Johns Manville, a Berkshire Hathaway company, is a leading manufacturer and marketer of premium-quality building insulation, commercial roofing, and specialty products for commercial, industrial, and residential applications. Johns Manville has revolutionized the building insulation industry by introducing an entire line of formaldehyde-free fiber glass building insulation. Johns Manville manufactures and markets commercial roofing systems including built up roofing, modified bitumen roofing, EPDM, PVC and TPO membranes as well as high thermal polyisocyanurate roof insulation and low thermal roof perlite roof insulation and a wide variety of roof accessory items.
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