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A floating foundation is a type of foundation constructed by excavating the soil in such a way that the weight of structure built on the soil is nearly equal to the total weight of the soil excavated from the ground including the weight water in the soil before the construction of structure

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A floating foundation follows buoyancy principle, such foundation are constructed by excavating the soil in such a way that the weight of structure built on the soil is nearly equal to the total weight of the soil excavated from the ground including the weight of water in the soil before the construction of structure. so that weight of structure is balanced by weight of soil removed.

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floating foundation. : a building support on soft soil that consists of a stiff reinforced concrete slab which distributes the concentrated loads by columns to the soil so that the pressure intensity on the soil is nowhere more than the acceptable amount.

Typically, raft foundations are formed by reinforced concrete slabs that cover a wide area, often the entire footprint of a building. They spread the load imposed by a number of columns or walls over a large area, and can be considered to 'float' on the ground as a raft floats on water

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In simple words when the foundation is not supported by rigid soil mass or rock below the earth surface and it rest completely over the soil similar in friction pile then the foundation is termed as Floating foundation

eg. Raft foundation

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For a floating raft foundation, or floating foundation, the foundation has a volume such that, were that volume filled with soil, it would be equal in weight to the total weight of the structure. When the soil is so soft that not even friction piles will support the building load, the final option is the use of a floating foundation, making the building like a boat that obeys Archimedes’ principle; it is buoyed up by the weight of the earth displaced in creating the foundation.