E. W. Olson Roofing is a division of Combined Roofing Services, LLC. E. W. Olson Roofing and American Roofing & Repair combin ... ed assets in 2008 to become one of the largest roofing companies in the Midwest built upon their reputation of customer satisfaction since 1891. We are a full service commercial roofing company including new construction, re-roofing, garden roofs, waterproofing, maintenance & repair service, and sheet metal. read more