Structural · S-D86AW

Vertical Compression Strut Lengths for Suspended Ceiling Bracing

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Seismic bracing for a suspended acoustical ceiling grid consists of a vertical compression strut made from electrical metallic tubing held tight to the structure above with a slotted fit over the T-bar. A twelve gauge vertical hanger wire runs within the conduit and is secured to the main runner below. Four-way twelve gauge diagonal brace wires extend at a maximum angle of forty-five degrees to the ceiling plane, parallel to intersecting components at the brace location. The ceiling grid consists of main runners spaced at forty-eight inches on center and cross tees at twenty-four inches on center. A sizing schedule defines maximum lengths for different conduit diameters, allowing five feet ten inches for half-inch diameter, seven feet eight inches for three-quarter-inch diameter, and nine feet nine inches for one-inch diameter electrical metallic tubing.

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