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

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.

421 - Site Work

Establishments primarily engaged in wrecking and demolition, water well drilling, septic systems installation, excavating and grading, equipment rental (with operator), asphalt paving, fencing and other site work.

422 - Structural and Related Work

Establishments primarily engaged in piledriving, form work, steel reinforcing, concrete pouring and finishing, precast concrete installation, rough and framing carpentry, structural steel erection and other structural and related work.

423 - Exterior Close-In Work

Establishments primarily engaged in close-in work such as masonry, siding, glass and glazing work, insulation, roofing and other exterior close-in work.

424 - Plumbing, Heating and Air Conditioning, MechanicalWork

Establishments primarily engaged in mechanical trades such as plumbing, dry heating and gas piping, wet heating and air conditioning, sheet metal and other duct work.

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.

426 - Electrical Work

Electrical Work

427 - Interior and Finishing Work

Establishments primarily engaged in plastering, drywall, acoustical, finish carpentry, painting and decorating, terrazzo and tile, flooring and carpeting and other interior and finishing work.

429 - Other Trade Work

Establishments primarily engaged in the installation of elevators and escalators, ornamental metal, residential swimming pools and other construction work not elsewhere classified.