Building Construction
Gravels

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

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Building Construction
In a colar beam roof

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

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