the movement a concrete slab experiences when the soil below can no longer support the weight of it.

There are several reasons why this occurs, but in most cases the three most impactable factors are soil washouts, poorly compacted fill soil, and soil moisture changes.  

Soil Washouts

Washouts can be caused by things like plumbing leaks and large rains, amongst other things.  As the water seaps under the slab, it will eventually wash away the soil that is supporting the weight of the concrete.  Over time, the amount of soil that is needed to support the slab will diminish and this is when you will begin to notice the sinking.

Poorly Compacted Fill Soil

Fill soil is often spread out during the construction process.  Once the fill soil is spread out or moved around, it is necessary to compact this soil to a certain grade level.  If it is not properly compacted and a slab is poured on loosely compacted soil, over time the soil will begin to compress under the slab that has been poured on top of it, creating an "empty space" between the slab and fill soil.  

Soil Moisture Changes

Soil goes through dry and wet moisture changes.  Why soil becomes too dry, it begins to shrink under the slab.  Once this shrinking happens it creates that empty space between the slab and the soil, causing the sinking, cracked, and uneven concrete.  

Contact Power Jack Foundation Repair today to schedule your FREE estimate and find out how PolyLevel is your answer to fixing your sinking slab. 


About the author
Heather Price joined the team at Power Jack Foundation Repair in February 2017. As the Marketing Manager, she oversees the company's marketing department.

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