interesting looking system as there's no exposed fastener. they'd sell a ton of these if you could lap them longer than 12'.

I have this on my porch but it looks awful after the Yellow pollen and dirt that it accumulates you can’t even clean it wash yes but gunk gets in the ribs and you have to literally take the screws out to remove mildew and algae ..looked wonderful at first but after 5 years in the woods disgusting.