Looking for some help on inspecting threaded rod. When is a threaded rod stiffener required? I inspect sprinkler, water piping & HVAC duct. I offten see the threaded rod size increase but never rod stiffeners added. Is there a rod size when a stiffeners are not required? Example- I may see sprinkler piping supported 8' from the structure with a 1/2" threaded rod or duct with 3/8" threaded rod 10'. I have read every code I can get my hands on and can't seem to find a maximum lenght for a threaded rod or when stiffeners are required. I am located in a Seismic C area and have searched for some answers in ASCE 7-05 but haven't really came across an answer. Would appreciate any help.
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