How to Remove an Old Tile Floor
Follow these step-by-step instructions to remove an old bathroom tile floor.
Empty the room and remove any fixtures that may impede the process of removing the tile. Turn off water supply before removing a sink or toilet. If removing a toilet, drain reservoir, remove bolt and rock the fixture to break wax seal.
Locate or Create a Starting Point
If tile has been installed around a vanity or other semi-permanent fixture, a bare edge will be exposed, providing a good starting point for removal. If tile is wall to wall, it may be necessary to use a hammer and chisel to break out a tile to create a starting point for prying up tiles. Tiles may be attached using adhesives or mortar and may come up easily or require great effort, depending on how it was affixed and the type of underlayment used. A hammer and chisel, pry bar or pole scraper can be used to remove tiles.
From the starting point, continue to pry up tile. Deposit tiles in a trashcan or large bucket as they are removed to minimize clutter. Remember that tile can be heavy and an overfilled waste receptacle will be difficult to haul away.
In some cases, tiling may have been attached directly to a concrete floor or sub-floor, but a plywood or mortarboard underlayment is common. An inappropriate or damaged underlayment should be removed, but some may be left in place for re-use. Access the underlayment and remove to expose the sub-floor, if necessary.
Use a broom or shop vac to clear all debris from the floor.
Remove Exposed Nails
If an underlayment has been removed, it may be necessary to remove or pound in exposed nails to leave behind a flat surface.
Once the old tile floor has been removed, inspect the subfloor for damage that my need to be repaired before a new floor is installed. Patch or replace any rotten wood or divots in concrete floors. The subfloor should be smooth and damage-free before a new floor is installed.
step by step instructions can be found on DIY Network http://www.diynetwork.com/how-to/skills-and-know-how/masonry-and-tiling/how-to-remove-a-tile-floor