CERTAshield™ SA, formally VYCOR® enV-S™, is a fully adhered, vapor-permeable weather-resistive barrier (WRB) designed to help protect residential wall assemblies from wind-driven rain while allowing moisture vapor to escape. Installed behind exterior siding and cladding, it creates a continuous protective layer that helps manage moisture, reduce the potential for water intrusion, and support long-term building envelope performance. Its fully adhered design provides consistent coverage and a durable bond to the substrate, helping create a reliable foundation for siding installation. By combining water resistance with breathability, CERTAshield™ SA helps wall systems dry efficiently and supports healthier, longer-lasting structures. As part of the CertainTeed weather proofing portfolio, CERTAshield™ SA integrates seamlessly with CertainTeed flashing, sealing, insulation, and siding products to help deliver a complete exterior wall system. Ideal for both new construction and...See More remodeling projects, it helps contractors create a protected, high-performing wall assembly while achieving a clean, professional finish behind a variety of siding and cladding materials. See Less