The 2021 IPC (Section 903) requires vents to terminate at the height specified by the AHJ (in fact the text of the document literally says "not less than [NUMBER] inches (mm) above the roof" which I believe in general is based on 6 inches above anticipated snow cover.
The 2021 IPC also specifically addresses things like PV modules over vents - when the vent is covered, like by a PV module, and thus cannot be covered by snow, the vent can terminate 2 inches above a sloped roof. There must be an "open area for the pipe to the outdoors" not less than the I.D. of the pipe, and there must be means to prevent birds/rodents from entering/blocking the pipe. Brian Mehalic NABCEP Certified Solar PV Installation Professional™ R031508-59 National Electrical Code® CMP-4 Member (520) 204-6639 Solar Energy International http://www.solarenergy.org SEI Professional Services http://www.seisolarpros.com On Fri, May 13, 2022 at 9:53 AM Bruce Leininger via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hello. I'm wondering if there is a code reference for the allowable > clearance above a plumbing vent. I've run into several jurisdictions that > ask for the clearance to be at least 2x the diameter of the vent pipe. I'm > wondering if there are any code references to back this up or any code that > specifically prohibits obstructions (like solar panels) above plumbing > vents. > > Thanks all! > > Bruce > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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