As I'm afraid of heights I usually evade getting on our roof, but today I had no excuse as we are going to renew our roof and wanted to use the opportunity to get rid off stuff in our attic without moving it through the whole house. In fact I could just enter through the roof hatch from our house and didn't have to climb from the garageroof over a ladder to the roof. Better way for me. 
When up there I could clearly see it was really time to renew the corrugated iron as it was still the original one from 1963 and hadn't been painted recently. There was quite a bit of rust and it wouldn't last many years from now. So better do it now. Will be my last time up there for the near future!