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Yes, you can install a backsplash directly onto drywall, provided the wall is properly prepped, clean, and dry. For best results, especially in kitchen areas, your walls should be made of moisture-resistant drywall, often called green board. If your current wall isn't moisture-resistant, it's recommended to replace it before installing the backsplash. For even greater protection against water damage, you can remove the existing drywall and install a tile backer board or cement board instead. While properly installed standard drywall is typically strong enough to support a backsplash, some local building codes may require water-resistant materials in kitchen areas, so it's a good idea to check.

Generally speaking, it is better to cut tile wet when using a fast-moving wet saw to reduce dust and chipping. However, tile can be cut dry when using just about any cutting tool. Dry cutting will result in a bigger mess and may increase the risk of chipping or cracking, but if you’re just making small cuts, dry cutting is a safe and viable option. Cutting dry also means you can apply tile grout sooner, so it’s better for rushed projects.

You cannot tile directly over hot mop waterproofing because tile requires a smooth, solid surface to adhere properly. Additionally, the shower bed pan needs to be raised and sloped toward the drain to prevent water from pooling. However, you can hot mop and apply a sloped mortar bed over the top (to which the tile can then be adhered). 

Yes. You can tile over tile if the old tile is in good shape, but this will also create a thicker floor. As a result, you may have to remove and readjust baseboards and other room trimmings and potentially even raise door heights to work with the higher floors. In most projects, it’s best to remove the old tile before installing a new tile floor.