What Is Raft Slab?

Raft slabs consist of a thick steel reinforced slab that is integrated with steel reinforced beams, which are dug into the ground for added strength and support. … It’s also more suited to sloping blocks as the edge beams are dug into the ground and working the slab into the soil and slope.

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.

Where is raft slab used?

Raft foundation is generally used to support structures like residential or commercial buildings where soil condition is poor, storage tanks, silos, foundations for heavy industrial equipment etc.

What is the difference between raft slab and waffle slab?

When would you use a raft slab?