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floating foundation[¦flōd·iŋ fau̇n′dā·shən]
A reinforced concrete slab that distributes the concentrated load from columns; used on soft soil.
A foundation mat several meters below the ground surface when it is combined with external walls.
A special type of foundation made to carry the weight of a superstructure which is to be erected on unstable soil. Such a foundation consists of a large raft-like slab composed of concrete and reinforced with steel rods.
A reinforced concrete slab used to support and distribute the concentrated load from columns in a soil having low bearing capacity; also called a raft foundation or mat foundation.