VB Vapor Barrier | Fluid-Applied Air & Vapor Barrier
VB Vapor Barrier by PROSOCO is a fluid-applied, high-performance membrane designed to prevent air and water leakage in cavity walls, masonry veneer systems, and stucco applications. This single-component system serves as both a water-resistive barrier and a vapor barrier, ensuring superior protection from moisture intrusion while promoting energy efficiency. The product applies as a viscous, light green liquid and quickly dries into a rubberized, durable, and low-odor coating.
Product Description
VB Vapor Barrier delivers exceptional defense against wind-driven rain and air leakage, even under high pressure. Unlike traditional sheet wraps, this spray-grade solution provides a seamless membrane that adapts to complex geometries and rough substrates without tearing or lapping issues. It adheres to most common building surfaces including CMU, OSB, concrete, and gypsum board, making it a flexible and reliable option for commercial and residential construction projects.
Key Benefits of VB Vapor Barrier
- Dual-performance: functions as both a water-resistive and vapor barrier
- Fast and easy spray application reduces labor costs
- Resists tearing and weather damage for up to 6 months during construction
- VOC content of 45 g/L ensures compliance with regulatory standards
- Compatible with most paints, sealants, and self-adhered membranes
Common Applications
- Cavity walls in masonry veneer systems
- Stucco assemblies and exterior gypsum sheathing
- Above-grade walls in CMU and cast concrete
- Vertical walls exposed to prolonged construction weather conditions
Storage & Packaging
VB is available in 5-gallon and 55-gallon containers. It has a 1-year shelf life when stored tightly sealed. The product’s mild-odor, light green formulation is user-safe and remains stable under wind and air pressure loads.
Product Properties
| Property | Value |
|---|---|
| Shelf Life | 1 year in tightly sealed, unopened container |
| VOC Content | 45 g/L |
| Form | Viscous liquid, mild odor, light green color |
| pH | 7.5–10.0 |
| Coverage Rate | Gypsum/Plywood: 40–50 sq ft/gal per coat; OSB/CMU: 30–50 sq ft/gal per coat |
| Freeze Point | 32°F (0°C) |
| Flash Point | Not applicable |
| Total Solids | 62.5% (ASTM D 2369) |
| WT/GAL | 11.12 lbs |
| Sizes | 5-gal, 55-gal |
For open-jointed or vented rain screen applications, explore Cat 5 Rain Screen. For more product data and approvals, visit PROSOCO’s official site.
