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Mistakes in application of polymer cement waterproof coatings
Polymer cement waterproof coating, commonly known as JS waterproof coating, has seen rapid development and wide application since the late 20th century. Its popularity stems from its excellent physical properties, simple construction methods, and ability to be applied on wet bases. However, in recent years, numerous quality issues have emerged, leading to a poor reputation among many construction companies and regulatory authorities. It's regrettable that a product once promising now faces challenges due to substandard alternatives within just a decade. The reasons behind this are not only due to low-price competitors compromising quality and weak construction supervision, but also improper usage of the product.
Why is it used improperly? This is often due to misunderstandings within the industry. Experts at Qinglong Waterproof have identified several key misconceptions:
1. **Misunderstanding about Latex Selection and Ingredient Ratios**
JS coatings work by modifying cement-based materials with synthetic polymer latex. This improves flexibility while maintaining the strength and water resistance of cement. However, the type and amount of latex significantly impact performance. Two common types are polyacrylate and polyvinyl acetate latex. Polyacrylate offers better modification but is more expensive, while polyvinyl acetate is cheaper but less effective. Many people mistakenly believe that more latex means better performance, leading some manufacturers to dilute raw latex with water, creating inferior products. Others use cheap alternatives like white glue or 107 glue, which can severely damage the coating’s integrity.
2. **Lack of Understanding of Classification**
JS coatings are divided into two types based on their elongation and water resistance: Type I (high elongation, suitable for areas with movement) and Type II (lower elongation, ideal for long-term water exposure). However, many projects misuse these classifications, applying Type I on roofs and Type II in basements, which leads to poor results and potential failures.
3. **Coating Thickness vs. Number of Applications**
Proper thickness is crucial for waterproofing effectiveness. Standards require a minimum of 1.5–2.0 mm, yet many projects focus only on the number of coats rather than the final thickness. Some contractors dilute the coating to save costs, resulting in thin layers that fail over time.
4. **Neglecting On-Site Mixing Effects**
JS coatings are two-component systems requiring proper mixing. Improper mixing or lack of tools leads to incomplete phase separation, reducing film quality. Many construction teams overlook this critical step, compromising the coating’s performance.
5. **Misunderstanding Tensile Strength**
Higher tensile strength isn’t always better. Some products show high strength due to heat aging, but this doesn’t guarantee durability. It’s important to test for heat aging retention rather than focusing solely on tensile numbers.
6. **Improper Base Positioning**
The placement of the base layer affects stress distribution. Incorrect positioning can lead to cracks and reduced effectiveness. Unfortunately, many projects ignore this detail, placing the base incorrectly and risking failure.
7. **Misconception About Wet Base Application**
While JS coatings can be applied on wet bases, they still require controlled moisture levels. Too much moisture hinders latex curing, while too little affects cement hydration. Ideal conditions are between 5°C and 35°C, with humidity around 50%–70%.
8. **Incorrect Use of Water Addition**
Some manufacturers allow water to be added during the first coat to improve adhesion. However, excessive water or improper ratios can degrade film performance. Many contractors abuse this practice, leading to subpar results.
In conclusion, the success of JS coatings depends on proper selection, correct application, and adherence to standards. Misunderstandings and shortcuts can lead to costly failures. Always consult experts and follow guidelines to ensure long-lasting protection.