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Prosoco Vapor-Barrier 5 gallon - MasonryDirect.com
Prosoco Vapor-Barrier 5 gallon - MasonryDirect.com
Prosoco Vapor-Barrier 5 gallon - MasonryDirect.com
Prosoco Vapor-Barrier 5 gallon - MasonryDirect.com

Prosoco R-Guard VB (Vapor Barrier) Fluid-Applied Air & Water-Resistive Barrier and Water Vapor Barrier


Regular price $329.99 Sale

VB (Vapor Barrier)

PROSOCO R-Guard® VB is a fluid-applied air
and water-resistive barrier that stops air and water leakage in cavity wall, masonry veneer construction, as well as in stucco, EIFS and most other building wall assemblies. Once on the substrate, the easily applied liquid quickly dries into a rubberized, highly-durable, water-resistant membrane.

R-Guard VB performs the function of both a vapor barrier and an air/water resistive barrier. Spray- grade R-Guard VB is ideal for special construct types that require protection from the passage

of air, liquid water and water vapor. R-Guard VB reduces heating and cooling costs and lowers the risk of mold and mildew.

Compared to self-adhered or mechanically fastened sheet wraps, easy-to-use R-Guard VB provides superior protection against penetration of liquid water and water vapor. Use R-Guard VB as a high-performing water resistive barrier, vapor barrier, or as part of a continuous building-wide air barrier system. The durable membrane conforms and adheres to common building surfaces and is compatible with most paints, sealants and self- adhered waterproofing or air barrier components.

Appropriate for vertical, above-grade applications to exterior sheathing, CMU, cast concrete and most other common building materials.


  • Reduces condensation and energy loss caused by air leaks through the wall assembly.
  • Minimizes risk of water damage to sheathing and associated repair or replacement costs.
  • Prevents passage of liquid water and water vapor.
  • Fast and easy installation reduces labor costs.
  • No air leakage or water intrusion between the sheathing and R-Guard VB – stable under air and wind pressure loads.
  • Seamless – no tears, holes, or improperly lapped joints to compromise performance.
  • Combines the durability and flexibility of a rubberized coating with the speed and ease of a water-based, fluid-applied application.
  • Won’t tear or lose effectiveness when exposed to weather during construction.
  • May be exposed to weather for up to 6 months without compromising performance, depending upon conditions.
  • Single component. Easy installation. Long pot life. Water cleanup. Low odor. Non toxic.
  • Simplifies inspection and quality control.
  • Compatible with most paints, sealants and coatings.
  • Illustrations depicting the use of PROSOCO R-Guard® products are available at www.prosoco.com by downloading the R-Guard Installation Guidelines.


  • Not for application at surface or air temperatures below 40°F (4°C) or above 110°F (43°C) unless Hot Weather Precautions are followed. See “Surface and Air Temperatures.”
  • Not for use below-grade or in locations designed to be continuously immersed in water.
  • Not for use as an exterior finish.


VOC Compliance

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


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