The empty space under your slab is what sinks it. We fill voids and stabilize the soil with polyurethane foam, stopping settlement before it turns into a much bigger repair.
Free on-site quote · Owner oversees every job · BBB A-rated & insured
Sinking, cracking, and shifting usually start with a void, an invisible gap where the soil has eroded or settled. Filling it early costs a fraction of waiting for the slab to fail.
Voids under concrete are invisible but destructive. They form as soil erodes, washes away, or compacts over time, leaving the slab with nothing to rest on. In Edmonton, where freeze-thaw cycles speed up soil movement, void filling is often the critical first step to preventing costly concrete failure.
We use high-density polyurethane foam to fill the voids and stabilize the soil under your slabs. It’s a proactive fix that can stop sinking before it starts, or halt existing settlement before it gets worse. Filling the void is step one. If the slab has already dropped, we lift it flush in the same visit, driveway, walk, and garage included. For large commercial or industrial slabs, we scope the work on site anywhere in Alberta.
Voids don’t show obvious damage right away. These are the early signs:
Knowing what creates a void helps you prevent the next one. In Edmonton, a few causes come up again and again:
Assessment & detection — We inspect the slab and locate the voids through sound testing and probing, then explain what we find.
Strategic drilling — Small 5/8" holes at calculated points reach the voids beneath, far smaller than traditional methods need.
Foam injection — High-density polyurethane fills the cavities, penetrating loose soil and compacting it as it cures.
Soil stabilization — As it expands, the foam bonds with the surrounding soil into a stable, water-resistant base that resists future erosion.
Patch & cleanup — We patch the holes to blend with the concrete. The foam cures in minutes, so you can use the slab right away.
Older void-filling methods use sand, grout, or mudjacking slurry, materials that can wash out again. Our polyurethane won’t:
The most common sign is a hollow sound when you walk on or tap the slab. Others include visible settling, new cracks, water pooling in odd spots, and gaps opening between the slab and nearby surfaces. If you suspect a void, we’ll confirm and locate it during a free assessment.
Void filling is priced by the size of the void and how much foam it takes, and it comes in at a fraction of the $10,000 or more a failed slab can cost to level or fully replace later. Every quote is a transparent fixed price after a free assessment.
They’re related but different. Void filling packs the empty space under the slab to stop future sinking. Concrete leveling actually lifts a slab that has already dropped. Often we do both: fill the void to stabilize the area first, then lift the slab if it needs it.
Yes, that’s often the whole point. Filling voids before the slab settles keeps it from dropping and cracking. Doing it early is far cheaper than waiting until you need full leveling or replacement.
Most residential jobs are done in 1 to 3 hours. The foam cures within minutes of injection, so the concrete is ready for normal use as soon as we finish.
We control that. For pure void filling we inject just enough to pack the cavity and stabilize the soil without raising the slab. If you also want the slab lifted back to level, we can do that in the same visit.
Yes. Residential jobs are usually a few hours; commercial and industrial voids need more material and planning, and we scope those on site. Either way we’re owner-operated: the owner oversees residential and commercial jobs alike.
Sand and grout can wash out again with the next round of water, which is often what caused the void in the first place. Polyurethane is waterproof, lightweight, and bonds with the soil, so it stays put and doesn’t add weight that could cause more settling.
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