USG Seismic Grid Systems

Ceilings are important non-structural components vulnerable to earthquake damage. During a seismic event, damage can occur at the perimeter when the vibration period of acoustical ceilings is significantly different than the building structure and other non-structural components -such as non-load-bearing partition walls. Ceilings with heavy lighting fixtures may be susceptible to damage around thefixture, causing light fixtures tofall into the occupied space. The consequences include loss of operation and life-safety hazards.

American institutions, ASTM (American Society for Testing Materials), IBC (International Building Code), ASCE (American Society of Civil Engineers) ve CISCA (Ceiling&lnterior Systems Construction Association) correspondingly standardise the seismic requirements for the suspension systems of acoustical tiles and lay­ in panels depending on the seismic risk level of the regions.

ASTM E580 IASTM ESBOM - (Standard Practice for Installation of Ceiling Suspension Systems for Acoustical Tile and Lay-in Panels in Areas Subject to Earthquake Ground Motions),

ASTM C635 - (Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay in Panel Ceilings)

ASTM C636 - (Standard Specification for the Installation of Metal Suspension Systems for Acoustical Tile and Lay in Panel Ceilings)