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The number of boxes of tile you need depends entirely on the amount of tile in each box or case. Different manufacturers package their tiles differently, and boxes contain different amounts of tile depending on the size, shape, and material. Often, the amount of area that a case will cover is listed in the product description. To calculate the number of boxes you need, take the total square feet of the space and divide it by the number of square feet the box will cover.

No, tiling over painted walls or wallpapered surfaces is generally not recommended. Textured surfaces and paints will affect the adhesive, possibly causing tiles to lift or fall off. Painted walls with a semi-gloss or high-gloss finish are particularly difficult for adding tiles. It’s wise to strip the paint first if you install the tiles to drywall, although it’s still best to opt for a cement backer board.

The best bathroom floor tiles are strong enough to withstand the weight of a clawfoot tub. However, professional tile installation is essential. If the tiles are uneven or improperly fixed, they may crack under the pressure. Be careful when installing the tub—if it drops or drags on the tiles, it could easily cause scratches or cracks.

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.