Fixing plywood on wooden floorboards for ceramic tiling

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I'm told by person doing bathroom refurbishment that the plywood has to be fixed down with latex on wooden floor, and not nailed down before, fitting ceramic tiles. I suppose this is so that the ply doesn't flex. Is this the best way to fit the ply?
 
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Firstly, you would never use nails only ever screws.

Is he using ply or tile backer boards to overboard?
What thickness ply/backerboard is he using?
What sort of "Latex" is he using?
What is the existing floor made of?
 
The existing flooring (upstairs bathroom) is wooden floorboards but with I think old corktiles which were covered by ply when vinyl flooring put down on top a couple of years ago. I assume the contractor will have to lift the vinyl flooring, old ply (which was probably screwed in), also remove the old cork tiles and then put down new ply. I don't know what thickness he will use of ply or what latex. I would go for another new vinyl flooring but worried this might not be really waterproof round the shower which is being put in when bath taken out.
 
All the floor coverings over the original floorboards must be removed or it’s unlikely your tiled floor will last. You can overboard the original timber floorboards (I would not advise it with chip board) using either 12mm WBP ply or tile backer boards but some advocate using thinner ply or 6mm backer boards & fix using both glue & screws. The solution I prefer is to remove the old floor completely, especially with chip board, & replace it completely with 18mm – 25mm WBP, depending on the floor structure. I would certainly get a clearer picture of what you tiller is going to do or you may be back on this forum in a couple of weeks asking how to sort out the mess he’s left you in.

It rather depends on what look you want but, believe it or not, a Vinyl floor when properly laid will be more waterproof than a tiled floor. In wet rooms, specialist preparation & products will be used but conventional tiles & adhesive will quiet happily cope with the odd spills of water normally associated with using a shower or bath.
 
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Thank you for your advice. Wil now have to decide whether to go for vinyl or ceramic floor tiles.
 

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