Roofs like that look amazing, however I'm usually worried will the roof suffer from the plants growing on it?
I know it should depend on the materials used, but do you have any good information on how it affects the lifetime of the roof? Even though that looks really nice I wouldn't do it myself if I had to replace my roof much faster than with a regular roof.
Still, that looks amazing and I'd love to have a roof like that!
From what I read the roof will last longer! It's not exposed to the sun and doesn't feel the effects of the pounding rain. 50-60 years!
Protection from sun and rain is true, however I'd be worried about the potential acidity and wetness which comes from vegetation. However that's why it'd be important to pick right kinds of materials on the roof to get that working.
I would love to find some older roofs with planned vegetation on them to know how well they have been doing.
There is much to delve into that's for sure.