How to Install Glass Mosaic Tile Backsplash in Kitchen

Installing a glass mosaic tile backsplash is a great way to add visual interest and style to your kitchen. With careful planning and preparation, you can create a stunning backsplash that will transform the look of your kitchen. Here is a step-by-step guide on how to install a glass mosaic tile backsplash in your kitchen.

Selecting the Glass Mosaic Tiles

The first step is choosing the right type of glass mosaic tiles for your backsplash. Here are some tips on selecting glass mosaic tiles:

Consider the Color and Pattern

Glass mosaic tiles come in a huge range of colors, shapes, and patterns. Select tiles that coordinate well with your existing kitchen decor and colors. You can match the tiles to your countertop, cabinets, or flooring. Or make the backsplash a focal point by choosing an accent color that pops against neutral cabinetry.

Some popular options are:

  • Solid colors like aqua, seafoam or navy blue for a bold backsplash
  • Metallic glass tiles in gold, silver or copper for glamour
  • Multi-colored tile mosaics for a playful vibe
  • Subway-shaped rectangular tiles in white or neutral for a classic look

Types of Glass Mosaic Tiles

There are a few main types of glass mosaic tiles to choose from:

  • Smalti – These are handmade colored glass tiles. They have a beautiful shimmering effect but are on the more expensive side.
  • Penny Tiles – Small round mosaic tiles resembling pennies. These affordable tiles create a funky retro look.
  • Subway Tiles – Rectangular glass tiles that resemble classic ceramic subway tiles. Great for contemporary kitchens.
  • Stone and Glass Blends – These combine glass mosaic with stone like travertine or marble. The natural patterns of stone paired with glass create a striking effect.

Consider Durability

Not all glass tiles are equally durable. Check the product details to see if the tiles can withstand heat and moisture. Stone and glass blends tend to be most resilient.

Determine Tile Size

Smaller 1×1 inch mosaic tiles create a fine detailed pattern. Larger subway-style tiles make less impact but are easier to install. Consider the look you want and your DIY skills when selecting tile size.

Purchase Extra Tiles

It’s always wise to purchase 10-15% extra glass mosaic tiles than you estimate you’ll need. This allows for mistakes, cuts, and future repairs. Keep extra tiles handy after installation.

Prepare the Surface

Take time to properly prepare the installation surface for best results.

Clean the Backsplash Area

Thoroughly clean the backsplash area and remove any old caulk, sealant, grease, or grime. Clean off dust using a vacuum. Fill any holes or imperfections with spackle.

Remove Appliances and Obstructions

Uninstall any appliances, lighting fixtures, or other items that obstruct backsplash access. Move away items like countertop appliances to give yourself room.

Sand Down Any Rough Areas

Use 120-150 grit sandpaper to sand down any bumps, imperfections, or rough painter’s tape lines on the wall surface. This helps level the surface.

Seal and Prime the Surface

Apply painter’s tape around the edges. Then apply a thin coat of masonry sealer using a paint roller or brush. Let it dry completely. Next, use a primer coat like KILZ to improve mosaic adhesion.

Planning the Layout

Carefully mapping out the backsplash design is crucial for an organized look.

Map the Tile Layout

Sketch out a basic plan for the tile layout. Mark the tile starting point, ending point, and any focal areas like behind sinks or ranges. Calculate the number of tile rows.

Determine Tile Orientation

Decide if you want the tile pattern to run horizontally or vertically. This orientation impacts the visual effect. Mixing directions can add interest.

Check for Alignment

Use a level to determine if the tiles will be installed in line with surrounding tiles and cabinets. Adjust the layout to keep everything aligned.

Account for Outlets and Fixtures

Note any electrical outlets, plumbing fixtures, lights etc that the tiles must accommodate. Adjust tile spacing as needed to allow for these.

Order Tiles

Finally, use your measurements and tile calculations to order enough mosaic tile sheets, plus extras as mentioned earlier. Acclimate tiles to room temperature before installing.

Tools and Materials Needed

Assembling the right tools and supplies will ensure the installation goes smoothly.

Tiling Tools

  • Tile cutter for straight cuts
  • Nippers for irregular cuts
  • Tile spacers and levels
  • Rubber grout float for spreading grout
  • Grout sealer
  • Trowels for mixing and spreading mortar
  • Buckets for mixing mortar
  • Tile adhesive tape

Safety Gear

  • Safety goggles and gloves
  • Knee pads
  • Dust mask
  • Ear protection if using a wet saw


  • Glass mosaic tile sheets
  • Thinset mortar adhesive
  • Grout
  • Caulk
  • Painters tape

Installing the Tile Backsplash

Now you’re ready for the fun part – installing the tile! Follow these steps:

Mix the Mortar

Mix up a batch of thinset mortar adhesive as specified on the package directions. Only mix up what you can use in 30 minutes.

Apply Mortar to the Wall

Use a notched trowel to apply a thin layer of mortar adhesive onto about one square foot of the wall at a time.

