Do not move seismic/sway bracing casually: missing sway control on long run.
High-risk starter answer - stop before you change, move, drill, or attach anything tied to seismic bracing, sway control, structural support, crane work, or rigging. Verify the approved detail and the qualified person's direction before acting. If a run or equipment connection appears to be missing restraint, flag it instead of adding a random brace.
Do not modify or copy bracing/rigging from another area just because it looks similar.
Check
Walk the run and measure the distances between any existing lateral or longitudinal braces.
Compare what you see to the approved seismic/detail drawing for this project. Brace spacing, hardware, and direction vary by project and seismic zone.
Look for brace symbols or callouts on the drawing at regular intervals along the run. If the run is long and the drawing shows no brace symbols, flag it instead of guessing.
Do not assume a run that looks like it sways freely is fine. Document the span, photograph the run, and bring the measurement to the foreman before covering or closing the ceiling.
Do not add sway bracing on your own using parts from another area - the hardware, angle, and anchor must match the approved detail for this run.
Steps
Walk the run and measure the distances between any existing lateral or longitudinal braces.
Compare what you see to the approved seismic/detail drawing for this project. Brace spacing, hardware, and direction vary by project and seismic zone.
Look for brace symbols or callouts on the drawing at regular intervals along the run. If the run is long and the drawing shows no brace symbols, flag it instead of guessing.
Do not assume a run that looks like it sways freely is fine. Document the span, photograph the run, and bring the measurement to the foreman before covering or closing the ceiling.
Do not add sway bracing on your own using parts from another area - the hardware, angle, and anchor must match the approved detail for this run.
Say this to your foreman
This duct run is approximately [length] with no visible sway bracing. The detail shows bracing at [interval/location] but I do not see it installed. Do you want me to flag this span for brace installation before we continue?