The ICC-ES AC358 (Acceptance Criteria for Helical Pile Systems) provides the essential framework we use to evaluate and verify helical pile lateral resistance. Unlike standard design tables, AC358 evaluation reports are based on results from full-scale testing conducted by accredited laboratories.

According to these standards, the evaluation process involves several critical factors:

• Full-Scale Testing: Lateral capacity is determined through testing under controlled conditions, focusing on the interface between the pile and the supported structure.
• Connection Assembly Assessment: The standards require an evaluation of connection assemblies—such as reinforced concrete caps or steel brackets—to confirm their ability to transfer lateral loads effectively.
• Independent Validation: Evidence of compliance means that the lateral load values for a specific pile system have been evaluated and published by an independent third party.
• Field Verification via Torque: Once an AC358 evaluation establishes code-compliant capacity, we record installation torque in the field. These torque records serve as the practical link (QA/QC) between laboratory evaluation and the as-installed foundation, demonstrating that the piles have engaged the soil sufficiently to achieve the required resistance.

While AC358 determines the tested limits of the product, we emphasize that final installed capacity always depends on site-specific soil conditions. All information is for general purposes, and we recommend consulting a licensed structural engineer for definitive design recommendations. Actual outcomes depend on site conditions and inspections.

• Helical Pile Lateral Load Capacity: ICC-ES Standards Guide