Press on Tiles

Press the mosaic tile sheets firmly into the mortar, using spacers to leave even 1/16″ grout lines. Push out any air pockets.

Continue in Sections

Work in square foot sections, applying mortar and installing tiles row by row until complete. Let tiles set 24 hours.

Cut Tiles as Needed

Use a wet saw or nippers to cut tiles to fit around outlets, edges, and other obstructions. File edges smooth.

Apply Grout

Mix grout and apply it over the tiles using a rubber grout float. Push it into joints and let sit 10 minutes before wiping clean.

Seal and Finish

Once grout has dried 24 hours, apply grout sealer. Allow tiles to cure 48 hours before normal use. Finally, caulk edges. Enjoy your new backsplash!

Tips for Installation Success

Follow these tips to ensure your glass mosaic tile backsplash installation goes as smoothly as possible:

  • Work in small sections for easiest application and to prevent mortar from drying out.
  • Apply consistent pressure so tiles adhere evenly to the wall without pops or cracks.
  • Keep extra tile sheets handy to swap out any tiles that crack or chip during installation.
  • Plan start and end points carefully before mixing mortar so you can work efficiently.
  • Wipe away excess grout and haziness from tile surface before it dries for easiest cleanup.
  • Don’t walk on tiles immediately – allow 48 hours for mortar and grout to fully cure before regular use.

Common Problems and Solutions

Even experienced DIYers can run into trouble at times. Here are some common glass mosaic tile problems and how to fix them:

Tiles Falling Off

  • Issue: Tiles detach from the wall surface and fall off. This is often caused by inadequate mortar coverage, not pressing tiles firmly into place, or a rough under-surface.
  • Solution: Carefully remove loose tiles and scrape off old mortar. Re-smooth the surface, reapply mortar, and reinstall tiles, pressing them firmly so they adhere properly.

Cracked Tiles

  • Issue: Tiles develop cracks either during installation or afterwards. Excess mortar under tiles can cause cracking from pressure.
  • Solution: Carefully swap out any cracked tiles during install for new ones before the mortar dries. For later cracks, use a grout removal tool to gently pry up cracked tiles and replace with new ones, re-grouting as needed.

Grout Cracks

  • Issue: Hairline cracks appear in the grout between tiles, allowing moisture to seep in. Poor grouting or normal wear over time can cause cracking.
  • Solution: Re-grout any cracked areas, allowing time to cure. Apply grout sealer which helps protect grout from cracking and moisture damage. Re-apply sealer periodically.

Discolored Grout

  • Issue: Grout appears stained or unevenly colored in spots. Dirt, grime, or moisture can discolor grout over time.
  • Solution: Use a specialized grout cleaner to deep clean and whiten discolored grout lines. Rinse thoroughly and allow to dry fully. Re-seal grout once dry to help prevent future staining.


How long does a glass mosaic tile backsplash installation take?

For an average sized kitchen backsplash of 20-30 square feet, expect the tile installation to take 2-3 days from start to finish. Allow extra time if it’s your first time tiling. Proper planning, patience during installation, and allowing materials to cure fully all help ensure success.

Does a backsplash have to go all the way to the ceiling?

While many backsplashes do extend all the way to the ceiling, it’s not an absolute necessity. The backsplash can stop partway up the wall depending on your preference and the tiling layout. Extending to the ceiling gives a seamless look and fully protects the wall from splashes and drips.

Should I seal glass mosaic tiles?

It’s highly recommended to seal your glass mosaic tiles and grout after installation. Sealing the tiles provides an added layer of protection from moisture damage, while grout sealer helps prevent staining and cracking. Use specialty tile and grout sealers made for glass mosaics. Reapply sealer on grout yearly.

Can you use glass mosaic tiles on shower walls?

Yes, glass mosaic tiles can make a beautiful backsplash for shower walls, providing they are the right kind of tile. Ensure any glass mosaics in the shower are porcelain or ceramic with a waterproof backing, as regular mosaic sheets may allow water to penetrate. Porcelain mosaics create a stunning shower accent wall.

Can you put glass tiles in a kitchen backsplash?

Definitely! Glass mosaic tiles are one of the most popular and versatile choices for kitchen backsplashes. Glass tiles provide a shiny, smooth surface that’s an excellent choice behind sinks and ranges. Use heat-resistant glass tiles near cooking areas. Glass mosaics come in endless color, shape and pattern options to perfectly suit your kitchen’s décor.


Installing a glass mosaic tile backsplash is an achievable DIY project that can completely transform the look of your kitchen. With proper planning, careful surface preparation, precision tile cutting, and ample drying time for adhesives and grout, you can get professional-looking results. The finished project will upgrade your space with a colorful, shiny focal point full of visual interest.

Arm yourself with the right tools, materials, safety gear, and plenty of patience. Work methodically in small sections to apply mortar, lay tiles, and grout carefully. Before you know it, you’ll have a stunning new glass mosaic backsplash that elevates your kitchen’s style and protects the walls.