Workers in this unit group perform miscellaneous construction and building maintenance tasks and are not classified elsewhere. Their functions include: performing tasks in several different building trades to build and repair structures such as houses, barns, shops and private garages; maintaining structures such as office buildings, apartment houses, factories and similar establishments in good repair; covering ceilings and interior walls of buildings with wallpaper; performing maintenance, repair or construction work at unusual heights; erecting temporary metal or wooden scaffolding on building sites; demolishing buildings and other structures; laying clay, concrete or cast-iron pipes in ditches to form sewers, drains or water mains or for other purposes; digging wells or deep pits for structural footings; working under water in diving suit or wearing self-contained underwater breathing apparatus to perform duties in construction, maintenance and repair of structures, ships floating docks and harbour installations; laying composition tile floors; cleaning stone, brick and metal structures with sand or steam jet; performing related tasks.