I’m closing in a covered back porch to make a future office. I was hoping the insulation would stop the condensation, but as it got pretty cold last night, and warmed up this morning, the bottom of the metal panels began pouring water through the insulation.
To stop the condensation, I’m thinking I can
(1) Take up the metal panels, put plywood down over the purlins, then tar paper over the plywood, then re-install the metal panels, or
(2) Take up the metal panels, install 1/2 inch foam board insulation panels on the purlins, then re-install the metal panels.
I’ve researched a little about spray foam, but not sure how effective it would be.
Any suggestions would be greatly appreciated