Workers in this unit group erect and repair foundations, walls and complete structures of brick, stone and similar materials and cover and decorate walls, ceilings and floors of buildings with tiles and mosaic panels. Their functions include: laying brick, hollow tile and similar building blocks to construct walls, partitions, arches, fireplaces and other structures; laying bricks to construct smoke stacks; laying firebrick or refractory blocks and tiles to build and repair furnaces, converters, kilns and ovens; building stone structures such as walls, piers and abutments; laying walks, kerbs and pavements of stone; setting tiles to surface walls and floors; constructing and laying mosaic panels to decorate floors, walls and other surfaces; performing related tasks.