Johns Manville, a Berkshire Hathaway company, is a leading manufacturer andmarketer of premium-quality building insulation, commercial roofing, roof insulation, and specialty products for commercial, industrial, and residential applications. JM's product offerings include: Formaldehyde-free fiber glass building insulation, commercial roofing membranes and roof insulations, filtration media, and mats and reinforcements.<br /><br />Johns Manville
