[RE-wrenches] 2018 Residential Code Fire Setbacks

[Blake Gleason]

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 at 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]
>
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