[header] How to replace tile floor [title] Decide whether or not to tile directly on top of the prior layer. [step] If the old tile is securely installed and in good condition, you can save yourself a lot of time by just laying new tile on top of it. However, the floor level will change a bit. 
If you rip up the old tile, it will take more time, but you can guarantee that the subfloor is secure. [title] Tap each old tile lightly to check for looseness.