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Raft foundation is reinforced concrete slab that is supported on a compacted hardcore base that is bigger than the raft. The procedures in construction the foundation involves checking the soil properties, and making the edge of the raft stepped to make a toe so the outer leaf of the wall goes below ground. The slab is reinforced with steel, a radon barrier is added, and a damp proof course is put in.
If the soil is so lose that it cant hold the building even with pile foundation. So, piled raft foundation is used which make the building to float like a boat. That obeys Archimedes' principle-it is buoyed up by the weight of the earth displaced in creating the foundation.
Matt or Raft Foundation Combined Footings Pile Cap Foundations Isolated Foundations Continous Foundation
The perimeter beam around the edge of a raft foundation.
The main advantage of a raft foundation is that it is more economical. Another advantage is that it requires little excavation. The disadvantages of raft foundations are that there is a greater potential for erosion, and they require specific treatments to bear a load.
disvantages of a narrow strip foundation
It are a Afrikaans way of saying Raft Foundation.
Types of raft foundation are 1. Solid slab raft 2. Beam and slab raft 3. Cellular rafts
Its all about the type of soil and the building structure is going to build on it. If the site soil is not the type (i.e; like clay soil, the soil cannot having load bearing capacity etc.,) for constructing big buildings, its better to go for raft foundation. Because, this type of foundation spreads the load of building to overall area and if the foundations are constructing very near by each other means. In that time also, this foundation can be laid.
They r the same. There is no difference.
weight and length of steel bar ~6
The raft will help to avoid any settlement that would occur to strip the foundation. The mat is just placed there to avoid slipping.