Missing BOD, TOD, AFF, or centerline elevation notes
Find the elevation note before layout. BOD, TOD, AFF, and centerline can describe different reference points.
Stop if
- What elevation controls here: BOD, TOD, centerline, or AFF?
Watch out
- Do not hang duct from a guessed height when the note is missing or unclear.
Check
- Locate the elevation callout on plan/section.
- Confirm whether it is BOD, TOD, centerline, or AFF.
- Compare with ceiling, steel, sprinkler, and lights.
- Check insulation/thickness if clearance is tight.
- Ask before hanging from an assumed elevation.
Steps
- Locate the elevation callout on plan/section.
- Confirm whether it is BOD, TOD, centerline, or AFF.
- Compare with ceiling, steel, sprinkler, and lights.
- Check insulation/thickness if clearance is tight.
- Ask before hanging from an assumed elevation.
Say this to your foreman
What elevation controls here: BOD, TOD, centerline, or AFF?
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