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Underpinning is a type of curative work employed to eliminate ongoing movement in a structure. Generally underpinning is required when either the foundations of a building are poor or the subsoil on which the foundations are bearing has weakened, or a combination of both. As such the underpinning work may include either strengthening of the subsoil, generally done by pressure grouting, or by improving the foundations themselves with piles and ground beams, or a combination of both pressure grout