[RE-wrenches] copper roof

[Nik Ponzio, Building Energy]

Dear Wrenches,

We installed a PV system on a copper roof several years ago. We used brass
S5!-U clamps on standing seam and aluminum racking. We are now noticing
some discoloration at the drip-line below the modules. See photos here:
https://picasaweb.google.com/109634809794570027207/CopperRoof?authuser=0&authkey=Gv1sRgCMv8n6rCl8e8Sw&feat=directlink

There is also a fair amount of discoloration from bird droppings but that
doesn't seem to be the cause of the spots under the modules.

Does any know what's happening here, whether to be concerned about
corrosion, and how to prevent this in the future?



--
Nicholas Ponzio
Building Energy
1570 South Brownell Road
Williston, VT 05495
802-859-3384 ext.15 (office)
802-318-4783 (cell)
http://www.BuildingEnergyVT.com
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