Static field route #19322

What do I do when trapeze hold-down clamps crush the duct?

Hanger Systems, Rods, Straps, Trapeze & Anchors✅ STANDARD CORRECTIONField answer expansion

📖 Verified core answer

Hold-downs should secure the duct, not deform it. Back off the clamps, add approved isolation/cushioning, and re-secure without crushing the metal.

Open in Field Rescue Open category

Field verification checklist

Look for crushed bottom skin, flange gaps, or corner leaks.
Check whether clamps are bearing on a joint or flange corner.
Add approved cushion/isolation where required.
Tighten evenly without oil-canning the duct.
Retest leak/noise if the joint was distorted.

Ask foreman

The hold-downs at [location] are crushing the duct/flange and opening a leak. Do you want me to back them off, add isolation pads, and reseal/retest the joint?

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 use hold-down clamps like a vise on thin duct skin.

Why this matters

Crushed duct changes shape, opens leaks, transfers vibration, and creates punch-list repairs.

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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