Why is shower or locker exhaust leaking water through spiral duct seams

Plain-English answer

Warm humid exhaust can condense when the pipe skin is cold. Water then follows seams and pinholes until it finds drywall.

Check whether the run is pitched, insulated, sealed, and routed correctly. Dry the area, repair leaks, add approved vapor-barrier insulation or condensation control, and confirm the moisture source is handled.

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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.

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