I posted this in the general forum but thought i would repost this in the design and planing, sorry for that.

I need some help. I am building a shed roof on my home and I was considering putting a living roof on top. I have a lot of polystyrene rigid insulation to use. From the research I’ve done, I’ve found people will put there EPDM on top of the decking, then put the rigid down, followed by a plastic sheet, gravel, landscape fabric, bark mulch, soil and then plants. My question is about venting and condensation. This plan seems like you would get condensation under the EPDM and would rot the decking. Living up in Canada, I have been a big believer in good insulation and a well vented attic space because we have lots of snow and lots of ice damming issues. I have searched all over and have not found an answer to my questions. What are your opinions to this scenario? Thank you for your help.