I really don't think moisture is going to be a problem. For one thing, the radiant barriers come in two forms, perforated and unperforated. I'm using the perforated kind and that's what you should use if you want to let the moisture out.
Also, at night the roof will get just as cool as the outside weather because the sun no longer beats down. There's just a lag time before that happens. So there's no reason to keep the attic damper closed during those hours. That should clear out any moisture.
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