Guardian Fiberglass, Inc., manufactures a complete line of light-density fiberglass building insulation products for the products construction markets. Guardian Fiberglass first started manufacturing fiberglass insulation products in 1980 and sales have grown annually since production began.

As the manufacturing arm of Guardian Building Products, Guardian Fiberglass produces fiberglass insulation at strategically located facilities in North America. Kingman, AZ is home to one of their manufacturing plants.