A raft (mat) foundation is used primarily when:
Choose the correct answer
The soil bearing capacity is very high
Individual footings would cover more than about 50% of the plan area, or when soil bearing capacity is low
The column loads are very light
Depth of foundation is less than 1 m
Correct Answer
B. Individual footings would cover more than about 50% of the plan area, or when soil bearing capacity is low
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A raft foundation is chosen when the area of individual footings would exceed 50% of the total structure footprint (indicating poor soil bearing capacity), or when uniform settlement distribution is required over a large area.
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