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Apprentice answer

Can you hang duct from a diagonal web rod in an open-web steel joist

3rd YearHangers, Supports & AnchorsStop and get direction

Do not hang a duct trapeze from a diagonal joist web member unless the structural detail specifically allows it. Move the load to an approved support point.

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Plain-English answer

Diagonal web members are part of the joist structure, not general hanger points. Side-loading one can bend the member and damage the joist.

Support the duct, remove the wrong attachment, and move to approved chord/panel-point support or an engineered bridging member.

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The trapeze at [location] is clamped to a diagonal open-web joist member and it is bowing. Do you want us to shift to an approved chord/panel point or engineered bridge?

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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