I noticed the other day that when my wife was doing a considerable amount of
drying, that there was condensation in the dryer vent piping.
The piping comes from the upper floor, down through the main level into the
basement and then goes to an exterior wall and exits our home.
I noticed dripping from the vent piping at the 90 degree turn in the
basement where it comes from the upper levels.
Is this normal? Don't know that I have ever noticed this before, mainly
because it is not something have ever looked for.
Sounds like the vent pipe may be to long. Check with the dryer manufacturer
as to the maximum length and bends allowable for the machine. You have
hot,moist air flowing through it, and the longer it is, the more opportunity
it has to cool and condense
Good point. I will look into it.
The day she was doing the laundry and I noticed the condensation, it was a
very very cold day, which makes me think that I need to check the outside
vent to see if any cold air could be getting in.
I am also thinking about purchasing a dryer vent cleaning kit to make sure
that there is no major buildup of lint so that the dryer is able to properly
I had a similar problem with my dryer vent passing through the attic. I
insulated the duct with duct wrap and it has been fine since. You might
want to make sure that your vent pipe is clean. Too much lint will absorb
moisture and restrict air flow.
Thanks for the advice.
Being in a heated basement, I am not sure the duct wrap is necessary, though
I did see a very lousy / non-existent attempt to tape the joints between the
sections of vent pipe. I agree that I should make sure that the ducts have
In my own situation, while I did not have moisture dripping, I found that
aluminium pipe draws the heat out causing condensation. The moisture inside
the pipe quickly gathers lint, so much that I was having to clean out the
pipes every 3 months. The 4 inch diameter tubes had about 1/2 to 3/4" of
lint stuck to the tube walls.
I replaced the run (this is for an electric dryer, do not do this for a gas
dryer) with 4" PVC sewer/drain pipe. I have not had to clean it out for the
past 12 years. The plastic pipe holds the heat in and prevents or reduces
any condensation. My idea to use PVC was based on seeing furnaces that used
ABS or PVC drain pipe as a vent.
Really good idea. though it would be major surgery to replace the 16' run
from the dryer upstairs (3rd level) to the basement.the basement run would
be simple. How did you connect from the dryer to the PVC?
I am almost scared as to what I will find in the vent ducts when I clean
I used a short length of flexible vinyl tubing, just enough to allow me to
make the connection and move the dryer that last few inches against the wall
after I had extracted myself. Had to reduce the diameter of the PVC sewer
pipe slightly to fit the vinyl tubing over it. Used a heat gun to soften the
pipe and a tightened large gear clamp to shrink the diameter until it was
the right size. Worked like a charm.
16' is not too long for a dryer vent, although the shorter the better.
Have you considered terminating the vent to the exterior near the
If you need help with the cleanout, which is clearly needed, visit
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