Transmits load of the building to the subsoil beneath. Flat raft Cast on a bed of blinding concrete and a moisture proof membrane to prevent damp from rising through the slab. Wide toed raft Has a stiffening edge beam which acts as a toe to support the outer edge of brickwork. Strengthened with a reinforced concrete edge beam under the external and load bearing internal walls. Cast or driven into the ground.
Transfers loads from poor bearing soil to a more stable stratum.