- 1). Mark the wall with the dimensions you want for your backsplash, using a pencil, square and level. Make the square or rectangular shape big enough to hold full marble tiles with no cuts. Leave a few inches of extra room around the perimeter of the area to allow for placement of the trim tiles.
- 2). Spread thinset over the marked out area with a notched trowel.
- 3). Press the marble tiles into the thinset in horizontal rows, starting along the bottom of the space and working your way up row by row. Put spacers between all the tiles, including below those on the bottom row, to separate them from the countertop.
- 4). Spread thinset over the back of one trim tile using the trowel. Press the trim tile against the wall, alongside the tiled area, so the finished edge of the tile faces outward. Put spacers between the trim tile and the marble tiles.
- 5). Hang the rest of the trim tiles in the same manner, building them all the way around the perimeter of the backsplash.
- 6). Let the mortar set for 24 hours. Remove the spacers.
- 7). Spread unsanded grout over the backsplash with a grout float, forcing it into the spaces between the tiles. Wipe up the excess with a dampened sponge.
- 8). Let the grout set for 24 to 48 hours. Caulk along the bottom line of the backsplash, where it meets the countertop.
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