What type of barrier can I put under metal porch roof that sweats?

Axlerod Goat
Axlerod Goat
Updated: July 15, 2025

After having a metal roof installed over a open porch that was built now i have occasional moisture forming under panels that drips underneath. I now know there should have been a barrier installed but I was not sure about finishing ceiling off, so my question would be, is there any type of condensation spray that would stop that problem? Or should i try and attach rolled blanket in that area was planning on screwing up old barn wood for  antique look but was afraid of moisture running / dripping on wood then thought about just attaching solid light weight metal panels underneath instead ,just was wondering your thoughts if any? thanks.

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