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Old 12-11-2009, 08:52 PM   #1
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Excessive moisture


i cant find the solution to all the moisture upstairs,i checked the usual/bathroom fan,attic insulation.we resided last year with foam insulation and house wrap.it is not downstairs because i have a gas fire place.all home improvement stores want me to do is buy a dehumidifier,is it that simple?

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Old 12-11-2009, 09:17 PM   #2
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Excessive moisture


How warm do you keep the upstairs? Where are you seeing this moisture?

Is this an older home that you put the foam and house wrap on?

I am guessing that you have significantly tightened up your house but am not sure what might be causing your moisture besides just everyday living. You said you had checked the exhaust fans and they are working and are being used.

What has been the outside temperature when you are seeing this problem?

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Old 12-12-2009, 06:59 AM   #3
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Excessive moisture


Where are you?
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Old 12-12-2009, 05:30 PM   #4
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Excessive moisture


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Originally Posted by meboatermike View Post
How warm do you keep the upstairs? Where are you seeing this moisture?around 67-68 degrees,all the windows even the bedrooms.

Is this an older home that you put the foam and house wrap on? built in 1979

I am guessing that you have significantly tightened up your house but am not sure what might be causing your moisture besides just everyday living. You said you had checked the exhaust fans and they are working and are being used.

What has been the outside temperature when you are seeing this problem?
15-25 degrees
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Old 12-12-2009, 05:32 PM   #5
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Originally Posted by ccarlisle View Post
Where are you?
north of mpls,mn.its 15-25 degrees outside,around 67 inside.
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Old 12-12-2009, 05:34 PM   #6
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Originally Posted by Handy_Business View Post
Knowing what area of the country you live in would be helpful.
i live north of mpls,mn.
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Old 12-12-2009, 05:54 PM   #7
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Excessive moisture


Hot air rises and will take the moisture with it. You may need to run your furnace fan for circulation. Why do you think it is high, windows sweating? Have you measured it with a hygrometer/humidity gauge and what was the reading.

Last edited by yuri; 12-12-2009 at 05:57 PM.
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Old 12-13-2009, 06:39 AM   #8
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Excessive moisture


You know, people put out a lot of moisture on a daily basis, as do plants and pets - and at this point we're not aware of all the facts about your living situation - but what we do know is that you re-sided a short time back. We also know now that you are in one of those intermediate climate zones - neither cold nor hot but a mixture of both - where half of the time, your house ventilation/heating/humidity/cooling systems is essentially working against you. Not your fault, just the way houses were constructed... oh, and throw in a few laws of physics that haven't changed since before we were even on this planet.

But we do know nowadays is that there two concepts that have to be considered together when you play around with the comfort in your home: insulation and ventilation. What you did is affect the 'ventilation' of your house by residing so that now instead of being 'leaky' your house is now air-tight. It used to be that houses were built leaky as that provided natural ventilation that would have solved your problem. But not so nowadays...

So the humidity produced every day (even though it is the same anmount as before the re-siding) has nowhere to go except condense on cold surfaces inside. No more drafts to whip it away...So the question becomes how to reduce the humidity level in your home during the time when opening a window isn't an option.

And the best we can do is control it: bathroom fans left on 20 minutes after showers, dryer vents vented to the outside, kitchen fans vented outside, or run a dehumidifer etc because you can't make your house leaky again in the winter. But you can also dilute the humidity, like yuri says, by keeping the air moving if you have a furnace with a fan, or just place tabletop fans here and there to keep the moist air moving around and not settling down on some cold spot creating a mould situation.

And to do all this effectively, you'll need a cheap humidity guage, like $10 or so, to monitor the relative humidity level in various rooms. You should be aiming for about 50% RH at 68 degF.

Oh and if you have condensation on the windows, they may be just cold or leaky.
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Old 12-13-2009, 07:32 AM   #9
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Excessive moisture


One possibility is that you are over-humidifying, according to the Building Science Corp. a 25 percent interior relative humidity at 70 degrees
would be appropriate for Minneapolis
during the heating season.
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Old 12-26-2009, 08:10 PM   #10
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Excessive moisture


Just an update,I broke down and bought a dehumidifer.You would not believe the difference,hardly any moisture on my windows.thank you for all the help...
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Old 12-27-2009, 07:45 AM   #11
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Cool...!

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