What is Underpinning Foundation By lowering the footing to sit on more supporting soil, underpinning foundation is a procedure used to strengthen, repair, or extend the depth of an existing foundation. Underpinning is frequently used to repair weak or failing foundations, but it is also employed when a building's purpose has changed, floors are being added to the higher stories, or extra depth is needed in subsurface areas like cellars or basements.
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