Brian, Hang from the vertical portion of the purlin only. It is unlikely you will find a purlin that is designed to support sprinkler pipe from the bottom. The best way to accomplish this it to install the hanger prior to the vapor barrier. Use angle bracket type attachment put the bottom of the angle bracket flush with the bottom of the purlin and use two screws so the hangers do not get out of square. You will be able to locate the bracket easily after the vapor barrier is installed because it is mounted flush with the bottom of the purlin.
Christopher S. Wilson Project Design Manager, SET [cid:treasure-valley-350-1.0_4621d75e-0876-470c-a582-8a1a743b106c.png] (208) 362-1888<tel:(208)%20362-1888> [email protected]<mailto:[email protected]> Treasure Valley Fire Protection 2731 Saturn Way Boise, ID 83709 www.tvfpinc.com<https://www.tvfpinc.com/> From: Ed Kramer <[email protected]> Sent: Wednesday, January 29, 2025 4:42 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: Hang From Bottom of Purlin You don't often get email from [email protected]<mailto:[email protected]>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> We've had a lot of projects recently where 'simple saver' plastic liner (or something similar) is installed to the bottom of the purlins. I still prefer attaching to the vertical part of the purlin, but that can get tricky, messy, and a bit ugly. We've used a lot of the sammy-type products (there are other brands on the market) to hang from the bottom horizontal flange of the purlins - in particular the products that 'mushroom out' as they're tightened. Yea, look at the listings carefully - there are limitations on size of pipe that can be hung, and minimum thickness of the purlin you're attaching to. Also check the PEMB drawings for any limitations they have for hanging. The maximum point loads can be pretty small. We're dealing with a couple projects now where we're installing multiple anchors for each hanger (kinda like a trapeze bar) to keep the PEMB people happy. You can get really creative if you're willing to get the PE stamp on it. Ed Kramer Bamford Fire From: Brian Harris <[email protected]<mailto:[email protected]>> Sent: Wednesday, January 29, 2025 2:55 PM To: [email protected]<mailto:[email protected]> Subject: [Sprinklerforum] Hang From Bottom of Purlin I've was always taught to hang from the vertical leg of a purlin. We have a case where there will be a barrier installed, and the bottom flange is the "only" place to hang. If I'm reading the data sheet for Sammy Sidewinders it looks like there are a couple options, 2" & 3" pipe. Thoughts? Thank you, Brian Harris, CET BVS Systems Inc. bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935 Disclaimer This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. PLEASE PRINT RESPONSIBLY.
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