Felt vs synthetic with radiant barrier
If the roof sheathing has radiant barrier on it, is there a preference for choosing either felt or synthetic underlayment?
The question is asked with the concern one option may be better suited for sheathing with radiant barrier.
Ie: permeability for example: does the radiant barrier, even with it perforated aspect limit the sheathing drying to the inside if the deck got wet and then one really needs to rely on the underlayment to allow for drying to the outside etc.
Trying to decide on something like 30 felt vs Certainteed Diamondback on a 12/12 pitch roof with possibly roof sheathing with the radiant barrier.
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