TinnerFlow™2nd YearForeman Skills & Jobsite ProductivityStandard Correction
Do not keep blasting screws into stripped spiral metal. Reset the joint, move to clean fastening points, and reseal it by the approved pressure-class method.
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Spiral pipe is strong as a system, but the sheet at a sleeve joint can still strip if an impact driver is run too hard. Once the hole is stripped, that screw is no longer clamping the joint.
Back off the gun, pull the bad fasteners, shift to clean metal, refasten with the approved screws, and seal the screw heads and seam. For high-velocity or pressure-tested work, reinforce the seal with the project-approved mastic/tape system.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.