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@chrisbmx116 I did similar in two different places and and planning on doing the same in my house soon. I have previously used cement board (hardiebacker) and tiled on top with good result and it felt super solid.
I have also tiled on top of ply and I wasn't 100% happy - but that may have been my error. I think I used too thin ply and at some very specific points there was still movement/unevenness which meant the grout cracked. It was barely noticeable but as I had done it I was obsessively looking at it to find fault.
When I do it again soon I'm going to use hardiebacker as it provides a much flatter/solid surface that you'd only achieve with much thicker ply (which means trimming doors etc).
I'm an absolute novice with all this so take what I have said with a pinch of salt but thats my experience to date.
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It’s a rabbit hole once you start... I ended up replacing mouldy chipboard floor boards with the proper P5 stuff, then 6mm wedi board fixed with tile adhesive, seams taped then tiled on that.
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Ive lifted floorboards, coated wood glue everywhere the used lots of good screw to fix them down,,,, cant stand wobbly floors,,, youtube has a couple of vids
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We used 18mm plywood fixed every 15cm. You want something thick enough not to flex. That was for a slate tile floor in a first floor bathroom.
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@chrisbmx116
I have come to the conclusion I'm unlikely rot be able to afford a proper bathroom refit and redesign anytime soon so going to try and do the majority of it myself/just spruce it up.
First up, the floor, crappy plastic tiles that bounce. I want to rip them all up and replace with either large normal tiles or maybe cork tiles (I like cork).
I know I'll have to level the floor, prob with some thin ply? But that's about as much as I know... going to do some googling but if anyone has done similar and has pointers im all ears.