Static field route #19649

What do I do when screws were driven into the spiral lockseam?

Spiral, Round & Oval Duct Install⚠️ CHECK FIRSTField answer expansion

📖 Verified core answer

The spiral lockseam is the pipe’s structural seam. Fasten through smooth barrel metal at the overlap, not through the multi-layer lockseam.

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Field verification checklist

Find the factory spiral lock seam before drilling.
Place screws evenly around smooth barrel skin.
Inspect any seam that was hit for splitting or unzipping.
Replace badly damaged pipe sections.
Seal screw heads and the joint after mechanical fastening.

Ask foreman

Stay away from the spiral lockseam track with your drill! Drive your screws into the smooth, flat metal skin of the pipe barrel so you don't unzip the structural seam.

Text to foreman

Route options

A Correct prep/setup only if the fix is within your assignment and the approved method is clear.

B Hold and document if it affects safety, structural support, rated assemblies, airflow, access, tools, material condition, or another trade.

C Bring the journeyman/foreman the location, what you checked, and what decision you need before the crew loses time.

Do not do this

Do not drill directly through the four-ply spiral lockseam track.

Why this matters

Damaging the lockseam can ruin the pipe and create a leak path.

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, pressure/material schedule, and AHJ/code requirements.

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