Ceiling Pocket borders entire room.
Ceiling Pocket borders entire room.
(OP)
Good day!
I need some help. I'm finishing up the final design of a new BMW Dealership in Las Vegas and the main show room area has and enclosed room (28'X120').
The room has a "reverse soffit" border against all walls. The lower ceiling is at 15'-0'. The high ceiling elevation in the bordering pocket is 18'-0". The width of the pocket on the 28'-0" walls is 3'-0". The pocket along the longer walls is 2'-6". NFPA #13 2013 edition addresses ceiling pockets and skylights, but not surrounding pockets as described above. It doesn't see logical that these pockets should be protected. The entire floor area is protected used 11.2k Tyco E.C. at 16X16 spacing.
Anyone out there have a similar situation or information for me?
Thanks!
Jeremy in Vegas.
I need some help. I'm finishing up the final design of a new BMW Dealership in Las Vegas and the main show room area has and enclosed room (28'X120').
The room has a "reverse soffit" border against all walls. The lower ceiling is at 15'-0'. The high ceiling elevation in the bordering pocket is 18'-0". The width of the pocket on the 28'-0" walls is 3'-0". The pocket along the longer walls is 2'-6". NFPA #13 2013 edition addresses ceiling pockets and skylights, but not surrounding pockets as described above. It doesn't see logical that these pockets should be protected. The entire floor area is protected used 11.2k Tyco E.C. at 16X16 spacing.
Anyone out there have a similar situation or information for me?
Thanks!
Jeremy in Vegas.





RE: Ceiling Pocket borders entire room.
If that is the case, then it should look like this, except at the edges:
If that is true, then I would definitely consider that a ceiling pocket, a fire could start beneath it and heat could accumulate in the very large pocket (if it's continuous all the way around the room), preventing the lower sprinklers from activating in time. If that is the case, then I'd put sprinklers there per 13.
RE: Ceiling Pocket borders entire room.
My first thought was to put 4.2k sprinklers in there to cut down on the discharge. But, being a showroom, you are basically a parking garage and that is OH1. Small orifice sprinklers are not allowed in OH1.
I am assuming these will be on the end of a line. Just put the 5.6k in a minimum pressure and keep the pipe size large enough to those that you don't burn more than 0.2 psi total if possible. Then, you won't over-discharge your Ex Cov sprinklers at the main ceiling.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
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RE: Ceiling Pocket borders entire room.
If you could convince the GC/Arch to put (2), 8" wide bulk head x 36" deep, in the center of the pockets, spaced at least 10' apart you could provide the coverage with (2) sprinklers between the bulk heads. These bulkheads would separate the pockets by the minimum of 10', with a protected pocket. If you can't get the GC/Arch to sign on with a way to split the pocket up you are more than likely stuck with protecting the entire pocket as it is over 1000CuFt in volume.
Hopefully this will generate some ideas on separation of pockets, so the entire pocket does not need to be protected. Just make sure that pocket does get over 3ft deep.
RE: Ceiling Pocket borders entire room.