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Seismic Installation for Contractors


Product Type
Ceilings Walls Suspension Systems Trims & Transitions Building Perimeter Systems Drywall Grid Systems

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IBC SEISMIC INSTALLATION REQUIREMENTS
IBC
CATEGORY

IBC INSTALLATION REQUIREMENTS

A,B

Ceiling installation should conform to basic minimums established in ASTM C 636.


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
  • Safety wires required on light fixtures

NOTE: Requirements for essential use facilities may be different.
Contact TechLine for details.


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 within 8"

NOTE: Consult your local code professional for information specific to your region. California projects may be governed by DSA and OSHPD.

 

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