Architectural · A-45PCM

Suspended Gypsum Seismic Bracing

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Seismic bracing requirements apply to a suspended gypsum board ceiling grid supported by main runners at four feet on center and cross-furring at sixteen inches on center with one layer of five-eighths-inch gypsum board. Vertical hanger wires of nine gauge are spaced at three feet on center, supplemented by twelve gauge vertical hanger wires at four feet each way with a minimum of three tight turns in one and one-half inches at both ends. Four twelve gauge splayed bracing wires are oriented two parallel to and two perpendicular to the main runners at a maximum forty-five-degree angle, requiring a minimum of four tight turns in one and one-half inches at both ends connected to the main runner. A vertical compression post and compression strut are positioned within two inches of the bracing wires and cross runner, with the compression post serving alongside but not replacing the hanger wires while remaining clear of any acoustic ceiling assembly.

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