Does sprinkler protection beneath an open grated mezzanine change the ceiling level sprinkler design density?
e have a building with a storage room with a grated mezzanine at 8' AFF. Beneath the mezzanine is Class I-IV storage on shelves to the bottom of the mezzanine and on top of the mezzanine is similar storage to 10' high.
NFPA 13 requires sprinkler protection for open grating over 4' in width but there is no indication on if this affects the ceiling sprinkler design as it might for in-rack sprinklers.
My feeling is the system would have to be designed as if it was ~18' high storage with heads under the mezzanine that match that density, but I am not sure if this is correct or if there would be a benefit to covering the grating entirely and possibly considering it storage under 12' below and above.
Thanks in advance for your take.
Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
Subscribe and learn something new each day:
Top October '23 Contributors
Get 100 Days of Free Sample Questions right to you!
PE PREP SERIES