jasonB
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their P5 is moisture resistant so you won't need to add anything.
For the Amtico the installer will likely lay a thin sheet of ply, laytex the joints and then lay onto that.
Chipboard is not suitable to tile onto, you will need to overboard it with a minimum of 12mm WPB ply depending on your joist spacing. or if this creates height issues rip up the chipboard and replace with 22mm flooring ply or 25mm WBP ply.
You will need to decide on what floor covering soon as the sanitary ware should sit on top of any tiled surface so the plumber will need to know to set them possibly upto 25mm above the chipboard
Jason Jason
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