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Air and Waterproof Barrier

Now easier to apply, especially in cold weather.

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Availability: In stock



Prosoco R-Guard Cat 5 is a single component, Silyl-Terminated-Poly-Ether (STPE) that is roller applied to produce a highly durable, seamless, elastomeric weatherproofing membrane on exterior sheathing, CMU back-up walls, and pre-cast concrete.


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.

Prosoco R-Guard Cat 5 is part of the family of Prosoco R-Guard products developed to prevent the movement of water and air through building envelopes. Utilize Prosoco R-Guard Cat 5 as the primary air barrier over above grade structural surfaces prepared with R-Guard Joint & Seam Filler and R-Guard FastFlash

  • Solvent free. Isocyanate free. Phthalate free. Complies with all VOC regulations.
  • Bonds to most common building materials without priming.
  • Bonds and cures in wet weather and on damp substrates.
  • Silane functional polymer provides superior long term adhesion, crack bridging and weathering characteristics.

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