Precision Meets Performance in Modern Foundation Engineering
Helical design for structural engineers is critical to trust and risk mitigation. In today’s demanding commercial construction environment, structural engineers face increasing pressure to design foundations that are not only strong and durable but also fast, cost-effective, and minimally invasive. That’s where helical piers come in.
At FnD Piers, we work alongside structural engineers across Texas to design and install helical pier systems tailored to each project’s soil conditions, load requirements, and long-term stability goals. If you’re a structural engineer tasked with specifying or evaluating helical piers, this guide is for you.
What Are Helical Piers?
Helical piers (also known as screw piles) are deep foundation elements composed of steel shafts with helical-shaped bearing plates. These piers are hydraulically rotated into the ground to specified depths and torques, anchoring the structure into load-bearing soil.
Their modular design allows for precise load capacity control, even in challenging soils or restricted-access job sites—making them a go-to solution for new construction, retrofits, and repair projects alike.
Key Engineering Considerations for Helical Pier Design
1. Soil Analysis
A thorough geotechnical report is essential. The soil profile determines:
- Installation depth
- Helix spacing and configuration
- Shaft type and diameter
- Expected corrosion rates
- Minimum required torque for capacity
At FnD Piers, we often collaborate with engineers to translate soil reports into torque recommendations using industry-accepted ICC-ES formulas. Learn more about how soil types impact helical pier performance in our service region.
2. Axial and Lateral Load Requirements
Each helical pier system should be designed based on:
- Dead and live loads
- Uplift and compression forces
- Lateral loading and bending moment resistance (when needed)
- Load combinations (per ASCE 7)
This ensures the foundation behaves predictably under both service loads and extreme conditions.
3. Pier Shaft Selection
The pier shaft must handle both torque during installation and structural load afterward. Options include:
- Square Shaft (Solid): Ideal for tension or rocky soils
- Round Shaft (Tubular): Better for compression and bending resistance
- Combo Systems: Use both to handle unique project needs
4. Corrosion Protection
For long-term durability, pier coating should match the soil’s corrosivity rating. Common options:
- Bare steel (short lifespan)
- Galvanized coating (zinc-based)
- Epoxy or polyurethane coatings
- Cathodic protection for severe cases
FnD Piers uses corrosion protection systems tailored to your site’s chemistry and lifespan requirements.
5. Torque-to-Capacity Correlation
Torque is the most accurate on-site performance indicator. Industry standard (per ICC-ES AC358):
Qall = KT × T
Where:
- Qall = allowable load
- K = empirical constant
- T = final installation torque
FnD Piers uses real-time torque monitoring to verify each pier meets its engineered capacity before we leave the site. Discover the step-by-step process of installing helical piers.
Ideal Applications for Engineered Helical Pier Design
- Commercial slab-on-grade buildings
- Retrofitting of aging structures
- Multi-family developments
- Light industrial buildings
- Cell towers, signs, solar farms
- Equipment pads and mezzanines
Ready to Collaborate on Your Next Project?
Helical design for structural engineers is critical because your build is only as good as the foundation beneath it. FnD Piers is your partner in delivering engineered helical pier systems that perform under pressure—on paper and in the field.
Want to learn more as a team?
FnD Piers can come to your office to deliver an in-person presentation on helical design for structural engineers, as well as installation, and case studies tailored to your firm’s needs.
Just let us know a date that works, and we’ll bring the knowledge and coffee.
Engineered. Installed. Proven.
