This specification covers gypsum sheathing with a water-resistant core, which is designed to be used as a sheathing on buildings.

Formerly under the jurisdiction of Committee C11 on Gypsum and Related Building Materials and Systems, this specification was withdrawn in December 2004 and replaced by Specification C 1396/C 1396M for Gypsum Board.

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1.1 This specification covers gypsum sheathing with a water-resistant core, which is designed to be used as a sheathing on buildings.

Note 1—Specification C 1280 contains application procedures for gypsum sheathing board.

1.2 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.