How many Johns Manville plants are there?

Johns Manville has many manufacturing plants across North America, Europe, and Asia, with total number around 40 to 45 plants worldwide as of recent years, though exact number changes due to acquisitions and closures. Johns Manville is major building products company owned by Berkshire Hathaway since 2001, headquartered in Denver, Colorado, producing insulation, roofing, and engineered products. In North America, Johns Manville has about 25 to 30 plants, including insulation plants making fiberglass and mineral wool in locations like Defiance, Ohio, McPherson, Kansas, Scottsboro, Alabama, and Etowah, Tennessee, and roofing plants making bitumen and single-ply membranes. In Europe, Johns Manville has about 10 plants in Germany, Slovakia, and other countries producing glass fibers and nonwovens. In China, it has plants in China for engineered products. The company has grown through acquisitions, so number varies. For example, Johns Manville has insulation plant in Innisfail, Alberta, Canada, making fiberglass batts for Canadian market, plus plants in United States like Pueblo, Colorado. So total Johns Manville plants are approximately 40 plus worldwide, with about 7,000 employees, producing insulation, roofing, and filtration products globally, with majority in US, several in Europe, and few in Asia, making it global manufacturer with extensive plant network.