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The following are all the IBC Category D,E,F2 Code Requirements for lay-in acoustical panels and direct-hung acoustical tiles.
|Basic Connections, Perimeter, and Lateral Splay Bracing||Requirements|
|Minimum intersection strength limits @ MT / CT||180 lbs|
|Vertical hanger wire 12-gauge @ 4' o.c.||Required|
|Connection device from vertical wire to the structure above must sustain min 100 lbs||Required|
|Main tee classifications||Heavy-duty|
|1 in 6 max plumb of vertical hanger wires||Required if perimeter hanger wires are used|
|Perimeter vertical hanger wires not more than 8" from wall||Required|
|Grid end/wall clearance||Min 3/4"|
|Perimeter closure (molding) width||Min. 7/8" with ACM7 Seismic Clip|
|Grid connection to perimeter attached on two adjacent walls||Required|
|Perimeter tee ends tied together||Required (ACM7 Seismic Clip satisfies this requirement)|
|Horizontal restraint (splay wires or rigid bracing) within 2" of intersection and splayed 90° apart at 45° angles||Required|
|Compression posts (struts) 12' o.c. in both directions, starting 6' from walls||Required|
|Splay bracing connection strength 200 lbs or the design load, whichever is greater||Required|
|Partition attachment||Bracing independent of ceiling splay bracing|
|Seismic separation joint4||Required for areas > 2,500 sq. ft. (or full height partition)|
|Rigid bracing for ceiling plane elevation changes||Required|
Light Fixture Attachment
|Light fixture (all types) mechanically attached to grid NEC 410-16 (two per fixture unless independently supported)||Required|
|- Surface-mounted fixtures attached to grid||Not Required|
|- Pendant-hung fixtures directly supported from structure with 9-gauge wire (or approved alternative)||Required|
|- Rigid lay-in or can light fixtures|
≤ 10 lbs – one wire to structure (may be slack)
11 to 56 lbs – two wires from housing to structure (may be slack)
≥ 57 lbs – supported directly to structure by approved
Light Fixture Supplementary Hanger Wires
|Intermediate Duty Main Tees with cross tee rating below 16 lbs./LF||Required|
Min. 12-gauge hanger wires must be attached to the grid members within 3 inches of each corner of each light fixture.
|Heavy Duty Main Tees with cross tee rating below 16 lbs./LF||Required|
Min. 12-gauge hanger wires must be attached to the supporting cross tee within 3 inches of the corner of each light fixture.
Supplementary hanger wires for Heavy Duty Main Tees with cross tee rating equal to 16 lbs./LF
≤ 20 lbs – positively attached to grid
21 to 56 lbs – positively attached to grid and two wires to structure (may be slack)
≥ 57 lbs – directly supported to structure
|Sprinkler heads and other penetration clearance||Min 2" dia. opening or a swing joint|
|Cable trays and electrical conduit independently supported and braced||Required|