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You can buy metal upstand edging. It is pricey af though.
I built a wooden upstand (far more fiddly when it came to laying down the EPDM layer) with zinc capping (also pricey af).
There are pebbles around the edges, with a cheap lawn edging strip that has now become redundant as the sedum had bedded in.
NotThamesWater
Lanterne_Rouge
I have a shed question. I built a shed and put on some terrible roofing to get it through the winter. I want to put on a green/sedum roof. What I can't work our is how to deal with the ridge and the perimeter finishing. How do I do that?