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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.

For professional labor and materials, it would cost between $6,000 and $28,000 to install 1,000 square feet of Saltillo tile flooring. If that’s out of your budget, you could consider laying the tiles yourself or choosing a less expensive type of flooring. For example, vinyl flooring costs just $2 to $7 per square foot, so for a 1,000-square-foot space, you’d pay $2,000 to $7,000.

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.

Uniform spacing between tiles is important for a professional and clean appearance. To achieve this spacing, tile spacers should be placed between the tiles and left in place until the mortar hardens and the tiles are secure. You can use X-shaped spacers vertically in between the tiles and laid flat at the corners.