Is there a such thing as waterproof backerboard that does not require a separate vapor shield?
I just found out that my contractor did not install a vapor shield in my newly tiled shower. He said it is not necessary because he used cementboard. I thought some sort of vapor shield was supposed to be installed behind the cementboard, but he says I'm wrong.
There are wood studs, then cementboard with caulk, then mortar and marble tile on top. Does this sound like an adequately waterproofed shower? Or am I looking at leakage/mold problems in the future?
Thanks to anyone who can answer my question.