1. Be cautious not to damage the original waterproof layer during bathroom renovation:
Many homeowners assume that the existing waterproofing is sufficient, especially after a quality inspection. However, during water and electrical renovations, it's common to reconfigure plumbing or move fixtures, which can risk damaging the original waterproof layer. Always monitor the work closely and remind the contractors to avoid any unnecessary damage. If the original layer is compromised, it must be repaired immediately or even redone to prevent future leaks.
2. Choose the right waterproofing material:
The Ministry of Construction recommends using one-component environmentally-friendly polyurethane coating. This type of material adheres well to pipes and floors, penetrates into small gaps, and doesn’t shrink when dry. It’s more flexible and durable compared to rigid materials like cement-based waterproofing. In bathrooms with many pipes and joints, this paint costs around 50–60 yuan per square meter, making it an affordable option for most homeowners.
3. Avoid applying waterproofing on rainy days:
To ensure optimal performance, the waterproof coating should be applied in three layers. The drying time for one-component polyurethane is about 3–4 days. Applying it during rain can significantly reduce its effectiveness, as moisture can interfere with the bonding process and weaken the waterproofing result.
4. Don’t forget to waterproof the floor:
Before laying tiles, the floor must be properly waterproofed. After the tiles are installed, make sure the surface has a slight slope (about 1%) directing water toward the drain. This helps in proper drainage and prevents water from pooling, reducing the risk of mold and structural damage.
5. Ensure wall waterproofing is done correctly:
When taking a shower, water often splashes onto nearby walls. Without proper waterproofing, these areas can become damp, leading to mold and mildew. Before tiling the walls, apply waterproofing up to at least 30 cm high. For non-load-bearing walls, it’s recommended to go up to 1.8 meters to provide full protection against moisture.
6. Always conduct a waterproof test:
After completing the waterproofing, it’s crucial to perform a test to ensure everything is working properly. If the test fails, the work must be redone. It’s wise to have a professional or experienced person oversee the process to catch any issues early and avoid costly repairs later on.
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