How to Install a Mosaic Floor: Mesh-Mounted Tiles, Step by Step

Your custom mosaic arrives on pre-numbered mesh sheets, so installing it is a lot like doing a puzzle. Any tile installer can lay it, and a confident DIYer can too. Here is how it works, step by step.

What arrives in the box

• Your mosaic, split into numbered mesh sheets. The tiles are fixed to a fiberglass mesh on the back.
• A layout guide showing where each numbered sheet goes.
• Extra tiles for small repairs or adjustments.
• Any metal lettering, already in position on its sheets.

Tools and materials

• Tile adhesive (thin-set) suited to your tile: porcelain, glass or stone. Use a white adhesive for glass or light marble so it doesn't show through.
• A small notched trowel suitable for mosaic
• A rubber grout float and a flat board or beating block
• Grout in your chosen color, a bucket and sponges
• A level, a tape measure and a pencil or marker
• Penetrating sealer if your mosaic includes marble or other natural stone

Step 1: Prepare the surface

The floor must be clean, dry, solid and flat. Fill cracks and level any dips first; mosaic follows whatever is underneath, so bumps will show. On a new floor, your installer may use a membrane or backer board as they would for any tile.

If the mosaic is going into an existing floor, mark its outline and cut out the old flooring so the finished mosaic sits flush.

Step 2: Dry-lay the numbered sheets

Before any adhesive goes down, lay all the sheets out in number order, following the layout guide. This checks the fit, shows you the finished design and lets you mark guidelines on the floor.

Step 3: Spread the adhesive

Lift the sheets off (keep them in order) and spread adhesive over a small area with the notched trowel. Work one section at a time so the adhesive doesn't skin over before the tiles go in.

Step 4: Set the sheets, mesh side down

Press each sheet into the adhesive with the mesh side down. The mesh stays on and goes into the adhesive; it holds the tiles in place. Tap the sheet flat with a board so every tile is fully bedded and level.

Keep the gaps between sheets the same as the gaps between tiles inside each sheet, so the joins disappear. Metal letters sit flush with the tile. Wipe off any adhesive that squeezes up between tiles before it sets.

Step 5: Let it cure, then grout

Leave the adhesive to cure for the time the manufacturer recommends, usually around 24 hours. Then press grout into the joints with a rubber float, working diagonally across the tiles. Remove the excess with a damp sponge, rinse often, and buff off the haze once it dries.

Step 6: Seal if needed

Porcelain and glass don't need sealing. Marble and natural stone do: apply a penetrating sealer once the grout has cured, and reseal when water stops beading on the surface. We cover this in detail in how to seal and clean a marble mosaic.

Common mistakes to avoid

• Removing the mesh. It stays on the back of the tiles and goes into the adhesive.
• Skipping the dry-lay. It is the easiest way to catch alignment problems.
• Uneven joints between sheets, which make the sheet edges visible.
• Using gray adhesive under glass or light marble, which can show through.
• Walking on it before the adhesive and grout have cured.

Frequently asked questions

Do I need a professional installer?

Any tile installer can lay a mosaic on mesh sheets; it is installed like regular tile. A confident DIYer can do it too by following the numbered layout guide.

Do I take the mesh off before installing?

No. The mesh is on the back of the tiles and goes into the adhesive. It stays in place permanently.

How long does installation take?

A typical 4 × 3 ft entrance can be laid in a few hours. Allow about a day for the adhesive to cure before grouting, and longer before heavy foot traffic.

Can a mosaic go into an existing floor?

Yes. The area is marked and cut out so the mosaic sits flush with the surrounding floor. Tell us the depth of your floor and we can advise.