How to Put Up Mosaic Tile Backsplash

Installing a mosaic tile backsplash can add a beautiful, custom look to any kitchen. Mosaic tiles come in endless colors, shapes, and materials, allowing you to create a truly unique backsplash. Putting up mosaic tile is a do-it-yourself project that can be completed in a weekend when you follow proper techniques. Here is a step-by-step guide on how to put up mosaic tile for a stunning backsplash.

Prepare the Surface

Before installing mosaic tile, you need to make sure you have a smooth, clean surface to apply the tiles.

  • Remove any existing backsplash and thoroughly clean the wall surface. Use a multipurpose cleaner to remove grease and soap residue.
  • Fill any holes or imperfections with spackle and let dry completely. Sand smooth.
  • Apply painter’s tape around the edges and any adjacent surfaces you want to protect.
  • Prime the surface with a tile primer or a coat of thin-set mortar to improve adhesion. Let dry completely.

Plan the Layout

  • Measure the backsplash area and sketch out a layout for the mosaic tile pattern. Plan for a balanced design.
  • Mix up loose tiles and arrange them on the floor to visualize placement and test layout options.
  • Cut mosaic sheets as needed to fit around outlets, windows, or edges using a wet saw or nipper tool.
  • Cut plain tiles for the edges and corners if not using bullnose tiles. The grid pattern of mosaics can be challenging for edges.

Prepare the Tiles & Materials

  • Organize mosaic tile sheets and gather materials – mortar, grout, spacers, tools, etc.
  • Mix the thin-set mortar according to package directions. Let it slake for 10 minutes.
  • Dampen the backsplash surface – don’t saturate, just lightly moisten.
  • Apply painter’s tape 1/8″ above the countertop to prevent thin-set drips.

Apply the Tile Adhesive

  • Use a notched trowel to spread a thin layer of thin-set mortar on the wall, about 1/4″ deep.
  • Spread only 1-2 square feet at a time so the mortar doesn’t dry out.
  • Use the flat side of the trowel to flatten ridges for maximum contact.
  • Press tiles into the mortar firmly to set, using spacers for consistent grout lines.
  • Work in sections and check levelness as you go using a spirit level.

Grouting the Tiles

  • Let the tiles set for 24 hours before grouting according to mortar specs.
  • Mix grout per package directions. Apply grout over the tiles using a rubber grout float.
  • Let it set slightly and then scrub diagonally to remove excess grout from the tile surface.
  • Clean any haze or film with a soft cloth once dry.
  • Cure the grout by keeping it damp for 48-72 hours.

Finishing Touches

  • Remove painter’s tape and spacers once grout has cured.
  • Seal grout lines with a penetrating grout sealer for protection.
  • Caulk perimeter edges with a flexible silicone caulk.
  • Clean the new backsplash well with a pH-neutral cleaner.
  • Stand back and admire your stunning, new mosaic tile backsplash!

Tips for Installing Mosaic Tile Backsplash

  • Stagger tiles so grout lines don’t align for a smoother overall look.
  • Start tiles in the center and work out toward edges.
  • Mix tiles from several sheets together to blend color variations.
  • Use paper-face mosaics to make installation much easier.
  • Consider a moisture-resistant backer board if installing near stove.
  • Opt for sanded caulk in wider grout lines vs. grout. Easier to apply.
  • Trim border tiles as needed for straight edges. Use bullnose on outside corners.

Frequently Asked Questions

What tools do I need to install mosaic tile?

You’ll need basic tiling tools – notched trowel, grout float, spacers, mixing paddle, buckets, wet saw or nippers, grout sealer, caulk gun, sponges, etc. A level and painter’s tape are also useful.

How do I cut mosaic sheets?

The best tool for cutting mosaic tile sheets is a wet saw with a diamond blade. You can also use manual nipper pliers for straight cuts. Score the paper backing before snapping the sheet.

What thinset mortar is best for mosaic tile?

Use a polymer-modified thinset mortar suitable for wall installations. This will provide a stronger bond and more flexibility for the small mosaic tiles. White mortar is ideal for glass tile.

Should mosaic tiles be installed offset or stacked?

Offset installation creates a less uniform look that is often more appealing with mosaics. Stacked adds more grout lines and can look busier. Base choice on the mosaic style.

Can I use regular grout with mosaic tiles?

Yes, sanded grout is fine for most mosaic tiles with joint widths 1/8″ or larger. Use unsanded grout for smaller mosaic tiles and grout lines. Add latex additive for more flexibility.

How long does it take for grout to dry when tiling?

Grout takes 24-48 hours to dry fully. Avoid excess moisture for 72 hours to cure properly. Allow extra drying time in cool, humid conditions.


Installing a mosaic tile backsplash offers endless design possibilities for your kitchen or bath. With the right tools and materials, meticulous planning, and careful technique, you can achieve a stunning do-it-yourself mosaic project. Always prepare the surface properly, work in manageable sections, allow adequate drying time, and care for the finished backsplash. With some patience and creativity, you can use mosaic tiles to add a custom, artistic focal point.