Good morning all,
We have a situation where there are multiple sections of ceilings that start
off flat/level for several feet and then curve upwards with a pitch that will
exceed 2:12 at some point in the curve. This situation occurs in a repeating
pattern over a large section of floor area. At the top of the curve there is a
small slot that serves as a return air opening. The design intent was to use
concealed, quick response, ordinary hazard, extended coverage sprinklers
located in the flat part of the ceiling. The question is "this a flat
ceiling?". Does the portion of the ceiling that exceeds 2:12 nullify the use of
the flat ceiling design?
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