What Do I Need to Install Glass Tile Backsplash

Installing a glass tile backsplash can add a beautiful, durable, and easy-to-clean focal point to any kitchen or bathroom. With proper planning and preparation, even DIYers can achieve stunning results with glass tile. This comprehensive guide will walk you through everything you need to know to successfully install a glass tile backsplash.

Planning Your Glass Tile Backsplash

Before purchasing materials and starting your installation, take time to plan out your backsplash design. Here are some important factors to consider:

Selecting Glass Tiles

Glass tile comes in a huge array of colors, styles, and finishes. Spend time looking at design inspiration photos to decide what kind of look you want. Some popular options include:

  • Subway tile style – Rectangular glass tiles in white or bold colors for a classic look
  • Mosaic tiles – Tiny glass tiles that form patterns when installed
  • Large format tiles – Big, statement-making glass tiles to create a contemporary feel
  • Metallic tiles – Glass tiles with gold, silver, copper or other metal finishes for glam
  • Iridescent tiles – Tiles that shine in rainbow colors when lit

Consider the overall style of your kitchen or bath when selecting glass tile. For modern spaces, large rectangles or mosaics in grey and white are popular. Traditional rooms can benefit from subway tiles or mosaics with some color.

Make sure to purchase a few extra tiles to account for breakage or the need to cut tiles to fit.

Determine Placement

Decide the exact area your new backsplash will cover. It can be installed directly behind a cooktop, range, or sink. Backsplashes typically extend 4-6” up the wall from countertops or vanities. For a coordinated look, glass tile can also wrap around edges onto sidewalls.

Measure the surface area needing tile coverage and sketch out plans for the tile layout. Having these measurements will help you purchase the right quantity of tile.

Select Grout Color

The color of grout lines will impact the overall look of your backsplash. With glass tile, white and light grey grouts are popular choices. They add definition without distracting from the sparkle of the glass.

Alternatively, choosing a darker grout color that matches the tile can create a seamless look. Sample boards showing grout options with the glass tile can be helpful for visualizing the final design.

Consider Accent Tiles

To add extra personality, you can incorporate contrasting accent tiles into your design. Multicolored mosaic tiles, metallic strips, or tiles with etched patterns are commonly used to create borders, geometric shapes, or other special details.

Sketch out ideas for how you might use accent tiles before finalizing plans. Be sure to purchase enough to complete your design.

Tools and Materials Needed

Glass tile installation requires some specialized tools and materials. Here is a checklist of everything you’ll need:


  • Glass tile sheets or mosaics
  • Accent tiles (if using)
  • Extra tiles of each type to allow for cuts and breakage

Adhesives and Grout

  • Thinset mortar modified for glass tile
  • Grout formulated for joints 1/8” or smaller
  • Grout sealer


  • Tile spacers
  • Tile cutter (manual, snap, or wet saw)
  • Grout float
  • Grout sponge
  • Mixing buckets
  • Notched trowel suitable for glass tile
  • Rubber grout float
  • Grout sealer applicator (brushes or sponges)

Other Supplies

  • Painter’s tape
  • Dust masks
  • Work gloves
  • Safety glasses
  • Drop cloths
  • Rags
  • Buckets
  • Grout clean-up sponge

Substrate Preparation Materials

  • Backerboard (cement, fiber-cement, or fiberglass-faced)
  • Thinset mortar for backerboard
  • Screws for backerboard
  • Joint tape for seams
  • Flat edge trowel for embedding tape

How to Prepare Walls for Installation

The substrate underneath glass tile must be smooth, dry, clean, and structurally sound. Most often, glass tile backsplashes are installed over backerboard rather than directly to drywall. Here are the steps for proper wall preparation:

Step 1: Remove Obstructions

Take down any items already on the wall like switch plates, existing backsplash tile, or wall-mounted pots and pans. Fill any holes or imperfections with spackle and sand smooth.

Step 2: Deep Clean

Wash the wall thoroughly with an all-purpose cleaner to remove grease, soap scum, and dirt. Rinse and let dry completely.

Step 3: Apply Backerboard

Cut cement, fiber-cement, or fiberglass-faced backerboard to fit your space. Screw it into wall studs every 8-12 inches using proper screws. Avoid over-driving screws so the board remains flat.

