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Are you thinking of covering the roof itself with soil (i.e. Green Roof) or of using totally self-contained planters?
My wife and I grow lots of veggies on our roof (we have around 1200 s.f. of flat roof) using "earth box" planters which are totally self-contained and have a water reservoir. Very convenient for us. If you're considering having the soil sitting on the roof surface there is a lot of info out there on how to do this, but you will need a special roof membrane, must allow for adequate drainage, etc. The greatest concern IMHO is making sure the structure can bear the load of what you're considering.
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Grant
In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 1995 Toyota Land Cruiser, 2011 Pursuit 315 OS, 2022 Tesla Y
Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S
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