Shout it from the rooftops, CentiMark is one of the largest commercial and industrial roofing contractors in North America. The company provides roof installation, inspection, repair, and emergency leak service. CentiMark typically works on flat roofs using EPDM rubber, thermoplastic, bitumen, metal, and coatings. Top customers include NASA and the US Army Corps of Engineers. Its QuestMark division offers commercial, industrial, and retail flooring, do-it-yourself products, and floor maintenance and cleaning products. Chairman and CEO Edward Dunlap founded CentiMark as an industrial cleaning business in 1967. The company, which has about 70 offices throughout North America, is owned by its employees.