Waterproofing is a must-have in any new home renovation. If you've been through the process, you know that poor waterproofing can ruin even the best interior design. Nowadays, with so much information available online, people are becoming more aware of the importance of proper waterproofing. Here's what you need to know:
1. **Which areas require waterproofing?**
The main areas that need waterproofing are the floors and walls of bathrooms, kitchens, balconies, and basements. If you live on the ground floor, it’s essential to waterproof all floors and walls to prevent moisture from seeping in. Also, any grooves in the walls where pipes are installed should be treated. If you’re changing the drainage system or floor drains during renovation, extra care should be taken around those areas.
One area often overlooked is the balcony. Even if it’s not exposed, most people use it for washing clothes, so waterproofing is still necessary. When pipes or drains pass through the floor, make sure the surrounding area is properly sealed.
2. **How to estimate waterproofing costs?**
During a new home renovation, the original waterproof layer may be damaged, so re-waterproofing is usually needed. As an important part of the process, using quality materials and hiring skilled workers typically costs between $60 to $100 per square meter, which is about 1% of the total renovation cost.
To calculate the waterproofing area:
- For the bathroom: [(floor perimeter - door width) × 1.8m (height) + floor area]
- For the kitchen: [(floor perimeter - door width) × 0.3m (height) + floor area]
A thickness of 1.5mm is sufficient as long as it meets national standards.
3. **How to identify genuine waterproof coatings?**
Since waterproofing is a hidden project, once done, it's hard to replace. That’s why choosing reliable products is crucial. Look for clear packaging with brand logos, product names, net weight, origin, and certificates. Reputable brands often have anti-counterfeit labels, so always check before purchasing.
4. **Are water-based waterproof coatings eco-friendly?**
Not necessarily. While many are water-based, some companies falsely claim they are more environmentally friendly than oil-based ones. The truth is, both types can be safe if they meet environmental certifications like China Environmental Labeling or CTC. Acrylic-based coatings are currently considered the most trusted and widely used.
5. **Why is bathroom waterproofing done up to 1.8 meters?**
This height ensures effective protection against water damage. Most showers are installed around 1.8 meters, so if the waterproof layer is lower, water can penetrate the walls over time, leading to mold and peeling. Non-shower walls can be at 1.5 meters, but it's better to go with 1.8 meters for added safety. In lightweight or newly built walls, waterproofing should go all the way to the top. Similarly, in kitchens, waterproofing should extend 0.3 meters up the walls, and ideally 1.5 meters near sinks.
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