At what duct size or weight does the code require lateral and longitudinal seismic bracing?
There is no single duct size or weight that triggers seismic bracing on every job. The requirement depends on the project seismic design, component importance, location, exemptions, duct size/weight, and the approved engineered restraint package.
['There is no single duct size or weight that triggers lateral and longitudinal seismic bracing on every project. Requirements and exemptions depend on the project seismic design, component importance, location, system weight and size, and the approved engineered restraint package.', 'Use the project seismic drawings, calculations, specifications, and approved restraint submittal. If the run is not clearly covered, stop and have the foreman or project engineer identify the applicable detail before installing braces or attachments.']
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.
Steps
Stop and verify the approved project detail, foreman direction, and manufacturer or engineered requirements before acting.
There is no single duct size or weight that triggers lateral and longitudinal seismic bracing on every project. Requirements and exemptions depend on the project seismic design, component importance, location, system weight and size, and the approved engineered restraint package.
Use the project seismic drawings, calculations, specifications, and approved restraint submittal. If the run is not clearly covered, stop and have the foreman or project engineer identify the applicable detail before installing braces or attachments.
Say this to your foreman
at what duct size or weight does the code require lateral and longitudinal seismic bracing?