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 the feet of rafters only
There is a horizontal tie at almost the middle of rafters only
There is no horizontal tie beam

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Building Construction
Gravels

Never swell when they come into contact with water
All listed here
Vary in size between 2 to 20 mm
Are cohesionless aggregates

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