Advantages and Disadvantages of Raft Foundation

The raft foundation or mat foundation is a very popular type of foundation. Before selecting raft foundation for a project, its advantages and disadvantages must be considered.

Advantages of Raft Foundation

Followings are the advantages of raft foundation:

• Mat foundation can be provided where the shallow foundation is necessary but soil condition is poor.
• It resists differential settlement. • Mat foundation requires less earth excavation.
• Mat foundation itself can be considered as a floor slab. So it reduces the cost of constructing floor slab.
• Distribute loads over a larger area. 

Disadvantages of Raft Foundation

Followings are the disadvantages of raft foundation:

• Prone to edge erosion.
• Special measurements are needed when mat foundation is subjected to the concentrated load.

The above limitations of mat foundation can be avoided by taking necessary steps.

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