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Apprentice answer

Can duct be notched or squeezed around a storm drain pipe

3rd YearPrint Reading, RFIs & Trade CoordinationStop and get direction

Do not notch, flatten, or compress the duct around a plumbing line. Treat it as a coordination clash and bring measured offset options for approval.

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Plain-English answer

A cast-iron storm drain or roof drain line is a hard obstruction. Duct should not be smashed around it, and another trade’s pipe should not end up touching the duct.

Measure the obstruction, clearance, and available space. The likely recovery is an approved 45° offset, revised route, split/transition detail, or coordination correction. Keep clearance for vibration, insulation, condensation, and service access.

Ask Foreman

The storm drain crosses our duct path at [location]. I measured the pipe, slope, and duct elevation. The clean options look like a 45 offset or revised route. Which direction do you want?

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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