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Installing Diagonal Tiles

This DIY Basic will provide tips on installing diagonal tiles.

More in Floors

Step 1: Watch an Overview Video

Step 2: Gather Your Materials and Tools

Materials and Tools:

tile adhesive
cement backer board & cement screws (optional)
grout mix
grout sealer
speed square
thinset
tile spacers
buckets
power drill
paddle mixer
driver bit
tape measurer
laser level
pencil
wax pencil
level
square-notched trowel
wet saw
safety glasses
kneepads
grout float

Tips:

- Avoid using highly glazed tiles in a bathroom or kitchen; they tend to get slick when water spills on them.

- Buy 10 to 15% extra tile as a cushion against mistakes and future breakage.

Step 3: Clean the Floor and Dry Fit the Tiles

Thoroughly clean subfloor. If subfloor is wood, install cement backer board to stabilize it.

Start in a 90-degree corner. Lay out tiles in a dry run to make sure they fit.

Using a wet saw, cut one tile into a triangle diagonally from opposite tip to opposite tip. Lay half of first tile with cut side facing 90-degree corner and tips almost touching walls at a 45-degree angle.

Trace tile on subfloor with pencil.

Using first tile as a guide, lay out remaining tiles, using spacers to allow for grout joints.

Tip: Parallel guidelines on floor will help keep tiles straight. Set partial tiles on top of and overlapping whole tiles; then mark cut lines with a wax pencil.

Step 4: Cut Partial Tiles and Mix the Thinset

Using a wet saw, cut partial tiles to fill spaces along walls.

Use a drill with a paddle attachment to mix thinset.

Tip: Thinset should have consistency of toothpaste.

Step 5: Spread the Thinset

Using a square-notched trowel, spread a 2-foot square of thinset on subfloor. Don’t cover guidelines with thinset.

Set first tile, then partial adjoining tiles. Use tiles spacers to keep joint lines uniform.

Set remaining tiles.

Step 6: Apply the Grout

Keep tiles at same height by tapping a board across surface with a rubber mallet.

Do not walk on tiles until thinset has dried.

When thinset is dry, use a grout float to fill joints with grout. Mix grout in small batches.

When grout is dry, sponge away film from tiles, then buff with clean rags.

To keep floor looking its best, apply grout sealer to all joints.

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