I currently have a dated ceramic bathroom tile floor originally installed over a cement and mortar base. Is it possible to tile on top of the existing tiles with thin set mortar? If so, are there any preparations to the existing tiles required? -James
Yes, you can lay tile over an existing tile floor as long as it is in good condition with no major cracks or settling. Keep in mind, however, that it will raise the height of the floor, which might require cutting off the bottom of the bathroom door. You will also need to take the toilet out before installing the tile and replace the existing toilet flange bolts if they aren’t long enough for the added height.
If any of the old tiles are loose, reattach them to the floor, and fill in any missing spots. After cleaning the floor thoroughly, lay the tile with thin-set adhesive.