Licensed & Insured · CBC1267322 Serving FL, GA & AL 855-227-0300
BBB Accredited Business, A+ Rating 25 Years of Experience Financing Available Lifetime Warranty
Solid Foundations crew excavating for a foundation pier installation
Void Filling · Florida, Georgia & Alabama

Void Filling

Voids under a concrete slab lead to sinking, cracking, and settling — we fill them with high-strength structural polyurethane foam and put your slab back on solid ground.

Call 855-227-0300

Free, No-Obligation

Request a Free Estimate

Tell us about the slab or void you're concerned about and we'll follow up to schedule a free evaluation.

Prefer to talk now? Call 855-227-0300

We'll only use this to follow up about your estimate.

Have expectations? We meet 'em — Solid Foundations team Solid Foundations crew members — see what others are saying about us
Structural polyurethane foam being injected under a concrete slab to fill a void Solid Foundations technician injecting polyurethane foam beneath a pool deck Solid Foundations technician preparing a void filling injection on a residential driveway
Solid Foundations

Void Filling for Florida, Georgia & Alabama Properties

In and around our homes and businesses, we find concrete slabs that support the work we do and the lives we live — foundations, garage floors, patios, pool decks, porches, driveways, sidewalks, and more. Those slabs can only stay strong as long as the ground beneath them stays firm and level. When the soil under a concrete slab shifts or settles, a void opens up underneath, and a slab with a void beneath it is prone to moving, sinking, cracking, or crumbling. Solid Foundations offers void filling services that put your concrete slab back on solid ground.

The Causes of Voids

  • Poorly compacted soil
  • Decaying organic materials
  • Shrinking and swelling cycles
  • Freezing and thawing cycles
  • Burrowing animals
  • Heavy equipment
  • Vibrations

These factors lead to settled soil, a sinking slab, broken concrete, and property damage — or worse, a safety hazard. To prevent that and secure your concrete slab, call the void filling professionals at Solid Foundations.

Cutaway illustration of a void forming under a driveway slab from water intrusion and root damage

Our Standard: Structural Polyurethane Foam

Other foundation repair companies address voids with methods like mud jacking or slab jacking. Solid Foundations holds a higher standard: we fill voids with high-strength structural polyurethane foam. When injected into a void, the foam displaces air pockets, water, and water-saturated material to stabilize the slab and supply uniform support underneath it.

Structural polyurethane foam being injected under a concrete slab to fill a void

Why Polyurethane Foam

Our polyurethane foams, from Prime Resins, are built for this job. They're lightweight but high-density, and once cured, they never lose that density — staying impermeable to moisture and unaffected by erosion for years. They also have a high expansion ratio, expanding 10 to 20 times their original size, so the foam fills a void completely and eliminates any rocking or vibrating afterward. That expansion rate lets us fill a void through smaller, fewer holes drilled into your slab. The foam is injected as a liquid and reaches its final volume in about fifteen seconds, so a large space gets filled quickly and with minimal disruption to your property.

Before and after comparison of a void under a slab, empty and then filled with polyurethane foam

The Benefits of Void Filling

  • Supports the concrete at up to 7,200 lbs. per square foot
  • A durable fill unaffected by water content
  • Permanent retention of foam density
  • Lower cost than full concrete replacement
  • A rapid curing time
  • No color change to the concrete
  • No damage to surrounding grass or landscaping
  • You can walk on the concrete again almost immediately
Solid Foundations technician injecting polyurethane foam beneath a pool deck

Our Commitment

Our team has extensive experience with both compaction grouting and permeation grouting, and we use polyurethane foam because it's the material we trust most for the job. Our goal is a permanent fix, not a temporary patch — so you get lasting confidence in your concrete and the peace of mind to get back to normal. To learn more about voids under your slab or to schedule an evaluation, contact Solid Foundations today.

Solid Foundations technician talking with a homeowner beside the company truck and trailer
Stay Connected

Follow Solid Foundations

Real jobs, real crews, real customers — see more of it on social media.