Established in 2000 and headquartered in Charlotte, N.C., Greenfiber is the largest manufacturer of cellulose insulation and fire and sound products. With manufacturing plants located throughout the United States, Greenfiber products are sold to contractors and building supply retailers in the U.S. and Canada. For more information on Greenfiber, call customer service at 800-228-0024 or visit www.greenfiber.com.