Workers in this minor group erect and repair buildings and other structures. They lay bricks, stones and tiles; erect reinforced concrete frameworks; cover roof frameworks with roofing tiles and other materials; make, erect, fit and repair wooden structural frameworks, flooring, fixtures, panelling, boats, plain furniture, and other objects of wood; apply lath and plasters in buildings; apply insulating materials to buildings, boilers, pipes, refrigeration and air-conditioning equipment; fit and set glass in buildings and vehicles; perform other tasks related to building and construction. Plumber and pipe fitters, Welders and flame-cutters, Sheet-metal workers and Structural metal preparers and erectors are classified in minor group 8-7, Crane and hoist operators and Earth-moving and related machinery operators in minor group 9-7, and Building painter in 9-31.20.