Work environment is typical of a manufacturing facility; may be exposed to environmental conditions of cold, heat, high noise levels, moving mechanical parts, heights, dust/mist/gas/fumes, extensive walking or climbing, etc. About Us: Johns Manville is a proud member of the Berkshire Hathaway family of companies, serving customers in more than 80 countries, supplying innovative products to the construction, aerospace, automotive, filtration and energy industries.