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Clothes Dryer Venting

By Tim Carter
©1993-2008 Tim Carter
Summary: Venting your clothes dryer directly into the garage could be a building-code violation and a bad idea. Dryer vents exhaust a large amount of water vapor. Putting this condensation into your garage could create rust on unpainted surfaces, and worse, mold inside the walls and ceiling. Clothes-dryer venting should be to the outside.

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Comments

Leonard
18 Feb 2008, 15:41
Thanks, Tim! I often wonder if the people who use lady's hose in their garage realize the problems they may be encouraging. The cost of proper ventilation can be much less than the potential damage you correctly mentioned. BTW, people have slipped on moistened garage floors (already smooth) near vented dryers... Best wishes!
Kevin
24 Feb 2008, 17:29
I have a slightly different twist. I was hoping to have both the drier and furnace exhaust discharge into a compost pile. Any thought on how, if at all, this could work?

Kevin
AsktheBuilder
01 Mar 2008, 15:28
Kevin,
Your idea is crazy. Do it at the peril of you and your family.
Chris
24 Mar 2008, 10:55
If you exhaust the dryer to your roof, won't you get lint build-up on the asphalt shingles? I would imaging there are quite a few people that would not checking the vent openings and cleaning the lint buildup on the roof.
AsktheBuilder
24 Mar 2008, 11:23
Chris,
Great question! Does it rain where you live? Let Mother Nature take care of any cleanup. Also, tell me what is worse: lint on shingles or wood rot??????
Vlad
27 Mar 2008, 18:18
Can most dryer-vent roof caps be readily be de-linted from the outside? I am considering having Icynene insulation sprayed in the attic, and I assume this will make it impossible to access and clean the vent mesh from inside the attic. Is a lint-trap installed between the vent and the dryer a good way to minimize or even eliminate the need for such maintenance? Thanks!
El
27 Mar 2008, 19:17
My home is almost 6 years old. I live in OH.

The builder of this home has a good reputation but........... apparently (I've been told) he didn't know to put insulation around the vent from the dryer going up in the attic.

At least 3 people that have homes built by this builder had problems with water leaking into different vents (bathroom exhaust fans, exhaust for dryer, and the like) during the winter problems early in 2008.

I can't simply vent my dryer into the garage now that I see the problems that can come from that. It costs too much to move the washer/dryer. I may look into getting one of those washer/dryer combos that do not need ventilation for the dryer.

