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What Causes Concrete Slabs To Sink Or Become Uneven?

Concrete slabs are designed to provide durable, level surfaces, but over time many begin to sink or shift. Property owners often wonder what causes this problem and how it can be prevented or repaired. Uneven concrete not only affects curb appeal but also creates safety risks and potential structural issues. Understanding the main causes of sinking slabs helps homeowners and property managers take proactive steps to protect their investments.

Common Causes of Sinking or Uneven Concrete

One of the most common causes of slab sinking is soil erosion beneath the concrete. Rainwater, poor drainage, or plumbing leaks can wash away supporting soil, leaving gaps that cause slabs to settle unevenly. Expansive soils that shrink during dry periods and swell with moisture also contribute to shifting. According to industry data, soil instability is responsible for the majority of uneven slab issues. When voids form, the weight of the concrete quickly leads to visible sinking or tilting.

Other contributing factors include improper soil compaction at the time of installation, heavy loads that exceed the soil’s bearing capacity, and tree roots disturbing the ground underneath. Freeze-thaw cycles are also a significant cause in colder climates, as water beneath slabs expands when frozen and contracts when thawed, leading to movement. These conditions create cracks, trip hazards, and uneven surfaces that worsen if not addressed. Recognizing these causes is the first step toward finding an effective solution like cement raising or slab stabilization.

Ready To Start Your Concrete Leveling Project? Identifying the root causes of uneven slabs helps ensure long-lasting repairs that restore safety and appearance. Submit the contact form today to request service from a local professional in your area and restore your concrete surfaces.

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What Causes Concrete Slabs To Sink Or Become Uneven?

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