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Old 12-20-2010, 08:26 PM   #16
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frost in attic


put the monitor outside, temp dropped and humidity dropped. also had a thermostat and humidistat hooked up to the attic fan, humidistat was set at 80 fan kept running so i killed the main power source. dont have a barometer?

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Old 12-20-2010, 08:39 PM   #17
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frost in attic


I have a fan for the bath down stairs it vents out to the garage, bath up stairs ooesnt get used much, no fan but have a window, getting fan this week. not sure if the roof is still dripping frost up there this morning got discouraged and went to work. kitchen has a microwave with filters and an exaust fan that comes back out the front on the top (not sure i like it). i was running the attic fan 24/7 for three days and the humidity never dropped below 75%. not sure on the shingles (shingles not tin) let me ask this, I keep looking at the weather channel and they are showing anywhere from 70% humidity to 84% humidity where i live (toledo Ohio). maybe im stupid, but isnt this the air that I am pulling in to the attic to drive out the moisture? seems like i'm replacing moist air with more moist air?

Last edited by bakmorse; 12-21-2010 at 07:56 AM.
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Old 12-20-2010, 08:46 PM   #18
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frost in attic


it seems like most of the frost that i am seeing is in the first 8-10 up from the soffits? sorry for all the posts just remembering stuff and want to throw it all out there. did i mention humidity level in living quarter is at 33%
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Old 12-20-2010, 09:57 PM   #19
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frost in attic


That's why I am wondering if there is actually anything wrong and if you were actually still having problems with condensation and water problems. Your attic is going to be basically the same RH as the outside temps. This cold out humidity is usually going to be 70% plus. Your ventilation is simply air being drawn in at the soffits and vented at the ridge. Unless you are still experiencing moisture damage then there is no problem.
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Old 12-20-2010, 10:50 PM   #20
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frost in attic


Turn the attic fan off for a few days. Your ventilation isn’t balanced with the power vents: http://www.advancedenergy.org/buildi...%20Studies.pdf

http://www.ronhungarter.com/ventilation_repairs.html

Back up a page: http://books.google.com/books?id=Eq1...page&q&f=false

Gary
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Old 12-21-2010, 06:52 AM   #21
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frost in attic


yes attic fan has been off since saturday. just checked the rh level it is 98% sill no frost in the top half of roof. bottom half has some had to go up to feel it to make sure, (eyes werent working right, laid awake trying to figure out this mess) felt some moisture from drippage on the insulation. Hey oldnbroken you said something about a barometer, should i have one? thanks again all

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Old 12-21-2010, 09:21 AM   #22
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frost in attic


No, you don't need one. I was just occasionally checking mine for the last week and every time pressure went up, RH went up and vise versa. Mine has maintained consistency with the outdoor readings and has not dropped below 70.

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