If it qualifies as Obstructed Construction by definition:
*10.2.6.1.2 Obstructed Construction.* Under obstructed construction, the sprinkler deflector shall be located in accordance with one of the following arrangements: - (1) Installed with the deflectors within the horizontal planes of 1 in. to 6 in. (25 mm to 150 mm) below the structural members and a maximum distance of 22 in. (550 mm) below the ceiling/roof deck - (2) Installed with the deflectors at or above the bottom of the structural member to a maximum of 22 in. (550 mm) below the ceiling/roof deck where the sprinkler is installed in conformance with *10.2.7.2* <https://link.nfpa.org/publications/13/2022/chapters/10#ID000130001317> - (3) Installed in each bay of obstructed construction, with the deflectors located a minimum of 1 in. (25 mm) and a maximum of 12 in. (300 mm) below the ceiling - (4) Installed with the deflectors within the horizontal planes 1 in. to 6 in. (25 mm to 150 mm) below composite wood joists to a maximum distance of 22 in. (550 mm) below the ceiling/roof deck only where joist channels are fire-stopped to the full depth of the joists with material equivalent to the web construction so that individual channel areas do not exceed 300 ft2 (28 m2) But I’m guessing your situation doesn’t meet that definition…. *Bob Caputo, CFPS* *President* *American Fire Sprinkler Association* c: 760-908-7753 p: 214-349-5965 ext124 w: firesprinkler.org <https://www.facebook.com/firesprinkler.org/> <https://twitter.com/afsa/status/1039528345367732224> <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> <https://www.instagram.com/firesprinklerorg/> *Our new address is 1410 East Renner Rd., Suite 150, Richardson, TX 75082* *Need a Refresher on Hand Calculations?* During AFSA’s three-day in-person Sprinkler Hydraulic Calculations Workshop, learn and apply principles of hydraulics, including the different types of pressure, calculating changes in pressure (elevation and friction loss), and node analysis. Click here <https://www.firesprinkler.org/calendarevent/sprinkler-hydraulic-calculations-workshop-4/> for details and to register. *From:* Taylor Schumacher <tay...@sfsprinkler.com> *Sent:* Tuesday, May 23, 2023 1:05 PM *To:* 'sprinklerforum@lists.firesprinkler.org' < sprinklerforum@lists.firesprinkler.org> *Subject:* [Sprinklerforum] Sidewalls for 18 Inches Down Does anyone know of a sprinkler that meets the allowance for up 18 inches below a ceiling? I have an architect that’s quoting that section, but I’ve never seen that unicorn… *8.7.4.1.1.2 * Horizontal sidewall sprinklers shall be permitted to be located in a zone 6 in. to 12 in. (150 mm to 300 mm) or 12 in. to 18 in. (300 mm to 450 mm) below noncombustible and limited-combustible ceilings where listed for such use. *Taylor Schumacher* Security Fire Sprinkler <http://www.j-berd.com/> 1 Industrial Blvd | Sauk Rapids, MN 56379 Office: 320.656.0847 | Direct: 320.640.7050
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