What is raft or mat foundation? A raft or mat foundation is a large continuous rectangular or circular concrete slab that carries the entire load of the superstructure and spreads it over the whole area beneath the building. It is considered as one type of shallow foundation and is useful in controlling the differential settlement.
Is mat foundation and raft foundation the same? A raft foundation, also called a mat foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground.
What is the raft foundation? A raft foundation is a reinforced concrete slab under the whole of a building or extension, ‘floating’ on the ground as a raft floats on water. This type of foundation spreads the load of the building over a larger area than other foundations, lowering the pressure on the ground.
What are the types of mat foundation? Common types of mat foundations, (a) Flat plate; (b) Plate thickened under columns; (c) Waffle slab; (d) ribbed raft; (e) Basement walls as part of mat.