The way he worded it and then asked a question about a rip off product would suggest that he was asking about the waterproofing not the substrate.I don't think concrete board is overkill at all behind a membrane. When I did my first kerdi job many years ago I used drywall, paperless fiber matted drywall,...didn't like it. Even though Schluter says it's ok...I'll stick to CBU.
You could be right! Lol.TNTSERVICES said:The way he worded it and then asked a question about a rip off product would suggest that he was asking about the waterproofing not the substrate.