Should I install a poly moisture barrier before the rigid foam board against a basement wall?
...Poly against the wall for moisture and radon protection, 2" rigid XPS foam board insulation held in place with the special plastic pegs (since the poly will not allow adhesive to affix it to the wall), blue sheathing tape on foam board joints, 2X4 stud wall 16" on-centre spacing, mineral wool batts, Smart barrier vapou...