How to Lay Granite Tile Grout

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Grouting granite tile is a little different from grouting most other kinds of tile, because you're trying to achieve a special look. Granite surfaces are supposed to be smooth and straight, mimicking a solid slab of stone. That's why granite tiles are milled to have completely flat tops and straight edges/corners with no rounded surfaces. The tiles should be laid very close to each other -- 1/16th inch, as opposed to the standard 1/8th or 1/4th inch. Use smooth grout with no sand in it to accommodate that thin line.

Things You'll Need

  • Thinset mortar
  • Notched trowel
  • Granite tile
  • 1/16th-inch plastic tile spacers
  • Unsanded grout powder (similar shade as the tile)
  • 4-inch putty knife
  • Bucket
  • Rubber grout float
  • Sponge
  • Lay your granite tile in thinset mortar, and spread with a notched trowel. Keep the mortar layer smooth, with no hills or mounds of mortar that could seep up and fill the grout lines between the tiles. Use 1/16th-inch plastic spacers between the tiles. Take the spacers out after installation, and let the tiles set for a day.

  • Mix your unsanded grout in a bucket with water by hand with a 4-inch putty knife rather than with a mixer, which can whip too much air into the grout. Let the grout sit for 10 minutes while the chemicals in it meld. Re-stir it before using.

  • Working in sections of a few square feet at a time, apply the grout to the tile surface using your rubber grout float. Run the float over the lines between the tiles, holding it at about a 30-degree angle. This will push grout into the spaces while squeezing it off the surface of the tile. Make sure the grout completely fills the grout lines and is even with the tile face.

  • After you've grouted one section, move on to the next while the grout sits for about a minute. After you've grouted the second section, go over the first with a damp sponge, wiping it flat against the surface to take up the excess grout on the tile face. Don't dig the grout out of the lines. After you've wiped it up, make sure the grout is still filling all the lines. If any has been pulled up, re-grout that part.

  • Continue grouting and wiping until the whole area has been grouted. Let it dry for an hour, then go over it again with a damp, well-wrung sponge to take up the grout haze on the tiles. Wipe it once or twice more over the next few hours, as needed. Allow the grout to set for two days before using the floor.

Tips & Warnings

  • Wear a particle mask when mixing and applying your grout.

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