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Tile shouldn’t be set tight against the tub. Bathtubs can expand when filled, and they can shift slightly with the weight of occupants. For this reason, it’s important to leave a slight gap between the bathtub and the first row of tile. Aim for a narrow gap of approximately 1/16 of an inch, filled with caulk, to allow for this expansion and movement while still allowing for tile shower waterproofing.

You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

Yes, your shower pan goes underneath your tiling and helps prevent excess water from seeping into the floor. Without the shower pan under your tile, water will seep through the grout and into the flooring. This will eventually lead to mold growth and serious water damage that could cost thousands of dollars to fix.

When tiling over concrete, you should install an anti-fracture membrane after the concrete has been prepared. The anti-fracture membrane acts as a moisture barrier and should be installed to protect the tiles from moisture which helps maintain their integrity. Often, Ditra, a brand name, is used interchangeably with moisture barrier.