Guardian Building Products, Inc. (GBP), based in Greenville, South Carolina, is one of the largest building products distribution networks in the United States and through one of its subsidiaries, Guardian Fiberglass, Inc., manufactures a complete line of light density fiberglass insulation products for the residential and commercial construction markets in Canada and the United States. Guardian Fiberglass is the fourth largest producer of light density fiberglass insulation in North America.
