Guardian Fiberglass :: Home 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: Albion, MI Mineral Wells, MS Inwood, WV Kingman, AZ Winnsboro, SC Erin, Ontario, Canada Each facility has a staff of technical, production, maintenance, shipping, supervisory, and human resources personnel, with administrative responsibilities handled primarily out of the Guardian Building Products Corporate Center in Greenville, SC. Energy Policy Act of 2005 Greenguard Information U.S. Green Building Council (LEED) program Co-op Advertising Claim Form Commercial Fiberglass Warranty Letter of Recycled Content Guardian Fiberglass, Inc., manufactures a complete line of light-density fiberglass building insulation products for the construction markets in the United States and Canada. Primarily branded under the Guardian Fiberglass label, Guardian products are also sold under well-known private brand names including Do It Best and Meeks, with a primary focus on the independent lumber dealer and home center market. Guardian is now the fourth largest manufacturer, and follows aggressive marketing principles. The company has been awarded numerous "Vendor of the Year" designations from major buying group customers. Guardian is known for its positive, hard-working people, entrepreneurial spirit, and commitment to its customers, the independent lumber dealers.