In the bathroom, water is constantly flowing. If the renovation isn't done carefully, it can lead to serious hidden issues, especially in terms of waterproofing. As a result, it's crucial for homeowners to pay close attention to proper waterproofing measures. A well-executed bathroom waterproofing job can prevent future wall leaks and ensure long-term durability. Below are some key steps and tips on how to achieve effective bathroom waterproofing.
First, when preparing the floor, make sure it slopes towards the drain. Use cement mortar or lightweight concrete, and keep the surface smooth. The slope should be gentle near the door and steeper near the drain, depending on the specific layout.
Second, focus on sealing around pipe roots. Apply building sealant tightly and smooth it with cement. After that, reinforce the area with 1–2 layers of glass fiber cloth to strengthen the waterproof layer. The same process applies near the drain.
Third, clean the walls thoroughly to remove any dust or debris. Pay special attention to the corners where the wall meets the floor. When applying the waterproof coating, place 1–2 layers of glass fiber cloth in these areas for added protection.
Fourth, when using polyurethane waterproof coating, the total thickness should be at least 1.5 mm. Don’t rely on the number of coats—instead, ensure even coverage. Start by brushing the tube roots and corners, let it dry for 4 hours, then apply the coating over the entire area. Avoid bubbles or uneven spots. After 24 hours of curing, apply the next coat. Each subsequent layer should be applied perpendicular to the previous one. Finally, sprinkle coarse sand on the semi-cured surface to help with bonding during tiling.
Fifth, extend the waterproof layer beyond the bathroom door by 30 cm. The floor waterproofing should go up 20 cm above the ground level, while the wall waterproofing in shower areas should be at least 180 cm high. It’s recommended to use L8 waterproofing for added protection on the walls.
Sixth, perform a water retention test as required. Avoid the old method of installing the riser before waterproofing. Instead, waterproof first, then install the riser, and reapply waterproofing around the riser to prevent damage to the existing layer.
These steps are essential for ensuring a durable and leak-free bathroom. The most common waterproofing material used is polyurethane coating. By following these detailed practices, you can significantly improve the quality of your bathroom’s waterproofing. Always pay attention to every detail, as the performance of your bathroom depends on it.
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