What Sinking Garage Floor Tells You About Your Concrete Repair
A sinking garage floor shows as the slab dropping below the foundation edge, sloping toward or away from the door, cracking across the floor, or a gap opening where the slab meets the foundation wall. Garage floors are frequently poured over fill brought in to raise the pad, and when that fill consolidates or erodes, the slab settles into the void. In Alabama's clay and with water intrusion at the garage door, this is common. The slab is usually structurally fine and can be lifted with foam back to level, restoring the floor and closing the gap at the foundation.
Garage pads on consolidating fill plus water intrusion at the door make sinking garage floors a routine concrete repair for APS across Alabama and Columbus, Georgia.
What Causes Sinking Garage Floor in Alabama Homes
Settling Fill Beneath the Slab
Garage pads are often built up with fill that later consolidates under the weight of the slab and vehicles, dropping the floor into the space left behind.
Water Intrusion at the Door
Rain and runoff entering at the garage door erode the soil beneath the front of the slab, a common reason garage floors settle worst near the opening.
Expansive Clay Movement
Alabama clay beneath and around the garage swells and shrinks, contributing to the slab dropping and cracking over time.
Separation From the Foundation
As the floor slab settles independently of the perimeter foundation, a gap opens where they meet, a telltale sign the slab has dropped.
Signs You Should Not Ignore
- The garage floor sloping toward or away from the door
- A gap where the floor meets the foundation wall
- Cracks running across the garage floor
- Water entering and pooling in the low area
- The slab visibly lower than it used to be
How We Diagnose and Repair the Problem
- 1
Free On-Site Assessment
An APS technician visits your property, documents the symptom and severity, and reviews all related indicators to build a complete picture.
- 2
Root Cause Diagnosis
Polyurethane foam injection lifts the settled garage slab back to level and fills the void beneath, closing the gap at the foundation, with drainage improvements where water at the door is the cause.
- 3
Written Estimate
You receive a clear written scope of work and cost estimate before any repair begins. No obligation.
- 4
Repair With Transferable Warranty
All APS foundation repairs carry a warranty that transfers to future owners. Serving Birmingham, Mobile, Huntsville, and Columbus, GA.
“Garage floors sit on fill, and fill settles. We lift the slab back up, fill the void, and close that gap at the wall.”
Frequently Asked Questions
Why is my garage floor sinking but the walls are fine?
Because the floor slab and the foundation are separate. The slab was often poured over fill that has since settled, so the floor drops into the void while the perimeter foundation, on different footings, stays put.
Can a sunken garage floor be raised?
Usually yes. Polyurethane foam injection lifts the slab back to level by filling the void underneath. It is far less disruptive than removing and repouring a garage floor and can often be used the same day.
What is the gap at the edge of my garage floor?
That gap is the slab having settled away from the foundation wall it was poured against. It confirms the floor dropped, and it closes back up when the slab is lifted.
Will it sink again?
Not if the cause is handled. APS fills the void and, where water at the garage door eroded the soil, recommends drainage or sealing so the fill is not washed out again.