How to Do Mosaic Backsplash


Installing a mosaic tile backsplash can add a beautiful, unique focal point to any kitchen. Mosaic tiles come in a variety of colors, shapes, and materials like glass, ceramic, porcelain, and natural stone. A mosaic backsplash made up of small tiles allows you to get creative with patterns and designs. While tiling a backsplash is not necessarily a beginner DIY project, it is manageable if you take the proper precautions and follow each step carefully. Here is a comprehensive guide on how to do mosaic backsplash in your kitchen.

What You’ll Need

Before starting any tiling project, it’s important to gather all the necessary materials and tools. Here is what you’ll need to complete a mosaic tile backsplash installation:

  • Mosaic tiles – Calculate the square footage of your backsplash area to determine how many tiles you’ll need. Leave a 10% overage.
  • Tile adhesive – Choose an adhesive compatible with your tile and substrate material.
  • Grout – Pick a grout color that complements your tile. Unsanded grout is best for mosaic sheets.
  • Trowel – Use a notched trowel to spread the tile adhesive.
  • Grout float – This tool helps apply grout into the tile joints.
  • Sponge – For wiping away excess grout.
  • Tile spacers – Spacers ensure consistent grout line spacing between tiles.
  • Tile cutter – Useful for custom cutting border tiles.
  • Safety gear – Gloves, goggles, knee pads, etc.

How to Do Mosaic Backsplash

Step 1: Prepare the Surface

It’s crucial to install tile over an even, water-resistant surface. Here’s how to prepare the backsplash area:

  • Remove any old backsplash and thoroughly clean the wall surface.
  • Inspect the wall for damage and repair any holes or flaws.
  • Apply painter’s tape along the edges to protect the surrounding walls.
  • Prime and seal the backsplash area with a waterproofing membrane.

Step 2: Plan Your Pattern and Layout

One of the fun parts of a mosaic backsplash is designing the tile layout. Here are some tips:

  • Sketch ideas on graph paper before committing to a pattern.
  • Lay the mosaic tiles on the floor to visualize how they fit together.
  • Mix multiple colored tiles to create interest.
  • Use the center of the wall as the focal point.
  • Consider a border along the edges of a more complex central design.

Step 3: Apply the Tile Adhesive

To adhere the mosaic tile sheets:

  • Spread a thin layer of adhesive on a small section of the wall using a notched trowel.
  • Follow the adhesive product instructions carefully.
  • Applying too much adhesive can cause the tiles to slide out of place.
  • Press the mosaic tile sheets gently but firmly into the adhesive.
  • Check periodically that the back of each tile is making consistent contact with the adhesive.
  • Continue working in small sections until the entire backsplash area is tiled.

Step 4: Allow Adhesive to Cure

It’s crucial to allow the tile adhesive to cure properly per the manufacturer’s directions before grouting. This prevents tiles from shifting out of place later on.

  • Allow the recommended timeframe for the adhesive to fully set.
  • Avoid walking on or cleaning freshly installed tiles during this time.
  • Check that all tiles are firmly attached before moving onto grouting.

Step 5: Apply Grout Between Tiles

Now it’s time to fill the joints between tiles with grout. Be sure to:

  • Apply grout float at a 45° angle and work it deeply into joints.
  • Allow grout to set just until hazy like a soft frost, 15-30 minutes.
  • Use a damp sponge to wipe away excess grout in a circular motion.
  • Rinse sponge frequently to prevent grout smears or film from building up on tiles.
  • Once all grout haze is removed, allow the joints to cure fully per grout instructions.

Step 6: Finish and Seal the Tiles

The final details complete your new backsplash installation:

  • Apply caulk along countertop/backsplash junctions and any perimeter edges.
  • After grout has cured fully, apply a penetrating sealer to protect the grout and tiles.
  • Buff surface gently with a soft, dry cloth.
  • Be sure to wait at least 48-72 hours before cleaning backsplash.
  • Stand back and admire your beautifully tiled mosaic backsplash!

How to Do Mosaic Backsplash: FAQ

Curious about some common questions and concerns when installing a mosaic tile backsplash? Here are some useful answers:

What substrate surfaces can mosaic tile be installed on?

Mosaics can be installed over cement board, drywall, plaster, plywood, and existing tile backsplashes as long as the surface is in good condition.

What are the best mosaic sheets to use for backsplashes?

Pre-spaced mosaic mesh-backed sheets are easiest since the tiles stay firmly in place. Glass, ceramic, or porcelain work well and are water-resistant.

How are mosaic sheets cut to fit?

Use a wet saw or tile cutter to custom cut borders and edges to fit your backsplash area. Make sure to account for the spacing between each tile.

Should the tiles be sealed before or after grouting?

Sealing is the last step after grouting and curing, to prevent the sealant from being removed from the tiles during cleaning. Use a penetrating sealer suitable for the tile material.

How long does a mosaic tile backsplash installation take?

Plan on mosaic backsplash installation being a 2-3 day process: day 1 for surface prep and applying tile adhesive, day 2 for grouting once adhesive has cured, day 3 for sealing and finishing.

What’s the best way to clean and care for mosaic backsplash tiles?

Use pH neutral gentle cleaner and soft cloth for routine cleaning. Reapply sealer annually. Avoid harsh cleaners or scrubbing that can damage the grout or tiles. Handle mosaic tiles gently.


Installing a mosaic tile backsplash is an intermediate DIY project that adds big visual impact. With careful planning, high-quality materials, proper prep work, and attention to detail throughout each step, you can achieve stunning results. A creatively designed mosaic backsplash can transform the look and feel of any kitchen.