A duct run only has side-to-side seismic bracing

A long duct run usually needs restraint for more than one direction. Check the seismic layout and add the missing brace direction by approved detail.

Stop if

• This duct run has lateral braces but I do not see longitudinal restraint. I checked the run direction and seismic detail. Do you want longitudinal braces added before inspection?

Watch out

• Do not assume one brace direction controls every direction of earthquake movement.

Check

• Identify which braces are lateral vs longitudinal.
• Check run length and brace intervals against approved seismic detail.
• Look for straight runs with no end-to-end restraint.
• Coordinate conflicts before adding braces.
• Document corrected brace layout for inspection.

Steps

• Identify which braces are lateral vs longitudinal.
• Check run length and brace intervals against approved seismic detail.
• Look for straight runs with no end-to-end restraint.
• Coordinate conflicts before adding braces.
• Document corrected brace layout for inspection.

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