Soldato
Good plan pulling up the floor boards and replacing with thick ply.
Can save you a lot of grief, I've seen floorboards twisted despite being screwed down, caused no end problems with the ply & tiles laid on top.
It's a longer job ,more expense using 25mm compared to 18mm, but the results are worth the effort.
The bathroom in my present house has 6mm ply laid over floorboards, it's terrible, boards are loose, toilet bounces slightly.
And when I removed the bath panel, the bath was only sitting on 4x2 bearers, done a temporary repair, by removing bath, & putting down a 36mm sheet of ply, until I have the time to completely refloor the room.
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