The shed roof looks like my plastic fence you asked a picture for except the fence is quite a bit darker and thicker - probably 50mm thick.
ps - spray your roof with roof moss killer - did mine and scraped all moss off and it's been moss free for years - just spray a weak moss killer solution over it once a year - looks so much better.
ps - spray your roof with roof moss killer - did mine and scraped all moss off and it's been moss free for years - just spray a weak moss killer solution over it once a year - looks so much better.

Couldn't be bothered to drag the ramp out and prop it with blocks for the sake of the 1hour of remaining daylight, so just filled buckets.
(definitely going to get due criticism when I start posting my DIY posts)
. I've put water based over oil, but obviously didn't prep properly.