Condensation On Attic A/C Ducts - HVAC - DIY Chatroom Home Improvement Forum

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Old 08-29-2010, 04:38 PM   #1
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Condensation on attic A/C ducts

Got a problem that recently cropped up. Just noticed some ceiling water damage. Went into the attic to check it out and found that the water source is from ym A/C duct.

The offending duct shows water damage from the air handler down one main line to the kitchen - about 30 feet. The duct lines are metal. I cut the insulation open to check for direct leaks. None found. Also, since the issue runs the length of 30 feet, it would seem odd for there to be a leak unless there was a seam in the ducting where the leak is. Not such seam.

I'm really at a loss here. Before I call the A/C guys, I'm looking for a little input. Also, why just this part of the A/C duct and not in other parts of the house. Why all of a sudden and not for the prior five years? I know, I know; tough to say without actually running some tests and performing some examinations.

So, is a leak likely even if there is condensation running a 30 foot length of ducting? How about the venting of hot air from the attic? Could that be an issue? Should I just replace the offending length with flexible ducting instead of trying to troubleshoot? Seems it might be a quicker alternative.

One last thing. We even in areas where there is batt insulation adding additional insulation to the duct, there is condensation.


unlvrebel is offline   Reply With Quote
Old 08-29-2010, 05:31 PM   #2
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Could be an air leak on the supply run. Turn the fan on and see if you feel air blowing out at the beginning of that run.


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