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4221 Concreting Services

This class consists of units mainly engaged in concreting work, concrete pouring or other concrete work on construction projects.

Exclusions / References
Units mainly engaged in

(a) terrazzo laying are included in Class 4243 Tiling and Carpeting Services; and

(b) brick paving are included in Class 4251 Landscaping Services.

4222 Bricklaying Services

This class consists of units mainly engaged in bricklaying or concrete block laying.

Primary Activities
Bricklaying; Concrete block laying; Repair of brickwork; Stonework on construction projects

4223 Roofing Services

This class consists of units mainly engaged in roof tiling.

Exclusions / References
Units mainly engaged in the installation of acoustical and other insulation materials are included in Class 4259 Construction Services n.e.c..

Primary Activities
Roof tiling; Metal roof fixing; Roofing materials installation n.e.c

4224 Structural Steel Erection Services

This class consists of units mainly engaged in the erection (including on-site fabrication) of metal silos, storage tanks or structural steel components for buildings or other structures such as bridges, overhead cranes or electricity transmission towers.

Exclusions / References
Units mainly engaged in the construction of complete structures such as buildings, bridges, towers or oil refinery plant (which incorporate structural steel components) are included in the appropriate classes in Subdivision 41 General Construction.

Primary Activities
Reinforcing steel erection; Silos, metal, erection; Storage tanks, metal, erection; Structural steel erection; Trusses or joists, steel, erection; Welding work on construction projects