Hi guys. I have a covered porch, with metal roof attached directly to purlins, which are mounted on 2x6’s. Of course, it condensates, worse in spring in fall, but pretty much all year. I want to close it in, and make it my office, and attach part to my bedroom for a master bath.
What’s going to be the best way to stop condensation? My thinking is the best way is to remove the metal roof, and put a vapor barrier between the purlins and the metal roof, but that is next to impossible.
Next thought is put either put 3" insulation with vapor barrier, leaving a 2 1/2 in air space between insulation and metal roof, or putting 6" insulation, not leaving any air space. I’m not sure how I’d vent the air space anyway, unless the ridges in the metal roof is enough air flow.
Rigid foam between all the purlins, but I think the purlins would still sweat.
Also, the ceiling is pretty low on the back side (6’6). I would like to just condition the whole space, but not sure how to deal with the condensation