Foam board insulation / Discussions

...foam board (because they were pre-studded) then batt installation.  The exterior walls are exposed on the outside.  I run a dehumidifier during summer months and a wood stove in winter months.  I am in zone 5.  I am just a little unsure if i should install drywall before installing the T&G, any advice?  Thank You  ...

...foam (at least two will act as a vapor barrier), and more is better if you have the space. I would cut them to size, squeeze them in as tight-fitting as possible and foam any gaps.  EPS foam is a less environementally harmful option than XPS foam, but either will work. If they are deep cavities you can even put batt in...

...foam panel to the exterior would likely cause that trapping of moisture you are already aware of as foam will act as a vapor barrier. First here is our page about how to insulate the exterior or walls. I think a safer bet for you would be using something like mineral wool rigid insulation panels.