Drainage issues that cause concrete to settle
Water is the most common driver of settlement. When runoff concentrates along the edge of a slab, it can wash out fine material from the base. Over time, voids form—and the concrete drops under load.
- Why downspouts matter
- Signs of washout and voids
- A homeowner checklist to reduce repeat sinking
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What “washout” looks like
Many sinking slabs aren’t caused by “bad concrete”—they’re caused by loss of support underneath. The edge of a driveway, patio, or sidewalk can act like a gutter for runoff. If water repeatedly flows across the same edge, it can erode the base and create a pocket. Once the pocket is large enough, the slab settles.
Common drainage culprits
- Downspouts dumping next to a slab edge
- Sump discharge routing onto concrete
- Negative grade (soil sloping toward the house)
- Low spots that hold water after storms
- Gutters overflowing in heavy rain
Practical drainage checklist (homeowner-friendly)
- Extend downspouts 6–10 feet away (or to a safe discharge area).
- Confirm soil slopes away from the foundation for at least the first several feet.
- Redirect sump discharge so it doesn’t empty next to a slab or into a walkway joint.
- Seal joints and cracks where appropriate to reduce water intrusion.
- After a heavy rain, walk the property and note where water is flowing and pooling.
How this connects to leveling
Concrete leveling can fill voids and lift slabs back toward their original position. But if drainage continues to wash out the base, the slab may move again over time. The best outcomes usually combine leveling with basic water management.
For surface-specific guidance, explore a service guide:
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