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Cracks and Hollow Walls Keep Coming Back? Full Guide to Gypsum Plaster Quality Control

 Gypsum plaster is a key step in interior finishing. Problems such as cracks, hollow spots, and peeling usually result from poor quality control during construction. To prevent these issues, strict control is needed throughout the entire process — from substrate preparation to final acceptance.

1. Substrate Preparation

  • Inspection & Cleaning: Ensure structural work is complete, remove dust, nails, and debris, and fill wall tie holes and conduits.

  • Bonding Agent: Spray evenly (≤30cm distance) in a cross pattern, covering all corners and edges.

  • Anti-crack Mesh: Apply alkali-resistant fiberglass mesh (≥25cm wide) at material junctions and pipe grooves.

2. Control with Reference Points

  • Baseline Positioning: Use laser or infrared lines to control verticality and flatness.

  • Plaster Dabs: Place dabs at corners and door/window openings, aligned vertically.

  • Guide Strips: Set gypsum guide strips every 1.5–3m as leveling benchmarks.

3. Plaster Application

  • Mixing: Stir for 3–5 minutes; use within 1 hour; never re-add water.

  • Thickness Control: Apply 4–15mm per layer; too thin → powdering, too thick → cracking.

  • Leveling: Use aluminum straightedge or H-rod; flatness tolerance ≤4mm (≤3mm for fine finish).

4. Curing & Acceptance

  • Environment: Temperature ≥2℃ in winter; avoid direct sunlight in summer; moisture content ≤10% before next step.

  • Repair & Check: Fix hollows and cracks promptly; final inspection as per Building Decoration Quality Acceptance Standards.

👉 Conclusion: To achieve crack-free and durable gypsum plaster, it is essential to follow the complete process of substrate preparation → leveling → layer application → curing & inspection.

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