Property Overview

• Location: St. Pete Beach, Florida (Pinellas County)
• Structure Type: Residential single-family home
• Project Objective: Install a deep foundation system capable of supporting a second-story addition
• Foundation Concern: Loose sandy soils identified by geotechnical testing

The homeowner planned a major renovation: adding a second floor to the existing structure. While the home had performed adequately under its original load, adding an additional story significantly increases the weight placed on the foundation system.

Before construction could begin, a geotechnical investigation was conducted. The Standard Penetration Test (SPT) test results indicated loose, sandy soils below the structure, a common condition in coastal areas like St. Pete Beach. Sandy soils often lack sufficient density and bearing capacity to support increased structural loads.

Without intervention, these conditions could lead to:

• Structural settlement
• Foundation cracking
• Floor slope or structural misalignment
• Long-term damage to the new addition

Because of these risks, the homeowner needed a reliable foundation repair solution that would stabilize the existing structure while preparing the home for the additional load.

Understanding Coastal Soil Conditions in St. Pete Beach

Coastal properties in Pinellas County and the greater Tampa Bay area are frequently built on sandy barrier island soils. While these soils drain well, they often lack the density needed to support heavy structural loads.

Over time, environmental conditions can further impact these soils, including:

• Heavy rainfall
• Storm surge
• Hurricanes
• Groundwater fluctuation
• Soil erosion

In this case, the property had experienced recent hurricane activity from Hurricanes Helene and Milton, which may have further disturbed the subsurface soils. These conditions reinforced the need for a professional foundation repair and stabilization solution before adding the new story.

Although the engineering solution was clear, the project presented several logistical challenges that required expertise and careful planning.

Tight Construction Access

Helical pier installation typically requires a hydraulic drive motor mounted on specialized equipment. However, portions of the home provided very limited access space, making it difficult to position the drilling equipment.

Helicon’s experienced installation team adjusted their equipment setup to work within these constraints while still maintaining the precision required for proper pier installation.

Interior Installation Requirements

Some of the helical piers needed to be installed inside the home to properly support the existing structure and future addition. Working inside a residential property requires extra care to protect interior finishes, flooring, and structural components.

Helicon crews carefully staged equipment and maintained a clean work environment to ensure minimal disruption to the homeowner.

Structural Integration with Future Construction

The deep foundation system had to be designed not only to stabilize the existing structure but also to integrate seamlessly with the future second-story construction plans. Proper pier placement and load capacity were critical to achieving this goal.

After evaluating soil conditions and structural requirements, Helicon recommended installing galvanized steel helical piers as the primary foundation repair solution.

Helical piers are widely used in foundation repair because they allow engineers to transfer structural loads from weak surface soils to deeper, stronger load‑bearing layers.

How Helical Piers Work

Helical piers are advanced into the ground by rotating them like a screw until they reach competent soil layers capable of supporting structural loads.

Each pier consists of:

• A steel shaft
• Helical plates (also called helices)
• A bracket connecting the pier to the foundation

Once installed, the pier provides a stable support column beneath the structure.

Installation Details

For this project, Helicon installed 24 galvanized steel helical piers using an 8‑10‑12 helix configuration.

Why the 8‑10‑12 Helix Configuration Matters

The helix size sequence refers to the diameter of the helical plates attached to the shaft.

Using multiple helix sizes helps the pier:

• Penetrate through variable soil layers
• Achieve optimal torque resistance
• Provide greater load capacity

This configuration is commonly used in foundation repair projects where deeper soils are required for structural stability.

Installation Process

1. Pier Locations Established Engineers and installers mapped exact pier locations based on structural load requirements.
2. Hydraulic Torque Installation Each pier was rotated into the ground using a hydraulic drive motor until reaching the target torque value.
3. Load Capacity Verification Torque readings confirmed the pier had reached competent bearing soils capable of supporting the structure.
4. Foundation Bracket Attachment Steel brackets were attached to connect the piers to the existing foundation.
5. Structural Load Transfer The foundation load was transferred from the shallow soils to the deep helical pier system.

Results and Structural Benefits

Following installation, the home now rests on a deep foundation system specifically engineered for the site’s soil conditions.

Key Benefits of This Foundation Repair

• Increased foundation load capacity
• Protection against future settlement
• Stability during extreme storm events
• Long-term structural support for the second story
• Reduced risk of foundation cracking

By installing the helical pier system before construction begins, Helicon ensured the home will remain stable for decades.

Why Helical Piers Are Ideal for Coastal Foundation Repair

Helical piers are particularly effective in coastal environments like St. Pete Beach and Tampa Bay because they:

• Bypass weak sandy soils
• Resist uplift forces during storms
• Provide immediate load-bearing capacity
• Require minimal excavation
• Work well in confined spaces

For homes undergoing major renovations or additions, helical piers offer one of the most reliable foundation repair solutions available today.

About Helicon

Helicon is Florida’s trusted expert in foundation repair, soil stabilization, helical pier installation, concrete lifting, and sinkhole remediation. Serving homeowners throughout St. Pete Beach, Pinellas County, and the greater Tampa Bay region, Helicon delivers engineered structural solutions that protect homes from the ground up.

If you are planning a home addition or noticing signs of settlement such as cracks, sloping floors, or foundation movement, it may be time for a professional foundation repair inspection.

Helicon provides advanced foundation repair solutions throughout Tampa Bay, helping homeowners stabilize their structures and protect their investments.

Call 844‑HELICON today to schedule your free foundation repair inspection.