What responses can I read about this?
AsktheBuilder
29 Mar 2008, 05:43
Vlad,
You will almost always need access from the roof side of the vent to clean the damper. You can't count on a clean lint filter to eliminate this maintenance.
AsktheBuilder
29 Mar 2008, 12:33
El,
I have a feeling the leak issue is not hard to fix. Why not get an expert roofer out to see if it is a flashing issue?
Danny
30 Mar 2008, 14:37
My dryer is vented up through the attic and out the roof. I have been having problems with my dryer forming some sort of black build up that leaves my white clothes looking dirty. My wife has cleaned out the dryer multiple times and I went as far as changing the complete ductwork to try and solve this. I have a solid vent pipe from the laundry room and into the attic then in the attic I am using a silver flexible duct to the actual vent leading to the exterior. What can I do to stop this? Would it be better to run the vent down through the crawl and out the side of the house to prevent condensation from traveling back thru the duct and back into the dryer? (This, I suspect, is causing the problem but I'm not sure) Please help!
AsktheBuilder
31 Mar 2008, 16:27
Danny,
Take apart the vent pipe to inspect it. I have no idea how things in that pipe could go backwards against the air flow. Are you sure there is not something that fouled the dryer like a black ballpoint pen?????
Jack
01 Apr 2008, 09:17
My rental property has the dryer vent to the cavity between 2 studs in a wall. The laudry room is located in the center of the house. How can I vent the dryer. Going to the interior wall can't be correct. Do I have to run a 4" metal duct from the dryer up to the attic and out the roof? This could be about 15 feet long. Is this alright?
AsktheBuilder
04 Apr 2008, 05:02
Jack,
Yes. Please read all of my Dryer-Venting columns. There are several, and contain the answers you need. Then watch my video on the Exhaust Fan Flashing.
Ravi
06 Apr 2008, 13:04
Hello,
I have a Maytag Natural Gas dryer, for some reason all of a sudden it started turning my white clothes gray/black. The vent leads outside and has been cleaned. But the white clothes still turn black. What could be the possible problem solution? please help... thanks
Wendy
06 Apr 2008, 18:54
We've been having a ton of trouble with our dryer since we moved in 2 years ago because the vent was run underground and out through a pvc pipe. Every week my husband has to suck out gallons of standing water with a shop vac as it would take several hours to dry 1 load of clothes. So today a friend of ours suggested venting right into the garage, which they then did... However, I was skeptical and decided to do some research. Boy am I glad that I found this information! I will be making my husband fix this right away before we have more problems. Thanks for the advice!
AsktheBuilder
09 Apr 2008, 19:54
Ravi,
My first guess would be ink from a pen or marker. Something made it into the dryer that should have never been in the washer.
Scott Strang
10 Apr 2008, 07:06
We bought a new house roughly 2 years ago and, unlike many other houses in the neighborhood, out dryer exhausts outside. What's really odd is that since the house's walls are concrete internally they decided to have the dryer vent run through the foundation and come out near the ground outside. At first it got a lot of water in it following a hearty rain. I added an extension and elbow so that the pipe would point down. Now it has water again as a result of vapor build-up deposits. As you probably deduced it's pvc.
I guess I will have to suck the water out on a regular basis with my shop vac. It's a pain but still better than it exhausting in to the attic.
At some point I might try to have a new pipe run up into the attic and vented under the eave of the house.
Rebecca
11 Apr 2008, 09:21
We have just purchased a new dryer. Currently the dryer vent is only 3" wide through an outside wall right next to the dryer. So the entire length of vent pipe is approx. 2'. We have been told that we should increase the vent hole to the standard 4" but it is a brick wall and would be difficult. I am wondering if since the vented air is only traveling 2' to the outside will the 3" hole be okay with an adapter? Would it potentially cause damage to the dryer or void the warranty?
AsktheBuilder
13 Apr 2008, 19:31
Rebecca,
That reduction just at the wall should be okay. You need to run 4-inch pipe to the wall.
David
16 Jun 2008, 02:39
I live in a townhouse. Each house in the row is a mirror floor plan of the neighboring house. The basement access doors of the house are in a shared niche that it 10 ft deep from the back of the houses. The nook is around a total of 5 feet wide combined width inclding the neighbor houses access way.

The problem is the neighbor has installed the dryer vent at the base of their slanted basement door. The vent blasts moist scented exhaust which goes against our walls and windows. If we happen to have any of our four windows open which open into this alcove, our house fills with this exhaust. We cough, choke and eyes sting, not to mention the moist hot air. Is this vent location out of code? All the other houses vent on the very back of the houses.
lynn
17 Jun 2008, 11:30
The builder in our community vented the clothes dryer to the roof, we have vaulted ceilings. The dryer vent is clogged it goes up 15ft. and turns. I see this as an ongoing problem. what can be done. no way to revent no outside wall.Your expertise is appreciated. Thank you, lynn
chad hadley
20 Jun 2008, 20:44
Tim, my wife and I are renovating a house and will have 2 dryers, one upstairs for future use when we get older, and one in the basement we will use now. Can we vent both into 1 common outlet? thanks in advance and I love your site.
Michael
27 Jun 2008, 09:49
My gas dryer is connected to a 4" metal vent pipe that runs through a 2x6" piece of lacking in the wall. I a concerned that the vent pipe may get too hot to be in constant contact with the wood and drywall in the wall (it's too hot to hold my hand when the dryer is running on Medium heat). Should I enlarge the hole so there's a gap around the vent pipe as it passes through the wall? Should the gap be filled with fiberglass of some kind, or are there flanges to support the pipe and keep it from contacting the wall?

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