Installing a mosaic tile splashback is one of the most satisfying and high-impact weekend projects you can take on. Unlike large format tiles, mosaics are often easier for the beginner because the sheets naturally handle small irregularities in the wall.

This guide is designed for the standard kitchen setting. Follow these 7 steps, and you’ll have a stunning new splashback up in no time.

Phase 1: Preparation is 90% of the Job

Step 1: Gather Your Tools and Calculate Your Coverage

Before you begin, ensure you have everything ready. Nothing stops a project faster than a trip back to the hardware store.

What You'll Need:

1. Your ExoTiles Mosaic Sheets: Measure the square footage needed and order approximately 10% extra for cuts and mistakes.

2. Adhesive: A high-quality white tile adhesive suitable for your chosen tile material (glass, porcelain, or metal).

3. Grout: Non-sanded grout is essential for most delicate mosaic tiles (especially metal and shell) to prevent scratching. We recommend epoxy grout for its superior stain and mold resistance in kitchens.

4. Tools: Notch trowel, rubber float (for spreading grout), sponges, buckets, level, measuring tape, and safety glasses.

Tip: If your mosaic contains stainless steel or shell, ensure your grout is a non-sanded formula.

Step 2: Clean and Mark the Wall

Your wall must be clean, dry, and free of grease or paint flakes.

1. Turn off power to any outlets you are working near. Remove the faceplates from all switches and outlets.

2. Find your center. Measure the wall and lightly draw a vertical centerline using a pencil. This ensures your pattern is visually balanced.

3. Establish your base line. Use a level to draw a perfectly horizontal line about 10–15 cm above the countertop. This is your starting point. Use a temporary batten (a straight piece of wood) screwed lightly into the studs along this line to support the first row of tiles.

Phase 2: Laying the Tiles

Step 3: Apply the Adhesive

Start with small sections (about 1 square meter at a time). Adhesive can dry quickly!

1. Use the flat side of your trowel to smooth a small amount of adhesive onto the wall.

2. Turn the trowel over and use the notched side to rake the adhesive, creating uniform ridges. This ensures even coverage for a strong bond.

Step 4: Place the Mosaic Sheets

This is where your patience pays off.

1. Starting at your centerline and resting on your temporary base batten, press the first sheet firmly into the adhesive with a slight twisting motion.

2. Place the next sheet immediately beside it, ensuring the gaps (grout lines) between the sheets are exactly the same width as the small gaps between the individual tile pieces (tesserae) on the sheet.

3. Use a small wood block and a rubber mallet to lightly tap the surface of the sheet, ensuring every piece is flush and level.

Step 5: Make Your Cuts

As you reach the ends, corners, or outlets, you’ll need to cut your sheets.

• Glass and Porcelain: Use a wet saw fitted with a diamond blade.

• Stainless Steel/Metal: Use tin snips or a tile nipper for individual pieces.

Lay the entire piece first, mark where the cut is needed, and then cut and place the final piece.

Phase 3: Grouting and Finishing

Step 6: Grout the Joints

Wait at least 24 hours for the adhesive to cure completely before grouting.

1. Mix your grout according to the manufacturer’s instructions.

2. Using a rubber float, scoop the grout and spread it firmly across the surface of the tiles, forcing it into all the joints.

3. Work diagonally across the face of the tiles, making sure every gap is filled.

4. Remove excess grout using the edge of the float.

Step 7: Clean and Seal

This is the final, satisfying step that reveals the finished product!

1. Immediately after Step 6 (before the grout starts to harden), use a damp (not soaking wet) sponge to wipe the excess grout residue off the tile faces. Rinse the sponge frequently.

2. Allow the grout to cure for the time specified by the manufacturer (usually 48-72 hours).

3. Sealing: For natural materials like unglazed porcelain, shell, or porous grout, apply a clear, impregnating sealer to protect your splashback from moisture and staining.

Congratulations! You’ve just successfully installed your new mosaic tile kitchen splashback.