FLUID-APPLIED AIR AND WATER-RESISTIVE BARRIER FOR RAIN SCREEN CONSTRUCTION
Cat 5 rain screen is a high-performance, fluid-applied membrane that delivers exceptional air and water protection behind open-jointed or vented rain screen cladding. Applied with a sprayer or roller, it forms a seamless, elastomeric barrier that resists extreme weather—including conditions equivalent to a Category 5 hurricane. Cat 5 Rain Screen is ideal for above-grade wall assemblies and performs reliably on dry or damp substrates, helping to eliminate weather-related construction delays.
KEY FEATURES
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Strong durable protection – withstands extreme weather, including 155-mph winds
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Can be sprayed or rolled – speeds up installation and ensures full coverage
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Bonds to damp substrates – installs even in wet conditions without delay
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Creates a seamless membrane – no laps, gaps, or fastener penetrations
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Self-seals around fasteners – eliminates leaks and maintains performance
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Meets highest code & air tightness standards – ABAA certified and NFPA 285 compliant
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Solvent-free – safe for indoor and outdoor applications
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Phthalate-free – healthier and more sustainable choice
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VOC-compliant – less than 30 g/L VOC content
SUSTAINABILITY & CERTIFICATIONS
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Declare Label – Red List Free
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SCS Certified
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LBC Red List Conformant
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ABAA Certified
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NFPA 285 Compliant
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Complies with ASTM E 96, E 2178, E 2357, D 1970, D 4541, E 84, D 2247, E 331, E 1233, E 72, AATCC-127, C 1305, NFPA 268
TECHNICAL DATA
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Shelf life – 1 year (unopened)
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VOC content – <30 g/L
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Form – viscous liquid, dark bronze color
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Coverage rate –
• Exterior Gypsum, OSB, Plywood: 50–100 sq ft/gal
• CMU: 50–80 sq ft/gal
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Flash point – >200° F (93° C)
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Total solids – 99%
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Weight per gallon – 11.3 lbs
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Available sizes – 5-gallon pail
OVERVIEW
Cat 5 Rain Screen is a silyl-terminated polymer (STP) that combines the flexibility of silicone with the strength of polyurethane. Designed for pressure-equalized rain screen systems, it offers superior adhesion, crack bridging, and long-term weather resistance. Its ability to bond to common building materials—without primer, and even in wet weather—makes it a go-to solution for contractors seeking speed, simplicity, and proven performance.
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