I have a warehouse with a roof 20 feet above. The designer has branch lines hanging under the ceiling joists. He has 10 foot drops of 1-1/2" sched 40 to an ACT ceiling over office spaces. We are in a "D" seismic design category building. I am unable to find any requirements for vertical restraint in the NFPA 13 or ASCE 7-10. Can anyone direct me?
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