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There are few options for helical piers. Per the engineering specifications, we installed square shaft pre-footing helical piers for this multi-unit apartment housing in Hazelwood, MO. Knowing the load calculated by an engineer that the footings need to hold in weight, square shaft helical will work as designed and installed. For existing structure, we prefer to use round shafted helical piers because their strength allows for deeper soil penetration and holding capacity for the structure.
Once the helical piers are installed then the re-bar steel footing reinforcement are “caged” around the flat pier caps and the concrete footing are poured. After that, the foundation walls are framed and poured and then the framing of the structure begins.