How to Grout Glass Tile Backsplash

Installing a glass tile backsplash can transform the look of your kitchen or bathroom. The shining glass tiles create a stunning focal point. However, proper grouting technique is crucial for creating clean grout lines that allow the beauty of the tile to shine through. Follow this guide for tips on how to grout glass tile backsplash.

Select the Right Grout

Choosing the right grout for glass tile is critical. You’ll want to use an unsanded grout. Sanded grouts contain particles that can scratch the smooth surface of glass tiles.

Unsanded grouts are ideal for glass tiles with narrow grout lines 1/8″ or smaller. They create a neat, uniform appearance. White unsanded grout provides a clean look that allows the glass tile to sparkle.

For wider grout lines, you may need a nano-polymer modified grout. The polymers allow it to stay flexible and resistant to cracking. Make sure to use a grout specifically designed for glass.

Avoid any grout with dyes or pigments, which can transfer color onto the tile surface. Stick to pure white for the cleanest look.

Prepare the Surface

Before grouting, ensure the tiles are firmly adhered to the surface. Press on tiles and replace any that are loose.

Clean the tile surface with a damp sponge to remove any dirt, grease, or residue. This prevents contaminants from staining the grout. Rinse thoroughly and allow to dry completely.

Apply grout release or sealer to the tiles as an added precaution. This creates a protective barrier so grout won’t stick to the surface. Apply evenly and wipe off any excess.

Mix and Apply Grout

Mix the grout according to package directions. Unsanded grout powder is mixed with cool, clean water. Only mix up as much as you can use within 30 minutes.

Hold the grout float at a 45° angle and force grout diagonally into the joints with a firm, scraping motion. Make sure joints are completely packed, leaving no gaps or voids.

After 10-15 minutes of drying, use a damp sponge to wipe diagonal across the tiles to smooth and shape joints. Rinse the sponge frequently.

Avoid wiping in a circular motion as this can pull grout out of the joints. Don’t overwash the tiles. Clean water and a light touch are key.

Final Cleanup

Once grout in the joints becomes firm, about 1-2 hours after application, do a final clean up.

Wet a sponge with a vinegar-water solution (1 cup vinegar per gallon of water). Wring out tightly and wipe tiles to remove any remaining grout haze.

Rinse with a sponge dampened with clean water. Wipe off any remaining moisture with a soft cloth. Avoid abrasive scrubbing.

Inspect the joints for any low spots and re-apply grout as needed. Allow the grout to cure fully, typically 24-48 hours. Avoid getting the grout wet during this time.

Grout Maintenance

Grout between glass tiles requires some periodic maintenance to keep the joints looking pristine.

  • Re-seal the grout every 1-2 years with a penetrating grout sealer. This prevents stains from setting in the porous grout.
  • Clean grout regularly with a soft brush and gentle cleaner. Avoid harsh chemicals or scrubbing.
  • Watch for any cracks in the grout and re-apply new grout as needed to prevent damage.

Tips for Success

Follow these tips for best results when grouting glass tile:

  • Take your time and don’t rush the job. Patiently packing the joints and smoothing is key.
  • Work in small sections of 2-3 square feet. This makes grouting and clean up easier.
  • Avoid getting excess grout on the tile surface. Wipe off immediately if you do.
  • Be consistent in your motions, either wiping diagonally or side-to-side within each area.
  • Work in adequate ventilation and watch for drying time of the grout.
  • Clean tools right away for easier cleanup.

Common Questions

What’s the best grout color for glass tile?

Pure white unsanded grout has the cleanest look that allows the glass tile to sparkle and shine. Avoid any grouts with pigments or dyes.

Should I seal the grout after installation?

Yes, applying a penetrating grout sealer after installation is highly recommended. The sealer prevents stains from setting into the pores of the grout. Re-apply sealer every 1-2 years.

How soon can I get the grout wet after application?

Avoid getting the grout wet for at least 24-48 hours after installation. This allows the grout to fully cure and prevent soft or cracked joints.

What’s the easiest way to remove haze from glass tiles?

Mix 1 cup of white vinegar per gallon of water. Dampen a sponge in this solution and gently wipe tiles to remove residual grout haze or film. Rinse thoroughly.

How do I fix a crack in the grout between glass tiles?

Carefully scrape out the old grout with a special grout removal tool, taking care not to scratch tiles. Clean well and let dry completely. Re-apply fresh grout, allow to dry, then seal.


Grouting glass tile backsplash requires the right products, techniques, and maintenance to keep the grout looking pristine. Choosing white, unsanded grout, sealing the tiles, fully packing joints, gentle cleaning, and re-applying sealer periodically will help maintain the beauty of the glass tile installation. Pay close attention to the details, work patiently, and you can achieve stunning results. A properly grouted glass tile backsplash will bring eye-catching sparkle and charm to your space.