FAQs
What is torque correlation in helical pile installation?
Torque correlation refers to the relationship between the torque required to install the pile and the pile’s load-bearing capacity. Higher torque generally indicates higher bearing strength, and engineers use these readings to verify performance.
How deep do helical piles need to go?
Depth is determined by soil conditions and load requirements. Piles typically extend until they reach competent soil or achieve target installation torque—often between 10 to 30 feet deep, but sometimes deeper.
What are the allowable loads for helical piles and ground screws?
Helical piles can support loads ranging from a few thousand to over 100,000 pounds depending on pile size, soil conditions, and installation depth. Ground screws typically support lighter loads up to 5,000–10,000 pounds.
Are load tests required?
For critical structures, yes. Load testing (compression, tension, and lateral) may be required to confirm design assumptions and ensure compliance with engineering specifications and code.
What are helical piles?
Helical piles are steel shafts with helix-shaped plates welded to them. They are screwed into the ground to provide deep foundation support for structures on unstable soil.
What are ground screws?
Ground screws are similar to helical piles but typically used for lighter loads. They screw directly into the soil and can support decks, fences, solar panels, and small buildings.
When should I consider using helical piles or ground screws?
They are ideal when the soil is weak, prone to shifting, or when access is limited. They’re commonly used for foundation repair, new builds, decks, and additions.
How long do helical piles and ground screws last?
Properly installed and galvanized helical piles and ground screws can last 50+ years, depending on soil conditions and load requirements.
Are they code compliant?
Yes. Helical piles and ground screws are ICC-certified and meet most local building codes when installed by qualified professionals.
How are they installed?
Both systems are installed using hydraulic or torque-driven machinery that rotates them into the ground with minimal soil disturbance—no digging or concrete required.
Are they better than traditional concrete footings?
In many cases, yes. They install faster, require less site prep, can be used in poor soil conditions, and are ready to build on immediately after installation.