685. Stability of structures; demolition or dismantling in regard to construction.

685.     Stability of structures; demolition or dismantling in regard to construction.

All practicable1 steps must be taken, where necessary to prevent danger to any person, to ensure that any new or existing structure2 does not collapse if, due to the carrying out of construction work3, it may become unstable or in a temporary state of weakness or instability4.

Any buttress, temporary support or temporary structure must be of such design and installed and maintained so as to withstand any foreseeable loads which may be imposed on it, and must only be used for