What Is Garage Floor Leveling?
A garage floor is a slab on grade poured over compacted fill, and it is one of the first slabs on an Alabama home to show settlement. The fill placed against the foundation during construction consolidates over time, and the expansive clay beneath it shrinks through dry summers and swells again through wet winters. The slab loses its support and drops. The first sign is usually a step at the door between the garage and the house, or a visible gap where the slab has pulled down from the foundation wall. That gap matters beyond appearance. It gives surface water a direct path down alongside the footing, which is how a cosmetic complaint becomes a foundation drainage problem. APS lifts settled garage slabs with polyurethane foam injection. Small ports are drilled through the slab, structural foam is injected beneath it, and the expanding foam fills the void and raises the concrete back toward grade. The foam is hydrophobic and lightweight, so it does not add load to the soil that failed in the first place and it does not wash out. Because the foam reaches its working strength within minutes, a garage floor lift is typically a single visit and you can park on the slab the same day. Where the slab has settled unevenly across control joints, APS lifts each section independently so the finished floor drains toward the door rather than back toward the house.
“On a garage slab we care as much about the drainage slope as the elevation. Lifting the concrete without restoring the fall toward the door just moves the water problem indoors.”
How APS Approaches Garage Floor Leveling
- 1
Elevation survey
We measure the slab across its full area to map how far each section has dropped and which direction it currently drains.
- 2
Void assessment
We identify where the fill beneath the slab has consolidated, so the foam is placed where the support is actually missing.
- 3
Port drilling
Small injection ports are drilled through the slab at measured intervals along the settled sections.
- 4
Foam injection and lift
Structural polyurethane foam is injected in controlled stages, raising each section while elevations are monitored in real time.
- 5
Slope verification and patch
We confirm the finished floor drains toward the door, then patch the ports with grout.
When this approach is not appropriate: If the slab is broken into many small pieces rather than settled as intact sections, lifting will not hold and replacement is the honest recommendation. APS will say so in the written estimate.
Frequently Asked Questions
How long before I can park on the garage floor?
Polyurethane foam reaches its working strength within about 15 to 30 minutes, so in most cases you can drive on the slab the same day the work is done.
Will the injection holes be visible?
The ports are roughly the diameter of a pencil and are patched with grout at the end of the job. On a garage floor they are usually barely noticeable, and they are far less intrusive than the saw cuts replacement would require.
Why is my garage floor lower than the rest of the house?
The garage slab is normally poured on fill rather than on undisturbed soil, so it settles independently of the footings that carry the house. A step at the garage door is the usual result and it does not by itself mean the foundation has moved.
Does APS level garage floors that slope the wrong way?
Yes. Correcting the drainage slope is part of the work. Sections are lifted independently so the finished floor falls toward the garage door instead of toward the interior wall.