Treat the soil behind the wall, not just the wall.
Polyurethane injection binds loose backfill, fills the voids water carved out, and closes the paths that let pressure build, all through holes smaller than a coin.
Let's take the first step toward solid ground.
A local specialist will evaluate your foundation, walk you through the findings, and send a clear estimate. No cost, no pressure.
What to know about polyurethane injection, and when it's the right call.
Polyurethane injection starts as a liquid resin pumped through small ports drilled in or behind the wall. The resin follows the same paths the water did, which is exactly the point: it flows into the voids, seams, and loose zones that water erosion created, then expands and hardens into a rigid foam that locks the soil structure in place. Because the single component formula we use for retaining wall repair is triggered by soil moisture, expansion happens where the water problem lives, sealing the leaks and binding the saturated zones without generating the uncontrolled force that could damage the wall. Cured polyurethane is lightweight, so it stabilizes without adding surcharge load, and it is water resistant, so it does not erode or wash out the way soil fines and cement slurries can. Injection can also fill voids under a wall footing that has been undermined, restoring even support along the base. The crew monitors the wall and injection pressures throughout, and the work is verified against the starting measurements when the resin has cured. Injection treats the soil side of the problem; the wall side has its own tools. Cracks in the face are sealed and reinforced through retaining wall crack repair, a wall that has begun to rotate needs anchor reinforcement into stable ground, and a retaining wall inspection sorts out which side of the wall your problem lives on.
The symptoms that usually lead to polyurethane injection are on the retaining wall repair problem signs page, alongside the other signs that point to the same underlying cause.
How we install polyurethane injection.
Free evaluation
A specialist maps the wall's condition, locates voids and loose backfill, and traces how water is moving behind the wall. You get the findings in writing.
Set the injection ports
Small ports are drilled at engineered locations and depths so the resin reaches the voids and weak zones, not just the surface.
Inject and monitor
Single component polyurethane is pumped in stages while the crew monitors pressures and the wall itself, letting soil moisture drive controlled expansion.
Seal and verify
Ports are patched, drainage corrections are completed where water was feeding the problem, and results are checked against the starting measurements.
Polyurethane Injection on a real project.
Polyurethane injection binds loose backfill, fills the voids water carved out, and closes the paths that let pressure build, all through holes smaller than a coin.
Care and expertise from a team that's been doing this since 2011.
When the fix is polyurethane injection, the installer matters as much as the method. Dalinghaus crews handle foundation, concrete, and crawl space work across California, Arizona, and Nevada, and nothing else.
Foundation repair, concrete leveling, and crawl space repair are our entire focus. Not a sideline.
More than 2,000 projects on the clay and desert soils of California, Arizona, and Nevada since 2011.
CSLB License #983851 in California, ROC #330307 in Arizona, and License #0089738 in Nevada. Look us up with the state before we ever set foot on your property.
Warranty terms come in writing with every proposal, and the terms that apply to your job are stated in that job's paperwork. Ask your project specialist during the free evaluation.
Answers to common questions about Polyurethane Injection.
Don't see your question here? Our team is happy to help. Reach out anytime.
It fixes the ground the wall is fighting with. The resin fills the voids water carved out, binds loose backfill into a stable mass, and seals the paths that let water pool against the wall. That means less soil migration, less hydrostatic pressure, and even support restored under an undermined footing, all of which lowers the load on the wall itself.
Other retaining wall repair solutions we install.
Every solution is engineered for a specific soil profile and failure mode. Browse the full toolkit.
Anchor Reinforcement
Anchor reinforcement, with helical tiebacks, wall anchors, and soil nails, reaches past the failing backfill into ground that does not move, then pulls the wall back toward plumb and keeps it there.
Learn more
Carbon Fiber Installation
Carbon fiber installation bonds straps to a cracked or bowing retaining wall. They refuse to stretch, so the crack stops spreading and the wall face stays together under load.
Learn more
Retaining Wall Anchoring Systems
Anchoring systems tie a leaning retaining wall into stable ground beyond the soil that is pushing it, stopping the movement for a fraction of the cost and disruption of demolition.
Learn moreFrom free evaluation to installed polyurethane injection.
How a polyurethane injection project moves from diagnosis to completed installation.
Schedule your free evaluation.
A local specialist visits your home, evaluates the foundation, and answers your questions on site. No cost, no obligation.
Receive an estimate based on your needs.
We provide a clear, written estimate with a scope of work tailored to your home's specific issues.
Get your repairs.
Our crews complete the work on schedule, with the findings and scope in writing from the first visit.
More than 1,000 Google reviews across our offices, averaging 4.9 stars.
Before you choose who installs your polyurethane injection, read how homeowners across California and Arizona rate our work.
Start with a free evaluation.
Share a few details and a local specialist will follow up as soon as possible to set your evaluation.
- A local foundation specialist on site
- A complete walk-through of the findings
- A clear written estimate at no cost
- No obligation, no pressure
Not sure which service you need?
A free evaluation covers all of it: one visit, clear findings, written estimate.