Underpinning is a broad term for adding or improving support beneath an existing foundation. It may be considered when the existing support is not adequate for the condition being addressed.
Not every crack needs underpinning
Underpinning is a structural intervention, not a default response to any visible crack. The cause, load path, soil/support conditions and extent of movement should be evaluated first.
See foundation settlement and foundation stabilization.
Concerned about your foundation?
Call Edison Foundation Repair Pros to discuss the signs you are seeing and the next appropriate step.
Call 732-479-2336