Since sidewall sprinklers must be installed below smooth, flat ceilings, when I am confronted by beams installed perpendicular to the wall in which sidewall sprinklers are installed, I always install sidewalls below the smooth flat ceiling of each beam pocket.
My challenger suggests that if the "Obstruction Along Wall" rules of NFPA 13 Figs. 10.3.6.1.4 (2019 ed.) / 220.127.116.11.4 (2016 ed.) for standard spray sidewalls is met* then you can "skip" a beam pocket if the overall spacing and coverage is met.
Can you skip a beam pocket with a sidewall?
My opinion is that these are not intended for continuous obstructions such as beams, which adversely affect heat collection.
Y'all on my side?
*or the relevant figures for extended coverage sidewalls, or via the MeyerFire Sprinkler Obstruction Tool are met
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3/3/2023 06:45:42 am
I think this falls the "smooth flat celling" test from the get go. The rules of 18.104.22.168.4 deal with single non regular obstructions. like a duct running through the area.
3/3/2023 08:10:15 am
On the face of it, I think so. But I'm curious as to how deep beam pockets are.
3/3/2023 08:12:41 am
Dimensions are needed to evaluate and advise.
3/3/2023 10:39:11 am
Thank you, in the example being presented, the beams are W16's, ranging from 7'-6" to 8'-0" spacing. The designer placed the sprinklers intending to comply with the sidewall obstruction table in hopes to have sprinklers in ever other pocket, spraying EC sidewalls "under" the beams flanking each unprotected pocket. I believe this in not correct, but frankly (Franckly?) I could not come up with a solid argument that the obstruction table cannot apply.
3/3/2023 12:42:42 pm
If they're considering EC sidewalls to spray under the beams, Table 22.214.171.124.4 (2016) does not apply. EC sidewalls are governed by Table 126.96.36.199.4 (2016)
3/3/2023 08:40:23 am
Based on the restrictions for obstructions when using sidewall sprinklers, I would be very interested what the dimensioning is for the beam pockets that would allow skipping.
3/3/2023 11:05:25 am
Dan, it is T&G wood decking on 16" deep wide-flange beams, beams are at 7'-6" to 8'-0" spacing.
3/3/2023 12:41:42 pm
If the obstruction comes from the same wall as the sidewall sprinkler (which it seems to as this did claim they were perpendicular), as long as you meet the spacing requirements of Table 188.8.131.52.4 (2016), you're protecting the floor past the beam.
3/3/2023 02:28:57 pm
See application of sprinkler types.
3/6/2023 01:37:01 pm
3/14/2023 09:58:59 am
I have a situation where it is 2'-9" deep for ceiling pocket in which the surface itself can be considered smooth ceiling. The dimensions are 13'-6" x 13'-6" and it is a light hazard, can we use a sidewall for every ceiling pocket installed 6" or per manufacturer deflector distance?
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