Step 4: Tape Seams

Cover all seams between backerboard sheets with 2” wide alkali-resistant mesh tape. Embed the tape in a layer of thinset mortar. Allow to dry per thinset manufacturer instructions before applying tile.

The wall is now prepped and ready for glass tile once the thinset dries!

How to Cut Glass Tile

Glass tile requires specialized cutting tools and techniques to produce clean edges that won’t look ragged or compromised. Here are the best practices for cutting glass tile:

Manual Tile Cutter

A manual tile cutter with a diamond carbide wheel can make straight score cuts in glass tile. Place tile face up, align the cutter guide at the right measurement, and press down firmly while running the cutter across. Snap the tile upwards along the scored line.

Wet Tile Saw

For intricate cuts, curvy shapes, or notches, a wet tile saw is ideal. The water prevents overheating and cools the diamond tile blade. Work slowly and steadily to make smooth cuts. Practice first on scrap tile.


Tile nippers can snap off small uneven edges or bumps left behind after cutting. They can also trim tile directly against walls or for fitting around outlets. Don’t nip too much tile at once to avoid cracks.

Place a towel under the tile when using nippers to prevent chips. Always wear safety glasses when cutting tile. Make cuts before installing for easiest results.

How to Drill Holes in Glass Tile

Some tile installations will require drilling holes for plumbing fixtures, outlet covers, towel bars, and other penetrations. Here are tips for drilling glass tile successfully:

Use a Ceramic Drill Bit

Special diamond-encrusted drill bits designed for glass and tile work best. Apply light pressure and let the bit do the work. Lubricating the bit with water will help control friction and temperature.

Go Slow

Drill on the lowest speed setting. High speeds can cause the diamond bit to overheat and damage the tile. Take your time and use a steady drilling pace. Back the bit out periodically to clear debris.

Add Back Support

Place the tile on a piece of scrap wood or plastic when drilling to prevent cracking or shattering on the back side. Keep fingers safely away from drill entry point.

Reduce Vibration

Vibration while drilling can lead to messy edges or cracks. Try drilling on a solid surface rather than up on a ladder. You can also apply tape around the hole location to reduce vibration.

With care and the right drill bits, holes for plumbing and other penetrations can be made cleanly and precisely.

How to Install a Glass Tile Backsplash

Once planning is complete and you have all the necessary materials, it’s time for the fun part – installing the tile! Follow these key steps for proper installation:

Step 1: Prepare Tile

Glass tile may have a protective film coating that needs removal prior to installing. Check manufacturer instructions and remove any coverings. Arrange your tiles and do any needed cutting beforehand.

Step 2: Apply Thinset

Use a notched trowel to apply a layer of thinset mortar suitable for glass tile to the wall area where tile will be applied. Only spread thinset over sections where tile will be set immediately while the thinset is still tacky.

Step 3: Set Tiles

Press tiles into the thinset beginning in the center and working outwards. Use tile spacers between each tile to achieve even grout joint spacing. Gently push tiles forward and back to collapse air pockets behind them.

Step 4: Finish Initial Placement

Once the central area is fully tiled, complete tile placement in the remaining areas. Remove spacers and fill any gaps in the tile coverage. Allow thinset to cure per manufacturer directions.

Step 5: Grout Tile

Use grout float to spread grout over the tile surface, pressing it firmly into joints. Holding float at a 45° angle works best. Let grout sit briefly before wiping away excess with minimal pressure.

Step 6: Clean Tile Surface

Once grout has time to cure per product directions, use a soft sponge to gently polish and clean grout haze off the remaining tile surface. Buff tiles completely clean for maximum shine.

Step 7: Seal Grout

After allowing grout to fully cure, apply grout sealer according to label directions to protect joints and prevent staining. Reapply sealer on a regular basis for longevity.

Tips for Achieving a Flawless Look

With small glass tiles, achieving a cohesive and consistent overall appearance relies heavily on proper installation technique. Keep these tips in mind:

  • Maintain even spacing and alignment as you install tiles to avoid a crooked or uneven look.
  • Keep your working area and tools clean to minimize grout haze which can detract from glass tile’s sparkle.
  • Take extra time applying grout carefully into the joints without smearing onto tile faces.
  • Be gentle yet thorough when buffing off grout haze once cured to reveal the tiles’ true brilliance.
  • Use soft cloths only when wiping tiles clean after grouting to prevent scratches or swirl marks.
  • Work patiently and methodically for best results. Glass tile can be unforgiving of mistakes.

