How are the sprinklers supplied in the Ordinary Hazard compartments below? In earlier editions of NFPA 13, you cannot run CPVC piping to Ordinary Hazard sprinklers covering areas greater than 400 ft². (For 2019 there is an allowance for up to 1000 ft² in private residential parking garages.) Even though the attic area is Light Hazard, it would be considered an Ordinary Hazard sprinkler system if you were protecting both up-and-down with that piping complement. If you have an Ordinary Hazard piping complement and the pipe that you are describing is separate and apart from that, serving only the Light Hazard above, then you could make a case for it, I think.
If your goal is to run plastic up the walls to the Light Hazard sidewalls, then do that but connect those risers to a conventional OH system in the 1st floor interstitial spaces. Steve Leyton (Sent from my phone; please excuse typos and voice text corruptions.) -------- Original message -------- From: "[email protected]" <[email protected]> Date: 12/12/18 9:59 PM (GMT-08:00) To: [email protected] Subject: Re: CPVC pipe passing thru ordinary interstitial space I missed to explain this part…. Thanks Steve. The concealed space will be sprinklered and yes I am proposing to install the sprinklers in the concealed space of the CPVC piping an as per the listing for CPVC pipe (i.e. piping max 6” above ceiling or insulation etc.) I’m also pointing to NFPA 13 [2013] section 8.15.1.3 “Concealed Space Design Requirements. Sprinklers in concealed spaces having no access for storage or other use shall be installed in accordance with the requirements for light hazard occupancy.” On Thu, Dec 13, 2018 at 12:32 AM Steve Leyton <[email protected]<mailto:[email protected]>> wrote: Is the interstitial space combustible? If so, are you proposing to sprinkler the space with sprinklers that satisfy the listing limitations of the CPVC? Does the CPVC also supply the OH space below? [Steve Signature (3)] From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of [email protected]<mailto:[email protected]> Sent: Wednesday, December 12, 2018 9:29 PM To: [email protected]<mailto:[email protected]> Subject: CPVC pipe passing thru ordinary interstitial space I have a job that’s a 2 story building with an A truss roof, 1st floor is retail and 2nd floor is residential, the entire building is being sprinklered as per NFPA 13. We want to install sidewalls with multiple CPVC risers and tie everything in 1st floor interstitial space, Question is if there are any limitations of using CPVC pipe in the interstitial above an OHII occupancy.? My initial taught is that since its protecting a light hazard occupancy it should be ok also the pipe is not exposed to the OHII (floor truss is being covered with 1 HR. rated assembly) Does it matter that CPVC passes thru the ordinary space? _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org -- Regards, Joel Chaim Active Fire Protection Inc. Phone: 845-782-7494 Cell: 845-781-3075 Fax: 866-903-9949
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