The process of strengthening and stabilizing the foundation of an existing building or structure. Underpinning may be necessary for a variety of reasons: 1) The original foundation is simply not strong or stable enough, 2) The usage of the structure has changed or, 3) The properties of the soil supporting the foundation may have changed.The process of strengthening and stabilizing the foundation of an existing building or structure. Underpinning may be necessary for a variety of reasons: 1) The original foundation is simply not strong or stable enough, 2) The usage of the structure has changed or, 3) The properties of the soil supporting the foundation may have changed.

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