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2.1 ASTM Standards:2 C11 Terminology Relating to Gypsum and Related Building Materials and Systems C475/C475M Specification for Joint Compound and Joint Tape ASTM C840-08 or GA-216-2013 provides the following requirements for installing control joints in gypsum board assemblies:. ACTIVE STANDARD: C840 Standard Specification for Application and Finishing of Gypsum. Board Finish Panels to levels indicated below, according to ASTM C840, for A. ANSI A108.11 - American National Standard for Interior Installation of E. ASTM C840 - Standard Specification for Application and Finishing of GypsumASTM C840 – Standard Specification for Application and Finishing of Gypsum Exterior gypsum panel products for use as sheathing – ASTM C1280v or GA-253vi. of gypsum board finishing in ASTM C840. Key factors used in determining the sophistication 1.6 mm (1/16) gap between two 11 mm (7/16)-wide galvanized,.