How to Set Glass Tile Backsplash

Glass tile can make for an incredibly beautiful and unique backsplash in any kitchen. With its translucence and endless color variations, glass tile brings a glittering, jewel-like quality wherever it’s installed. Setting glass tile, however, requires some special considerations. Glass is more fragile than ceramic or stone tile, and its installation process has a few extra steps. With proper planning, careful tile-setting techniques, and the right materials, a stunning glass tile backsplash is easy to achieve.

Selecting Glass Tiles

The first step in any tile project is choosing the right tile. With glass tile, you’ll want to think about:

Tile Shape and Size

Glass tile comes in a variety of shapes, sizes, and textures. Smaller mosaic tiles (1 x 1 inch or smaller) create busy, intricate patterns. Larger tiles (4 x 4 inches or bigger) make a bolder statement. Tile thickness can range from 1/4 inch to 3/8 inch. Thicker tiles are more durable.

Consider the look you want to achieve and the scale of your space. Smaller tiles suit smaller spaces, while larger tiles make a better choice for a expansive backsplashes.

Iridescence and Color Effects

The translucent quality of glass tile allows it to pick up colors and patterns from its surroundings. Iridescent glass tiles shift color depending on the lighting conditions. Many glass tiles are backed with metallic colors or textures, adding further interest.

Decide whether you want an overall uniform color effect or a more playful iridescent look. Your lighting conditions will also affect the final look.


Glass tile is more prone to cracking and chipping than ceramic or porcelain. Opt for thicker, machine-cut tiles rather than hand-cut for better durability. Smoother finishes hold up better than rough, porous finishes.

Larger tiles are less likely to suffer damaged corners and edges than small mosaic tiles. Consider minimum 3/8 inch thickness for glass floor tile or any tile likely to endure impacts.


Glass tile ranges widely in price depending on the type of glass, intricacy of patterns, finish, thickness, and overall quality. Hand-cut art glass tile is generally the most expensive. Machine-cut metallic-coated and iridescent tiles are moderately priced. Clear satin glass tiles are usually the most budget friendly.

Set your budget before falling in love with any one look!

Selecting Setting Materials

Choosing the right setting materials for glass tile ensures a durable finished product. Consider the following:


Use a premium-grade, polymer-modified thinset mortar suitable for glass. Latex-modified mortar is more flexible and has better adhesion. Check that the mortar can be used for the tile size you’ve selected.

Avoid regular mortars, mastic adhesives, and mortar with cure accelerators, which can react with the chemical composition of glass tile.

White mortar is required for glass tile to show true colors.


Choose an epoxy-based grout, or a polymer-modified sanded grout, both of which are less likely to scratch glass tile surfaces. Match the grout color to the tile for a seamless look. Stay away from dark grout with glass tile, which tends to look dirty over time.


Use a flexible, waterproof silicone sealant designed for wet areas. Match it to the grout color. Avoid acrylic sealants.

Preparing Your Work Surface

Preparing the work surface properly will keep the glass tile securely adhered over time.


Thoroughly clean the installation area, removing any existing wall covering, loose paint or tile, grease, and soap residues. Rinse the surface well.

Glass tile will not adhere to surfaces treated with sealer, wax or oil. Use a degreaser and sand or grind these surfaces if necessary to remove prior coatings.


Mark the tile layout on the wall surface with a level and measuring tape. Glass often uses irregular hand-cut shapes as accents within a grid, so laying out the pattern first ensures you won’t be surprised!

Use a laser level to draw perfectly horizontal guideline across the entire installation area. These keep tile courses straight as the work progresses up the wall.

Substrate Prep

Install cement backerboard if the wall surface material is unsuitable for tile. Paint on a tile-bonding primer if the surface is very slick.

Roughen high-gloss surfaces with sandpaper. Concrete and plaster can be etched with an acid solution.

Fill any divots and smooth over textured surfaces using a patching compound to even out the area.

Setting the Tile

With all your materials prepped and your surface ready, it’s time for the fun part – setting the tile!

Applying Mortar

Mix the latex-modified thinset mortar according to package directions. Avoid air pockets for optimal strength.

Use a notched trowel to spread a layer of mortar over one small section of the prepared surface at a time. Position the trowel at a 45° angle and use enough pressure to scrape the mortar ridges flush with the trowel surface.

Setting the Tiles

Arrange the glass tile pieces face up on a flat surface in their installation order.

Apply a 3/8 inch bead of mastic adhesive around the border of each tile.

Place the tiles one at a time into the mortar. Use a slight twisting motion to work them into the ridges, then use light pressure slide them into their final position.

