Moisture can pose great risks to the integrity of concrete floors, industrial surfaces, and flooring systems over slab floors. As water vapor travels upwards in the substrate, it may cause problems in adhesives, coatings, and finished floors, resulting in bubbling or peeling. Moisture control is thus a necessary step before installing a new floor or protective surface system. This article highlights the major advantages of moisture vapor barrier coating, explains its applications, and discusses the factors that need to be considered before applying the coating.
1. What Is Moisture Vapor Barrier Coating?
A moisture vapor barrier coating is a specialized coating used to prevent the passage of water vapor through porous substrates such as concrete. It is different from a normal waterproofing system that takes care of liquid water problems.
These may have their basis in different formulations, such as epoxy or polyurethane resins, among others. The permeability of these coatings varies with the process of their application. The substrates can have either high moisture content tolerance or require certain conditions for their application. In this case, it is important to consider moisture testing, proper surface preparation, and recommended coating thickness.
2. What Are the Main Benefits of Moisture Vapor Barrier Coating?
Reduces Moisture Vapor Transmission
The first direct benefit of moisture vapor barrier coating is limiting the movement of moisture vapor through the substrate. A concrete floor that is placed at ground level or below grade is likely to transfer moisture continuously through the substrate to the soil around. This may become problematic when the moisture vapor gets trapped under the floor finish surface.
A properly selected barrier reduces the rate at which vapor reaches the upper surface. It is particularly critical when installing sensitive flooring. This will depend on several parameters like the thickness of the coating, permeability, concrete moisture content, and the curing process. Hence, the right kind of barrier needs to be chosen based on the parameters measured at the site and not as a universal solution for all slabs.
Protects Substrates From Moisture-Related Damage
High moisture levels can lead to discoloration, blistering, peeling, efflorescence, and deterioration of any applied coatings. With the help of moisture vapor barrier coatings, it will be possible to reduce the vulnerability of the final product to moisture migration underneath.
This is particularly beneficial for those situations where the concrete substrate is expected to be exposed to high amounts of moisture. Nonetheless, this is not a substitute for waterproofing where liquid water is penetrating the substrate through cracks, openings, or hydrostatic pressure.
Improves the Performance of Floor and Surface Coatings
Moisture can affect the adhesion of concrete to the floor coatings. When the vapor gets trapped below the coating, there could be some bubbles and weakness, which will result in delamination of the surface. A moisture vapor barrier coating helps to create a better-controlled interface.
For projects using epoxy or polyurethane flooring, controlling substrate moisture can be an important part of installation planning. Depending on the manufacturer’s specifications, the system may require a particular surface profile, coating thickness, and curing period. Following these requirements can significantly improve application consistency.
Extends Surface Service Life
A moisture vapor barrier coating can also support the long-term durability of a flooring system by reducing one of the factors that can contribute to premature coating failure. With proper control of moisture problems, the surface will be able to function for an extended period of time without having to be replaced or repaired extensively.
There is a huge variation in service life depending on traffic, impacts, chemicals, temperature, cleaning procedures, and quality of installation. In a warehouse exposed to heavy forklift traffic, for instance, mechanical wear may become a greater concern than moisture after installation. Vapor protection should therefore be considered as one component of an overall flooring strategy.
Reduces Maintenance and Repair Requirements
Repeated coating failures can increase both material and labor costs. The removal of damaged floors, the preparation of the concrete, and the installation of a new system will take significantly more time compared to fixing moisture conditions at the very beginning of installation.
A moisture vapor barrier coating can be used as a means of reducing moisture repairs provided that the right material is used and properly installed. The maintenance program should still consist of inspection, cleaning, crack detection, and fixing any damage.
3. Where Is Moisture Vapor Barrier Coating Commonly Used?
Concrete Floors and Flooring Systems
The use of moisture vapor barrier coating is typical for concrete floors. Garages, workshops, warehouses, commercial buildings, and basements may require vapor control before installing decorative or protective flooring. For new construction, a moisture test will help determine the state of the concrete needed for the selected floor covering. Moisture testing can also be used to find out whether moisture affects the coatings or adhesives of the building.
Industrial and Commercial Facilities
Industrial and commercial facilities often have concrete floors that must withstand moisture, heavy traffic, chemicals, abrasion, and UV exposure. A typical flooring system may include a primer, intermediate coating, and topcoat. The primer helps improve adhesion, while the intermediate layer builds thickness and provides additional protection. The topcoat is used to enhance surface resistance to wear, weather, and other operating conditions.
For industrial and commercial facilities that require a durable topcoat over exposed concrete, JINCHENG’s Waterproof Polyaspartic Resin is a good choice. Polyaspartic resin is commonly used as a topcoat because of its strong abrasion resistance, load-bearing performance, UV stability, and weather resistance. It also cures quickly and provides good adhesion to concrete and other base materials. When used together with a suitable flooring system, it can provide an additional protective layer for concrete surfaces exposed to demanding conditions.
Renovation and New Construction Projects
In the case of a renovation, the use of a moisture vapor barrier will be appropriate where an existing slab presents some form of moisture problem before installing a new floor covering. In such cases, there is no need to replace the substrate until the moisture content is checked to find a solution to the problem.
In a new building, things are different because concrete continues emitting moisture even after a long period of time since its placement. Testing should therefore guide the timing and selection of the flooring system.
4. Conclusion
In addition to controlling the movement of moisture, there are other advantages that are attributed to moisture vapor barrier coating. They include protecting concrete surfaces, enhancing the reliability of flooring, extending the lifespan, and minimizing moisture-related maintenance efforts. However, there should be moisture testing, proper surface preparation, product compatibility, adequate thickness of application, and proper curing conditions for success.
In any project where the issue of moisture control is a challenge, the choice of the right coating should be based on site-specific requirements instead of generic specifications. If you have any queries regarding moisture vapor barrier coating, do not hesitate to contact JINCHENG.