I am doing the bathroom again. The original floor was removed leaving the wood floor.
On top of wood floor I put an additional wood board and on top of it a cement board was screwed in. Walking on the cement board never made any noise. Therefore go ahead with putting the tiles. I have 90 % finished putting the tiles but noticed that when I walk on the floor it makes squeaking noise. I am not sure how to get ride of it. Do you have any suggestions ?
Thanks
Mona

Get under the floor and have someone walk on the squeeky area while you are looking for movement. Probably a few nails loose on a floor joist.