Static field route #19329

What do I do when hanger strap edges are cutting into round duct?

Hanger Systems, Rods, Straps, Trapeze & Anchors⚠️ CHECK BEFORE YOU FIXField answer expansion

📖 Verified core answer

Narrow sharp straps can damage round duct skin. Replace them with approved heavier/wider support or saddles that spread the load.

Open in Field Rescue Open category

Field verification checklist

Look for dents, cuts, or shiny rub lines where strap touches duct.
Check whether strap edges are raw/sharp.
Verify duct size and approved round support method.
Support the run before removing damaged straps.
Patch/replace any duct skin that has been compromised.

Ask foreman

The hanger straps at [location] are cutting into the round duct skin. I checked the contact points. Do you want approved saddles/heavier bands installed and the damaged skin repaired?

Text to foreman

Route options

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

BHold and document the condition if the fix affects support load path, structural steel, seismic restraint, life safety, another trade, or inspection.

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

Do not do this

Do not leave thin sharp straps digging into round duct.

Why this matters

Cutting straps can weaken the duct wall, create leaks, and let the support fail over time.

Final verification

Use this as field training guidance. Final direction still comes from the foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, structural/seismic detail, and AHJ/code requirements.

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