Johns Manville

Johns Manville (JM) is a leading manufacturer of insulation, roofing systems, and engineered products, operating under the Berkshire Hathaway umbrella. Founded in 1858 in New York City, JM has grown to serve customers in over 80 countries, with 44 manufacturing facilities across North America and Europe. The company is headquartered in Denver, Colorado, and employs around 8,000 people. JM specializes in high-performance building materials, including fiberglass, mineral wool, and flexible duct insulation for residential, commercial, and industrial applications. Their roofing systems feature advanced membranes and coatings, while their engineered products include glass fibers for composites and nonwoven materials for various industries. JM caters to sectors such as construction, transportation, and renewable energy, providing tailored solutions for builders, automotive manufacturers, and wind turbine developers. The company emphasizes innovation, sustainability, and community impact, maintaining a strong legacy in the building and industrial markets.