Architectural · A-TS36Z

Two-Hour Horizontal Gypsum Duct Enclosure Above Ceiling

Materials

Timber / Wood Metal (misc.)Gypsum / Drywall

Elements

Walls Ceilings Bracing Waterproofing / Flashing

About this detail

This two-hour horizontal gypsum duct enclosure detail is constructed per Progressive Engineering Report AER-09038 and USG Shaft Wall Systems folder SA-926 for ceiling membrane details. The perimeter utilizes a minimum 2-1/2-inch deep, 24-gauge J-runners attached horizontally to the boundary wall with power-actuated fasteners. Three layers of 1/2-inch minimum Firecode C core gypsum panels attach to the underside ceiling side of the assembly. The base layer is secured with 1-inch long Type S screws spaced at 24 inches on center. The second layer uses 1-5/8-inch long Type S screws spaced at 12 inches on center with all joints staggered 24 inches on center from the base layer. The face layer is attached perpendicular to the C-H studs with 2-inch long Type S screws spaced at 12 inches on center with joints staggered 24 inches on center from the base layer. Six-inch C-H studs are installed perpendicular to the J-runners at 24 inches on center, with the C-section facing downward toward the corridor side and fastened with two 1/2-inch long Type S-12 screws, one on each side. A 1-inch thick gypsum liner panel is friction-fitted into the H portion of the C-H studs. Metal bracing is provided per referenced plan layout details.

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