Raft foundation is also known as mat foundation.
Mat foundation construction process.
To begin constructing the solid slab raft foundation the vegetative top soil original soil is removed then the soil left behind is compressed.
At those places we use mat foundations to distributes the whole loads of the structure to the soil when the area of the footing was increase than the soil load bearing capacity will also increase because this foundation reduces the stress on the soil at the same place.
Commonly used type of raft is the solid slab raft without downstand beam.
Raft or mat foundations 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.
Definition of raft foundation along with working principle when to choose raft types of raft foundation materials of raft foundation raft construction steps etc are discussed below.
A mat foundation is used when the subsoil is weak and column loads are so heavy that the conventional spread footings cover more than 50 of the building area.
Raft mat foundation is used in those places where we have less bearing capacity of the soil.