Frenchie
Jack of all trades
I gotta side with Eric, half-way - I've seen drywall-and-mastic last a surprisingly long time.
BUT...what a nasty mess when it does go!
By the time the tiles start falling off, the only thing holding them up is each other, and grout; the few bits of sheetrock that are still there, have turned black with mold (the paper is long gone), and the framing's so rotten you have to replace it.
A lot of unnecessary, and easily avoidable, damage - why risk it?
Make sure you have a gap at the bottom so water won't wick out, Kerdi it - you'll have increased the lifespan, and limited the odds of serious damage later, by a HUGE margin.
BUT...what a nasty mess when it does go!
By the time the tiles start falling off, the only thing holding them up is each other, and grout; the few bits of sheetrock that are still there, have turned black with mold (the paper is long gone), and the framing's so rotten you have to replace it.
A lot of unnecessary, and easily avoidable, damage - why risk it?
Make sure you have a gap at the bottom so water won't wick out, Kerdi it - you'll have increased the lifespan, and limited the odds of serious damage later, by a HUGE margin.
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