This standard is issued under the fixed designation C 79/C 79M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. | ij Designation C 79 C 79M - 00 Standard Specification for Treated Core and Nontreated Core Gypsum Sheathing Board1 This standard is issued under the fixed designation c IS KC 79M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last rerpprovrl. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope This speciCcation covers Ircnacd core and core gypsum sheathing which is designed to be used as a sheathing on buildings. The values stated in either inch-pound or SI metric units are to be regarded separately as the standard. Within the text the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined. 2. Referenced Documents ASTM Standards C 11 Terminology Relating to Gypsum and Related Building Materials and Systems2 C 473 Test Methods for Physical Testing of Gypsum Board Products and Gypsum Lath2 C 645 Specĩm mìi n lor NonsirLlCtural Sled Framing Mcm-bers2 C 1264 C1264M Specification for Samplíng. Inspcciion. Rejection C. ertiCcarion. Packaging. Marking. Stopping. Handling and Storage of Gypsum Board2 E 119 Test Methods for Fire Tests of Building Construction and Materials3 3. Terminology Definiiions used in ttos specification shanbein aacoo-dance with Terminology C 11. 4. Materials and Manufacture Gypsum sheathing shall consist of a noncombustible core essentially gypsum surfaced on both the face and the back with water-repellent paper bonded to the core. Treated core gypsum sheathing shall have a waterresistant material incorporated into the core. Nontreated core gypsum sheathing shall not be re 1 This specifcation is under the jurisdiction of ASTM Committee C11 on .
