Andy Engel Basement Floor Insulation with cork flooring
There are numerous threads about Andy Engel’s famous article on the stay-dry no mold basement flooring approach (XPS covered by plywood). I have a couple questions that I cannot find answers to
1) Some sources seem to suggest completely blocking moisture (for example, discussions on green building advisor and building science corporation websites) while Andy’s advice is to allow some drying to the interior. Allowing some drying makes sense to me but I would appreciate guidance and to hear how various approaches are holding up over time.
2) Should I put a vapor barrier under the XPS if the concrete slab stays dry? It has an epoxy coating already but I can add a layer of plastic or dimple sheet.
3) We would like to install cork flooring over the plywood but I have not been able to find permeability ratings for cork flooring products. It seems that the flooring should be at least as permeable as the XPS and plywood (perm ratings below 1 but still more permeable than a barrier or than vinyl flooring)