Installation Guide – Calacatta 2″ Honeycomb (Hex) Honed White Marble Mosaic Tile

Material Notes

• Natural Calacatta white marble with soft gray veining and a honed (matte) finish.
• 2″ hex (“honeycomb”) chips, mesh-mounted on ~12″×12″ sheets.
• Ideal for walls, backsplashes, shower surrounds, and light-traffic residential floors. Numerous grout joints improve traction versus large tiles.

Step 1: Surface Preparation

• Substrate must be clean, dry, sound, and flat (≤ 1/8″ variation in 10′). Skim/patch as required for mosaics.
• Approved substrates: cement backer board, properly cured concrete, or mortar bed meeting ANSI standards.
• Wet areas: install an ANSI A118.10 waterproofing membrane; shower floors require a 1/4″ per foot slope to the drain.
• Always use white setting materials under light marble to prevent shadowing/picture-framing.

Step 2: Dry Layout & Planning

• Blend sheets from multiple cartons to distribute natural shade/vein variation.
• Snap level reference lines; center the layout and plan balanced perimeter cuts (aim for half-hex cuts at edges).
• Trim mesh edges so sheets interlock and the hex pattern continues seamlessly; stagger sheet seams to avoid a visible grid.

Step 3: Adhesive (White Thin-Set) Application

Adhesive:

• White, polymer-modified thin-set for natural stone (ANSI A118.4/A118.15). Avoid premixed mastic, especially in wet zones.

Trowel & Technique:

• 3/16″ V-notch (or 1/4″×3/16″ V-notch) on flat substrates.
• Key in mortar with the flat side, comb in one direction, then lightly flatten ridges so they don’t telegraph through the mosaics.
• Work in small areas you can cover within 10–15 minutes to avoid skinning.

Step 4: Setting the Sheets

• Set along layout lines, interlocking edges so hex joints align uniformly.
• Embed with a rubber grout float or beating block to achieve full contact and a flat plane.
• Maintain factory joint spacing—do not butt-joint.
• Lift and reset if lippage occurs; back-butter individual hexes where needed.
• Immediately clean squeeze-through thin-set from joints and faces with a soft, barely damp sponge/microfiber.

Step 5: Cutting & Detailing

• Use a wet saw with a continuous-rim diamond blade for marble; painter’s tape over the cut line helps minimize chip-out.
• Dress exposed cuts with a rubbing stone; finish edges with stone trim, metal profiles, or matching moldings.

Step 6: Grouting (Honed Marble)

• Allow thin-set to cure (typically 24 hours).
• For joints ≤ 1/8″, use unsanded grout. For ~1/8″–3/16″, a fine-aggregate, marble-safe grout may be used—test first to confirm no abrasion.
• On white marble, consider a marble-safe grout release or pre-seal to reduce pigment uptake; select a light, neutral grout for a soft look.
• Pack joints diagonally with a rubber float; clean with minimal water to avoid washout or shading.

Step 7: Sealing

• After grout cures (≈72 hours), apply a penetrating, breathable sealer approved for marble and grout (choose a natural-look sealer to preserve the honed appearance).
• Re-seal periodically based on use/exposure (e.g., every 1–2 years in wet or high-use areas).

Maintenance

• Clean with pH-neutral, non-abrasive stone cleaners only; avoid acids, vinegar, bleach, and abrasive pads (marble can etch).
• In showers, squeegee/wipe dry after use to limit mineral deposits; use marble-safe scale removers if needed.

Movement Joints

• Honor building/structural joints and provide soft joints per TCNA EJ171 at perimeters, changes of plane, and large expanses.
• Use 100% silicone (stone-safe) at inside corners and where tile meets dissimilar materials.

Important Notes & Disclaimer

• Natural Calacatta varies in tone and veining; dry-lay and blend sheets before setting. Expect slight size/thickness tolerances common to mosaics.
• Avoid topical/high-sheen coatings unless an enhanced look is desired; they can alter the honed finish.
• Stonemarket USA is not responsible for substrate issues or improper installation. Professional installation is recommended.