Jackie,
For a quick answer --- Concrete tees are a specific type of construction. They are generally fabricated off-site and shipped in and set in place. They will look like the snapshot below. If the concrete beams on your project aren’t like this and are poured in-place on the job site, you will need sprinklers in each bay unless you can meet the beam blocking rule. Cliff Whitfield, SET President Fire Design, Inc. 940 Summerbrooke Dr Tallahassee, FL 32312 Ph: 828-284-4772 From: Jackie Ward <[email protected]> Sent: Friday, February 9, 2024 4:38 PM To: [email protected] Subject: [Sprinklerforum] Concrete Beams -- NFPA 13, 2016 I have 18” wide concrete beams extending 24” from the bottom of the deck on 7’-0” centers. NFPA-13 (2016) 8.6.4.1.2 Obstructed Construction (5)* Installed with deflectors of sprinklers under concrete tee construction with stems spaced less than 71⁄2 ft (2.3 m) on centers, regardless of the depth of the tee, located at or above a horizontal plane 1 in. (25 mm) below the bottom of the stems of the tees and complying with Table 8.6.5.1.2. A.8.6.4.1.2(5) For concrete joists spaced less than 3 ft (900 mm) on center, the rules for obstructed construction shown in 8.6.4.1.2 apply. For concrete tee construction with stems spaced less than 7 ft 6 in. (2.3 m) on center, the sprinkler deflector can be located at or above a horizontal plane 1 in. (25 mm) below the bottom of the stems of the tees. This includes sprinklers located between the stems. [See Figure A.8.6.4.1.2(5).] I am getting caught up in semantics with the wording. Would a concrete beam be interpreted the same as a concrete tee? Am I allowed to install the deflectors above one-inch below the bottom of the beam in accordance with Table 8.6.5.1.2 as I would be if they were concrete tees, or will pocket protection be required? Sincerely; Jackie "JW" Ward; SET 1-405-240-7076 <mailto:[email protected]> [email protected] NICET IV Cert. No. 104187 Victaulic Vortex Integrator Firetrol Protection Systems 108 NW 132nd Street; Oklahoma City, OK 73114 405-752-2330 Ext. 10230 Fax:405-752-2297 License No: AR-FSS-162, LA-F415, OK-863 & 302, TX - ECR-1751432, ACR-1751168, SCR-G-0292 -- This email has been checked for viruses by Avast antivirus software. www.avast.com
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