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Insulating a vaulted ceiling

I am building a small cabin and looking for proper info on insulating a vaulted ceiling. The roof has a metal roof over 30# tar paper on 1/2 plywood decking.Rafters are 2x8 on 16" centers. What are my options and the best way. Thanks Gary

Re: Insulating a vaulted ceiling

If I was doing it I would put a sandwich on the roof. Plywood, 1" 0r 2" ridged foam, and another layer of plywood. I would also prefer to use 3/4" plyat least for the first layer, less chance of sagging over time.

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