"Any idea what the r value is on the living roof?"
I couldn't even guess what the r value would be. The comfortboard itself is R6. I imagine the r value will change dramatically once it gets wet as well.
"Is the synthetic medium the norm? Do you have to fertilize much then?"
From what I've read (a lot, all online) 10% organics seems to be the norm but many argue for less. Keep in mind we'd planned to plant with Sedums. Apparently these plants get all the nutrients they need from rainwater. Seems counter intuitive somehow, we'll see. We have some growing successfully at ground level in a bed of 3/4" drain rock and others growing in 100% wood chips so they're certainly not fussy.
"Do you put any soil up there? What do the plants grow from or use for nutrients? Or did you just use a planter and cover it?"
There's no soil and no planters. Until some roots develop a gust of wind could blow them off as they're just sitting on the rock wool with ~1" of rubber mulch butted up to them.
Note: I think goats would frown on this substrate :-)
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