Condensations around ventilation duct in cold attic

[hsahhzad]

I have noticed this type of floor around ventilation duct in the cold attic; it seems the issue has been there for some time; I am confused if it is leakage of condensation; however I do not see any issue after traces coming from flashing area

 

[Oldboy]

Svårt att avgöra vad jag ser på bilderna...
Det kan dock vara fukt från antingen kondensation eller från läckage. Det verkar vara en fog mellan stålplåtarna där det är mest vatten, så läckage därifrån kanske, eller bara en tillfällighet...

Om kanalen innehåller varm luft och det omgivande området är en kall vind skulle kondensationen vara på insidan av kanalen, inte på utsidan.

 

[hsahhzad]

Hard to tell what I see in the pictures...
However, it can be moist from either condensation or from leakage. It seems to be a joint between the steel plates where most water is so leakage from there perhaps, or just a coincidence...

If the duct contains warm air and the surrounding area is a cold attic the condensation would be on the inside of the duct, not on the outside.

My plan is to remove the floor and see around the source of moisture! I will share the pictures