What type of gypsum board is recommended for use as a base for an interior veneer plaster finish?

The correct choice is blue board. This type of gypsum board is specifically designed to be used as a base for veneer plaster finishes. It features a special moisture-resistant core and is treated to create a suitable surface for the adhesion of thin plaster applications, ensuring a strong bond and a smooth finish.

Regular board lacks the characteristics necessary for effective plaster application because it is not designed for moisture resistance. Green board, while moisture-resistant, is typically used in high-humidity areas such as bathrooms and kitchens but is not the ideal choice for plaster finishes. Type X board, known for its fire-resistant properties, is primarily used where fire-rated assemblies are required, but it does not offer the appropriate surface for plaster like blue board does. Thus, blue board is the optimal choice for achieving the desired results with an interior veneer plaster finish.