Underpinning – Excavating, Supporting, and Rebuilding Weak Foundations
Underpinning is the process used to strengthen or stabilize a building’s foundation when it becomes weak or unstable. For a common homeowner in New York City, underpinning means carefully digging beneath the existing foundation in small sections and placing new, stronger material (usually concrete) under and around the old foundation footings. This supports the building and prevents it from settling unevenly or shifting, which could cause cracks or structural damage. Underpinning is often needed if the original foundation isn’t strong enough, soil conditions have changed, extra floors are added, or nearby construction affects your home’s foundation. The work is done in stages to keep the building safe during the process, and it must meet NYC building codes and inspection standards for safety and durability.
- foundation
- settling
- stabilization
- soil
- concrete
- inspection
See how underpinning looks in practice in this Instagram photo series
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