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A step-by-step customer guide

How Polyurethane Concrete Lifting Works

Small holes, a controlled foam injection, and a slab lifted back to where it belongs. Here is what happens on the day of the job and what we check first.

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Before the first hole is drilled

Lifting works on a slab that is still sound but has lost the ground under it. It is not a fix for an active leak, badly broken concrete, a drainage design problem, or a moving foundation; those have to be dealt with on their own. A good proposal tells you both what the lift will do and what could limit it.

One panel, start to finish: drill, inject in short shots, let the foam fill the void and raise the slab to the target, patch the holes.

  1. 1

    We look at the slab with you

    You tell us when the movement showed up, where the water goes, and how the slab is used. We check cracks, joints, the neighboring elevations, any washout, and what the slab is attached to.

  2. 2

    Measure and set a target

    We measure how far each area has dropped and decide where it should end up: level with the next panel, meeting the door threshold, or sloped so water drains away. The goal is a safe, usable surface, not a laboratory-flat one.

  3. 3

    Lay out the injection points

    We mark where the holes go so the foam reaches the whole low area, staying clear of joints, drains, utilities, and anything attached to the slab. If you know of buried lines under the concrete, tell us before we drill.

  4. 4

    Drill the holes

    A handful of small holes, roughly the size of a dime, go through the slab. That is all the access we need: no saw cuts, no jackhammer, no hauling concrete away.

  5. 5

    Inject the foam in stages

    Two-part polyurethane goes in under the slab and expands, filling the empty space first and then lifting. We inject a little at a time and watch the concrete, not a gauge, so the lift stays controlled.

  6. 6

    Watch it come up

    We check the slab against the neighboring panels, doors, coping, drains, or steps as it rises, and stop when it reaches the target or when going further could damage anything.

  7. 7

    Patch and clean up

    We pull the equipment, patch the holes, and clean the area. The patches are small, but new material never matches weathered concrete perfectly, so you will be able to find them if you look.

  8. 8

    Back in use

    The crew gives you timing for foot traffic, vehicles and heavy loads based on the product, slab condition and completed work.

What lifting fixes

  • A sound slab that has lost the soil under it
  • A lip or drop between neighboring sections
  • Empty space under the treated area
  • Water pooling against a slab, when the surrounding grade allows

What lifting does not fix on its own

  • Active plumbing, pool, or irrigation leaks
  • Severely broken or deteriorated concrete
  • Structural foundation movement
  • The erosion, roots, or drainage problem that caused the settling

See the process for your surface

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Concrete Lifting Process FAQs

Not quite. The foam fills the empty space under the slab and, as it expands, pushes the concrete up. The soil, the neighboring slabs, and anything attached to the concrete all resist that push, which is why we lift in small stages.
It depends on the slab. A sound panel with a clear target can come up several inches; a cracked one or one tied into a footing has less room. We will tell you what is realistic when we inspect it.
The foam follows the open space it can reach, so the area we treat gets filled and supported. We cannot see everything under a slab, so we describe the area we are treating rather than promising every inch under the concrete.
Existing cracks can open or close as the slab moves, and a weak slab can crack. We look at the condition first and tell you the risk before we start; staged lifting keeps it as low as possible.

Have a slab that needs lifting?

Tell us where it is and what moved. We’ll inspect it, explain what we found, and give you a free estimate.

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