Broadcasting flake directly into Moisture Vapor Barrier (MVB) coating is a topic that warrants thorough examination, especially when considering the various reasons for using a MVB and the potential impacts of this method on the effectiveness of the coating.
Why is a Moisture Vapor Barrier Being Used?
When discussing moisture vapor barriers, it's important to understand the two primary scenarios of its application: as a preventive measure and as a necessity due to existing moisture issues.
In cases where the MVB is applied as a preventive measure, the concern for moisture-related problems is more anticipatory. This approach is common in environments where moisture issues could develop over time. Here, the MVB acts as somewhat of an insurance policy against future moisture-related problems.
Conversely, when a MVB is used due to existing moisture-related issues, it's often a remedial action to address already present moisture levels in concrete slabs that exceed the tolerable limits for the intended floor covering or coating. In these scenarios, the MVB is not just preventive but essential to maintaining the integrity and longevity of the flooring system.
Impact of Broadcasting Flake into a Moisture Vapor Barrier
The practice of broadcasting flake directly into MVB brings up several considerations:
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Permeance Alteration: The primary function of an MVB is to act as a barrier against moisture vapor transmission. Introducing flakes directly into the MVB layer could potentially alter its permeance. The flakes could create pathways for vapor transmission or disrupt the continuity of the barrier, thereby reducing its effectiveness.
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Thickness Consistency: MVBs are usually applied at a recommended thickness to ensure optimal performance – typically around 16 mils or 100 square feet per gallon. Broadcasting flakes into the wet MVB might necessitate applying the MVB thinner than recommended to achieve a uniform finish. This reduction in thickness can compromise the barrier's ability to effectively block moisture vapor.
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Adhesion and Longevity: The addition of flakes can also affect the adhesion properties of the MVB. Flakes could create a physical barrier between the MVB and the substrate, leading to potential delamination or reduced bonding strength. This can impact the longevity and durability of the flooring system.
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Aesthetic Considerations: While not directly related to performance, the aesthetic outcome of broadcasting flake into MVB can be unpredictable. The distribution of flakes might be uneven, and the appearance may vary depending on the MVB's color and transparency.
Broadcasting Flake Directly into a Moisture Vapor
Broadcasting flake directly into a moisture vapor barrier streamlines the flooring process by eliminating the need for separate MVB and epoxy base coats. This approach is particularly advantageous for one-day installations. MVBs serve as excellent primers due to their strong adhesion, low viscosity, and rapid drying properties. Compared to polyurea or polyaspartic coatings, MVBs can be more suitable for quick installations because they are less sensitive to moisture.
Addressing Potential Issues When Broadcasting Flake Directly into a Moisture Vapor Barrier
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Maintain Thickness Consistency: Carefully calculate the required MVB thickness, considering the addition of flakes. Apply the MVB in a manner that ensures uniform coverage and thickness.
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Ensuring Strong Adhesion and Longevity: Conduct thorough surface preparation to enhance the bonding between the MVB and the substrate.
- Timing Flake Application: Allowing the MVB to reach a tacky stage before broadcasting the flake can prevent the flake from sinking too deeply into the MVB. This approach ensures the flakes remain more on the surface, creating a more consistent and visually appealing finish. It also helps maintain the integrity of the MVB layer, ensuring it does not become too thin or uneven. Proper timing in this step is crucial and may require some trial and error to determine the optimal tackiness level for the specific MVB product used.
Ultimately the decision of broadcasting directly into a moisture vapor barrier will be dependent on your project. When the MVB is being applied as a preventative measure it raises less concerns and even has several benefits, but careful consideration should be made when a MVB is a necessity due to moisture-related issues.