Finishing basement walls / Discussions

...basement walls with.  Do I need to install drywall on those walls prior to installing the T&G?  The walls in question are exterior walls, they are 8" poured concrete, with a 1/4 foam board (because they were pre-studded) then batt installation.  The exterior walls are exposed on the outside.  I run a dehumidifier d...

...basement is unfinished and any moisture could easily dry to the inside.  Now I’m looking to finish a portion of the basement and I don’t want to cause any problems by trapping moisture. I’m planning on putting 2” of XPS against the foundation and framing an interior wall inside of that.  Option 1 is to piece the XPS to...