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Tag Building Maintenance

Complete Guide to Cement Protection Layer Installation After Roof Waterproofing for Enhanced Durability and Long-Term Building Safety

After completing roof waterproofing, it is highly recommended to apply a cement protection layer to safeguard the waterproof membrane from external environmental damage. This practice not only extends the lifespan of the waterproofing system but also enhances its overall effectiveness, ensuring long-term structural integrity. Below is a detailed explanation of the reasons and step-by-step construction process.

Illustration of cement protection layer on roof

Reasons for applying a cement protection layer:

  • Protection of the waterproof layer: The cement layer acts as a barrier against UV radiation, temperature fluctuations, and mechanical damage, preventing degradation.
  • Extended service life: It reduces the impact of environmental factors, minimizing the need for frequent repairs and replacements.
  • Enhanced waterproofing effect: By integrating with the waterproof membrane, it forms a complete system that reduces leakage risks.

Materials and preparation for cement protection layer

Construction steps:

  1. Material preparation: Use ordinary Portland cement with a strength grade of at least 32.5, medium or coarse sand with mud content below 3%, and clean water. Ensure all materials meet quality standards.
  2. Clean the waterproof layer: Before laying the cement layer, ensure the surface is flat, clean, and free of debris and cracks. Repair any imperfections with cement mortar.
  3. Check waterproofing effectiveness: Inspect for leaks and repair them promptly to maintain integrity.
  4. Mix mortar: Combine cement and sand in a ratio of 1:2 or 1:3, add water gradually, and mix to achieve the desired consistency.
  5. Apply mortar: Spread the mortar evenly over the waterproof layer with a thickness of 20-30 mm. Level the surface using a trowel or scraper to avoid hollows or cracks.
  6. Curing and protection: After application, cure the mortar by covering it with plastic film or wet cloth to prevent rapid moisture evaporation. Maintain surface moisture for 7-14 days and avoid heavy loads or activities that could compromise strength.

Curing process of cement protection layer

In summary, applying a cement protection layer after roof waterproofing is essential for forming a durable barrier that ensures building safety and longevity.

Expert Guide to Exterior Wall Leakage Repair: Waterproofing Solutions for Residential Buildings and Property Maintenance Tips

One question a day, today answering yours.

Exterior wall leakage can be effectively addressed by demolishing and redoing waterproofing, but in community residential buildings, property management may only take responsibility for safety issues like loose tiles, not leaks. They might apply basic exterior waterproof coating superficially, especially for new homes under warranty, with little motivation for older properties.

Your leakage is your concern—safety is shared, but life is personal. If property management ignores it, find your own solution. Avoid demolishing exterior walls due to safety risks. For homes on the third floor or lower, where scaffolding is feasible, consider demolition and redoing.

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For higher floors, adopt a comprehensive approach: combine exterior and interior methods with rigid and flexible solutions. Externally, use rope-based high-altitude work to fill cracks and apply waterproof glue overall. Choose weather-resistant products and follow manufacturer instructions strictly—don’t skip coats if required.

Internally, implement back-surface waterproofing as a backup. Why is this necessary? Even with exterior coating, water can seep from upper floors through cracks, as shown in images.

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The circled area in the image corresponds to leakage points, revealing extensive cracks. Coating only your floor or a few above isn’t enough—water can infiltrate from higher levels. For tall buildings, full exterior coating isn’t practical, so interior waterproofing is essential. Exterior materials degrade over time, so rely on interior defenses against rainwater.

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Note: For top-floor leaks with downward interior water trails, check the roof in addition to exterior walls. Leakage is complex; accurate diagnosis ensures effective solutions.

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