I just finished reading a book called The Green Roof Manual by Edmund Snodgrass and Linda McIntyre. I think that it does an excellent job of describing the current state of green roof design in North America and it is an excellent resource for both designers, contractors and users. The authors do a good job of explaining the costs, risks and benefits of vegetated roof systems. They include photographs and diagrams that are useful and not just pretty to look at. They don't advocate or advertise for any particular vendor for any of the components of a vegetated roof system.
The graphic featured above shows the best way to waterproof, insulate and install an extensive green roof. Note that the insulation is above the waterproofing. Also, the drainage/water storage area could be done with a coarse aggregate (depending on the circumstances).
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