Waterproofing is a critical aspect of home maintenance, and choosing the right waterproof coating is the first step toward effective protection. However, with so many options available on the market—each labeled with technical terms like “polymer,†“single component,†“water-based,†or “acrylateâ€â€”it can be confusing for consumers to decide which one is best suited for their needs. To help clarify this, we visited a B&Q store and spoke with experts who explained the different types of waterproof coatings currently available, aiming to guide homeowners in making an informed choice.
There are four main categories of waterproof coatings commonly used indoors:
1. **Rigid Mortar (Hard Mortar):**
This type consists of a 1:4 ratio of emulsion to mortar. It’s known for its strong water-repelling properties once cured, forming cement-like lumps that resist moisture. It’s ideal for back surfaces but not suitable for areas prone to movement or cracking. The downside is that it can crack if the base layer shifts. Price ranges from 200–300 yuan per 18kg barrel, covering about 10–13 square meters.
2. **Flexible Mortar:**
With a 5:4 ratio of emulsion to mortar, flexible mortar offers elasticity, allowing it to withstand minor cracks in the base. It’s commonly used on walls and floors but not recommended for ceilings or back surfaces. Some versions, like silica gel-based coatings, are high-end and more expensive (around 600 yuan per barrel), but they’re rare in the market. Prices range from 300–500 yuan per 18kg barrel.
3. **Acrylate Coating:**
A liquid, ready-to-use product that is water-based and easily blends with surface gaps to create a strong waterproof layer. It outperforms flexible mortars in some cases and is ideal for long-term water exposure. After application, surface treatment such as sanding is needed to ensure proper adhesion. It costs between 300–500 yuan per 18kg barrel.
4. **One-Component Polyurethane:**
Known for its extreme flexibility, this coating can stretch over 300% and resists cracking even when the base moves. It’s highly effective but has a strong odor and may not meet environmental standards for all brands. It requires careful application with a scraper and surface treatment before tiling. Price is around 500 yuan per 18kg barrel.
Drying times vary depending on weather conditions, though the final waterproof effect remains unaffected. Mortar typically dries in 24 hours, while acrylates and polyurethanes may take 24–48 hours.
Before applying any coating, it’s essential to properly prepare the base layer. Ensure the surface is clean, smooth, and free of dust, dirt, and oil. Any imperfections can lead to cracking and reduced effectiveness.
When purchasing, focus on the product's nature rather than labels. Look for terms like “universal†or “flexible†and check the emulsion-to-mortar ratio. Price can also be an indicator of quality—significant differences in cost for similar products should raise questions.
Many products are marketed as “kitchen and toilet†specific, but most indoor waterproof coatings can be used in these areas. For reliability, it’s best to buy from reputable stores like B&Q, where you can be more confident in the authenticity of the products. Avoid letting contractors handle the purchase entirely, as it can lead to unnecessary markups.
By understanding the differences and focusing on quality, homeowners can make smarter choices and avoid common pitfalls in waterproofing.
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