I'm finishing a basement and have 8 foot and half concrete walls that I will be placing a stud wall in front of. I've scoured the net only to find a large number of opinions. My basement wall has an exterior guard done by superseal which provides this dimpled plastics that goes around the entire basement foundation and slab. My basement has been ultra dry, the saran wrap test yielded no moisture. Books stored down there look new.
So my question is, which method should I use for my foundation walls?
A) based on the Mike Holmes approach I should be using 2" XPS rigid foam board with tuck tape and then spray sealed for the vapor barrier followed by stud wall with no plastic vapor barrier. Bottom plate is treated.
B) gap between concrete wall and stud wall, stud wall with treated bottom plate, insulated with Roxul mineral rock insulation and then plastic vapor barrier.
Going the XPS rigid way is quite a lot more and I'm not sure it would provide more value.