Seismic > Seismic Installation Requirements for Code Officials
IBC SEISMIC INSTALLATION REQUIREMENTS
IBC
CATEGORY
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IBC INSTALLATION REQUIREMENTS
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| A,B |
Ceiling installation should conform to basic minimums established in ASTM C 636.
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| C |
To be installed to CISCA recommendations for areas subject to light to moderate seismic activity.
- Minimum 7/8″ wall molding
- Grid must not be attached to the wall molding
- Minimum 3/8″ clearance on all sides
- Minimum 3/8″ overlap of grid on the wall molding
- Ends of main beams and cross tees must be tied together to prevent their spreading
NOTE: Requirements for essential use facilities may be different.
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| D,E,F |
Installation must conform to CISCA recommendations for areas subject to severe seismic activity.
IBC categories D, E and F must also meet these additional requirements:
- Minimum 2″ wall molding
- Grid must be attached to two adjacent walls –opposite walls must have a 3/4″ clearance
- Ends of main beams and cross tees must be tied together to prevent their spreading
- Heavy-duty grid system
- Ceiling areas over 1,000 SF must have horizontal restraint wire or rigid bracing
- Ceiling areas over 2,500 SF must have seismic separation joints or full height partitions
- Ceilings without rigid bracing must have 2″ oversized trim rings for sprinklers and other penetrations
- Changes in ceiling plane must have positive bracing
- Cable trays and electrical conduits must be independently supported and braced
- Suspended ceilings will be subject to special inspection
- Perimeter support wires
NOTE: Consult your local code professional for information specific to your region.
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