Current Seismic Code

Tested and Trusted Seismic Solutions

Code Official's Role

The building code presents minimum design/performance requirements and in some instances prescriptive guidance. The code also sets forth limitations and conditions of use. It is important to know that while the building code establishes the requirements, the code official has the power to enforce its provisions. The code official also has the latitude to allow materials and methods of construction that are not addressed in the code. A code official can perform their own analysis of evidence presented or can rely on independent, qualified sources such as ICC-ES to do the analysis and provide their findings.


Federal Emergency Management Agency (FEMA)

Seismic performance during large California earthquakes prompted the Federal Emergency Management Agency (FEMA) to address suspended ceiling performance during a seismic event. Research and tests demonstrated that industry seismic standards (UBC Standard 25-2) were not adequate. To support individual panels around the perimeter, FEMA determined that the key to good seismic performance is a wider wall molding on all sides. This led to the International Building Code requirement for 2" wall molding on all sides.

Source: FEMA 302 NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures

Adoption of the International Building Code (IBC)

Currently all 50 states as well as Washington, D.C. and the Virgin Islands use the International Building Code.

Seismic Design Categories

The seismic design category must be specified by a professional engineer or registered architect on the project drawings per ASCE 7. The project requirements which include the seismic design category can be found in Section 1 of the specification and on the first page of the structural drawings.


Other Performance Criteria to Consider