ISI Building Products is the manufacturer of Viper® Vapor Barriers. Our products are sold throughout North America and help create healthy, durable, high performance structures. Viper Vapor Barriers provide exceptional defense against moisture migration, vapor drive, and soil gases beneath concrete slabs—helping ensure long‑term protection in residential, commercial and industrial projects. In crawl spaces, Viper products create a continuous moisture barrier that reduces humidity, protects structural components and supports healthier, more energy‑efficient buildings.
Backed by rigorous testing and proven field performance, Viper products are relied on by contractors, builders and specifiers across North America. Visit us at World of Concrete 2026 to explore our full lineup and learn how Viper can elevate your next project from the ground up.