What underpinning is intended to do
Depending on the system and conditions, underpinning can transfer structural loads to deeper or more reliable bearing material. Layout, depth, capacity, and installation requirements vary by project.
When it may be considered
Underpinning may be discussed when evaluation identifies foundation settlement or inadequate support. The design should reflect the actual building loads and site conditions rather than a one-size-fits-all number of piers.
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