The choice between polyurethane foam and steel piers depends on whether you are looking for a surface-level lift or a permanent structural solution. While both address settlement, they serve very different purposes:
- Polyurethane Foam Injection: This method, often called slab jacking, is a fast, non-structural solution for leveling minor settlement (typically less than 2 inches) in interior slabs, sidewalks, or driveways. It cures in about 15 minutes and is effective for filling voids, but it does not provide long-term structural support for heavy loads.
- Steel Piers (Helical or Push Piers): These are the industry standard for permanent foundation underpinning. Our steel piers transfer the building’s weight past unstable surface soils down to competent bearing strata or bedrock. They offer a superior load-bearing capacity of over 100 tons per pier, compared to the under-20-ton limit of foam.
When to choose steel piers:
We recommend engineered steel systems for perimeter foundations, load-bearing walls, and any commercial structures where structural stability is mandatory. While foam has a lower initial cost, steel piers provide a permanent solution backed by ICC-ES documentation and ISO-certified quality. This ensures your foundation remains stable even in expansive clay or high-moisture soils that often cause temporary solutions to fail.
Every project requires a site-specific evaluation to determine the best approach. Consult a structural engineer or our manufacturer’s engineering team for project-specific design and installation guidance to ensure your repair complies with applicable building codes.
Related FAQs
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What is the Relationship between Installation Torque and Soil Bearing Capacity?
Read More »: What is the Relationship between Installation Torque and Soil Bearing Capacity?Installation torque is used as a real-time indicator of soil bearing capacity because the rotational resistance encountered by the helix plates reflects the soil’s shear strength. As the helical pier advances into competent strata, the torque required to turn it…
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How do Engineers Calculate the Ultimate Geotechnical Capacity of a Helical Pile?
Read More »: How do Engineers Calculate the Ultimate Geotechnical Capacity of a Helical Pile?To calculate the ultimate geotechnical capacity of a helical pile, we utilize two primary methodologies: the individual bearing method and the torque factor method. These approaches allow us to ensure structural loads are successfully transferred to competent bearing strata. $Q_{ult}…
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Why is a Geotechnical Investigation Necessary to Verify Soil Bearing Capacity?
Read More »: Why is a Geotechnical Investigation Necessary to Verify Soil Bearing Capacity?A geotechnical investigation is essential because it provides the site-specific data required to identify competent bearing strata and accurately size helical pier systems. Relying on general benchmarks is insufficient because actual soil bearing capacity varies significantly based on moisture content,…
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How is the Soil Bearing Capacity Determined for Helical Pier Installation?
Read More »: How is the Soil Bearing Capacity Determined for Helical Pier Installation?To ensure long-term structural stability, we determine soil bearing capacity through a combination of upfront geotechnical investigations and real-time field verification during installation. Geotechnical Investigation Before installation begins, we recommend a site-specific geotechnical report to map the soil profile. This…
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Does the Water Table Level Affect the Soil Bearing Capacity for Helical Piers?
Read More »: Does the Water Table Level Affect the Soil Bearing Capacity for Helical Piers?Yes, groundwater fluctuations are a critical factor in determining soil bearing capacity. A rising water table reduces the effective stress and overall strength of the soil, which in turn diminishes the load capacity of a helical pier. Because groundwater levels…