Building Construction
Raft foundations are used for:

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

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Building Construction
In a colar beam roof

There is no horizontal tie beam
There is a horizontal tie at the feet of rafters only
There is a horizontal tie at almost the middle of rafters only
There are two horizontal ties, one at the feet and other at the middle of the rafters

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