Building Construction
To ensure that supporting area of an offset footing of a boundary wall is fully compressive, the C.G. of load must act

Within the middle fifth of the base
At the centre of the base
Within the middle third of the base
Neither (A), (B) nor (C)

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Building Construction
Raft foundations are used for:

Counter acting the hydrostatic effect
All listed here
Spanning over small soft or loose pockets
Providing increased area of foundation over poor bearing capacity of soil

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