Drying Potential of Bathroom Walls
Planning out a new build in CZ 5/6 which will include a Zip-R wall assembly. It’s designed to dry to the inside (given the poly-iso plus the OSB plus the built in membrane on the Zip panels won’t allow drying to the outside), so will have an variable-permeance membrane (likely Intello) on the inside to allow the wall to dry out if it gets wet.
Now, I’ve seen the pictures online of what happens behind vinyl wallpaper in air conditioned buildings in the summer months where walls are designed to dry to the inside. So I’ve committed to not putting up vinyl wallpaper on any exterior walls.
My question though — my layout has bathrooms on the exterior of the building (we designed it that way to allow for natural light in the bathrooms). How does a wall dry to the inside if there are showers/tubs/mirrors/tile walls/etc. touching the wall?
And if the answer is that it doesn’t dry to the inside, does that mean that I’m setting myself up for a major mold problem behind the bathroom walls unless I can redesign my walls to dry to the outside?
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