Johns Manville Roofing Systems, headquartered in Denver, Colorado, is a diversified manufacturer of roofing products and systems. JM combines over 140 years of experience with the industry's most comprehensive product line and service capability to meet the needs of today's commercial roofing markets.

Manville is now the largest manufacturer of PVC roofing materials in North America. The wide selection of membranes and roofing systems makes Manville the roofing system of choice for companies such as Sears, Roebuck & Company and Dana Corporation.