Which gypsum board is recommended as a base for interior veneer plaster finish?

Which gypsum board is recommended as a base for interior veneer plaster finish?

• A. Green board
• B. Blue board
• C. Red board
• D. Purple board

Answer: (B)

Veneer plaster needs a base that provides a good bonding surface and the right porosity for multiple plaster coats. Blue board is designed specifically as a plaster base, with a surface that promotes strong adhesion and a uniform finish for plaster application. Its facing is prepared to accept plaster well and its texture helps the plaster key properly, reducing cracking and unevenness over time. Other boards are optimized for different uses—green board for moisture resistance in wet areas, red board for fire-rated assemblies, purple board for mold or moisture resistance—none of which are intended to serve as the ideal substrate for interior veneer plaster.

Veneer plaster needs a base that provides a good bonding surface and the right porosity for multiple plaster coats. Blue board is designed specifically as a plaster base, with a surface that promotes strong adhesion and a uniform finish for plaster application. Its facing is prepared to accept plaster well and its texture helps the plaster key properly, reducing cracking and unevenness over time. Other boards are optimized for different uses—green board for moisture resistance in wet areas, red board for fire-rated assemblies, purple board for mold or moisture resistance—none of which are intended to serve as the ideal substrate for interior veneer plaster.