How to Fix Erosion Behind a Seawall with Polyurethane Foam

If you live along the water — in places like Port Huron, MI or anywhere with shoreline property — your seawall is your first line of defense. It protects your land from wave damage, storm surge, and long-term erosion. But what happens when the land behind the seawall starts to erode?

That kind of soil loss can put your property — and the seawall itself — at serious risk.

At Foam All, we specialize in repairing seawall erosion using polyurethane foam injection. It’s a fast, effective solution that stabilizes the ground, supports your seawall, and prevents future damage.

Why Does Erosion Happen Behind a Seawall?

Even with a solid seawall, erosion can still occur behind it. Over time, water finds its way through joints, cracks, or gaps, washing away the soil that supports the wall. This leads to:

Voids or sinkholes behind the seawall
Settling patios, sidewalks, or landscaping near the water
Cracking or leaning of the seawall itself
Water pooling in areas it shouldn’t

If you’re noticing soft spots, dips, or visible voids behind your seawall, don’t wait. That’s a clear sign that the soil is eroding and needs to be reinforced.

The Solution: Polyurethane Foam Injection

Foam All uses high-density polyurethane foam to repair erosion behind seawalls. Here’s how it works:

Inspection & Assessment: We evaluate your seawall and identify areas where soil has washed out or destabilized.
Targeted Injection: We drill small holes and inject expanding foam into the voids and surrounding soil.
Stabilization: The foam expands and hardens, bonding with the surrounding soil and filling empty pockets.
Long-Term Support: The cured foam is waterproof, inert, and long-lasting — providing structural support for years to come.

This process doesn’t require heavy equipment or digging, and the repair is usually complete within a day.

Why Choose Polyurethane Foam for Seawall Repair?

Fast, Non-Invasive Repairs No need to tear out landscaping or rip up concrete.
Waterproof and Durable The foam won’t break down over time or absorb moisture like traditional fill materials.
Environmentally Safe The foam used is non-toxic and safe for use near water.
Prevents Future Erosion Once in place, it creates a strong, permanent barrier against further soil loss.

When Should You Call for a Seawall Inspection?

You don’t have to wait for visible damage to act. Call Foam All if you notice:

Soil loss or depressions behind your seawall
Cracks in sidewalks, driveways, or patios near the water
Standing water where it didn’t used to collect
Any shifting or leaning of the seawall

Get a Free Estimate from Foam All

If you’re dealing with erosion behind a seawall in Michigan or surrounding areas, Foam All is here to help. Our polyurethane foam injection services offer a long-lasting, cost-effective solution that restores stability without major construction.

Schedule An Inspection

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FOR Foam All, FIVE-STAR REVIEWS ARE STANDARD

Customers in Port Huron, Richmond, Chesterfield Township, and across St. Clair, Macomb, and Sanilac Counties appreciate our spray foam service.

Fast, Friendly Service for Pole Barn Insulation

Their guys did a great job spray foaming a section of our pole barn. Also communication with office staff was great and they even got my job done 3 weeks sooner than it was scheduled!!!

Craig Orignalostoni
Great Communication from Technicians on Crawl Space and Barn Insulation

The crew is very professional. They did a crawl space under the house and a 40x60 pole barn. Communication was great, on time, discussed any needed information, and did a great job. Thank you too to Melissa, the office manager who sent out the invoice. It was easy to pay directly from the invoice.

Maryjean Schenk
Driveway Leveling that Went Above and Beyond

Foam All is such a great company. With it being winter, I contacted them to give me an estimate on my driveway to be lifted. They went above and beyond and worked me into the schedule and got it done the same day. Thanks for your time and I will be referring more people your way. The driveway looks amazing and the employees you sent to do the installation were very professional and made my property look better than they found it.

Randy Wiley
Competitive Quote and Flawless Spray Foam Work

I highly recommend Foam All for a job well done. Incredibly prompt with a quote that was very competitive and responded with all questions. Their team arrived on time to spray the walls and the job is perfect. They even cleaned everything before leaving. A 5 star no worries contractor.

Dave Swantek
Fast, Professional Concrete Leveling

They were hired to raise my concrete. I had 7 areas in need of repair. The sidewalk where my AC unit was sitting had sunk 7 in. And was very concerned about the unit. They were GREAT. They leveled out the sidewalk plus leveled out all other areas as well. They were quick, professional, and did a wonderful job. I am very impressed. They will be back next year to spray foam my pole barn workshop.

Jim Carden