Trusted Foundation Repair of Arizona
Trusted Foundation Repair of Arizona
When the Ground Itself Is the Problem
Most foundation and concrete problems you see at the surface have the same root cause: the soil underneath isn’t doing its job. Stable soil supports structures evenly. Unstable soil - whether it’s loose, saturated, or full of voids - allows structures above it to shift, crack, and sink.
Soil stabilization is the process of chemically or mechanically treating the ground beneath a structure to increase its density, load-bearing capacity, and resistance to water movement. At Trusted Foundation Repair of Arizona, we use soil stabilization as both a standalone solution and as part of a broader foundation repair approach.
What Causes Soil Instability in Arizona?
Expansive clay: Arizona’s heavy clay soils swell dramatically when wet and shrink when dry, creating cyclical movement beneath foundations
Caliche layers: The calcium carbonate hardpan found across much of Phoenix and Scottsdale can create unpredictable drainage patterns that erode softer soils below
Monsoon saturation: Arizona’s intense summer storms deliver large volumes of water rapidly, which can saturate soils and wash away fines under slabs and footings
Construction over fill soil: Many Arizona subdivisions were built on fill material that was never properly compacted
Underground water leaks: Slow leaks from irrigation lines, pool plumbing, or utility lines can erode soil cavities beneath structures
If your concrete keeps settling or your foundation keeps moving, the problem isn’t the concrete — it’s what’s underneath it.
Call (602) 480-8140 for a FREE on-site evaluation.
Our Soil Stabilization Methods
Polyurethane Foam Injection
High-density polyurethane foam is injected into the soil through small drill holes. As it expands and cures, it fills voids, binds loose particles together, and creates a rigid, water-resistant mass that stabilizes the ground. This method is precise, fast, and minimally invasive — perfect for residential applications.
Chemical Soil Treatment
For large-area soil stabilization — particularly expansive clay soils — we inject chemical compounds (typically lime- or cement-based grouts) that react with the soil to reduce its plasticity and potential to swell. The result is a more uniform, stable base that resists movement through Arizona’s wet and dry cycles.
Compaction Grouting
A thick, controlled mixture is pumped into the soil under pressure, compacting loose material and displacing weak zones. This method is especially effective in areas with mixed-fill soils or where previous construction has left air pockets in the soil column.
Frequently Asked Questions - Soil Stabilization
Q: How do I know if I need soil stabilization vs. just concrete lifting?
A: If your concrete has only settled once and the underlying cause (poor drainage, one-time erosion) has been fixed, concrete lifting alone may be sufficient. If the same slab has settled multiple times, or if a void is confirmed beneath it, soil stabilization addresses the root cause. We assess this during the free estimate.
Q: How long does a soil stabilization treatment last?
A: Polyurethane foam and chemical stabilization treatments are intended to be permanent. Unlike physical fill materials, the treated soil or the foam mass won’t wash away, compress, or break down under normal conditions.
Q: Will soil stabilization affect my landscaping?
A: The process involves small drill holes and minimal surface disruption. Foam injection, especially, is very precise and typically causes no lasting impact to surrounding landscaping.
Q: Can soil stabilization be done under an existing structure?
A: Yes. That’s one of its primary advantages. Unlike excavation-based methods, injection treatments can be applied directly through a slab or alongside a footing without demolishing anything above.