Installation Guide – Star Square Honed Marble Mosaic Tile (Dolomite, Ruby Green & Pearl Black)

Material Notes

• Three-stone blend: Dolomite, Ruby Green marble, and Pearl Black marble, all featuring a honed (matte) finish.
• Mesh-mounted mosaic sheets with factory-set spacing; natural variation in color, veining, and texture is expected.
• Suitable for walls, backsplashes, shower surrounds, and light-traffic residential floors. The honed finish provides improved slip resistance compared to polished surfaces.

Step 1: Surface Preparation

• Ensure the substrate is clean, dry, structurally sound, and flat (≤1/8″ over 10′). Repair or skim uneven areas before installation.
• Approved substrates include cement backer board, cured concrete, or a properly prepared mortar bed meeting ANSI standards.
• In wet areas, install an ANSI A118.10 compliant waterproofing membrane according to manufacturer instructions.

Step 2: Dry Layout & Color Distribution

• Dry-lay multiple sheets and evenly distribute Dolomite, Ruby Green, and Pearl Black elements throughout the layout.
• Establish level reference lines to maintain straight courses and visually balanced cuts at edges and fixtures.
• Trim mesh backing as needed and stagger sheet seams to minimize visible grid patterns.

Step 3: Adhesive (White Thin-Set) Application

Adhesive:

• Use a white, polymer-modified thin-set suitable for natural stone (ANSI A118.4 or A118.15). White mortar prevents discoloration beneath Dolomite and Pearl Black components.
• Avoid premixed mastics, especially in wet or heat-exposed environments.

Trowel & Technique:

• Recommended trowel size: 3/16″ V-notch or 1/4″ × 3/16″ V-notch, depending on substrate flatness.
• Key mortar into the substrate, comb in one direction, then lightly flatten ridges to prevent thin-set from telegraphing through small mosaic pieces.
• Work in small sections to avoid premature skinning of the adhesive.

Step 4: Setting the Sheets

• Align sheets with reference lines and press firmly using a rubber grout float or beating block.
• Maintain factory spacing; do not force sheets together. Use wedge spacers if required.
• Back-butter individual pieces as needed to correct plane or ensure full mortar coverage.
• Remove excess thin-set from joints and tile surfaces immediately using a soft, lightly damp sponge.

Step 5: Cutting & Detailing

• Use a wet saw equipped with a continuous-rim diamond blade designed for marble.
• Apply painter’s tape along cut lines to reduce chipping, especially on darker Pearl Black pieces.
• Finish exposed edges with stone trim, metal profiles, or coordinating moldings.

Step 6: Grouting (Honed Marble)

• Allow thin-set to cure fully (typically 24 hours).
• Use unsanded grout for joints ≤1/8″ to protect the marble surface.
• Color tip: neutral gray, soft charcoal, or warm beige grout tones complement the contrast of Dolomite, Ruby Green, and Pearl Black. Always test first.
• Optional: apply a marble-safe grout release or pre-seal the surface to minimize pigment absorption.
• Apply grout diagonally with a rubber float and clean with minimal water.

Step 7: Sealing

• After grout has cured (approximately 72 hours), apply a penetrating, breathable sealer approved for marble and grout.
• Reapply sealer as needed based on exposure and usage, typically every 1–2 years.

Maintenance

• Clean using pH-neutral, non-abrasive stone cleaners only.
• Avoid acidic or abrasive products such as vinegar, bleach, or scouring pads.
• In wet areas, wipe surfaces dry after use to help prevent mineral buildup.

Movement Joints

• Follow TCNA EJ171 guidelines for expansion and movement joints.
• Use 100% stone-safe silicone at changes of plane, corners, and transitions.

Important Notes & Disclaimer

• Natural stone mosaics will vary in color and veining; dry-blend sheets before installation for best visual results.
• Always use white thin-set when installing light or mixed-tone natural stone mosaics.
• StoneMarket USA is not responsible for improper installation or substrate conditions. Professional installation is strongly recommended.