Tiling around a bathtub introduces additional challenges. If the tub is level, set a full tile at its top edge. To help hide the awkward appearance of an out-of-level tub, make the bottom row of tiles at least three-fourths of a tile high. For a shower enclosure, extend the tile and the backerboard at least 6 inches above the showerhead. For a tub surround only, install the backerboard and tile at least 12 inches above the tub. For a high-end look, take the tile all the way to the ceiling. When tiling around a tub, mark the first layout line at the vertical edge of the tile next to the tub. Follow the order shown in the diagram to snap the rest of the lines. If the tub is level, start with a full tile at its rim. If it is not level, start the first row of full tiles at least three-fourths of a tile above the rim. Set shower tiles on the back wall first: Place shower tiles on the prepared adhesive. Start at the bottom of the marked line and work your way up the back wall. Use spacers to hold the shower tiles in place and ensure grout lines stay level. Work carefully to make sure all the shower tiles are level in one area before moving on to the next section. Don’t set tiles around fixtures yet. Editor’s Tip: To keep the first row (and all that follow) level, tack a 1x batten to the backerboard one full tile width above the tub. Cover the tub with heavy paper to protect it from damage it might incur as you tile the wall.
