18" setback at the ridge, assuming <33%. Doesn't matter what's on the other side of the ridge.
For hips (not ridges), we are usually allowed to take advantage of the "other side" as long as there is a 36" path in total (eg, 6" on one side of the hip, and 30" on the other side). Blake On Wed, Jun 7, 2023, 12:02 PM rick--- via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Wrenches, > > Looking for some guidance on setbacks at ridge for PV systems. The 2018 > code states the following: > > R324.6.2 Setback at ridge. > > For photovoltaic arrays occupying not more than 33 percent of the plan > view total roof area, not less than an 18-inch (457 mm) clear setback is > required on both sides of a horizontal ridge. For photovoltaic arrays > occupying more than 33 percent of the plan view total roof area, not less > than a 36-inch (914 mm) clear setback is required on both sides of a > horizontal ridge. > > In reading this > <https://ipsunsolar.com/new-fire-code-setbacks-in-virginia-will-limit-the-size-of-solar-projects/>article > put out by Ipsun Solar regarding the setbacks, they state that if there’s > no PV on the opposite side of the roof no setback is required, although > their diagram shows a 12” setback. I don’t see any exceptions in the code > that indicate that. What’re you all doing for ridge setbacks? > > Thanks, > > > rick brown > SolShine Energy Alternatives, LLC > Electrical & Solar Contracting Services > www.SolShineEnergy.com > Roanoke, VA > Office: 540.235.3095 > Mobile: 540.808.9502 > > VA Class A Contractor Lic# 2705147660 > VA Master Electrician Lic# 2710062762 > VA Alternative Energy Systems Installer > NABCEP Certified PV Installation Professional 110112-21 > > [image: solshine-01-18-17 copy.jpg] > > _______________________________________________ > 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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