Raft foundation

What is foundation?

• Element of a structure

• Support the loads

• Support dead and live loads

• Support the soil

Types of raft foundations

• Flat raft/ thicken slab

• Wide beam/ Wide toe raft

• Beam and slab raft

• Cellular raft

• Strip foundation

Flat raft/thicken slab used for

• Houses

• Educational building

• Shopping complexes

• Skyscrapers building

Flat raft/ thicken slab is economically suitable up to a thickness of

• 300mm thick

• More than 300mm thick

• More than 500mm thick

What is the function of wide beam slab/wide toe raft?

• Support the outer skin of brickwork

• Support inner skin of brickwork

• Support strip foundation

Beam and slab raft suitable for

• Poor soils

• High bearing capacity soils

• Palm oil plantation soils