Anti-condensation barrier / Discussions

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

...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 / drippin...

Posted by Axlerod Goat July 15, 2025 Roof assemblies - renovation