Suspended ceiling framing plan showing main runners consisting of one-and-a-half-inch cold-rolled channels spaced at four feet on center. Cross runners are twenty-five gauge seven-eighth-inch hat channels at gypsum board ceilings spaced at twenty-four inches on center, or one-inch C-channels at plaster ceilings spaced at two feet on center. Nine-gauge vertical hanger wires are spaced at three feet on center at each main runner. Twelve-gauge perimeter hangers are located at terminal ends of each main runner and cross tee unless otherwise noted. Four-way forty-five-degree diagonal twelve-gauge wire bracing and compression posts are required at one every one hundred forty-four square feet maximum, beginning at four feet maximum from perimeter walls in rooms exceeding one thousand square feet. Additional twelve-gauge minimum wire is provided at opposing corners of light fixtures.
NOTES: 1)* MAX. DISTANCE TO FIRST BRACING POINT. 2) PROVIDE COUNTER SLOPING WIRES FOR VERTICAL HANGER WIRES MORE THAN 1 IN 6 OUT-OF-PLUMB 3) ATTACH EA. VERT. WIRE TO SUPPORT ABV. & CEIL. SUSPENSION MEEMBER W/MIN. OF 3 TIGHT TURNS IN 1 1/2" 4 ) SECURE DIAGONAL FRAMING WIRE TO MAIN RUNNERS WITH 4 TIGHT TURNS IN 1 1/2" 5) SEE IR 25-3 FOR ADDITIONAL CEILING INSTALLATION INFORMATION 12 GA. PERIMETER HANGER AT TERMINAL END OF EA. MAIN RUNNER & CROSS TEE, U.O.N. 4 WAY 45° DIAGONAL 12 GA. WIRE BRACING AND COMPRESSION POST. ONE EVERY 144 SF. MAX. BEGINNING @ 4'-0" MAX. FROM PERIMETER WALLS IN ROOMS EXCEEDING 1000SF 12 GA. MIN. WIRE AT OPPOSING CORNERS OF LIGHT FIXTURE 9 GA. VERTICAL HANGER WIRES @ 3'-0" O.C. @ EA. MAIN RUNNER CROSS RUNNER: 25 GA. 7/8" HAT CHANNELS @ GYP. BD. CLG. @ 24" O.C. OR 1" C CHANNES @ PLASTER CLGS. @ 2'-0" O.C. MAIN RUNNERS: 1 1/2" COLD-ROLLED CHANNELS @ 4'-0" O.C. LINE OF PERIMETER WALL 4'-0" * 4'-0" * 6" MAX. TYP. 4 I-M-01 5 I-M-01 4 I-M-01 1 I-M-01 15 I-M-01 7 I-M-01 19 I-M-01
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