Static field route #73

What do I do when measuring from an unverified existing duct?

Measuring, Field Verification & Layout MarksFoundation layout starter — field verify before cutting/loading

Do not trust existing duct as a control point until it is verified. Existing work can be wrong, moved, or scheduled for demo.

Open in Field Rescue Open category

Field checklist

Check whether existing duct remains or is demo.
Measure from grid/control if possible.
Compare existing location with current drawings.
Verify tie-in point.
Ask before matching existing work.

Ask foreman

Is this existing duct a verified control/tie-in, or should I measure from grid?

Do not

Do not copy existing duct location just because it is already there.

Why it matters

Existing work may be the problem the new work is supposed to fix.

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