Archived - Standard Industrial Classification - Establishments (SIC-E) 1980

F - Construction Industries

42 - Trade Contracting Industries

While general contractors, in response to market demand, build complete structures classifiable to broad specialization groups, trade contractors are classified by the specific component they contribute to the total structure. The specialized trade contractors are engaged in one aspect common to different structures requiring specialized skills or equipment. Normally they supply the general contractor with their specialized service but in repair construction, and to a lesser degree in new construction, trade contractors are often engaged as "prime contractors", or jobbers, dealing directly with the principals involved. Establishments primarily engaged in maintenance, i.e. cleaning, rather than repair construction are classified in Industry Group 995 - Services to Buildings and Dwellings those primarily engaged in maintenance of highways, streets and bridges are classified in 4591 - Highway, Street and Bridge Maintenance Industry and those primarily engaged in maintaining wharves and docks are classified in 4559 - Other ServiceIndustries Incidental to Water Transport.

425 - Mechanical Specialty Work

Establishments primarily engaged in process piping, automatic sprinkler systems, commercial refrigeration, environmental controls, millwright and rigging, thermal insulation and other mechanical specialty work.

4251 - Process Piping Work

Establishments primarily engaged in the installation and repair of industrial process piping.

4252 - Automatic Sprinkler System Installation

Establishments primarily engaged in the installation and repair of automatic sprinkler fire protection systems. Establishments primarily engaged in installing sprinkler systems for lawns and gardens are classified in 4241 - Plumbing, construction.

4253 - Commercial Refrigeration Work

Establishments primarily engaged in the installation and repair of commercial, industrial and scientific refrigeration and cold storage systems. Establishments primarily engaged in providing a refrigeration service are classified in 4791 - Refrigerated Warehousing Industry.

4254 - Environmental Control Work

Establishments primarily engaged in the installation and repair of central temperature control panels, remote temperature, humidity and smoke detection sensors and related systems and control wiring in multi-unit residential and non-residential buildings.

4255 - Millwright and Rigging Work

Establishments primarily engaged in the hoisting, installation and dismantling of large-scale apparatus and special equipment such as central air conditioning plants, industrial process and materials handling equipment, hydroelectric station and sewage treatment plant components. Establishments primarily engaged in installing elevators and escalators are classified in 4291 - Elevator and Escalator Installation.

4256 - Thermal Insulation Work

Establishments primarily engaged in applying insulation to hot and chilled water pipes, boilers and duct runs. Establishments primarily engaged in insulating wall cavities and attics are classified in 4234 - Insulation Work, construction.

4259 - Other Mechanical Specialty Work

Establishments primarily engaged in mechanical specialty work not elsewhere classified.