Here are a couple of photo's. It's not tin because it is quite soft. I think it's zinc. The next time I see my roofer son I will ask him what it is called. You can bend it with your hands, hammer it, drill it etc.

Attachments
20180502_083111.jpg (142.33 KB, 19 downloads)
20180502_083129.jpg (119.01 KB, 19 downloads)
20180502_083148.jpg (144.94 KB, 19 downloads)