National Gypsum is one of the largest gypsum board producers in the world. Headquartered in Charlotte, NC, the company is a full-line supplier, recognized in the industry for customer service and product quality. Gypsum board is the company's primary product, and National Gypsum is the second largest producer in the United States. The company has 17 operating gypsum board plant locations strategically located near metropolitan areas. National Gypsum's gypsum board is marketed under the Gold Bond® BRAND. National Gypsum has six plants producing interior finishing products under the ProForm® BRAND. The primary product is joint compound which you may hear called "ready mix" or "drywall mud". Cement board, marketed under the PermaBase® BRAND, is the company's third business line. Cement board is produced in four plants, and is used primarily as an underlayment for tile walls, floors and countertops.