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Uneven or unstable concrete can create safety hazards and lead to bigger problems over time. Cracked sidewalks, slabs that begin to shift, and hollow areas beneath concrete can allow water to collect and accelerate deterioration. Addressing these conditions early helps protect the concrete you already have and reduces the risk of future settlement.
At Level Best Northwest, concrete stabilizing is a preventative repair service focused on filling voids beneath concrete slabs, not altering or reinforcing soil. Our goal is to support existing concrete, improve stability, and extend its usable life without unnecessary replacement.
What Is Concrete Stabilizing?
Concrete stabilizing is the process of filling voids between a concrete slab and the substrate beneath it using polyurethane foam. Over time, erosion, moisture, or poor compaction can leave empty spaces under concrete. These voids allow slabs to flex, crack, and eventually sink.
Concrete stabilizing restores support under the slab before significant settlement occurs.
How it works
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Small access holes are drilled into the concrete
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Polyurethane foam is injected beneath the slab
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The foam expands to fill voids and gaps under the concrete
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The slab is supported to reduce movement and help prevent future settling
Level Best Northwest does not perform soil stabilization or foundation repair. While we can address cosmetic concrete issues near foundations, we do not take on projects involving structural or load-bearing foundation work.
Benefits of Concrete Stabilizing
Helps prevent future settlement
By filling voids early, concrete stabilizing reduces the likelihood of slabs sinking later, helping maintain a more stable and predictable surface.
Improves safety
Supported concrete is less likely to shift or crack unexpectedly, reducing trip hazards and uneven transitions over time.
Cost-effective alternative to replacement
Concrete repair is typically about 50–60% less expensive than full replacement.
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Repair averages $10–$12 per square foot
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Replacement often costs $16–$20 per square foot, or more
Stabilizing existing concrete avoids demolition and keeps projects within a more manageable budget.
Eco-friendly concrete repair solution
Repairing concrete instead of replacing it reduces environmental impact by:
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Avoiding damage to surrounding landscaping
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Eliminating the need to haul broken concrete to the dump
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Reducing overall material waste
Keeping concrete in place whenever possible is a more sustainable approach.
Concrete Stabilizing vs. Concrete Lifting
Concrete stabilizing and concrete lifting are related services, but they solve different problems.
Concrete Stabilizing
Concrete stabilizing is used when voids exist beneath a slab, but the concrete has not yet significantly sunk. The goal is to fill voids and support the slab to reduce movement and help prevent future settlement.
Concrete Lifting
Concrete lifting is used when a slab has already settled and needs to be raised back to a practical level. Polyurethane foam is injected beneath the slab to lift and level the concrete while also filling voids.
If you’re unsure which service is appropriate, Level Best Northwest can evaluate your concrete and recommend the right repair approach based on the condition of the slab.