General Construction:

• GA Asphalt, Bitumen & Concrete Construction
• GA-1 Streets, Roads & Highways, including Tunnels, Parking Lots, Alleys, Seal coat and Surfacing
• GA-2 Maintenance & Repairs
• GA-3 Curbs, Gutters & Culverts
• GA-4 Striping
• GA-5 Highway Signs & Guard Rails
• GA-98 Includes all of the above sections

Building Construction:

• GB-2 Residential Building
• GB-98 General Building

Fixed Works:

• GF-1 Airports
• GF-2 Bridges
• GF-3 Canals, Reservoirs or Irrigation Systems
• GF-4 Drainage or Flood Control Systems
• GF-5 Recreation Areas
• GF-6 Railroad & Tunnel Construction
• GF-7 Tanks & Towers
• GF-8 Transmission Lines, Tanks & Substations (non-elec.)
• GF-9 Utility Lines (sewage, natural gas, water, & underground telephone cables)
• GF-98 Includes all above sections

Building Specialty:

• GS-1 Acoustical/Insulation, Urethane Foam
• GS-2 Awnings & Canopies
• GS-3 Ceramic Tile, Marble & Teffazzo
• GS-4 Concrete, Cement, Walkways & Driveways
• GS-5 Demolition
• GS-6 Door Installation
• GS-7 Drywall - Installation & Texture
• GS-8 Earth moving, Excavating & Ditching
• GS-9 Elevators, Escalators, Conveyers, etc.
• GS-10 Fencing
• GS-11 Fixtures, Cabinets, & Millwork
• GS-12 Floor Covering, Seamless & Wood Floors, & Finish
• GS-13 Framing
• GS-14 Glazing, Weather stripping, Storm Doors & Window Installation
• GS- 15 Cassions, Piers & Pile Driving
• GS-16 Masonry
• GS-17 Ornamental Iron & Welding
• GS-18 Painting & Decorating
• GS-19 Remodeling
• GS-20 Trenching & Backhoe Owner/Operator
• GS-21 Roofing
• GS-22 Sandblasting
• GS-23 Sign Construction (non-electrical)
• GS-24 Structural Steel Erection
• GS-25 Swimming Pools (non mechanical/electrical)
• GS-26 Vaults & Depositories
• GS-28 Gunite
• GS-29 Various Specialties
• GS-30 Plastering, Stucco, & Lathing
• GS-31 Siding
• GS-32 Sheet Metal
• GS-34 Concrete Coring, Drilling, & Slab Sawing

Electrical Classifications:

• EE-1 Residential Wiring
• EE-98 Electrical (includes EE-1 and ES Specialties)
• EL-1 Electrical Distribution Systems, including Transmission Lines

Electrical Specialty:

• ES-1 Electrical Signs & Outline Lighting
• ES-2 Cathodic Protection
• ES-3 Sound, Intercommunication & Electrical Alarm Systems
• ES-4 Electrical Traffic Control Systems
• ES-5 Microwave Communications Systems
• ES-6 Cable TV
• ES-7 Telephone Communication Systems
• ES-8 Telephone Interconnect Systems

Mechanical Classifications:

• MM-1 Plumbing
• MM-2 Natural Gas Fitting
• MM-3 Air Conditioning & Ventilation
• MM-4 Heating, Cooling & Process Piping
• MM-98 Mechanical (covers MM-1-4)

Mechanical Specialty:

• MS-1 Residential Plumbing
• MS-2 Residential Natural Gas Fitting
• MS-3 Cesspools, Septic Tanks or Sewers
• MS-4 Appliance Installation & Service
• MS-5 Evaporative Coolers
• MS-6 Lawn Sprinklers
• MS-7 Swimming Pool Piping
• MS-8 Water Conditioners
• MS-9 Refrigeration
• MS-10 Boiler Installation, Repair & Service
• MS-11 Controls (mechanical systems)
• MS-12 Fire Protection Sprinkler Systems
• MS-13 Pneumatic Tube Systems
• MS-14 Dry Chemical Fire Protection