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Inuslating an unvented rubber roof, please help

I have an Victorian home with a mansard roof. I've asked here before and gotten good advice and have insulated most of the home, but I'm still not sure what to do with the almost flat rubber roof.

****** advice about Mansard roofs discuss soffit vents, but there are none on my house. Besides, the soffits are a good 8 feet away from the roof and I think there is a beam or two blocking that path.

I've read that spray foam is great because it stops moisture migration, and that it is terrible because it traps a leak causing rot. It's also expensive and would require hiring a contractor which seems to take months...

A town inspector advised me to use fiberglass and baffles and then a roof vent, but I'm not sure he listened/understood there are no soffit vents... Can this be done without soffit vents? I don't like the idea of punching a hole in a rubber roof but if this is the best way I will do it, and I don't understand how a roof vent would do anything if there was no path for air to get into the roof (other than warm moist inside air...)

A ridiculously expensive contractor wrote to me "VENT ROOF ASSEMBLY from interior." Is there such a thing as venting a roof to the warm, moist interior of a home?

Right now it seems my ceiling most closely resembles a cathedral ceiling (with a bend), and most ****** sources say to NOT vent a cathedral ceiling.

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