I did my first bathroom in my own house when we first moved in. It was my largest DIY project. After about 18 months the tiles cracked on the floor. 2 cracks right across the floor exactly the same distance as the floor boards.
Another month or so later a large tile fell off above the Bath
Skim plaster is a couple of mm thick. NOT enough to support a large tile.
PVA is water based. When it gets wet it it turns sticky again. and the tiles will fall off.
I learnt my lesson. And every bathroom since has been done correctly. Some may say overkill. But my wetroom hasn't leaked into my kitchen yet.
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