Finish coat materials commonly used for plastering include which of the following?

Finish coat materials commonly used for plastering include which of the following?

• A. Portland cement-based plaster
• B. Lime-putty
• C. Gypsum-based finish plasters
• D. All of the above

Answer: (D)

Finish coats in plastering come in several material families, each chosen for how it behaves with the backing and the environment. Cement-based finish coats are durable and moisture resistant, making them a solid choice for exterior stucco and interiors with higher humidity or exposure. Lime-based finishes, including lime-putty mixes, are highly breathable and flexible, which helps on historic or breathable walls and in climates where moisture management is important. Gypsum-based finish plasters provide a very smooth interior surface with a fast set, ideal for dry, stable interior walls. Because all three types are commonly used in different plastering systems, the best answer is that finish coat materials can be cement-based, lime-based, or gypsum-based. The choice depends on the substrate, climate, and performance needs of the project, but all are valid finish coat options.

Finish coats in plastering come in several material families, each chosen for how it behaves with the backing and the environment. Cement-based finish coats are durable and moisture resistant, making them a solid choice for exterior stucco and interiors with higher humidity or exposure. Lime-based finishes, including lime-putty mixes, are highly breathable and flexible, which helps on historic or breathable walls and in climates where moisture management is important. Gypsum-based finish plasters provide a very smooth interior surface with a fast set, ideal for dry, stable interior walls. Because all three types are commonly used in different plastering systems, the best answer is that finish coat materials can be cement-based, lime-based, or gypsum-based. The choice depends on the substrate, climate, and performance needs of the project, but all are valid finish coat options.