Roof sheathing

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Q&A: Insulating a Cathedral Ceiling Under Metal Roofing | JLC Online Ideas, Roof Insulation, Roof Sheathing, Shed Roof, Roofing, Steel Roofing, Metal Roof, Roof Ideas, Conservatory Roof

Q: I need to insulate a cathedral ceiling that will be finished with tongue-and-groove pine paneling. The house has steel roofing installed over 1x3 purlins. There is no plywood roof sheathing. I’m concerned about possible condensation on the underside of the steel roofing, and I would like to know the best way to insulate this ceiling from the underside. Can I insulate with foam board insulation between the rafters? I intend to install a 6-mil poly vapor barrier under the ceiling boards.

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Debbie Boulerice