Imagine you’re standing in your driveway, coffee in hand, when you notice the corner of the concrete slab has sunk a good two inches. It’s like your driveway decided to take a nap without asking. If you’ve ever stared down a sunken slab and wondered, “How on Earth do I fix this?”—you’re in the right place. Welcome to your straightforward, no-nonsense guide on raising concrete with foam. We’re talking about foam jacking—aka polyurethane concrete raising—a modern slabjacking solution that’s faster, cleaner, and way less messy than those old mudjacking days.
Why Sunken Concrete Matters—and Why You Should Care
Sunken concrete isn’t just an eyesore. It creates trip hazards, water pooling, and can even signal deeper foundation settling or soil issues. Left unchecked, a small dip can turn into a major crack, forcing you into a full-blown replacement—costly in both time and money. That’s where concrete leveling comes in.
What Is Foam Jacking? (AKA Polyurethane Concrete Raising)
Foam jacking is a cutting-edge mudjacking alternative that pumps expanding polyurethane foam beneath a sunken slab. As the foam expands, it gently lifts the concrete back to its original level—think of it like inflating a very slow, very strong balloon under your driveway. Once the foam cures (in about 15–20 minutes), it hardens into a rock-solid base that fills voids under the slab and helps prevent future settlement.
Diagnosing Your Sunken Concrete: What to Look For
Before you dive into foam jacking, you need to assess the problem. Here’s a quick checklist:
- Cracks Around the Slab
Small cracks at the edge can mean the slab is shifting. Foam jacking can close these gaps by raising the slab. - Pooling Water
If rainwater or sprinkler runoff gathers in dips, you’ll see algae or discoloration. That’s a sign the slab isn’t draining properly. - Trip Hazards
Any difference of more than a half-inch between adjoining slabs is dangerous—and often illegal—because it violates many local building codes. - Misaligned Door Frames or Garage Doors
If your garage door isn’t sliding smoothly, a tilted or uneven concrete floor could be to blame. When one side of the slab settles lower than the other, it can shift the door frame out of square. - Cracked Tile or Foundation Gaps
Interior tiles cracking near an exterior slab can indicate foundation leveling issues that need attention.
Step-by-Step: How Foam Jacking Lifts Your Slab
Here’s how the pros do it:
- Small Drill Holes
We drill dime-sized holes through the concrete in the affected area. Don’t worry. They’re barely noticeable afterward. - Probe and Void Check
A small rod probes under the slab to gauge how far down the voids go and how saturated the soil is. - Foam Injection
Polyurethane foam is injected through the holes. The foam expands—about 20 times its liquid volume—filling voids and lifting the slab. Crews monitor the slab’s elevation, stopping when it matches the surrounding concrete. - Level and Seal
After the foam cures (in about 15–20 minutes), the injection holes are patched with a color-matched grout. - Final Inspection
Technicians check the lift, ensure proper drainage, and confirm there are no residual cracks or over-pressurization.
Benefits of Raising Concrete with Foam
- Fast Cure: Back to walking on it in under an hour.
- Lightweight: Foam weighs about 2 pounds per cubic foot, versus 120 for mudjacking slurry—so no extra load on the soil.
- Minimal Disruption: No mud puddles, no heavy trucks, no slurry cleanup.
- Long-Lasting: Foam resists water absorption, so it won’t wash out like traditional mudjacking material.
- Eco-Friendly: Foams are formulated with minimal VOCs and certified safe for soil contact.
When Foam Jacking May Not Be Enough
While foam jacking is a versatile sunken concrete fix, there are situations where additional measures—or a different approach—are warranted:
- Severe Structural Settlement
If a concrete foundation has dropped more than a few inches due to expansive clay soil, you may need foundation leveling with helical piers. - Poor Soil Bearing Capacity
Loose, sandy soils sometimes require stabilization (deep soil compaction) before foam injection can hold. - Drainage Failures
If water runoff is consistently draining toward the slab, you’ll need to address grading or install a French drain to prevent repeat settlement. Foam concrete repair alone won’t stop water flow.
DIY vs. Professional Concrete Slab Lifting
Sure, watching a foam injection video on YouTube makes it look easy. But consider this your friendly warning: improper injection can create uneven lifts, crack your slab, or leave voids to collapse later. Professionals have:
- Calibrated Injection Rates: High pressure at low volume, preventing “overlift.”
- Soil Expertise: They assess soil type and the water table before injection.
- Warranty Backing: APS’s warranty covers re-leveling if the slab settles more than ¼ inch within three years.
How APS Does Foam Jacking Differently
At APS Foundation Repair, we’ve been raising concrete with foam since 1977. Here’s our promise:
- Free On-Site Assessment
We start with a no-cost inspection—complete with laser level measurements—to determine if foam jacking is your best, most cost-effective option. - Customized Solutions
Every slab, driveway, or patio gets a tailored lift plan. That means precise hole placement and foam volume, maximizing lift without compromising integrity. - Transparent Pricing
No hidden fees for hole patching or soil prep. You get a detailed estimate up front. - Lifetime Service
APS offers a three-year warranty on foam lifts—and we’ll inspect your slab annually to ensure it stays level. - Local Expertise
Our technicians know the Gulf Coast’s expansive soils inside and out. We adjust foam formulation and injection technique to match regional soil quirks.
Your Simple Plan to a Level Surface
- Call APS at 1-800-APS-FIX-IT for your free assessment.
- Schedule Injection—most jobs wrap up in a few hours.
- Enjoy Safe, Level Concrete—no more tripping hazards or puddles.
Ready to Ditch the Dip?
Don’t let sunken concrete drive you nuts. With foam jacking, you get a quick, clean, and lasting solution that makes old-school mudjacking look like the Stone Age.
Call APS Foundation Repair today at 1-800-APS-FIX-IT or visit apsfoundationrepair.com to schedule your free inspection.
Let’s lift, level, and seal your concrete so you can get back to what matters—living life on solid ground.
