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n0c7 06-29-2011 10:35 AM

New dryer vent moisture
I just installed my brand new dryer in the basement. The floor is painted concrete. When I run the dryer I get a slight haze of moisture on the floor around the wall dryer duct opening/flex pipe connection. The dryer duct runs into an insulated drywalled wall and directly up to the outside. I cannot feel any air leaks and made sure all the connections are tight and that there are no tears in the semi-rigid connection pipe.

Is this just a reaction because the floor is so cold yet the vent is hot? As soon as the dryer is off the moisture almost immediately dissipates.

gregzoll 06-29-2011 11:00 AM

What you are seeing, is caused by heated air hitting cool air, which is dew point. You may want to check the humidity level in the basement, or living space. Too high, allows mold spores, etc, too low causes other problem. Should be within 50-60%.

n0c7 06-29-2011 08:46 PM

Humidity level in the room is within check. Basement floor is very cold to the touch however room temperature is about 22C(72F).

gregzoll 06-29-2011 09:09 PM

What you are seeing, is typical.

n0c7 06-30-2011 12:29 AM

Is there anyway to prevent it?

gregzoll 06-30-2011 09:55 AM

Try to spin a little more moisture out of the clothes. This effect happens with every dryer, due to you are talking about moist heated air, until the clothes dry. Also make sure that the vent is opening all of the way on the outside of the home, so that there is sufficient airflow for the dryer vent.

n0c7 06-30-2011 11:29 AM

So I guess my only really concern is if this will be a problem over time and cause the drywall and insulation to rot around that opening?

gregzoll 06-30-2011 12:00 PM

Not really. Only way the paper would rot, would be water dripping on it. There is no worry about it, it is typical behavior when venting a dryer. If it is a gas dryer, you tend to see this more often, but with an electric dryer, it is typical. I tend to make sure that my clothes are spun in the washer, so as not to be dripping wet when placing into the dryer. In all reality, check your humidity levels, because any moisture in the are, is causing the Dewpoint effect. Cool moist air, meeting warm air causes this, but again, no worry, because it is not damaging.

n0c7 08-26-2011 12:13 PM

Well after two months this is what it looks like:

This can't be normal. There has to be an air leak inside the wall. If I shove a paper towel between the drywall and floor gap after 20 minutes its fully saturated. The flex pipe is tight and no air leaks can be felt. The portion of the drywall that is stained it hot to the touch when the dryer is running but the rest of the area around the opening is not.

gregzoll 08-26-2011 12:46 PM

I would be looking at leaking drain pipe, or water pipes for the washer at this point.

n0c7 08-26-2011 01:43 PM

Doubtful - I saw this wall before it was drywalled and the plumbing pipes aren't near it.

gregzoll 08-26-2011 02:03 PM

Moisture is getting in there some way, and it is not coming from the dyer. What is above this space? Post pictures of the outside where this vent exits.

Marty S. 08-26-2011 04:46 PM

Disconnect the vent and look up the pipe in the wall with a mirror and flashlight. Bet it's not clean and the humidity is condensing and running back down the pipe.

COLDIRON 08-26-2011 05:02 PM

Turn the dryer on let it heat up go outside and make sure your vent is blowing hot air and the right volume. Your pipe might go in the wall and disconnected inside.

gregzoll 08-26-2011 05:16 PM

That is what I am thinking Marty & ColdIron. Either they are getting blow in from rain, as you both have said, either clogged vent or disco.

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