Which Pier System is Best for Underpinning a Sinking Foundation?

Selecting the best pier system for a sinking foundation depends on several project-specific factors, including soil conditions, structural loads, and accessibility. Both push piers and helical piers offer reliable underpinning solutions, but they function differently:

• Push Piers: These are often considered the ideal solution for heavy commercial structures or residential projects where a firm bearing layer (like bedrock) is reachable at a predictable depth. They are hydraulically driven into the soil using the structure’s own weight until they reach competent strata. They provide robust support and strong load transfer with minimal long-term settlement.
• Helical Piers: These are highly versatile and often preferred for residential projects or lighter load applications. Because they are screwed into the ground using torque-driven plates, they achieve immediate load capacity and require less invasive equipment. They perform exceptionally well in various soil profiles, including sandy or silty conditions, and are ideal for areas requiring low vibration.

Ultimately, the "best" system is determined by a geotechnical evaluation. Push piers excel in reaching deep, dense bearing layers for heavy loads, while helical piers offer faster installation and effective load distribution across multiple bearing plates in diverse soil densities.

It is recommended to consult with a structural engineer to determine which system is most appropriate for your specific site conditions and local building codes.