Building Construction
The depth of concrete bed of the foundation depends upon

The mix of the concrete
All listed here
The projection of the concrete block beyond the footing over it
The upward soil pressure

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Building Construction
In a colar beam roof

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

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