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Re: Wind load design for Photovoltaic panel installations

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Not sure either, since a screw or lag at each corner is likely more than enough to stop this thing from uplifting off the main roof. (I'd be more concern about the contractor actually hitting the rafter dead center so as not to split it with the lag). Even at 50 psf, for a 4x4 panel, that's only 200 lbs at each corner uplift.


On Fri, Aug 15, 2008 at 11:32 AM, sscholl2(--nospam--at) <sscholl2(--nospam--at)> wrote:

I have entered this late but wish to learn what the problem is.

It seems to me that photovoltaic panels (which I believe weigh about 3 lbs/sq. ft.) will prohibit anyone walking on the roof (for which we design for 16psf on a 4/12 slope) and thus the load is less not more than typical design load.  Is this what is of concern?

Stan Scholl, P.E.

(someone with a very low  PE number)

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