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 01-09-2010, 18:23 Post: 167971
kthompson



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  Attic condensation Leak exhaust duct

Depending on air movement it will do this without the light on. Just the difference in the in house temp and the attice temp. Air leaks around recesssed lighting happens. Here it was (not sure if still is) code did not allow insulation over recessed lighting due to heat built up.

Made a mistake when installing exhaust duct in one bath room with non insulated metal running straight up. No problem except when attic is cold (about freezing or colder) then the can be a good amount of dripping on top of toilet seat. Made us wonder about the puddles on top of the seat until one day the water dropped on one of us.






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 01-11-2010, 09:32 Post: 167987
kthompson



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  Attic condensation Leak exhaust duct

Quote:
Originally Posted by earthwrks | view 167972
Kenny that vent pipe should exhaust into a roof vent or the air will still condense in the attic like I mentioned earlier. Insulating the pipe does as you say help.And that puddling on thr seat thing---yer supposta lift the seat.Speaking of toilets, didn't you tell me that one time your bathroom caught fire? But...luckily you put it out before it got the to house. Lol



In our normal warm weather venting to the attic works well. Two of ours vent to the eaves which allows any condesition to drip or ice up as temp may be on where either will cause no damage. Our bathroon has a very high roof line above it and it vents to outside vent but the bare metal the temp had already dropped before it gets outside.

As to the fire you are correct, but you never did tell me was what was the cause of the fire...what you were smoking or what you were releasing. Has all the hair grown back?

Well I could have said yes, we place all outhouses in Washington. You pick the one you like best.






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 01-14-2010, 16:24 Post: 168048
kthompson



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  Attic condensation Leak exhaust duct

I may not fully be in understanding of Cutter but I do agree it does not seem like there would be enough moisture in a vent pipe that has mostly gases in it to freeze shut. But I learned long ago just cause I have not seen it happen does not mean it can not.

Ken as to Codes not liking venting into attic...all I can say is some points do vary a good bit. One that surprises me at least 10 years back when our house was built was low voltage lines had nothing related to them. Don't think they would have cared if on top of studs for sheet rock to have laid on them. Matter of fact electrician ran one door bell wire that way and it was me who required it to be moved not code.






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 01-15-2010, 16:28 Post: 168059
kthompson



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  Attic condensation Leak exhaust duct

Colder air has lower moisture levels. You need just the right temp and moisture level for it to happen enough to show up. My guess is if you were to place say a tissue on the floor you would notice the sign of a few drops on it but not enough to show on the carpet.

Or it is due to global warming and since this winter is global cooling it happened but I like my first thought better.






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 01-16-2010, 13:19 Post: 168087
kthompson



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  Attic condensation Leak exhaust duct


"Relatively Speaking …
Relative humidity (RH) is the percent of moisture actually in the air compared to the maximum amount of moisture the air can hold at that temperature. Cold air can hold less moisture than warm air. At 70ºF, air can hold as much as 12 times the amount of moisture as 10ºF air. That’s why it’s usually more humid in the hot summer months."


Ole Jeff the above quote is found at the link. The same is found in many post on the internet, NASA's was little too long to post.

But seriously you know winter air is dryer, that is why your skin has such a problem being dry and the large jump in sales of all kinds of creams. The fact cold air has 89% relative humidity could be 100% true but if the air was warmed that 89% would begin to drop as warmed. That is why as warm air goes out my exhaust pipe that is not insulated it sweats or condenses and drips into my house. Just think about where most rain (maybe all I don't know that) comes from. You have a warm air mass that meets a cold air mass. If the warm air mass has a high relative humidity you will have rain or snow. Of course warm air and cold air can be dry or full of moisture as it relates to their tempature.

Now HOT Air from Washington may be a different issue.






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 02-13-2010, 19:17 Post: 168594
kthompson



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  Attic condensation Leak exhaust duct

Dennis, did you find the source of the "leak"?






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 07-09-2012, 13:31 Post: 184190
kthompson



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  Attic condensation Leak exhaust duct

When we built we install large capacity exhaust fans in our bathrooms. We also used galvanize pipe and with two no issues. But the main bathroom the pipe was run straight up for a few feet. All was fine till we started getting water drops out of our fan. Took a little bit of thinking to realize it was the hot moisture laden air hitting the cold attic air and it really turn the moisture into rain. So we learned in the winter time it make good energy sense to not run the exhaust fan for steam removal. It was not just moisture on the inside of the pipe but it also was on the outside of the uninsulated pipe and that was staining out ceiling.






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