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Old 09-11-2012, 12:39 PM   #1
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One A/C vent leaking in house.


One A/C vent leaks in a bedroom. After a leak in the ceiling of the same bedroom and the A/C not producing cool air in the house, I had the runoff pipes cleaned, freon checked and coil cleaned. A/C worked well for about 5 days and then vent leaked. Any ideas why my vent is now leaking?
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Old 09-11-2012, 03:38 PM   #2
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One A/C vent leaking in house.


What do you mean by vent? The supply grill/register where the air comes from? That has condensation (water) leaking from it? Is that what you mean?

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Old 09-11-2012, 06:36 PM   #3
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One A/C vent leaking in house.


Yes. The air supply vent with grill and lever to open and close.
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Old 09-11-2012, 07:17 PM   #4
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One A/C vent leaking in house.


Easy peasy fix, my friend! The dry cool air coming from the air conditioning vent is mixing with the warm humid air surrounding the vent. What this does is ring the moisture out of the warmer humid air, like wringing out a wet dish cloth or towel. I've come across this a few dozen times, can be one of two things: the grill itself from up top in the attic needs to be sealed where it penetrates the sheetrock and then you need to toss and pack down some attic insulation around it.

You can use mastik for this job, apply with a cheap paint brush.




or the duct itself has come loose from the register or has a hole in it at the grill. You may be able to tell by removing the grill from the ceiling but this is what it should resemble up top:

Liner taped to metal register. Note the sheetrock around the grill, not insulated.


And then the insulation from the duct pulled over it all and sealed. Now note the attic insulation all around the grill.


You can use the aforementioned mastick instead of tape to seal all around the grill. Gray or white, doesn't matter.



Your a/c system is working just fine, this is more of a construction/install issue.
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Old 09-12-2012, 01:34 PM   #5
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One A/C vent leaking in house.


Great! I'll give those a try Thank you.
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