Square vs. Round Helical Piers: Why it Matters

Helical piers are one of the options used to permanently stabilize settling foundations. They are named for their unique helix-shaped blades welded to the shaft that allow it to be mechanically screwed into the soil. These piers can be installed on the interior or exterior of the home, providing an opportunity to lift the home back to its original position.

Supportworks helical piers use round steel tubing. Don't be deceived if you see a similar-looking product made of square bar! Square bar helicals are cheap and plentiful in supply, but they were designed to hold wires in the ground for cell towers & light poles, not to support the foundation of your home. What difference does it make?

A socket and pin connection are used in square shaft helical piers. The couplers were designed to be pulled tight (in tension), not to support the weight of a house (in compression). They kink and bend when compressed, substantially diminishing their strength.

The steel area for a portion of the round shaft is positioned outward from the center of the shaft, providing greater bending resistance. Round shafts usually have a higher installation torque rating, meaning more force can be applied while the product is being installed. Higher installation torque generally correlates to higher pier capacities. With this in mind, the long-term load-bearing ability of square shaft helical piers pales in comparison to the strength & resilience of round shaft helical piers, where not only can permanent stability be guaranteed, but there is also great potential for lift that results in a level foundation.

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