What do they do at Johns Manville?

At Johns Manville, they manufacture building products including insulation, roofing, and engineered materials for construction and industrial markets, with focus on energy efficiency, fire safety, and sustainability, operating as global manufacturer owned by Berkshire Hathaway. At manufacturing plants like Defiance, Ohio, McPherson, Kansas, Scottsboro, Alabama, Etowah, Tennessee, and Innisfail, Alberta, Canada, workers make fiberglass insulation by melting recycled glass and sand at high temperatures, spinning into fibers, and forming into batts, rolls, and blown-in insulation for walls and attics, with formaldehyde-free binder technology. In roofing plants, they produce TPO and EPDM single-ply roofing membranes, bitumen sheets, and polyiso insulation for flat commercial roofs used on schools, warehouses, and hospitals, ensuring waterproofing and energy efficiency. In engineered products division, they make glass fibers for composites used in automotive parts, wind turbine blades, and building materials, plus filtration media for air and liquid filtration systems. Corporate employees in Denver headquarters handle R&D, sales, marketing, and management. They also focus on sustainability, recycling, and safety. Historically, they made asbestos products until 1980s, but now asbestos-free. So at Johns Manville, they do manufacturing of insulation and roofing, R&D for building materials, sales to contractors and retailers like Home Depot, and operate 40 plus plants worldwide with 7,000 employees generating about 3.5 billion revenue.