Guardian makes, markets, and moves building materials Guardian Building Products (GBP) is a driving force in the building materials industry. We are made up of two separate and distinct business units. Guardian Building Products Distribution operates one of the largest distribution networks of specialty building products in North America. Guardian Insulation is one of the leading manufacturers of fiberglass insulation. GBP offers a wide array of products and services to more than 5,000 customers in the residential and light commercial construction industries. Learn about our extensive product set and strategic solutions, designed to give you, our customers, a competitive advantage. Business Units Guardian Building Products Distribution We are a premier two-step distributor of specialty distribution products including insulation, roofing, decking, gypsum, siding, millwork, and more. Guardian Insulation We manufacture both low and high density fiberglass insulation as well as produce high quality, laminated blanket insulation for steel and wood frame buildings.