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Old 08-29-2010, 05:38 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.

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Old 08-29-2010, 06:31 PM   #2
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Condensation on attic A/C ducts


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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