Building Construction
In a colar beam roof

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

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Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
All listed here
Hinders the ground water observations and permeability test

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