Decoration skills: sunken bathroom waterproof once and for all

In order to meet the growing demand for a more humanized living experience, many modern homes are designed with sunken bathrooms. These layouts offer greater flexibility and convenience, especially when it comes to drainage. Additionally, if the area beneath the bathroom is not used as a living space, it can help reduce noise from daily activities. However, while sunken bathrooms have their advantages, they also come with challenges—especially when it comes to waterproofing. Waterproofing a sunken bathroom is one of the most critical steps in its construction. If not done properly, it can lead to serious problems like water leakage, mold, and structural damage over time. Today, we’ll go through some essential tips on how to achieve long-lasting waterproofing in a sunken bathroom. First, timing is crucial. It’s best to apply waterproofing before backfilling, but if that’s not possible, at least do it once after the backfilling is complete. If the developer has already done the waterproofing, it’s still advisable to redo it, as the original layer might be damaged during plumbing or electrical work. A second round of waterproofing ensures extra protection. When choosing materials for backfilling, avoid using slag or other irregular materials. They can create voids and uneven surfaces, which may lead to cracks or even ground settlement. Instead, use lightweight and moisture-absorbent materials like ceramsite or coal ash. These materials are not only easier to handle but also reduce pressure on the floor slab, making them ideal for sunken areas. Now, let’s talk about the actual waterproofing process. The key to long-term success lies in both material quality and proper installation. In wet areas like bathrooms, it's recommended to use a mortar-based waterproofing agent. Walls should be coated up to at least 1.8 meters, especially if there's a built-in cabinet nearby. This helps prevent water from seeping into adjacent areas. Here’s a step-by-step guide for proper waterproofing: 1. Apply two layers of waterproof coating, ensuring it extends beyond the edge of the sunken area by at least 40 cm. This prevents water from spreading outward. 2. Install a brick or concrete partition to divide the sunken area into smaller grids (around 400x400 mm). This step is often overlooked but plays a vital role in preventing future subsidence. 3. Fill the grid with moisture-resistant ceramsite or coal ash. No need to compact it too much—its main purpose is to absorb excess moisture. 4. Add a reinforced mesh made of 5mm steel bars, placed over the grid to strengthen the concrete layer above. 5. Pour a 40mm thick C25 fine stone concrete layer, sloping it slightly for proper drainage. After the waterproof layer dries, apply a cement slurry to protect it before tiling. In addition to waterproofing, the renovation of a sunken bathroom requires careful attention to materials and craftsmanship. Choosing high-quality products and hiring experienced professionals is essential to ensure the entire system remains watertight for years to come. With the right approach, your sunken bathroom can be both functional and durable.

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