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Vapor & water proofing a steam shower - does this sound right?

10 years ago

I asked my GC how he is going to vapor proof the steam shower. He said they have a company come out to "hot mop" (hot tar over "felt") the pan (mud bed) and up the wall 12" to make sure the pan doesn't leak. They use green board, then a waterproof craft paper membrane (when I asked what kind of paper he said 60 minute jumbo tex building paper), then chicken wire, then hand applied concrete, then tile.

I mentioned I had read that Kerdi over cement board worked well as a vapor barrier in steam showers, and his response is that we are not using cement board. Can someone tell me if what he described will work to vapor proof and water proof the steam shower?

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