Our roof needs maintenance because the PVC foil that has been under the green roof for 24 years has become unreliable. Especially along the exposed edges, the plasticizers have disappeared from the PVC due to the UV light. Now I am replacing it with 1.52 mm thick EPDM foil.
It is a lot of work to first put away all sedum, stonecrop and other plants and put them back after replacing the foil. And I’m only halfway there because the other half I have yet to start…
I’ve never done anything like this before, so it’s quite an adventure for me…and I’m sure I’m doing things wrong…that’s life!
I think it’s fine as long as the roof doesn’t leak and the plants stay alive!
Wim Harwig 