How to Install a Tile Backsplash

Turn off power to any outlets or switches in the backsplash area. Remove the cover plates. Clean the wall with TSP or degreaser to remove cooking grease. The wall surface should be clean, dry, flat, and free of loose paint. If the wall is textured, sand it smooth — mastic needs a flat surface to grip. Mark a level line at the bottom of where the first row of tile will sit.

Lay tiles on the counter against the wall (with spacers) to determine your pattern and see where cuts fall. Center the layout so that cut tiles at each end are equal width. Avoid having a sliver of tile at an edge — it looks cheap and is hard to cut. Mark the center of the wall and work outward. For subway tile, plan your offset pattern (typically 50% or 1/3 offset).

Spread mastic adhesive on a 3-4 square foot section of wall using a V-notch trowel. Hold the trowel at a 45-degree angle to create even ridges. Press the first tile into the mastic with a slight twisting motion. Place spacers at each corner and continue setting tiles in your planned pattern. Check level every few tiles — corrections get harder as the mastic sets.

Use a manual tile cutter (snap cutter) for straight cuts — score the tile surface and snap along the score line. For cuts around outlets and switches, measure and mark the tile, then use a wet saw or tile nippers to make the cut. Outlet openings are typically cut by making two parallel cuts and snapping out the waste. The outlet cover plate will hide 1/4 inch of tile overlap around the box.

Continue setting tile row by row from the bottom up. At the top, measure each tile individually — the distance from the last full row to the cabinet or ceiling often varies. Cut top-row tiles to fit with a 1/16-inch gap at the top (the gap will be hidden by the cabinet or caulked). Use tape to hold any top-row tiles that tend to slide down while the mastic sets.

Let the mastic cure for 24 hours before grouting. Remove all spacers. Mix unsanded grout to a peanut-butter consistency (or use pre-mixed). Spread grout over the tiles using a rubber float held at a 45-degree angle, pushing grout into every joint. Scrape off excess at a steep angle. Wait 15-20 minutes, then wipe with a damp sponge in diagonal strokes to clean the tile face and smooth the joints.

Apply color-matched silicone caulk where the backsplash meets the countertop, inside corners, and around any fixtures. Use painter's tape for clean caulk lines. After the grout has cured 48-72 hours, apply grout sealer to all grout joints. Reinstall outlet covers (use longer screws if needed to span the added tile thickness). Stand back and enjoy your new backsplash.