So according to 8.6.5.1.2 “the Beam Rule” [cid:[email protected]] You have 24” beams and if centered between the beams, you can be above the bottom of the beam by 12” for 3’-6” away. And according to 8.6.4.1.2 (3) below you can have your heads 12” below the deck so your right there..
Anthony Carrizosa Project Manager | Fire Protection 7855 S 206th St Kent, WA 98032 Cell: 206-679-5283 | Office Dir: 253-341-4593 [cid:[email protected]] https://archerconstruction.com<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2farcherconstruction.com%2f&c=E,1,Wdb65AWzMgSBzW3HDw91SfcRQCtxDUQKoJf-UowQ-WnB_WMosgG-8W7eLePJ42PwWQvLiQx16Pls052VqwHO7tKm-_u5AnWly0ewkNiMkxn-AjQb1JI,&typo=1> From: Anthony Carrizosa Sent: Friday, February 9, 2024 1:49 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: RE: Concrete Beams -- NFPA 13, 2016 Sounds like Obstructed construction 8.6.4.1.2 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 in-stalled in conformance with 8.6.5.1.2 (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 Anthony Carrizosa Project Manager | Fire Protection 7855 S 206th St Kent, WA 98032 Cell: 206-679-5283 | Office Dir: 253-341-4593 [cid:[email protected]] https://archerconstruction.com<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2farcherconstruction.com%2f&c=E,1,Wdb65AWzMgSBzW3HDw91SfcRQCtxDUQKoJf-UowQ-WnB_WMosgG-8W7eLePJ42PwWQvLiQx16Pls052VqwHO7tKm-_u5AnWly0ewkNiMkxn-AjQb1JI,&typo=1> From: Jackie Ward <[email protected]<mailto:[email protected]>> Sent: Friday, February 9, 2024 1:38 PM To: [email protected]<mailto:[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 [email protected]<mailto:[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 [cid:[email protected]][Firetrol Oklahoma City BACK][cid:[email protected]]
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