Screeds used to separate or divide plaster surfaces from other similar materials are called?

Screeds used to separate or divide plaster surfaces from other similar materials are called?

• A. Base screeds
• B. Parting screeds
• C. Base or parting screeds
• D. Expansion screeds

Answer: (C)

Separating layers between plaster and adjacent materials are used to prevent bonding and to define a clear interface. A base screed provides a new bed for plaster, creating a separate surface from the material beneath. A parting screed is specifically a nonbonding layer that stops plaster from sticking to the substrate, allowing for movement and reducing crack transmission. Expansion screeds, by contrast, are intended to accommodate movement at joints in concrete or masonry, not to separate plaster from similar materials. Because both base and parting screeds serve the purpose of separating plaster from other materials, the correct description covers either base or parting screeds.

Separating layers between plaster and adjacent materials are used to prevent bonding and to define a clear interface. A base screed provides a new bed for plaster, creating a separate surface from the material beneath. A parting screed is specifically a nonbonding layer that stops plaster from sticking to the substrate, allowing for movement and reducing crack transmission. Expansion screeds, by contrast, are intended to accommodate movement at joints in concrete or masonry, not to separate plaster from similar materials. Because both base and parting screeds serve the purpose of separating plaster from other materials, the correct description covers either base or parting screeds.