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We have a Type II-B construction mostly light-hazard building with drop ceilings throughout. The plenum is not sprinkler protected. Walls go to either the ceiling or roof deck, depending upon the use of the space (ie: conference rooms have full-height walls for acoustics).
There is a closet which does not have a ceiling, and its' walls do not go to deck. Does this opening invalidate the elimination of sprinklers in the plenum from NFPA 13 (2013/2016) Section 8.15.1.2.2 for non-combustible and limited-combustible spaces? Would posting signage saying no combustible storage is permitted in lieu of extending the walls work instead of installing a ceiling? Sent in anonymously for discussion. Discuss This | Submit Your Question | Subscribe
7 Comments
Dan Wilder
3/5/2021 07:26:16 am
We had this issue on a recent project where the GC decided to eliminate ceilings in all janitor's closets. We provided a change order to add upright protection at the deck. We even got the AHJ to buy into utilizing 8.15.23.3 and provided protection out to 24' minimum from the edge all the way around the wall boundaries to lessen the overall impact.
David Kulbacki
3/5/2021 12:59:20 pm
I have seen this in my jurisdiction as well, and considered allowing 8.15.23.3, but this only applies when the above ceiling is open to the space below only on "one" side. We required walls to extend to deck or a drop ceiling.
Casey Milhorn
3/5/2021 09:10:02 am
I agree with Dan. This is a case where we really fight to have ceilings added. Typically cheaper than adding uprights.
Glenn Berger
3/5/2021 09:13:26 am
Get the walls installed to the structure, which will eliminate the issues and in the future.
CJ Bonczyk
3/5/2021 10:08:05 am
Add a ceiling if possible that can be grid or gyp to maintain a rating within the small closet(s)...cheaper than providing additional sprinkler protection extension above IMO.
Jesse
3/5/2021 01:09:07 pm
By far your cheapest option will be walls to deck with a single upright or a ceiling with a pendent. Otherwise Dan's solution above is your other option..
Rob
12/20/2023 07:40:14 pm
the first sentence says, "The plenum is not sprinkler protected." If it were protected would it require a ceiling? Leave a Reply. |
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