Polyurethane Foam Lifting in Montgomery, AL

Polyurethane foam lifting has revolutionized concrete leveling. Instead of pumping heavy

cement slurry under a sunken slab, contractors inject a two‑part liquid foam that expands and

hardens in seconds. For homeowners in Montgomery, Alabama, foam lifting offers a lighter,

faster, and longer‑lasting solution for driveways, sidewalks, and foundations.

The Science of Polyurethane Foam

The foam used for concrete lifting is a high‑density, closed‑cell polyurethane. Two liquid

components—an isocyanate and a resin—are mixed at the injection port. They react

immediately, producing a foam that expands to 20 times its liquid volume. The expanding foam

fills voids beneath the slab and lifts the concrete as it grows. Within 15 minutes, the foam cures

to a rigid, waterproof material that weighs only 2 to 4 pounds per cubic foot. Montgomery

Foundation Repair Co uses only commercial‑grade foams with expansion pressures carefully

controlled to avoid cracking the slab.

Advantages Over Mudjacking

Foam lifting offers several clear advantages. First, the foam is lightweight, so it does not add

stress to already weak clay soil. Second, the foam is waterproof and will not wash out over

time. Third, the foam cures in minutes rather than days, allowing immediate use of the repaired

slab. Fourth, the injection holes are only 5/8 inch in diameter, leaving tiny patches that are

barely visible. Fifth, foam lifts slabs more precisely because the expansion can be controlled in

small increments. For these reasons, Montgomery Foundation Repair Co uses polyurethane

foam for almost all residential concrete leveling projects.

Applications in Montgomery Homes

Foam lifting is ideal for sunken driveway sections near the garage, settled front walkways,

uneven patio slabs, and trip‑hazard sidewalk panels. It also works for pool decks, warehouse

floors, and even concrete steps. In some cases, we use foam to fill voids under a slab

foundation that is not yet settled but shows early signs of soil erosion (a process called void

filling). The foam prevents future settlement by stabilizing the base. Montgomery Foundation

Repair Co has lifted thousands of concrete slabs across the River Region with a success rate

of over 98 percent.

Potential Limitations

Foam lifting is not suitable for every situation. If the concrete slab is badly cracked into multiple

pieces, foam may leak through the cracks rather than lifting the slab. If the slab has sunk more

than 3 inches, foam alone may not provide enough lift; we may need to combine foam with

slab replacement or use a different method. Also, foam lifting cannot repair damage caused by

frost heave (rare in Montgomery) or chemical reactions in the concrete. Montgomery

Foundation Repair Co will always give you an honest assessment of whether foam is the right

choice.

Frequently Asked Questions