I can't use dropbox on my computer, so unfortunately I cannot learn my lesson!

Correctly installed leadwork should be treated with patination oil (and maintained) to prevent (reduce) the lead oxide runoff, but this only partially works over glass. This is espescially important above PV panels whose glass includes special treatments for low reflection and anti-soiling and are highly 'attracive' to lead oxides.

When I installed PV in a roof integrated system with a leadwork flashing on top of the panels (UniSolar Shingles, C21, or Solar slates back then), I always covered the panels with a peel and stick plastic cover for a few weeks after patination.

This plastic wasn't removed until the leadwork had seen a few rainy days, as the patination oil would also streak until it had weathered. This would at least stave off issues for a while, as once the patination oil sets it allows the rain to slip off and reduces oxidation of the lead surface.

Patination only works for a year or two, without reapplication the panels were eventually etched with lead streaks

Wherever possible we specified 'fake lead' flashing, but some customers would not listen to advice... We had to ask for signed disclaimers as the lead streaking also voided the manufacturer warranty and in extreme cases could lead to cell burnout after a few years.


I still see modern roof integrated PV slates flashed in lead, and wonder what if any precautions they take now.

Thanks Tony, but the issue is with our IT security system at work rather than dropbox etc.

We are not allowed to access any download/upload sites :-(

Thx