How to Install Mosaic Tile Backsplash in Kitchen

Installing a mosaic tile backsplash in your kitchen can add a beautiful, unique touch to your home. Mosaic tiles come in a variety of colors, shapes, and materials, allowing you to create a truly custom look. With some planning and preparation, installing a mosaic backsplash is a DIY project many homeowners can tackle. Here is a step-by-step guide on how to install mosaic tile backsplash in your kitchen.

Selecting the Mosaic Tiles

The first step is choosing the right mosaic tiles for your backsplash. Consider the following when making your selection:

Colors and Patterns

Mosaic tiles come in pre-made mesh sheets or mounted on boards. Look through tile samples to find colors and patterns that fit your kitchen’s aesthetic. Neutral colors like white, beige or gray can create a clean, elegant look. Bold colors or varied shapes make for an eclectic, artsy statement.


Mosaic tiles come in ceramic, porcelain, glass, and natural stone. Ceramic and porcelain are most common. Natural stone like marble or travertine can be pricier but has a luxurious look. Glass mosaic tiles add gleaming accents. Consider material durability and maintenance when choosing.

Tile Size

Smaller mosaic tiles from 1/4” to 3/4″ are typical. Smaller tiles allow for more detail and geometric patterns. Larger tiles create a more uniform look. The tile size can impact grout line spacing.


Look for mosaic sheets or tiles with unique accents like handmade ceramic tiles, mirrored tiles, or tiles made from recycled materials. These special touches can elevate the look of your backsplash.

Once you’ve selected the right mosaic tiles, order 10-15% extra to allow for cuts, waste and future repairs.

Preparing the Work Area

Installing the mosaic tile backsplash requires some preparation of the workspace.

  • Clear the counters and remove anything hanging on the walls where you’ll be tiling.
  • Protect nearby surfaces like countertops with rosin paper or drop cloths.
  • Have all your tools and materials organized and ready for use.
  • Turn off power to any outlets in the backsplash area.
  • Fill any holes or imperfections in the drywall with spackle and sand smooth.

Proper prep prevents problems down the line!

Tools and Materials Needed

Installing a mosaic tile backsplash requires some specialized tools and materials. Here’s what you’ll need:


  • Tile cutter for mosaic tile
  • Nippers for careful tile cutting
  • Grout float for spreading grout
  • Rubber grout float for grouting mosaic tiles
  • Spacers for consistent grout lines
  • Grout sealer
  • Tape measure
  • Level
  • Mixing bucket
  • Notched trowel
  • Rubber mallet
  • Utility knife
  • Adhesive remover


  • Mosaic tiles
  • Thinset mortar adhesive
  • Grout
  • Backerboard (if needed)
  • Polymer-modified thinset (for walls)
  • Caulk
  • painters tape

Installing the Backerboard

If your wall material is unsuitable for tile, you may need to install backerboard as a secure mounting surface.

Here’s how to install backerboard:

  • Remove existing wall surface material as needed.
  • Apply thinset mortar to the wall area.
  • Cut backerboard to fit the wall space.
  • Press boards onto the thinset and fasten with backerboard screws.
  • Tape seams with fiberglass mesh tape.
  • Skim coat over seams and screws with more thinset.

Allow thinset coats to fully cure before tiling.

Applying the Tile Adhesive

With your surface prepped, it’s time to start tiling! Follow these steps:

  • Plan your tile layout. Dry fit a few rows before installing to ensure fit.
  • Mix the thinset mortar adhesive per package directions.
  • Apply a thin layer of thinset to the wall area using a notched trowel. Apply only enough that can be tiled in 30 minutes.
  • Back-butter each tile sheet/board with additional thinset.
  • Press the tile sheets or boards onto the wall in your planned layout.
  • Use spacers between tiles for consistent grout line spacing.
  • Gently tap tiles with a rubber mallet to adhere.
  • Check tiles are level and fully adhered. Adjust as needed.
  • Allow thinset to cure fully (24-48 hours) before grouting.

Take care when applying thinset and setting tiles. Mosaic tiles don’t hide flaws well.

Grouting the Mosaic Tiles

Once the tile adhesive has cured, it’s time to grout. Follow these steps:

  • Mix the grout per package instructions to a thick, peanut butter consistency.
  • Apply grout over the tiles using a rubber grout float, pressing into joints.
  • Remove excess grout by holding float at 90° angle and scraping.
  • Wipe down tiles diagonally with a damp sponge to clean grout haze.
  • Rinse sponge frequently to keep it clean.
  • Allow grout to cure fully, then seal with grout sealer.

Take care not to pull tiles loose when cleaning excess grout. Change cleaning water frequently.

Finishing Touches

You’re in the home stretch! Finish your new backsplash with these steps:

  • Apply caulk along the edges and seams where the tile meets the countertop, sink, or appliances.
  • Allow caulk to dry fully per manufacturer’s directions.
  • Reinstall switch plates, outlets, soap dispensers and other removed items.
  • Thoroughly clean your new backsplash and admire your handiwork!

Your new mosaic tile backsplash adds personality and beauty to your kitchen. Follow proper tile care to keep it looking its best for years to come. Enjoy!

Frequently Asked Questions About Installing Mosaic Tile Backsplash

What kind of thinset should I use for a mosaic tile backsplash?

Use a polymer-modified thinset adhesive for a stronger bond on wall applications. This is an adhesive specifically formulated for tiles.

How long does thinset take to cure before grouting?

Thinset adhesive needs 24-48 hours to fully cure before grouting mosaic tiles. This allows the adhesive to reach its maximum strength.

Can I use sanded grout with mosaic tiles?

No, sanded grout should be avoided with mosaics. The fine sand can get trapped in the small grout lines and scratch the tiles. Use unsanded grout instead.

How do I apply grout properly on mosaic sheets?

Use a firm rubber grout float in circular motions to press grout evenly into the joints. Hold float at 90° angle to scrape excess grout off.

Should I seal the grout lines on my mosaic tile backsplash?

Yes, applying a grout sealer is highly recommended. Sealer prevents stains and makes grout cleaning easier. Reapply yearly.

How can I cut mosaic sheets and tiles?

Use a wet saw with a diamond blade or manual nippers. Nip individual tiles from sheet one row at a time as needed for fitting.


Installing a mosaic tile backsplash offers a simple way to add eye-catching style to your kitchen. With the right tools, materials, and techniques, this is a DIY-friendly project for many homeowners. Carefully following the preparation, tiling, and grouting steps will lead you to success and a stunning new focal point in your kitchen. Just take it slow and steady. The dazzling results will be well worth the effort!