North American Industry Classification System (NAICS) 1997

2322 - Building Structure Work

This industry group comprises establishments primarily engaged in erecting the basic structure of buildings by pouring concrete; framing with lumber; welding, bolting or tying steel; and placing precast or pre-stressed concrete members. Crane rental services with operator are also included because they support the erection process.

23221 - Forming Work

This industry comprises establishments primarily engaged in placing and stripping wooden or steel forms for poured-in-place concrete or installing insulated foundation systems. Establishments primarily engaged in erecting falsework used to support concrete until it sets are also included.

  • Exclusion(s):

    Establishments primarily engaged in:

    • installing rigid foam insulation as an incidental activity of sealing and coating foundations (See 23229 Other Building Structure Work)

23222 - Concrete Pouring and Finishing Work

This industry comprises establishments primarily engaged in pouring or gunning concrete, and concrete finishing.

  • Exclusion(s):

    Establishments primarily engaged in:

    • concrete sealing, coating, waterproofing or damp-proofing (See 23229 Other Building Structure Work)
    • paving with concrete (See 23292 Residential and Commercial Paving Contracting)

23223 - Structural Steel and Precast Concrete Erection Work

This industry comprises establishments primarily engaged in structural and related steel erection by welding, rivetting or bolting purchased fabricated parts; installing precast and manufactured concrete panels and other concrete shapes, such as pre-stressed concrete beams, precast stairs and precast balconies; and placing and tying steel reinforcing rods or bars for reinforced concrete.

23224 - Crane Rental Services

This industry comprises establishments primarily engaged in renting cranes with operators. The crane operator takes direction from the contractor responsible for the building erection work, when hoisting steel beams, concrete or other materials.

23225 - Framing and Rough Carpentry Work

This industry comprises establishments primarily engaged in structural wood framing and sheathing, installing prefabricated wooden roof trusses, exterior and interior wall components, and other related carpentry work. While carpenters work mainly with wood, other materials may also be used, such as steel wall studs.

  • Exclusion(s):

    Establishments primarily engaged in:

    • finish carpentry (See 23246 Finish Carpentry and Wood Flooring Work)

23229 - Other Building Structure Work

This industry comprises establishments, not classified to any other industry, primarily engaged in building structure work.

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