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GCP Applied Technologies (Formerly Grace) Vycor enV-S sheet applied, vapor permeable weather resistive barrier consists of a unique breathable carrier film coated with an adhesive that is specially designed to maintain vapor permeability.


Product Data Sheet


Keeping walls dry is the key to preventing rot of structural elements and mold growth. Vycor enV-S fully-adhered barrier protects against wind driven rain. Vycor enV-S vapor permeable membrane allows the wall system to “breathe”, and water vapor to escape.

Unlike conventional building wraps, installation of Vycor enV-S weather resistive barrier requires no mechanical fastening, and it seals around nails used to install siding and other wall elements. This results in exceptionally low levels of air leakage, and improved energy efficiency of the building.



  • Fully-adhered—installation requires no mechanical fasteners or taping of seams
  • Water resistive—forms a fully adhered barrier against wind driven rain
  • Vapor permeable—“breathable” membrane prevents moisture from becoming trapped in the wall cavity and provides walls the ability to dry
  • Air resistive—greatly reduces air leakage and helps improve building energy efficiency
  • Strong adhesion—to unprimed plywood and oriented strandboard (OSB).
  • Controlled thickness—factory made sheet ensures consistent, non-variable site application
  • Lightweight—allows for easy handling and installation
  • Installation flexibility—may be exposed up to 90 days
  • System solution—when used in combination with Grace Vycor Flashings 

Principal Applications

Vycor enV-S water and air resistive barrier can be used for new and remedial residential construction applications. It is installed onto exterior wall substrates and behind the exterior siding or cladding. 

System Components

  • Vycor enV-S Weather Resistive Barrier—for use on above-grade walls at installation temperatures above 40°F (5°C)
  • Vycor Plus—heavy duty rubberized asphalt based membrane for flashing around windows and doors
  • Perm-A-Barrier Primer Plus—waterbased vapor permeable primer used when adhesion appears to be marginal. • Sealants — refer to Technical Letter 1 for details on compatible waterproofing sealants



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