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The advantages are that many workers know how to use it and it is cheap. Disadvantages are that it is really difficult to fix up any mistakes.
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.
A stepped foundation is a type of foundation made from "cement", it is used when building on a hillside so that the building can be built up level off the foundations
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