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Old 09-29-2015, 12:34 AM   #1
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Bathroom fan duct not connected to roof cap


I'm in the process of renovating a bathroom and noticed when removing the old fan that the exhaust duct ran vertically into the roof cap but wasn't connected to it in any way, rather it was just sitting up in there, being held up by its connection to the fan. Is this a typical installation that I can repeat with the new ducting or does it need to be secured and sealed within the roof cap? I'm concerned about moist air dumping into the attic space rather than completely out the roof cap. Hopefully this pic illustrates the question, you can see all the space around the duct where it pokes up into the cap. Thanks!
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Old 09-29-2015, 09:56 PM   #2
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I'd hit that area with a can of spray foam to seal it. All those cobwebs mean there is air leakage coming in there.

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Old 09-29-2015, 09:58 PM   #3
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Very common install for California in homes in your time period.
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