Terrazzo Workers and Finishers

Apply a mixture of cement, sand, pigment, or marble chips to floors, stairways, and cabinet fixtures to fashion durable and decorative surfaces.

Job Task

• Position and secure moisture membrane and wire mesh prior to pouring base materials for terrazzo installation.
• Spread roofing paper on surface of foundation, and spread concrete onto roofing paper with trowel to form terrazzo base.
• Spread, level, and smooth concrete and terrazzo mixtures to form bases and finished surfaces, using rakes, shovels, hand or power trowels, hand or power screeds, and floats.
• Sprinkle colored marble or stone chips, powdered steel, or coloring powder over surface to produce prescribed finish.
• Wash polished terrazzo surface, using cleaner and water, and apply sealer and curing agent according to manufacturer's specifications, using brush or sprayer.
• Wet surface to prepare for bonding, fill holes and cracks with grout or slurry, and smooth, using trowel.
• Build wooden molds, clamping molds around areas to be repaired, and setting up frames to the proper depth and alignment.
• Chip, scrape, and grind high spots, ridges, and rough projections to finish concrete, using pneumatic chisel, hand chisel, or other hand tools.
• Clean chipped area, using wire brush, and feel and observe surface to determine if it is rough or uneven.
• Clean installation site, mixing and storage areas, tools, machines, and equipment, and store materials and equipment.
• Cut out damaged areas, drill holes for reinforcing rods, and position reinforcing rods to repair concrete, using power saw and drill.
• Blend marble chip mixtures and place into panels, then push a roller over the surface to embed the chips.
• Cut metal division strips and press them into the terrazzo base wherever there is to be a joint or change of color, to form desired designs or patterns, and to help prevent cracks.
• Grind curved surfaces and areas inaccessible to surfacing machine, such as stairways and cabinet tops, with portable hand grinder.
• Grind surfaces with a power grinder and polish surfaces with polishing or surfacing machines.
• Measure designated amounts of ingredients for terrazzo or grout according to standard formulas and specifications, using graduated containers and scale, and load ingredients into portable mixer.
• Mix cement, sand, and water to produce concrete, grout, or slurry, using hoe, trowel, tamper, scraper, or concrete-mixing machine.
• Modify mixing, grouting, grinding, and cleaning procedures according to type of installation or material used.
• Mold expansion joints and edges, using edging tools, jointers, and straightedges.
• Fill slight depressions left by grinding with a matching grout material, and then hand trowel for a smooth, uniform surface.
• Move terrazzo installation materials, tools, machines, and work devices to work areas, manually or using wheelbarrow.
• Precast terrazzo blocks in wooden forms.
• Produce rough concrete surface, using broom.
• Remove frames once the foundation is dry.
• Signal truck driver to position truck to facilitate pouring concrete, and move chute to direct concrete on forms.
• Wet concrete surface, and rub with stone to smooth surface and obtain specified finish.

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