Sat, 27 Jun 2026 21:22:59 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310634#Comment_310634 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310634#Comment_310634 Wed, 13 May 2026 05:43:49 +0100 tony
See this picture : - (also further down the thread)

https://share.icloud.com/photos/066qjqEKhBi6whb1qP5FrnWUg

https://www.dropbox.com/scl/fi/15k1oufc1bdnmtthlvbe8/lesson-to-learn.heic?rlkey=sgq0970dw33medi6mk29ceupv&st=vyoi58g9&dl=0

The white streaks running down the Glass are caused by rainwater slightly dissolving the lead, which you can just see above the glass, and taking tiny amounts of lead oxide down the glass. You might think that you could just clean this off easily. You can’t. The lead oxide etches the surface of the glass irreversibly. Ugly and fully preventable.

All architects, glaziers, conservatory manufacturers and in general anyone who specifies glass for use on roofs needs to understand this. And never use lead above glass.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310665#Comment_310665 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310665#Comment_310665 Fri, 15 May 2026 09:30:37 +0100 sgt_woulds
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.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310670#Comment_310670 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310670#Comment_310670 Fri, 15 May 2026 12:58:55 +0100 tony
https://share.icloud.com/photos/066qjqEKhBi6whb1qP5FrnWUg]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310689#Comment_310689 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310689#Comment_310689 Mon, 18 May 2026 08:25:55 +0100 sgt_woulds
We are not allowed to access any download/upload sites :-(]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310693#Comment_310693 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310693#Comment_310693 Mon, 18 May 2026 10:58:06 +0100 djh
cut down to be small enough]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310694#Comment_310694 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18434&Focus=310694#Comment_310694 Mon, 18 May 2026 13:21:48 +0100 tony