When to Choose Raft Foundation
For foundation design, one of the most important aspects is choosing the right type of foundation. Raft foundation is preferred when-

The soil has a low bearing capacity.
Load of the structure has to be distributed over a large area.
Individual or any other foundation area would approximately cover 50% of the total ground area beneath the structure.
The columns or walls are placed so closely that the individual footings would overlap.
Stress on soil needs to be reduced.
There is a possibility of differential settlement in case individual footing is used.
When soil strata are unpredictable and contain pockets of compressible soil.
Basement is to be constructed.
Any other type of footing cannot be used advantageously.

Nice post sir!
Is basement really a factor for raft consideration?

Yes, raft is the foundation of all basement. Basement simply called underground by laymen

Clemostica:
Yes, raft is the foundation of all basement. Basement simply called underground by laymen

@bold Not true sir...I have done basement using pad foundation.
& What type of raft do u use for basement?

Pad is for shallow basement, am talking of basement that carries other suspended slab before ground level

A basement or cellar is one or more floors of a building that are either completely or partially below the ground floor.

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