Workers apply insulation materials to pipes, tanks, boilers, ducts, refrigeration equipment, and other surfaces requiring thermal temperature control. Workers handle insulation materials made of fiberglass, rubber, calcium silicate, and urethane. Asbestos workers remove asbestos-containing materials. Length of ApprenticeshipThe apprenticeship is a four-year program with the opportunity to advance about every six months. Apprentices must complete a minimum of 88 related classroom hours per year and 8,000 on-the-job training hours. Apprenticeship applicants must be at least 18 years of age. In addition, they must provide proof of high school graduation or general education development (GED) equivalent. Local apprenticeship committees may require additional qualifications. Ohio Wage Averages*Bureau of Labor Statistics, U.S. Department of Labor, Occupational Employment Statistics, [March 31, 2017] [http://www.bls.gov/oes/current/oes472132.htm]