Slight problem... rain in my attic.

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This would be a great question to place in that "Home/Apartments" forum that no one seems to want to give us... (hint, hint)

I was sitting in the house yesterday afternoon, and it was quiet. I heard what I thought was sprinkles of rain. But it wasn't raining outside.

Long story short, sometime in the past several months, I had ductwork come off of a bathroom exhaust fan. Now, I have an attic that is loaded with saturated, humid air. The excess humidity is condensing and freezing on the nails and roof sheeting when it is below freezing, and when it gets above freezing (or when the sum comes out)... it then melts and I get rain in my attic.

The attic is properly vented, with roof vents and soffit vents (with chutes). It is just getting rid of this surge of excess moisture that is the problem. The venting for the bathroom fans has been fixed, and is now venting outside again, as it should.

I now need to dry this air (and the roof sheeting) out in my attic. The only thing that I can think to do is to set up some fans (box fans, oscillating fans), and just stir the heck out of the air, to try and dry everything out (when the air temperature up there is above freezing). Plus, that would help on the insulation that has gotten wet on the top.

Will stirring the air help? Am I missing a better solution? Eventually, this will balance back out, with the venting that already exists... but I need to do something in the short term.
 
Stirring I doubt would help; can you get to the bents and stick fans there so they suck the air from inside the attic to the outside? Either that or rent a dehumidifier. That would be the best option.
 
Just put some extra fans up there for a day or two so the air gets good circulation. The dry winter air, assuming your attic is property vented, should help dry out the attic.

Originally Posted By: mrsilv04
This would be a great question to place in that "Home/Apartments" forum that no one seems to want to give us... (hint, hint)


It works just as well in the general and off topics forum.
 
Fans, dehumidifier and if you have a humidifier attached to the furnace I'd shut it off for about a week to dry the air out even more.
 
Insulate the vent piping itself. My vent pipe has 8' run from exhaust vent unit to outside wall. I have mine completely covered/wrapped in small attic space with no problems.
 
Op, you are lucky that it is cold now.

1. fix the bath duct to vent out properly
2. do you have gable ends?
you need to force air OUT of the attic, this will suck in dry fresh air and dry the attic, you will need to do it when the temps are near freezing for long time like a week.
3. Buy cheap moisture meter from amazon and test the moisture content of the wood in the attic
 
I just checked this morning, and things are back to normal up there. Between getting the exhaust fan vent repaired (and blowing outside again), running fans in the attic to stir the air (when the temperature was near/above freezing), and the existing ventilation in the attic doing its job... things appear to be back to normal up there. No more rain in the attic!
 
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