37 installation of drywall, flooring, and ceilings for all types of commercial,industrial, habitational, and government construction; installation of environmental control structures such as clean rooms and other controlled structures; installation of insulation, namely, insulation of mechanical systems including, pipes, ductwork, precipitators, boilers, turbines, tanks, generators, bag houses, scrubbers, AQCS components and other equipment for commercial, industrial, power and process, manufacturing and government construction; installation of insulation of such mechanical systems for nuclear, gas, geothermal, electrical and fossil fuel power plants; installation of insulation of such mechanical systems in refineries and chemical process plants; installation of insulation of such mechanical systems for resource recovery and co generation facilities; installation of insulation of such mechanical systems in ships; installation of insulation, namely, insulation of mechanical systems relating to the construction of cold storage facilities; removal and abatement in the nature of removal of asbestos and lead; building demolition services, excluding customized