Architectural · A-WGYMS

Suspended Gypsum Board Seismic Bracing

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Seismic bracing and suspension framing for a gypsum board ceiling assembly. The grid consists of main runners spaced at four feet on center with seven-eighths inch by twenty-five gauge cross-furring spaced at sixteen inches on center, supporting one layer of five-eighths inch gypsum board. Vertical support is provided by number nine gauge vertical hanger wires at three feet on center and twelve gauge vertical hanger wires at four feet each way, featuring a minimum of three tight turns in one and a half inches at both ends. Seismic restraint is achieved using four twelve gauge splayed bracing wires, with two running parallel and two perpendicular to the main runners, secured with a minimum of four tight turns in one and a half inches. A vertical compression post and compression strut are installed at each set of bracing wires, positioned a maximum of two inches from the bracing wires, cross runners, and compression struts. The compression post supplements rather than replaces the hanger wires, and the compression strut is kept clear of penetrating the acoustic ceiling assembly.

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