Raft foundation is otherwise called mat foundation. Mat foundation is utilized, when load bearing limit of soil (SBC) is exceptionally low and segments are firmly dispersed with one another. It is additionally utilized instead of pile foundation, where it diminishes the expense and spare the season of development. Raft foundations are basically vast arrangement region establishments assembled either solidly or in cell structure. They might be utilized for delicately stacked structures on delicate regular ground or on other ground where powerless zones exist. For this situation the raft is intended to range crosswise over such zones with decent bearing pressures and satisfactory settlements.