Wheel house help!

[MNoutdoorguy]

I have a 6.5x14 Ultra Shack. I'm guessing was built early 2000s. Had to tear apart interior walls due to moisture build up. Steel frame, with aluminum 1.5x1.5 or 1"x1" tube studs. Previously insulated with pink board foam between studs, with a thin quarter inch thick foam pad glued to the studs, then paneling glued over the top of it all. I'm thinking the issue was no vapor barrier? I have it all torn apart down to the studs. Wondering how I should finish it, use a vapor barrier such as poly? Or no vapor barrier? Any help is appreciated! Thanks! 

-Nate

[avidleech]

Moisture is likely condensing on the metal studs and being transferred to the paneling. Furring strips will probably be the best bet with metal studs. You can run them horizontal or vertical and then just attach the paneling to that. I personally wouldn't use a vapor barrier. Some guys do though. 

[castmaster]

Use 1x2 (actually 3/4"x1 1/2") PVC trim boards for firring strips on the face of studs. The PVC won't absorb any moisture and works well as a thermo break from the aluminum studs. They can be found at any of the big box lumber stores.

[Moon Lake Refuge]

I would fur it out another inch, then spray foam and finish to the furring strips.  No vapor barrier needed at that point.