man grouting the joints of the installed glass mosaic backsplash
Photo: Kolin Smith

Step 17: Grout the Joints

Stir the premixed urethane grout gently but thoroughly until its texture is uniform. (We used a drill/driver fitted with a paint-mixing bit, at a slow speed.) Let it sit for a few minutes, until any air bubbles have dissipated. Working on one small section at a time, wipe the tile with a wet sponge until the surface is slick. Apply grout using an epoxy grout float, pulling it horizontally and vertically over the tile to work it into the joints. Once the joints are packed, pull the float diagonally across the tile to remove excess from the tile faces, then mold the joints to eliminate high points by wiping the tile in a circular motion with a wet sponge. Remove traces of grout from the surface by lightly wiping a clean, damp sponge diagonally across the tile. Repeat, section by section, for the entire wall.
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    Tools List

    • drill
    • notched trowel
      trowel with 3/16-by-¼-inch V-notch
    • utility knife
      utility knife
    • hammer
    • Glass Nippers
      two-wheeled glass nippers
    • rubber float
      epoxy grout float
    • drywall bucket
      5-gallon flat-bottomed mud bucket
    • bucket with sponge
      small bucket
    • grout sponge
      grout sponge
    • scrub brush
      nylon scrub brush
    • caulk gun
      caulk gun

    Shopping List

    Paper-faced translucent glass mosaic sheet tile. The facing is peeled off once the tiles are set on the wall

    Kraft paper to protect your counters

    Painter's tape

    Scrap 1x lumber for a temporary ledger

    1½-inch drywall screws

    80-grit sanding sponge for roughing painted drywallSealer-primer paint

    Thinset mortar. Choose a quality white latex-fortified portland cement thinset.

    Scrap cardboard to use as a spacer

    Grout Make sure it's a flexible grout approved by the tile maker. We chose a colorized, premixed urethane water-based grout that "gives" when the glass expands and requires no sealant

    Acrylic caulk that matches the grout