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Old 07-12-2014, 01:50 PM   #1
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Insulating short stretch of circular duct that has damper

I have a condensation and drip page problem where my 8" exposed circular AC duct comes out of the ceiling. Above the ceiling is the attic, meaning it gets pretty hot. As you can see in the pictures, the small (maybe 6-9") stretch of the pipe between the plenum box above and where it comes out of drywall (will come out of drywall) is uninsulated, the guy left it like that because a damper is there that I want to have access to through a future small panel door. So he couldn't just wrap around because the damper was in the way. I didn't think leaving it like that could cause condensation but it does.

My question is, is there some kind of (preferably self-adhesive) insulation tape that I can apply around all but the leeway of the damper to prevent or reduce condensation? Or would you recommend something else?
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Last edited by amakarevic; 07-12-2014 at 01:54 PM.
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Old 07-12-2014, 09:21 PM   #2
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I would build a box out of foam that is above the damper on the attic side and seal it to the attic floor.

Seal all the connections in the line with mastic as well.
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