Firstly, a leveling treatment is conducted on the toilet floor, which is essential for those who are new to home renovation or are renovating again. If you are planning to replace the toilet tiles, it is crucial to level the floor using cement mortar after removing the existing tiles. This is to ensure that waterproofing can be applied properly, as only then can we effectively prevent leaks caused by uneven application of the waterproof coating.

2. Ensure thorough application at seam areas: The joints between the bathroom walls and floor, as well as those between the water supply and drain pipes and the floor, are prone to issues. During construction, always supervise the workers to meticulously handle these edges and corners, and make sure the waterproof coating is applied "adequately."

3. Wall treatment is also crucial in general waterproofing for bathrooms. The wall surface should be coated with a waterproof paint about 30 centimeters high to prevent water from seeping through. However, if the bathroom walls are non-load-bearing lightweight walls, the entire wall should be covered with waterproof paint. If your home uses a two-panel shower screen, both adjacent walls should be fully coated. And if you have a bathtub, the height of the waterproof paint on the wall adjacent to the bathtub should be slightly higher than the rim of the bathtub.

4. It is essential to conduct a waterproofing test after the bathroom construction is completed. Block the bathroom drain, build a 25-centimeter-high "barrier" at the door, and then fill the bathroom with water to a height of 20 centimeters. After 24 hours, inspect the walls and floors for any signs of leakage. This 24-hour waterproofing test is crucial for ensuring the quality of the bathroom waterproofing work, and you must perform it.