#AskMike Can I install tile over tile? No. Always remove the old floor before installing the new floor. Ceramic is heavy. Add on top of that a completely new floor, and you’ve got a very heavy load. If your home was built to minimum code it’s not built to carry that much weight. Your floors should be watertight in the kitchen and bathroom. You need a waterproof membrane, like Ditra from Schluter-Systems North America. Some homeowners and contractors think you can lay your new tile directly over