I am designing a sprinkler system for an underground parking garage (Ordinary Hazard, Group I) with NFPA 13 (2013 Edition). The concrete ceiling has slab bands that drop 12-inches (300mm) down from the underside of the ceiling.
I am using extended coverage uprights on a dry system.
Can I use Section 188.8.131.52.2 (1) to show sprinklers 1- to 6-inches below the slab band, which would make them 13- to 18-inches below the underside of the ceiling?
This would make them less than 22-inches below the ceiling.
I'm asking because I don't know if a slab band counts as a "structural member" as far as this is concerned.
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