Static field route #18802

What do I do when a branch tap is laid out off and the duct runs crooked?

Measuring, Field Verification & Layout Marks📐 PERFORMANCE / COORDINATION CHECKV188 answer-gap expansion

📖 Verified core answer

Do not rack the joints or dog-leg the duct to hide the layout miss. Measure the offset, confirm the target point, and decide whether the correction is a new tap, patch/remake, or approved offset fitting.

Open in Field Rescue Open category

Field verification checklist

Mark the current tap centerline and the correct target centerline.
Measure offset left/right, up/down, and the available straight length for a correction.
Check if the tap hole is already cut, sealed, insulated, or easy to correct now.
Confirm whether the branch serves a diffuser, wall sleeve, VAV, or equipment connection.
Check whether an offset fitting would create access, ceiling, or airflow trouble downstream.

Ask foreman

The branch tap on [main/location] is off by about [amount] from the target. I measured the offset and the run length. Do you want me to correct the tap, patch/remake the section, or build an approved offset fitting?

Text to foreman

Route options

AMake the small field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

Do not twist the branch, rack S-and-drive/TDC joints, or leave a crooked run because the first layout mark was wrong.

Why this matters

A crooked branch can leak, bind connections, miss the opening, create ugly finish work, and make the mistake harder to fix after insulation or ceiling close.

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.