Property Overview

• Location: Cape Coral, FL (Lee County)
• Structure: Single-family residence
• Primary Concern Area: Right-side corner of the home wrapping toward the lanai
• Interior Condition: Small wet area near the corner; carpet to be removed or pulled back for injection access

Observed Symptoms

1. Hairline staircase cracks along the right-side exterior wall
2. Cracks are continuing around the rear corner toward the lanai
3. Localized soil washout and visible voiding at the exterior corner
4. Minor hairline cracking at the front of the house (proactively addressed)
5. Interior slab moisture in the affected corner (no flooding history)

The cracking was primarily cosmetic at this stage, but the combination of washout and stair‑step cracking indicated differential settlement localized to that corner.

Root Cause Analysis

Cape Coral’s soils are predominantly sandy and highly susceptible to erosion when exposed to concentrated water discharge. When roof runoff is not properly managed, water can:

• Wash fines from beneath shallow footers
• Create localized voids beneath slab edges
• Reduce confinement in the near-surface bearing zone
• Cause gradual differential settlement

In this case, the homeowner had recently replaced a broken gutter that had allowed roof water to flow directly toward the affected corner. Although the drainage issue had been corrected, the damage to the supporting soils had already occurred.

Importantly, the homeowner understood that water intrusion is not warrantable and that water will travel wherever it finds a path. The objective was stabilization—not waterproofing.

Several obstacles required careful planning and precision during installation:

• Septic tank location near injection zones
• Irrigation lines throughout the landscape
• Thorny bushes along the right-side wall
• Existing pool plumbing lines near the lanai
• Limited interior working area (small 4 ft x 5 ft corner section)

Additionally, the scope required balancing interior and exterior injections while ensuring minimal disruption to flooring and landscaping.

Two-Part Structural Polyurethane

Helicon implemented a multi-zone stabilization plan utilizing two-part structural polyurethane injections for both soil densification and slab contact restoration.

Interior Slab Stabilization

To address the small 4 ft x 5 ft interior corner:

• 6 pounds of interior slab injections were installed
• Carpet to be removed or pulled back for access
• Focus: stabilize soils beneath slab edge and reduce potential further settlement

These injections were intentionally conservative and controlled, given the limited area and active living space.

Exterior Slab & Soil Stabilization

Exterior injections focused on densifying supporting soils and halting further washout around the corner and along the right-side wall.

Regular Slab Injections:
– 34 pounds of structural polyurethane
– Restored slab-to-soil contact

Chemical Grout Injections (Corner Support):
– 8 injection points
– 400 pounds total material
– Targeted deep void zones and erosion pockets

LF-20 Injections:
– 17 injection points
– 340 pounds total
– Designed for controlled soil densification in moderate void conditions

LF-50 Injections:
– 12 injection points
– 600 pounds total
– Higher-density stabilization for deeper or more compromised zones

Total Polyurethane Installed

Across all zones and materials, this project required a substantial volume of product to ensure proper soil stabilization and load transfer.

Why Polyurethane Was the Right Choice

For Cape Coral’s sandy, moisture-sensitive soils, two-part structural polyurethane offers several advantages:

• Lightweight and does not add excessive dead load
• Expands into voids and weak zones
• Cures rapidly for same-day service
• Minimal disruption to landscaping and flooring
• Ideal for localized corner stabilization

Traditional cementitious grouting would have introduced additional weight and may not have penetrated irregular washout zones effectively.

Results & Benefits

• Concrete Repair and Foundation Repair
• Further settlement was prevented at treated zones
• Corner bearing capacity significantly improved
• Exterior washout areas stabilized
• Interior corner prepared for future flooring replacement
• Front hairline cracks addressed proactively

While hairline cracks may still require cosmetic patching, the structural support beneath them has now been reinforced.

Long-Term Recommendations

To protect the stabilized area long-term, Helicon recommended:

1. Maintain functional gutters and proper downspout extensions
2. Ensure positive grading away from foundation walls
3. Monitor irrigation to avoid oversaturation near the foundation
4. Repair cosmetic cracks only after stabilization is complete
5. Remove thorny bushes if future inspection access is needed

About Helicon

Helicon is Florida’s trusted leader in foundation repair, soil stabilization, concrete lifting, and sinkhole remediation. We proudly serve homeowners throughout Lee County and Southwest Florida, delivering engineered solutions that protect homes from the ground up.

If you’re noticing stair-step cracks, corner settlement, or soil washout around your home in Cape Coral or Fort Myers, don’t wait until minor movement becomes major structural damage. Helicon’s soil stabilization and foundation repair solutions are designed specifically for Florida’s sandy soils.

Call 844-HELICON today to schedule your free foundation inspection.