For years, GreenFiber's cellulose insulation products have been the industry leaders for consistent quality, thermal performance and cost-effective R-values. With the broadest product line in the cellulose category, GreenFiber has specific products to suit the many different needs of the Design/Specify/Build community. As North America's largest cellulose insulation producer, GreenFiber products are available throughout the U.S. and Canada. Plus, GreenFiber is the only cellulose manufacturer capable of providing design and technical support services, and application assistance. GreenFiber products are used extensively in single and multi-family residential as well as light commercial buildings.