Waterproof as much as possible without destroying the original waterproof layer
Try not to damage the original waterproof layer
When a new building is handed over, the bathroom is typically already waterproofed. However, during renovation, many people lay floor tiles, level the floor, or rearrange plumbing pipes, which can easily damage the original waterproof layer. This means that it's crucial to redo the waterproofing during renovation. Start by leveling the floor with cement mortar, then thoroughly clean the surface before applying polyurethane (water glass) waterproof coating two to three times. Pay special attention to the corners where walls meet the floor and around the water pipes—these are the most common leakage points. Make sure the workers properly treat these areas. Also, ask the renovation team to apply a 10–20 cm layer of polyurethane around the vertical pipes in the kitchen and bathroom, and reapply the waterproof coating for extra protection.
"Leak test" to check waterproofing
After completing the waterproofing, seal the door and drain, fill the bathroom floor with water up to a certain level, and mark the height. If there’s no noticeable drop in water level after 24 hours and no leaks are detected downstairs, the waterproofing is considered successful. If the test fails, the work must be redone and retested. Don’t skip this step—many contractors ignore it, just applying some sealant and finishing early. Once water leaks occur, it's too late to fix. So always perform the leak test. Only after confirming no leaks should you proceed to lay the floor tiles.
Bathrooms are often wet, making them slippery. To prevent accidents, it's best to use anti-slip floor tiles with a raised pattern. These tiles not only offer excellent waterproofing but also remain non-slip even when wet. Additionally, ensure the floor slopes slightly toward the drain to help with water drainage and cleaning.
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