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Preparation Steps for Cracked Tiles Before Microcement
Preparation Steps for Cracked Tiles Before Microcement

Preparation Steps for Cracked Tiles Before Microcement

  1. Inspection & Assessment
    • Process: Carefully check the existing tiled surface for cracks, hollow sounds, loose tiles, or structural movement.
    • Reason: Microcement is a thin coating (2–3 mm) and will reflect any underlying movement or instability. Identifying weak areas prevents future failures.
  2. Remove Loose or Severely Damaged Tiles
    • Process: Take out tiles that are cracked through, loose, or hollow. Fill gaps with repair mortar or leveling compound.
    • Reason: Microcement needs a stable, continuous substrate. Any loose tile left underneath may cause delamination or cracking in the microcement layer.
  3. Repair Cracks & Joints
    • Process: Fill tile cracks and grout joints with epoxy filler, flexible mortar, or resin-based repair compounds. Reinforce larger cracks with fiberglass mesh.
    • Reason: Filling prevents crack patterns from telegraphing (reappearing) through the microcement finish. Mesh adds flexibility and distributes stress.
  4. Surface Cleaning & Degreasing
    • Process: Thoroughly clean tiles with industrial detergent or degreaser to remove dirt, grease, and soap residue. Rinse and let dry.
    • Reason: Adhesion is critical for microcement. Any contamination (oil, wax, dust) will reduce bonding strength.
  5. Mechanical Grinding or Sanding (Optional but Recommended)
    • Process: Lightly sand or grind the glossy tile surface to create mechanical roughness.
    • Reason: Smooth ceramic surfaces are non-porous, which reduces adhesion. Roughening ensures the primer and microcement bond effectively.
  6. Priming with Bonding Agent
    • Process: Apply an epoxy or polyurethane-based primer, sometimes with silica sand broadcast for grip.
    • Reason: Primer ensures chemical and mechanical adhesion between tiles and microcement, compensating for non-absorbent tile surfaces.
  7. Leveling with Base Coat / Microcement Foundation Layer
    • Process: Apply a base coat (often reinforced with fiberglass mesh) to cover tile joints and ensure a flat, crack-resistant surface.
    • Reason: Prevents “tile joint shadowing” (where microcement finish reveals tile pattern underneath). Mesh improves structural stability.
🔑 Key Takeaway
The main goals of preparation are:
  • Stability – remove loose tiles and fill cracks.
  • Adhesion – clean, sand, and prime for proper bonding.
  • Flatness – create a smooth, joint-free base before applying decorative microcement layers.
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