PROSOCO Cat 5 Air & Waterproof Barrier

STRONG, SEAMLESS PROTECTION AGAINST THE ELEMENTS

Cat 5 is a single-component, silyl-terminated polymer (STP) air and waterproof barrier that’s applied with a sprayer or roller to create a seamless, highly durable elastomeric membrane. Designed for use on exterior sheathing, CMU backup walls, and precast concrete, Cat 5 prevents air and water penetration—even under the extreme 155-mph winds of a Category 5 hurricane. Use Cat 5 as the primary air barrier over above-grade structural surfaces prepared with PROSOCO Joint & Seam Filler and FastFlash.

Cat 5 is solvent-free, phthalate-free, and isocyanate-free, and complies with all VOC regulations.

KEY FEATURES

• Strong durable protection – protects building envelope from air and moisture intrusion

• Can be sprayed or rolled – allows quick, efficient installation in the field

• Creates seamless membrane – eliminates gaps and weak points

• Bonds to damp substrates – reliable adhesion even in wet conditions

• Self-seals around fasteners – enhances long-term weatherproofing performance

• VOC compliant – solvent-free and safe for sensitive job sites

• Phthalate-free & isocyanate-free – no harmful plasticizers or reactive chemicals

• Meets top air barrier standards – NFPA 285, ABAA, ASTM E 2357, and more
  

COMMON APPLICATIONS

• Over exterior gypsum, OSB, plywood

• On CMU walls and precast concrete

• As part of a complete PROSOCO R-Guard air barrier system

TECHNICAL DATA

• Form – Viscous liquid, light brown, mild odor

• Shelf life – 1 year (unopened)

• Coverage rate

  • Gypsum/OSB/Plywood: 50–100 sq ft/gal

  • CMU: 50–80 sq ft/gal

• VOC content – <30 g/L

• Total solids – 99%

• Wt/gal – 11.3 lbs

• Flash point – >200° F (>93° C)

• Available sizes – 5-gallon pail

CERTIFICATIONS & STANDARDS

• Declare Label

• LBC Red List Conformant

• ABAA Certified

• NFPA 285 Compliant Wall Assemblies

• SCS Indoor Advantage Gold

• ASTM E 2357 | E 96 | E 331 | E 1233 | E 72 | E 2178 | E 84 | D 1970 | D 2247 | D 4541 | C 1305

• NFPA 268

• AATCC-127

RESOURCES

• Product Data Sheet
• Product Data Sheet (Canadian French)
• Product Data Sheet (Spanish)
• Safety Data Sheet
• Safety Data Sheet (Spanish)
• SDS Canadian French
• VOC Compliance
• ABAA Certification
• Product Test Data
• ICC-ES Report
• NFPA 285 Compliant Wall Assemblies
• LEED Verification Letter
• SCS Certification
• Declare Label
• LBC Red List Conformant Product Summary