On the surface, roofing contractors all look the same to consumers. After all, nearly every website from contractors promises service, quality and satisfaction from a contractor that has been around for generations with satisfied clients and guarantees of good work. 

Roof consultant Mark Kelly estimates that in the United States alone there are more than 250 billion square feet of residential roofing and over 750 billion square feet of commercial roofing. Kelly has more than 30 years of experience in the design, construction, restoration and preservation of buildings, and his experiences inspired him to write an in-depth look at the U.S. roofing industry.