I've read a lot of posts about bathroom floor tiling - the general rule is to lay WBP ply first. I'm concerned about the extra height this will create, especially as the wall tiling, skirtings etc are staying put which means I'll have to tile around the toilet & sink pedestal. I have 25mm chipboard floors which are screwed down. The surface is nice and flat; surely I could seal this will something and tile onto it? The tiles I will be using are the small 'mosaic' type that come on a sheet so minor movements won't put to much stress on each tile.
couldn't you board on top with 6mm wbp ply. it wouldn't add too much to the height of the floor. i would be wary of tiling straight onto chipboard. the tiles will stick no problem but if there were ever a leak the chipboard would swell. 6mm wbp would give an added barrier that could make all the difference should a repair become necessary.
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