Use plastic spacers between tiles to maintain even grout line widths.

Check tiles periodically with a level to ensure they remain in plane. Adjust and re-adhere if needed.

Allow the mortar to cure 24-48 hours before grouting.


Use masking tape to protect surfaces you don’t want grout smeared on.

Apply epoxy grout with a rubber grout float, packing it deeply into the tile joints with a sweeping motion.

Keep grouting in small, manageable sections of about 25 square feet. Use the least amount of water possible when cleaning to avoid discoloring the grout.

Wipe diagonally across tiles with a damp sponge to remove excess grout before it dries. Rinse the sponge frequently.

Let the grout cure fully (generally 3 days), then polish and seal it with a penetrating grout sealer.


Once grouting is complete, use a small foam brush to apply a bead of flexible silicone caulk around the perimeter and corners of the installation. This waterproofs the edges.

Use a grout sealing sponge to smooth and shape the caulk. Allow it to cure for the recommended time before exposing it to moisture.

Caring for Your Glass Tile

Glass tile brings sparkling elegance to any space when properly maintained. Follow these care tips to keep it looking its best:

  • Use a gentle cleaner designed for glass and tile. Avoid harsh cleaners, acids, abrasives.
  • Blot spills promptly with a soft cloth to prevent staining.
  • Re-seal grout annually to prevent buildup and mildew.
  • Handle broken tiles carefully and replace immediately to avoid damage to surrounding tiles.
  • Use extreme care with any razor blades when removing adhesives near glass tile.

With the right prep and care, a glass tile backsplash provides a gorgeous focal point in the kitchen for years to come! The dazzling translucence of glass elevates any design. Just take your time and use care during installation to handle the extra delicacy of glass. The results will be well worth the effort for an eye-catching backsplash you’ll love enjoying every day.

Common Questions about Setting Glass Tile Backsplash

Setting a glass tile backsplash in your kitchen can seem daunting if you’ve never worked with this beautiful but delicate material before. Here are answers to some frequently asked questions:

Is glass tile more difficult to install than ceramic tile?

Glass tile does require some extra precautions. The tile itself can crack and chip more easily if you aren’t careful during cutting and handling. The installation process also has more steps when it comes to prep work and sealants. Overall though, installing glass tile just takes more patience and care, not necessarily more skill, than ceramic or porcelain tile.

What tools do I need for cutting glass mosaic tile sheets?

You can cut mosaic sheets most cleanly with a wet saw fitted with a diamond glass blade. Nippers can also be used for smaller detailed cuts. Use a grinder to smooth any rough edges after cutting. Remember to wear protective goggles when cutting to avoid eye injuries.

Can I install glass tile over existing backsplash tile?

It’s best to remove old tile and start fresh with the proper substrate underneath for good adhesion. But glass can be installed over existing tile if the old tile is solidly attached and properly prepared with bonding agents. The finished glass tile surface may not be completely even and smooth though.

Should I use spacers between glass tile pieces?

Yes, plastic spacers are highly recommended to maintain even grout lines in your finished project. The transparency of glass tile can exaggerate any small inconsistencies in alignment or spacing, so taking the time to use spacers helps ensure a clean finished look.

What’s the best grout to use with glass tile?

Epoxy or urethane grout is ideal for glass. It resists scratching the smooth tile faces and its impervious surface makes it stain resistant as well. White epoxy grout enhances the color and brilliance of glass tile. Sanded grouts can also be used but require extra care cleaning to avoid scratching.

How long does it take for grout and caulk to fully cure?

Epoxy grouts take about 72 hours to fully harden and cure. Silicone caulks and sealants can take 24-48 hours to become water resistant, but may take up to 7 days to reach full strength and adhesion. Avoid heavy cleaning or moisture until everything has had time to properly set.

Should I seal my glass tile backsplash after grouting?

Sealing generally isn’t needed for glass tiles themselves, but it’s a good idea to seal the grout lines periodically to protect from stains and damage, especially for epoxy grouts. Use a penetrating sealer made for grout about once a year or as needed. Make sure to follow product directions carefully.


Installing a stunning glass tile backsplash is an achievable DIY project with careful planning, patience, and the right materials. While glass tile requires a few special considerations compared to ceramic or porcelain, the results are well worth the extra effort. The transparency and luminous colors of glass tile infuse kitchens and bathrooms with brilliant jewel-toned beauty. With some basic safety precautions for cutting, plus thorough prep and gentle care in handling the tile, you can execute an eye-catching backsplash sure to be admired. Take your time, embrace the process, and enjoy the sparkling results for years to come.