Dryer Venting - Condensation


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Old 12-27-15, 09:11 AM
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Dryer Venting - Condensation

We just moved into our new home and noticed our clothes take more than 1 cycle to dry and at times there is water under the dryer. The laundry closet is in the center of our 2nd story, and is surrounded by hallways on each side. I'm pretty sure the duct venting is not to code and would like to fix it. The duct itself is the flexible foil type. It runs from the dyer up 8 feet into the attic and then snakes along another 20 feet before venting out a roof soffit. I plan to replace it with rigid duct.

Should I run the rigid duct out the soffit as well? My roof slopes downward on all sides of the house and if I want to come out a wall, I would need to put in a 90 to go from the attic back down into a bedroom wall and a 90 to turn horizontal again out the wall.

Any advice would be appreciated.
 
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Old 12-27-15, 03:54 PM
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The duct should be completely buried in insulation. If it isn't, that's probably a lot of the condensation problem. The dryer being slow could be a partial restriction in the line. Foil is good assuming its flexible rigid and not the cheap kind thats baggy with wire... but it should not have any sharp bends. The run sounds kind of long. Check the vent where it exits the house for any blockage. Check the airflow at the exhaust, see if its strong.

Have you removed the parts of the line you have access too and checked for lint?
 
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Old 12-27-15, 04:08 PM
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Vent should never run of a soffit.
The hot most air gets sucked back into the attic.
Out a side wall or the roof only.
Center of the house is the last place for a laundry room, go figure.
No way is flex duct allowed behind and wall.
 
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Old 12-27-15, 06:29 PM
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The duct is the wire type and it's laying on top of the insulation in the attic and has dips and bends over my HVAC ducts. I've pulled handfuls of lint from both ends as you can imagine. Airflow is pretty weak as well.

Is there any issue if I routed my new duct 8 ft up to the attic, a 90 degree bend then across the top of my joists for 15ft then another 90 degree bend before going 2ft down to another 90 out the wall?

Code in my area is 35 ft and that's 35 up to the last 90 going out the wall. I don't think there's any other way besides the roof.
 
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Old 12-28-15, 04:46 AM
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Flexible duct is okay behind the dryer but it should change to solid smooth 4" duct as soon as possible. Generally anything that goes through a wall or across your attic should be solid pipe, solid elbows. If its not, change it. Then cover it with insulation. Generally you try to vent out a gable end, not out a soffit, for the exact reasons joe mentioned.
 
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Old 12-28-15, 01:06 PM
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Running out a Soffit is fine if you don't have soffit vents are you block them off up to a few feet a way.
 
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Old 12-30-15, 02:06 PM
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Thanks for the responses. I changed it out to rigid duct wrapped in insulation but kept it going to the soffit for the time being. In the spring I plan to run it out a bedroom wall. We have a hip roof so there isn't a gable end I can come out of and I would still like an easy way to clean it out without getting on the roof.
 
 

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