Product details
FX-409 Moisture Vapor Barrier Epoxy Coating – USA
FlexRock FX-409 Moisture Vapor Barrier Epoxy Coating is a high-performance, two-part epoxy moisture barrier engineered to control excessive vapor emissions in concrete substrates. This 100% solids epoxy system forms a dense, impermeable layer that effectively reduces moisture vapor emission rates up to 20 lb/24 hr/1000 ft², making it an ideal floor moisture barrier before installing finish flooring materials.
Designed to meet ASTM F3010 requirements, FX-409 provides reliable epoxy vapor barrier protection when applied at the recommended film thickness—ensuring long-term durability and compliance with flooring and coating industry standards.
✅ Key Features & Benefits
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Proven epoxy moisture barrier that controls vapor emissions up to 20 lb/24 hr/1000 ft²
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Excellent adhesion promotion for concrete substrates
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Meets ASTM F3010 vapor-permeance standards
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Compatible with vinyl, VCT, carpet, terrazzo, wood, and resinous flooring systems
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Enhances bond strength for top-coat or decorative layers
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Easy-to-apply floor moisture barrier epoxy for professional contractors
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100% solids formulation – no VOCs, low odor, eco-friendly application
🏗️ Recommended Applications
FX-409 is ideal for interior horizontal concrete surfaces such as:
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Commercial and industrial concrete floors
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Institutional buildings and basements
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Warehouses, garages, and manufacturing areas
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Moisture-sensitive flooring installations
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Underlayment for epoxy, urethane, or polyaspartic systems
⚙️ Application Instructions
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Prepare the concrete surface by grinding or shot-blasting to achieve CSP 3–5 profile.
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Mix Part A and Part B in equal volumes for 2–3 minutes.
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Apply evenly using a roller or squeegee at the recommended coverage rate.
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Allow the coating to cure fully before installing subsequent flooring layers.
🧪 Technical Highlights
| Attribute | Value |
|---|---|
| Composition | 100% solids epoxy |
| Function | Moisture vapor barrier |
| Compliance | ASTM F3010 |
| Application | Concrete substrates |
| Coverage | 100–150 ft²/gal (varies by porosity) |
🌎 Why Choose FX-409
By reducing vapor transmission and preventing floor coating failures, FX-409 Moisture Vapor Barrier Epoxy ensures maximum adhesion and long-term floor protection. It’s trusted by flooring professionals across Florida, Texas, Washington, Michigan, Los Angeles, New York, and Houston, and throughout North America.
✅ Made in the USA – backed by industry-leading manufacturing and support.
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