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Prosoco R-Guard Cat 5 Pail - MasonryDirect.com
Prosoco R-Guard Cat 5 Air and Waterproof Barrier
Prosoco R-Guard Cat 5 Air and Waterproof Barrier
Prosoco R-Guard Cat 5 Air and Waterproof Barrier

Prosoco R-Guard Cat 5 Air and Waterproof Barrier


Regular price $899.99 Sale

Cat 5

PROSOCO R-Guard® Cat 5TM is a fluid applied, waterproofing, and air and water barrier membrane that combines the best of silicone and polyurethane properties. This single component, Silyl-Terminated-Polymer (STP) is roller applied to produce a highly durable, seamless, elastomeric weatherproofing membrane on exterior sheathing, CMU back-up walls, and pre-cast concrete. Cat 5TM is proven to prevent water and air penetration of the building envelope in conditions ranging from everyday weather to the drenching rains and 155 mph winds of a Category 5 hurricane.

Cat 5TM can be applied in unfavorable weather conditions to dry or damp substrates. This feature eliminates many weather-related construction delays and accelerates the “drying in” of new buildings. The durable, elastomeric membrane adheres to most surfaces, is immediately waterproof and is compatible with most sealants and waterproofing or air barrier components.


  • Silane functional polymer provides superior long term adhesion, crack bridging and weathering characteristics. Self seals fastener penetrations.
  • Bonds to most common building materials without priming to produce a durable, weatherproof membrane. Easy to repair if damaged.
  • Will not tear or lose effectiveness when exposed to weather during construction.
  • Bonds and cures in wet weather and on damp substrates.
  • May be fully exposed to UV and weather for up to 12 months depending upon conditions. If longer, contact for inspection.
  • Single component – saves time.
  • Easy roller application in all climates.
  • Breathable. Allows damp surfaces to dry.
  • Compatible with most sealants and waterproofing or air barrier components.
  • Solvent free. Isocyanate free. Phthalate free.
  • No shrinkage. No staining. No yellowing.
  • Will not support mold growth.
  • Stops penetration of air and water under normal and extreme weather conditions.
  • Air Barrier Association of America (ABAA) approved product.
  • Illustrations depicting the use of PROSOCO R-Guard® products are available at www.prosoco.com by downloading the R-Guard Installation Guidelines.


  • Not for use as a liquid flashing membrane. Use R-Guard FastFlash®.
  • Not for use in place of appropriate through-wall flashing. See R-Guard SS ThruWall product literature.
  • Not for use below grade or in locations designed to be continuously immersed in water.


VOC Compliance

R-Guard Cat 5TM is compliant with the US Environmental Protection Agency’s AIM VOC regulations. Visit www.prosoco.com/voccompliance to confirm compliance with individual district or state jurisdictions.


Always read full label and SDS for precautionary instructions before use. Use appropriate safety equipment and job-site controls during application and handling.

24-Hour Emergency Information: INFOTRAC at 800-535-5053