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Yes, but you should only put tile directly on drywall in smaller areas that don’t experience excess moisture. For example, a small kitchen tile backsplash could work, but installing tile directly on the drywall in a bathroom or other chronically damp area is not a good idea. Either way, a cement backer board is a far more reliable solution, as drywall is susceptible to moisture and can warp or cause your tiles to crack.

Glass tiles are among the most difficult to install. This is because their transparency makes the adhesive visible, and any imperfections on the opposite side are also likely to be visible. Glass tiles also must be handled carefully during installation, as they are prone to scratching. For these reasons, glass tiles often require professional installation to get the most out of their beauty and unique look.

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.

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.