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Definition of underpinning
Short answer
Underpinning is the process of strengthening or deepening an existing building's foundation by extending it to a firmer stratum or enlarging its base to safely carry loads. It involves excavating below the old foundation in sections and constructing new concrete or masonry up to the old footing, transferring loads deeper.
Define underpinning.
Underpinning is the process of strengthening or deepening the foundation of an existing building by extending it to a firmer or deeper stratum, or enlarging the base, so that it can carry the load safely.
It is carried out by digging below the old foundation in short sections and building new concrete or masonry up to the base of the old footing, so that the load is shifted to a deeper or firmer stratum.
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