bathroom remodel

emmsvs

I have a bathroom that i am remodelling. I stripped it down to the studs. One of the walls is on the exterior. I am in PA so a vapor barrier is required on exterior walls.

There is a small part of the exterior wall 2x2 1/2 feet that was closed up from a window that used to be there. This is in the shower area.

The area that was closed up has a foam sheathing, DOw super tough R.

This sheathing is pretty much a vapor barrier.

On top of the exterior sheathing is lap siding.

My question is this. Will this dow super tough cause problems if I put up an interior vapor barrier behind the tub surround. the surround layers from the studs are poly vapor barrier, cementboard, tile.

Keep in mind the area that has the dow board is 2 x 2 1/2. If it will create a problem do you have any suggestions.
Thanks

oh'mike

That will not be a problem---a vapor barrier is needed on the conditioned side if the wall

A better method than a vapor barrier behind the backer board would be to water proof the face of the backer board--then add your tile---

A paint on water proofing like Red Guard or Hydroban is simple and cost effective---

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emmsvs

thanks for the response. I was considering the hydroban but I was not sure that it was adequate as a vapor barrier.

oh'mike

You can waterproof a paper bag with Hydroban---I use it for some of the shower pans that I make----

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