Grout Considerations for Glass Tile

Choosing and applying grout properly helps ensure a flawless finished look in a glass tile installation. Here are some key factors to keep in mind:

Grout Width

Glass tile typically has quite narrow grout joint widths, often just 1/16” or 1/8”. Be sure to use a grout engineered for these thin spaces and apply carefully to fully fill joints.

Grout Formula

Epoxy grouts offer the most durable stain and water resistance. However, they can be tricky for DIYers to apply. Urethane or polymer modified cement grouts are easier to use and still provide good protection.

Contrasting Grout

Black or dark grey grout paired with glass tile can look modern and stylish. But it shows every imperfection. Precision grouting is crucial for flawless finished results.

Matching Grout

Grout that matches or blends with the tile color hides small grouting imperfections well. Easier for DIY, but can look more matte and subdued.

Timing Grout Cleanup

Wipe away excess grout once it becomes firm, typically 10-20 minutes after applying. Waiting too long increases grout haze that can etch glass tile.

Sealing Grout

Adding a protective sealer to fully cured grout makes it repel stains. Reapply sealer regularly per product directions to maintain performance.

Common Problems and Solutions

Even experienced tilers can encounter issues on some glass tile installations. Here are some frequent problems and how to prevent or resolve them:

Uneven Grout Lines

Solution: Be vigilant about using high-quality tile spacers for consistent spacing as you set tiles. Check for level and plumb as you work.

Grout Haze

Solution: Wipe tiles gently with minimal pressure during initial grout cleanup. For stubborn haze, use a specialized grout haze remover product after full cure instead of excessive scrubbing.

Dull Finish

Solution: Avoid cleaning tile with harsh chemicals or abrasive pads/tools. Use soft cloths only. Reapply grout sealer regularly to protect finish.

Cracked Tiles

Solution: Handle glass tile gently. Use right tools and techniques for cutting to avoid stress fractures. Nip off small bumps; don’t over-cut.

Grout Cracks

Solution: Ensure proper grout for narrow joints is used. Some epoxy grouts stay slightly flexible when cured to prevent cracking.

Grout Washout

Solution: Let grout cure fully before exposure to moisture. Use sealing products to maximize water repellency. Re-apply sealer regularly.

FAQs About Installing Glass Tile Backsplash

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

Use a white thinset mortar formulated for glass and mosaic tile. It will provide the adhesive strength needed and resist staining or bleed-through.

Can you install glass tile over existing backsplash?

It’s not recommended. Removing the old backsplash allows you to inspect and prep the wall properly. Installing over old tile risks adhesion issues down the road.

What color grout looks best with glass tile?

White or light grey grouts enhance glass tile’s sparkle. Black or darker grout hides flaws well but requires meticulous installation. Matching grout blends in for a seamless look.

How do you cut holes in glass tile for outlets?

Mark the exact location and use a tile nipper to nibble out small pieces steadily. Or use a diamond hole saw bit on a drill, keeping water running over the area as you drill.

Should glass tile backsplash go all the way to ceiling?

Not necessarily. While glass tile can extend all the way up, stopping it 4-6 inches above counters keeps the focus at eye level without overdoing it.

Can you install glass tile on shower walls?

Yes, glass tile can be used on shower walls if proper waterproofing like a membrane or backerboard is installed behind it. Epoxy grout provides the most water resistance.

How far back should a backsplash extend?

Standard backsplash height is 4-6 inches above counter or vanity tops. Full height backsplashes that extend from countertop to ceiling are also popular. Depth depends on your design.

Enhance Your Space with Stunning Glass Tile

Installing a glass tile backsplash is an achievable DIY project with proper planning, patience, and care. The dazzling, durable, and easy-to-maintain finish will transform walls into a work of art. Use this comprehensive guide to gain confidence in installing glass tile successfully from start to finish. Let your design vision shine and enhance your kitchen or bath with the beauty of glass tile accent walls.