What roof underlayment can be used on a non-vented metal roof?
I’ve put up a building that has a 14/12 pitch non vented roof but now the building inspection dept. is hassling me over using Titanium UDL30 underlayment under the metal roof. They say it doesn’t breathe and can rot the roof sheathing. The ceiling is R49 with 4″ of foam against the plywood sheathing followed by 8″ of fiberglass and 2 layers of 5/8″ firesheild drywall.
I’d like to know 2 things – are my building officials wrong and if they’re not what type of underlayment is allowable under a hot metal roof? I’m in the midwest in zone 6a.
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