Terrazzo screeds must be made of which materials?

Terrazzo screeds must be made of which materials?

• A. Non-ferrous metal
• B. Galvanized steel
• C. Both non-ferrous metal and galvanized steel
• D. Wood

Answer: (C)

Terrazzo screeds are used to define and hold the final thickness and edge of the terrazzo setting bed, so they must be rigid, durable in contact with limey cement, and easy to remove without damaging the surface. Metal screeds meet these needs because they stay straight under load and resist moisture and the alkaline mix. Non-ferrous metal is favored because it won’t rust or corrode in the cementitious environment, helping prevent staining and edge degradation over time. Galvanized steel is also acceptable since the zinc coating protects the steel from rust, providing the same rigid, stable edge while offering good durability in this setting. Wood is not suitable due to swelling, warping, and imprinting on the terrazzo surface. So, screeds can be made from either non-ferrous metal or galvanized steel.

Terrazzo screeds are used to define and hold the final thickness and edge of the terrazzo setting bed, so they must be rigid, durable in contact with limey cement, and easy to remove without damaging the surface. Metal screeds meet these needs because they stay straight under load and resist moisture and the alkaline mix.

Non-ferrous metal is favored because it won’t rust or corrode in the cementitious environment, helping prevent staining and edge degradation over time. Galvanized steel is also acceptable since the zinc coating protects the steel from rust, providing the same rigid, stable edge while offering good durability in this setting. Wood is not suitable due to swelling, warping, and imprinting on the terrazzo surface.

So, screeds can be made from either non-ferrous metal or galvanized steel.