I have a strange situation: a concrete deck with surface-mounted light fixtures.
We then have a ceiling grid that is suspended about a foot below that, where they have 2-ft x 4-ft plastic grid fixtures below the lights to allow light to shine through. The openings are in the middle of the room so it's not a "cloud ceiling", and they represent more than 20% of total ceiling space. Do I simply provide coverage below grid as normal and above the ceiling grid 24-ft in every direction above the openings in accordance with NFPA 13 2016 8.15.23.3.1? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments
Pete H
8/22/2022 07:29:29 am
Sounds like it. I'd say yes.
Reply
Glenn Berger
8/22/2022 08:18:13 am
The more than 20% of ceiling space is the kicker. Need more information of the occupancy and construction of the space to advise.
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Matt Laughlin
8/22/2022 04:49:31 pm
Office space, light hazard w/ brick walls and concrete deck where the lights in question are. A few ord haz storage spaces but no grid in those.
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Dan Wilder
8/22/2022 08:22:54 am
I guess it's a Monday and I'm not picturing this correctly.
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Matt Laughlin
8/22/2022 04:52:06 pm
Not a bad idea. It's existing construction but the grid's at least partially coming down so we can install. I'll look into that, thx.
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Todd E Wyatt
8/22/2022 08:34:24 am
2022 NFPA 13 defines a "cloud ceiling" as ...
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Matt Laughlin
8/22/2022 04:54:59 pm
I don't think cloud applies because the ceiling grid isn't open on at least two sides; it's tight to wall on all four. I think I have to treat the grid as one big obstruction.
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Jesse
8/22/2022 09:29:32 am
Admittedly I'm having trouble picturing this. I think, by what you're describing, you'll need to protect above and below.
Reply
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