A foundation pier is a vertical support element, typically concrete or steel, that transfers a portion of a building’s load down to soil or bedrock capable of bearing it, either as part of original construction or as a later repair. In repair contexts, piers are installed beneath an existing foundation to stabilize areas that have settled or shifted.
The choice of pier type for a repair, whether helical, driven, or concrete, generally depends on soil conditions, access constraints, and how much lift the affected area actually needs.
What Does a Foundation Pier Involve?
- A vertical concrete or steel support element
- A footing or bearing point at its base
- A bracket or connection to the structure above
- Installation equipment suited to the site conditions
Why Are Foundation Piers Important?
When a section of foundation settles unevenly, often due to soil that has dried, shifted, or eroded beneath it, installing foundation piers at that location can lift or stabilize the affected area by transferring its load to more reliable soil or bedrock deeper down. This makes piers one of the most common foundation repair methods, particularly for houses on expansive clay soils where seasonal moisture changes cause repeated movement.
A structural engineer typically determines both the number and spacing of piers needed for a repair, since installing too few in the wrong locations can leave the underlying settlement problem only partially addressed. Post-repair monitoring, often using simple elevation measurements taken periodically after installation, helps confirm that the piers have successfully stabilized the affected area and that no further movement is occurring.
Foundation Pier vs. Helical Pile
A helical pile is one specific type of foundation pier, installed by twisting it into the ground with a helical bearing plate. Foundation pier is the broader term covering multiple installation methods, including helical, driven, and concrete pier systems.