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Metal roof over unvented cathedral ceiling

Birdie L | Posted in Energy Efficiency and Durability on

Seeking advice on this application.

Center of home is Unvented Cathedral Ceiling with Closed Cell (possibly flash and batt to reach R value). On top of the sheathing will be asphalt felt, then metal roof. We purchased the Classic Rib from Metal Sales.

Sides of the home are Vented Attics with fiberglass insulation. Also to have asphalt felt on top of the sheathing, then metal roof.

I called Metal Sales, and they stated the metal roof can be installed directly to the underlayment.
Does anyone see any possible condensation issues?

Climate Zone 5.

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  1. GBA Editor
    Martin Holladay | | #1

    The representative from Metal Sales is correct. As long as you have installed a layer of asphalt felt underlayment, you don't have to worry about condensation.

    -- Martin Holladay


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