scope:

This specification describes the minimum requirements for, and the methods of handling, storage, and application of, gypsum sheathing for use as a substrate for exterior claddings.

Exterior claddings shall be provided to protect gypsum sheathing from long-term weather exposure. (See section 6.1 for short-term exposure.)

Exterior claddings and their application methods shall be the responsibility of those making the recommendation. Consult the local building code or cladding manufacturer to determine when a water-resistive barrier is required.

Where fire resistance is required for a system employing gypsum sheathing, details of construction shall be in compliance with listings or reports of tests of systems tested in accordance with ASTM E119 procedures by recognized testing laboratories and shall meet the requirements of the fire rating specified (see Fire Resistance Design Manual, GA-600).

Where a sound control requirement is specified for a system employing gypsum sheathing, details of construction shall be in compliance with listings or reports of tests of systems tested in accordance with ASTM E90 or E336 that meet the requirements of the sound control rating specified (see Fire Resistance Design Manual, GA-600).

Where a racking resistance or wall shear requirement is specified for a system employing gypsum sheathing, details of construction shall be in compliance with reports of tests of systems tested in accordance with ASTM E72 that meet the requirements of the racking or shear value specified by the designer or applicable building code.