How to Tile a Bathroom Floor

Bathroom Floor Tile - Mosaic Tile, Bathtub

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Overview
  • Working Time: 4 hrs
  • Total Time: 4 hrs
  • Yield: 40 square feet
  • Skill Level: Intermediate
  • Estimated Cost: $200 to $500

Bathroom tile is one of the most durable, moisture-resistant, and beautiful types of floor coverings you can use in that space. Installing your own bathroom tile is an intermediate-level project with a moderate learning curve that most homeowners can accomplish—for gorgeous results and for superior performance.

Basics of Bathroom Floor Tiling

One of the best things about tiling a bathroom is that it is typically a small project, and this lends itself to the user slowing down and perfecting one’s tiling skills. Yet bathroom floors receive a lot of attention. Any mistakes you make will be seen day after day. Moisture is also a factor. Short of tiling a shower pan, tiling a bathroom floor requires the highest degree of floor waterproofing found within the home.

Tiling tools and materials can help. Uncoupling tile membrane, installed between the subfloor and the tile, adds waterproofing and breaks the bond between the subfloor and the tile, preventing tile cracking. Plastic tile spacers create perfectly spaced tile seams with no need for guessing. Notched trowels dispense the right amount of thinset. Pre-mixed thinset eliminates the need to mix up dry thinset mix with water. With these aids, most do-it-yourselfers should be able to tile a bathroom floor.

Codes, Regulations, and Permits

Installing bathroom tile may be subject to local building codes and permit requirements. Check with your local permit office for information.

When to Install Bathroom Tile

When you are only tiling your bathroom and making no other changes, you do not need to remove the cabinet and shower/bathtub—you can tile right up to the edge. If this is a complete bathroom remodel, you may wish to tile under the cabinet as this gives you the freedom to make changes later without retiling. Always install tile before installing the toilet.

Safety Considerations

Operating a wet tile saw can be dangerous not only because of the cutting blade but because wet tile saws mix water with electricity. Consult your wet tile saw’s instructions for safety guidelines including, but not limited to, creating a drip loop in the electrical power cord and plugging the saw into a GFCI outlet.

What You'll Need

Equipment / Tools

  • Notched tile trowel
  • Rubber tile float
  • Chalk snap line or laser level
  • Multi-tool with wood cutting blade
  • Wet tile saw
  • Rail tile cutter
  • Tile nipper
  • Indelible marker
  • Tile spacers
  • Bucket

Materials

  • 12-inch ceramic or porcelain tile
  • 3/4-inch tongue-and-groove plywood (as needed)
  • Uncoupling tile membrane
  • Floor leveling compound
  • Thinset
  • Tile grout
  • Grout sealer
  • Grout haze remover

Instructions

  1. Prepare the Bathroom

    Remove as many items from the room as possible. Remove the toilet. Remove baseboards. If feasible, remove the door jambs; if not, you will later be able to undercut them.

  2. Prepare the Subfloor

    The bathroom subfloor should be flat, level, and free of damage. When remodeling an old bathroom, you may find water damage near the shower/tub, toilet, and sink. Replace any damaged subfloor with like material. If replacing the entire subfloor, use 3/4-inch tongue-and-groove plywood. If the subfloor does not need to be replaced but has low spots or minor dips, mix and pour a floor leveling compound on those spots, then allow to fully cure.

  3. Install the Uncoupling Tile Membrane

    With a tape measure, transfer the size of the bathroom floor to the off-site uncoupling tile membrane, placing the marks on the membrane with an indelible marker. Cut the membrane. Prepare the subfloor by skimming out unmodified thinset grout, then press the membrane into the still-wet thinset. Press firmly to seat the membrane. Let the membrane and thinset bond for 24 hours.

  4. Design the Tile Layout

    Depending on the size and style of the bathroom, as well as the tile itself, you have many tile patterns to choose from, such as grid, brickwork, and diagonal. Strike a line down the center of the room with the chalk snap line or laser level’s vertical line feature. Use the tape measure to determine the center point.

  5. Dry-Fit the Tile Layout

    Dry-fit your tile, working from the center line outward. Experiment with different positions. Ideally, the most visible sections should receive full-size, uncut tiles. 

  6. Cut the Door Jambs

    If you left the door jambs in place, lay a tile with a thin cardboard spacer underneath the tile. Mark the door jambs with a pencil. Remove the tile and spacer, then cut the door jambs with the multi-tool.

    Good to Know

    The cardboard spacer accounts for the height of the thinset mortar.

  7. Fill the Tile Membrane Cavities

    Mix up the thinset (if a dry mix) in a bucket. With the straight, un-notched side of the trowel, fill the tile membrane cavities with thinset mortar.

  8. Install the Tiles With Thinset

    Use the notched side of the trowel to spread thinset mortar across a small section of the floor, generally about 2 feet by 2 feet. Butter the back of a tile with the thinset, as well. Press the tile firmly onto the floor. As you progress to adjacent tiles, insert tile spacers.

    Tip

    Watch for lippage—where one tile edge is higher or lower than its neighbor—as this is a safety hazard.

  9. Cut the Tile

    As you move through the installation, cut the tile to size, as needed. Edge tiles can be cut with either a rail (or snap) tile cutter or a wet tile saw. Cutouts for field tiles (namely, for the toilet) can be cut with a tile nipper.

  10. Apply Tile Grout

    After the tile has fully set (about 24 to 48 hours), mix tile grout and apply it with the rubber grout float. Pull the float firmly toward you, diagonally across the tiles.

  11. Remove the Grout Haze

    After the grout has cured, add grout haze remover to the bucket with cool water. Clean the grout haze from the tile surface with the tile sponge.

  12. Seal the Grout

    After the tile has dried, apply grout sealer. This will prevent water from percolating through the tile seams and under the tiles.