This does not have to do with the tile failing. It has to do with mold or rot deep in the walls.
Watch this video you will notice the pros already have the tar paper behind the backerboard.
http://www.bobvila.com/BVTV/Bob_Vila/Video-0207-03-1.html
This is not to protect the tile or backerboard from failure as a small amount of moisture may eventually make it through even cement. What this layer is doing is protecting the studs , the insulation and whatever else may be inside the wall.
Is it code? Is it neccessary?
Maybe not.
Is it an easy layer to do that is cheap and will provide peace of mind? yes. |
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