Apprentice question
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Moist exhaust in cold space needs condensation control. Seal the system and insulate/wrap it by the approved vapor-barrier detail.
['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.']