Helical Piers vs. Engineered Fill

The practical and engineering advantage of using helical piers rather than placing engineered fill to achieve subgrade support for your new residential or commercial build. Helical piers are a deep foundation solution installed by rotating steel shafts with helical bearing plates to competent soil strata, providing immediate load support and a means to verify capacity during installation.

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Key benefits of helical piers (relative to engineered fill)

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• Immediate load capacity (no curing/wait time): Once the target torque and embedment are achieved, helical piers can typically be loaded right way, helping keep the project on schedule.

• Verifiable performance during installation: Installation torque monitoring provides a practical method to confirm that the installed pier is achieving the intended capacity, reducing uncertainty compared with relying soley on near-surface compaction results.

• Reduced risk of settlement tied to moisture/compaction variability: Engineered fill performance depends on meeting density and moisture requirements in each lift; deviations can contribute to post-construction settlement or loss of stiffness. Helical piers bypass problematic near-surface soils and transfer load to deeper, more reliable bearing layers.

• Minimal excavation, spoil, and site disturbance: Helical piers are installed with limited excavation and reduced soil displacement, which can be advantageous on constrained sties and can reduce hauling and restoration needs.

• Lower noise/vibration than mass earthwork: Helical piers are installed by torque (rotation) rather than driving, and are commonly described as a low-vibration option.

• Schedule reliability in difficult weather/groundwater conditions: Because helical systems generally avoid large open excavations and do not rely on curing time, they are often selected to reduce weather-related delays and sequencing constraints.

• Adaptability to variable subsurface conditions: Helical piers can be advanced to the depth required to achieve capacity, helping manage layered soils and variable fill conditions encountered across a site.

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                               Considerations with engineered fill

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          Engineered fill can be an appropriate solution when there is 

          adequate room and time for over-excavation, placement in                      controlled lifts, and thorough QA/QC testing. However,                              achieving consistent results depends on maintaining proper                  moisture content, lift thickness, equipment selection, and                        verification testing across the entire footprint conditions that                can be difficult to maintain in wet seasons, tight access areas,                or when working adjacent to existing improvements.

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