In the bathroom, water is constantly present, and even a small mistake during renovation can lead to serious issues, especially when it comes to waterproofing. As an expert in home improvement, I want to emphasize the importance of proper waterproofing for your bathroom. A well-executed waterproofing job not only prevents leaks but also protects your home from long-term damage. Here's a detailed guide on how to achieve foolproof bathroom waterproofing.
First, ensure that the floor slopes toward the drain. Use cement mortar or crushed concrete, making sure the surface is smooth. The slope near the door should be gentle, while the area near the drain should have a steeper incline, depending on the specific layout.
Second, pay special attention to the areas around pipes and floor drains. Seal the pipe roots with building sealant, then apply a layer of cement and protect the edges. Reinforce the area with 1–2 layers of glass fiber cloth to strengthen the waterproof layer. The same process applies near the floor drain.
Third, clean the walls thoroughly, removing any dust or debris. At the corners where the wall meets the floor, make sure to round off sharp angles before applying the waterproof coating. Apply 1–2 layers of reinforced glass fiber cloth for added protection.
Fourth, when using polyurethane waterproof coating, the total thickness must be at least 1.5 mm. Do not rely solely on the number of coats. Start by applying the coating to the pipe roots and corners, let it dry for 4 hours, then apply the coating evenly over the entire area. Avoid bubbles or slippage. After 24 hours of curing, apply the next coat. Ensure each layer is applied perpendicular to the previous one. When the final coat is semi-cured, sprinkle coarse sand to improve adhesion with future cement mortar.
Fifth, extend the waterproof layer beyond the bathroom door by 30 cm. The floor waterproof layer should be 20 cm high above the ground. For walls in showers, the waterproof layer should be at least 180 cm high. It's recommended to apply waterproofing on the wall up to 80 cm for better protection.
Sixth, perform a water retention test as required. Avoid the old method of sealing the riser first, as this can damage the waterproof layer. Instead, waterproof the area first, install the riser, and then reapply waterproofing in that section to prevent damage.
These steps are essential for ensuring your bathroom remains leak-free and durable. Common materials like polyurethane coatings are widely used, and following these techniques will help you achieve professional results. Paying attention to details during the process ensures long-term performance and peace of mind. Always take care with every step—your future bathroom depends on it.
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