Reinforcing the foundation of an existing building from below — used to fix settling foundations or allow digging nearby.
The process of strengthening or deepening the foundation of an existing structure, typically to increase bearing capacity, address settlement, or allow excavation adjacent to the structure. Methods include mass concrete underpinning (sequential bays), helical piers, push piers, and jet grouting. Underpinning is used when adding stories, correcting settlement, or excavating near existing buildings.
The adjacent brownstone required underpinning with helical piers before the new basement excavation could proceed within 10 feet of its foundation.
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