Where is Johns Manville insulation made?

Johns Manville insulation is made in the United States, primarily in its network of fiberglass manufacturing plants spread across the country. Johns Manville is an American company founded in 1858 and owned by Berkshire Hathaway since 2001. It operates several large insulation plants. Its major fiberglass insulation manufacturing facilities are located in McPherson, Kansas, which is one of the largest fiberglass plants in North America, Defiance, Ohio, which produces fiberglass batts and rolls, and Winder, Georgia. It also produces mineral wool and other insulation products in other locations. For example, its pipe insulation and high-temperature insulation is made in other specialized plants. The company sources raw materials like sand, recycled glass, and basalt rock domestically. Most Johns Manville residential fiberglass products sold at Home Depot, Lowe's, and lumber yards are labeled Made in the USA. Some Johns Manville engineered products and accessories may be sourced globally, but the core fiberglass batt, roll, and blown-in products for homes are manufactured in the US to meet ASTM standards. This domestic manufacturing is part of why the company emphasizes quality control, GREENGUARD Gold certification for low emissions, and formaldehyde-free bio-based binders in its climate Pro and ComfortTherm lines.