Concrete Leveling

Our Concrete Leveling Process: Filling Voids the Right Way

Uneven or sinking concrete is almost always the result of voids beneath the slab. These voids typically form from soil erosion, water washout, or poor compaction when the concrete was originally installed. Correcting the problem requires more than simply lifting the slab—it requires restoring proper support underneath it.

Before

Before concrete leveling the steps are leaning towards the left with uneven step heights.

After

After concrete leveling we equaled out the step heights, and made it level across.

Why We Use Ag Lime

At Irwin Concrete Leveling, we use ag lime, a finely pulverized limestone material, to stabilize and support concrete slabs. Ag lime is similar in texture to finely packed screenings, allowing it to flow easily into empty spaces while still compacting tightly once in place. This material is ideal for filling voids because it:

Flows smoothly beneath the slab
Packs densely for long-term support
Resists washout better than loose soils
Creates a stable, stone-like base once compacted

100%

Environmentally
Friendly Filler

Before

Before concrete leveling there was a valley in the sidewalk.

After

After concrete leveling the valley has been removed.

How the Process Works

Small access holes are drilled through the concrete, and a controlled slurry of ag lime is pumped beneath the slab. As the material fills the voids, it naturally spreads into low areas and empty pockets that formed from erosion or settling.

The weight of the concrete slab itself forces excess water out of the ag lime mixture. As this happens, the material compacts and “dry packs” beneath the concrete, forming a tightly packed, stable bed of limestone. This restored base supports the slab evenly and helps prevent future movement.

Before

Before concrete leveling the front porch has too much slope and the sidewalk at porch has a negative slope. There were two trip hazards.

After

After concrete leveling we reduced the slope on the porch and restored the slope on the sidewalk. The trip hazards were removed.

A Long-Term Solution, Not a Temporary Fix

By replacing lost support with a densely packed stone base, we’re not just lifting concrete—we’re correcting the underlying issue. This approach helps:

Eliminate hollow areas beneath the slab
Restore proper load distribution
Reduce future settling caused by voids
Extend the life of your concrete surfaces

Our goal is to provide a solution that stabilizes your concrete from the ground up, giving you a level surface you can trust for years to come.

A Stronger, More Reliable Way to Level Concrete

When concrete sinks or becomes uneven, the real problem isn’t the slab—it’s what’s missing underneath it. At Irwin Concrete Leveling, we focus on permanently restoring the support beneath your concrete, not just lifting it temporarily.

Built on a Solid Foundation

We use ag lime, a finely pulverized limestone material, to fill voids caused by erosion, washout, or poor soil compaction. Unlike loose soil or lightweight materials, ag lime compacts into a dense, stone-like base that provides consistent, long-term support.

Once pumped beneath the slab, the weight of the concrete forces excess water out, allowing the material to dry-pack tightly into place. The result is a finely packed bed of limestone that stabilizes the slab evenly from edge to edge.

Before

Before concrete leveling there was a very large step.

After

After concrete leveling the steps are equal height.

Before

Before concrete leveling there was a bump pulling into the garage.

After

After concrete leveling we eliminated the bump by lifting the driveway slab up to the garage floor.

Before

Before concrete leveling there is a very severe front porch that is tilting back towards the house funneling water towards the foundation and causing a huge step.

After

After concrete leveling we lifted the porch up restoring the slope that will redirect the water away from the house and correcting the step height.

Why This Method Works Better

At Irwin Concrete Leveling our process doesn’t rely on hollow lifting or temporary pressure. Instead, it rebuilds the base your concrete was meant to sit on. This approach:

Eliminates voids that cause sinking and cracking
Creates a strong, compacted support layer
Reduces the risk of future settling
Helps protect against water-related erosion

A Long-Lasting Solution You Can Trust

By addressing the cause of the problem—not just the symptoms—we deliver results that last. Properly supported concrete performs better, stays level longer, and protects the value of your property.

At Irwin Concrete Leveling, we don’t cut corners. We stabilize your concrete the right way—starting from the ground up.

Why Concrete Moves

1. Water Causes Soil Washout → Concrete Settles

When rain, melting snow, or ice gets into unsealed seams:

Water flows underneath the slab
It erodes and carries away the supporting soil (especially sand or fine material)
This leaves voids under the concrete
With nothing supporting it, the slab drops or settles

This is called washout, and it’s one of the most common reasons concrete becomes uneven. Even small gaps can lead to major settling over one winter because the water keeps moving back and forth under the slab.

2. Freezing Water Causes Heaving → Slab Lifts and Stays High

Water under the slab doesn’t just cause settling—it can also push concrete upward.

Here’s how:

Water seeps below the slab
Temperatures drop and that water freezes
Ice expands, pushing the slab upward (this is frost heave)
As the slab lifts, debris, gravel, or soil can shift underneath
When the ice melts, the slab doesn’t always drop back down
The trapped material keeps the slab higher than it’s supposed to be

This is why slabs can end up uneven even without visible cracking.

Why This Is Worse in Winter

Winter makes the problem snowball because:

Repeated freeze–thaw cycles keep moving the slab
Melting snow continuously feeds water into open seams
Frozen ground prevents proper drainage, so water stays trapped longer

One unsealed winter can undo years of stability.

Why Sealing Matters

Sealing joints and seams:

Blocks water from getting under the slab
Prevents soil erosion and void formation
Stops freeze expansion under the concrete
Extends the life of leveling and lifting work

In short:

No seal = water intrusion → washout or heave → uneven concrete.

Before

Before concrete leveling there was a large step and trip hazard.

After

After concrete leveling we created a proper step height and removed the trip hazard.