A duct that releases humid indoor air into the attic adds a separate moisture source. Have the ventilation contractor identify the termination and coordinate its weatherproof roof or wall outlet.
Trace the complete duct route
Ask the ventilation contractor to identify the fan, duct and exterior termination as a connected route. A hose lying near a roof opening is not the same record as a photographed connection. Label which bathroom each duct serves, particularly when several fans enter the attic. If the route disappears into an inaccessible area, ask the report to say so rather than assuming that it reaches the outdoors.
Coordinate the exterior outlet
When the correction involves the roof, have the mechanical and roofing scopes meet at a clearly described connection. Specify who supplies the outlet, connects the duct and completes the roof flashing. Ask who will verify fan operation after installation. These responsibilities matter because an otherwise detailed roofing proposal may exclude ductwork, while a ventilation proposal may assume someone else will weatherproof the penetration.
Record more than the finished roof cap
Request interior connection photographs as well as an exterior image of the completed outlet. Keep the fan and termination information together for future replacement work. If damp material is present, ask for a separate assessment of its condition instead of assuming the new duct route resolves existing damage immediately. Follow-up should address the original observation and any concealed areas that remain unexamined. The owner's practical role is to preserve a complete handoff between trades.
For a home with multiple bathrooms, a small outlet schedule is useful: room, fan model if known, duct route, exterior termination and contractor responsible. Mark uncertain routes honestly. When the roof is replaced later, share this schedule with the roofer before penetrations are removed. It gives the crew a starting point for preserving connections without requiring assumptions about identical-looking exterior caps.
For related project preparation, see roof ventilation changes during replacement and roof replacement sequencing with attic insulation work. Bring the relevant photographs and existing proposal to Perkins when discussing the roof-specific scope.
Technical references: PNNL: checking exhaust discharge outdoors; PNNL: bathroom exhaust fans. These references provide background; the selected assembly and applicable project requirements determine the installation detail.