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Slope Factor for Roofs With Solar Panels

Slope Factor for Roofs With Solar Panels

Slope Factor for Roofs With Solar Panels

(OP)
When designing a new truss for a roof that will have solar panels on one side do you consider the roof as non-slippery on the solar panel side? (i.e. should the slope factor = 1 for lower sloped roofs?)  The panels being proposed have a 3/8" high, rounded seal between the panels.  I found an interesting article on slippery roofs at the following site:

https://www.nrc-cnrc.gc.ca/eng/ibp/irc/cbd/building-digest-228.html
 

RE: Slope Factor for Roofs With Solar Panels

I would think that the solar panels would act like a shear key against the sliding of the snow.  

What's with the entry below the link?

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Slope Factor for Roofs With Solar Panels

Unless your building has a design problem using the non-slippery roof I would use the non-slippery factors, just in case they remove the solar panels in the future.

Garth Dreger PE
AZ Phoenix area

RE: Slope Factor for Roofs With Solar Panels

Two things to look into:

1. Snow accumulation behind the panel.
2. How fast the snow on panel will melt, any chance for snow accumulation on the panel.

I will take the worst case.

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