PROSOCO VB Fluid-Applied Air & Water-Resistive Barrier and Water Vapor Barrier

R-GUARD VB (VAPOR BARRIER)

FLUID-APPLIED AIR, WATER, AND VAPOR BARRIER FOR MASONRY AND WALL ASSEMBLIES

R-Guard VB is a high-performance, fluid-applied air and water-resistive barrier and vapor barrier designed to prevent air and moisture infiltration in cavity wall and masonry veneer construction, as well as stucco, EIFS, and most other exterior wall assemblies.

KEY FEATURES

• Dual-purpose performance – Serves as both a vapor barrier and air/water-resistive barrier

• No leakage under pressure – Maintains seal between sheathing and membrane under wind and air loads

• Construction-ready durability – UV- and weather-resistant for up to 6 months of exposure

• Easy application – Spray-grade, fast-drying formula reduces labor time and installation complexity

• Broad compatibility – Adheres to CMU, concrete, sheathing, and most standard wall surfaces

TECHNICAL DATA

• Form: Viscous liquid, mild odor, light green color

• pH: 7.5–10.0

• VOC Content: 45 g/L

• Coverage:

  • Gypsum Board/Plywood: 40–50 sq ft per gallon per coat

  • OSB/CMU: 30–50 sq ft per gallon per coat

• Solids Content: 62.5% (ASTM D2369)

• Weight per Gallon: 11.12 lbs

• Shelf Life: 1 year (sealed)

• Freeze Point: 32°F (0°C)

• Flash Point: Not applicable

SIZES AVAILABLE

• 5-gallon pails

• 55-gallon drums (special order)

PERFORMANCE & COMPLIANCE

• NFPA 285 Compliant Wall Assemblies

• ASTM E 96 – Water Vapor Transmission

• ASTM E 2357 – Air Leakage

• ASTM D 4541 – Adhesion

• ASTM E 84 – Surface Burning Characteristics

TYPICAL USES

Ideal for vertical, above-grade surfaces including:

• Exterior sheathing

• CMU

• Cast-in-place concrete

• Most common building materials

WHY CHOOSE R-GUARD VB

R-Guard VB eliminates the gaps and weaknesses found in traditional sheet wraps by creating a seamless, highly durable membrane that improves building envelope performance. Use it as part of a complete air and moisture management system to reduce energy loss, prevent mold growth, and increase long-term building durability.

RESOURCES

• Product Data Sheet
• Safety Data Sheet
• Safety Data Sheet (Spanish)
• SDS Canadian French
• VOC Compliance
• Product Test Data
• NFPA 285 Compliant Wall Assemblies
• LEED Verification Letter