Concrete underpinning is a method of using concrete to support a foundation. This method is used sparingly and in special applications where deeper soil strength parameters are not a concern. A section of the foundation is undermined and concrete is poured in place.
Advantages:
- Generally less expensive than steel piering
- Relatively easy to install.
Disadvantages:
- Unscientific
- Sometimes will cause structure to settle again because of the extra weight added to the footing ( if not out of the active soil zone). This concrete then has to be removed before piers can be installed
- Without proper soil testing lifetime stability of the structure is questionable.
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