What Causes an Uneven Slab Foundation?

Before looking at the reasons to repair your uneven concrete slab, you should probably first understand what causes it. That way, you’ll know what the various repair possibilities are that can help your concrete slab rise back up.

There are three very common reasons to encounter an uneven concrete slab. 

House Settling

By far the most common reason for an uneven slab foundation is house settling. It’s common for homes to experience some amount of settling through the years, and as the home settles, it might settle slightly differently in different areas.

If there’s a concrete slab or multiple concrete slabs on and around your home, that settling will start to show up in a very obvious way. The slabs might not match up, because they’re settling differently. If it’s settling too much, that will become even more apparent. 

Freeze-Thaw Cycling

This is one way that house settling happens. Freeze-thaw cycling describes the way the ground outside freezes, then thaws depending on the temperature outside. In home repair terms, that means when the ground freezes, it expands or swells upwards (frost heaving), and when it thaws, it compacts.

This expanding and contracting isn’t great for a home. You can see the same thing happen with water and droughts, which also causes the soil to expand and contract. If this happens underneath a concrete slab, it’s easy for the slab to raise or lower. 

Poor Planning

You might also experience an uneven concrete slab if the original construction crew utilized poor planning when laying that concrete. Did the construction crew mix the concrete properly? Did the designer construct the foundation so it all bears the weight equally?

Though this is the least common reason for uneven concrete, it’s still an important one to pay attention to. Poor planning can impact a substantial amount of your home. If the original construction crew and designers didn’t plan the home properly, you need to know that for the rest of the structure.

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