Condensation forming (pic)...

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Old 06-22-20, 10:27 PM
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Condensation forming (pic)...

1) What is likely the cause of this condensation?

2) Can it just be wrapped in foil tape?

 
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Old 06-23-20, 03:30 AM
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If it's an air duct then it's caused by the cold pipe/duct inside a humid room. Foil tape won't stop it but insulating the duct could.
 
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Old 06-23-20, 06:55 AM
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Can you elaborate on insulating the air duct? Any specific recommendations after looking at it?
 
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Old 06-23-20, 04:41 PM
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It's just like a cold glass or soda can on a humid day. Water will condense on the cold surface. There are two options; insulate the duct or keep the humidity in the space low.

The problem can be avoided by running the AC more liberally and holding the temperature and humidity low inside the building. If the humidity is low enough and the temperature difference small enough between the room and duct then condensation will not form.

Another option is to wrap the duct in insulation and vapor barrier. When wrapped the outside of the insulation will be close to the room temperature and moisture will not condense. There needs to be enough insulation so the outside does not go below the dew point and it needs a good moisture barrier on the outside to prevent the insulation from becoming water logged.
 
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Old 06-24-20, 06:32 PM
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After reading up on this, I'm convinced your solution is best.

Do you believe these items are available at Lowe's in a small quantity? The duct is only six ft long in the closet.
 
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Old 06-29-20, 03:38 PM
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Is something like this recommended?

https://www.lowes.com/pd/Reflectix-R...5-ft-L/1014123

 
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Old 06-29-20, 04:23 PM
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That is for a different situation, a roll of R13 insulation wrapped around the pipe and duct taped is probably the simplest solution.
 
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