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Green roof

For the past 3 years my compact 4x2 shed has stood with only a lick of brown paint to spruce it up. But now, I look at its gently sloping roof and think maybe I should do something with it..
Originally I was put off by the fact the roof leaned towards the fence which it sits right by, thinking whats the point if I can't see them. But then, I would see a bit of it and the flowers produced by sedums, plus butterflies adore the flowers.
Rambling aside, its 4x2, leaned against a fence with a pond right beside it, and the house wall the other end. Would that be a hindrance in installing a green roof? How do I tell if my mini shed can hold such weight?
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From what I have seen on telly etc you should be able to create one if you have a ladder
I'm sure it will take the weight as if you use sedums they only need minimum soil. You could sprinkle flower seeds that are bit taller so you could see them and plant trailing plants too on your side as they will fall over the edge in your sight
Looks to be asphalt
@Beansmum Good idea about the trailing plants, but I could only put them on one side which is facing the house wall. I'm not too fussed about seeing them, so I don't mind sedums.
I've done four or five, on different surfaces. There's a good product that is made up of interlocking plastic units, which comes already planted with various sedum species. I used that type on a 12ft shed roof, but I did have to brace and support the roof from inside to ensure it would take the weight. For a little roof like yours it might be cost effective to do it yourself. I would make up a frame with a base (as said, felt isn't the best or strongest surface on which to plant), and fill it to about 2in deep with a free draining substrate and plant it up with small plants, saxifrage, trailing small sedum species, perhaps erigeron karvinskianus etc, .
H-C