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I had the same problem on a third floor shower I built by hand. Under advice from Trekkor I was given the exact steps for making in waterproof and it's been good for four years now. You may want to PM as I can't remember all of them, but it was a ton of work creating the layered concrete floor.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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