Vapor barrier at interior high humidity locations?
Location: Ottawa, Ontario
Wall is 12″ thick R44:
2″ R8 EPS, zip system sheathing, 2×6 c/w R22 Rockwool, Intello+ interior smart vapour retarder, 2×4 c/w R14 Rockwool, interior finishing as specd
It is a limited vapour open wall in both directions.
I have a bathtub shower combo (acrylic base and acrylic surround), and a shower (acrylic base and tile over waterproof gypsum) against the exterior wall.
Given that these bathrooms will see elevated humidity should i add some 6 mil poly on the inside of the studs, between stud and the acrylic surround/waterpoof drywall? In these 2 areas of the house the concentrated vapour/humidity will not be able to cross the poly?