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Dehumidifier and basement wall yoman 08-24-2006
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Posted by yoman on August 24, 2006, 5:44 pm
So, a couple of weeks ago I bought a dehumidifier for our unfinished
basement - the walls are poured concrete. After a couple of days I
noticed a horizontal dark line about two inches wide stretching along
one of the walls. It starts in a corner and just ends a few feet along
the wall. It is under the level of the soil outside - the ground
outside is well graded away from the house, and it hasn't
rained much recently. The line does not feel wet to the touch. I assume
this has something to do with the humidity in the basement decreasing
relative to the moisture in the ground outside/in the walls?



Posted by zidar on August 24, 2006, 7:05 pm
yoman wrote:
> this has something to do with the humidity in the basement decreasing
> relative to the moisture in the ground outside/in the walls?
>

Probably. I don't have dehumidifier, but I also have those lines at some
places.

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Posted by Art on August 24, 2006, 10:44 pm
Is this a new house?


> So, a couple of weeks ago I bought a dehumidifier for our unfinished
> basement - the walls are poured concrete. After a couple of days I
> noticed a horizontal dark line about two inches wide stretching along
> one of the walls. It starts in a corner and just ends a few feet along
> the wall. It is under the level of the soil outside - the ground
> outside is well graded away from the house, and it hasn't
> rained much recently. The line does not feel wet to the touch. I assume
> this has something to do with the humidity in the basement decreasing
> relative to the moisture in the ground outside/in the walls?
>
>



Posted by on August 25, 2006, 10:05 am

Art wrote:
> Is this a new house?
>
>
> > So, a couple of weeks ago I bought a dehumidifier for our unfinished
> > basement - the walls are poured concrete. After a couple of days I
> > noticed a horizontal dark line about two inches wide stretching along
> > one of the walls. It starts in a corner and just ends a few feet along
> > the wall. It is under the level of the soil outside - the ground
> > outside is well graded away from the house, and it hasn't
> > rained much recently. The line does not feel wet to the touch. I assume
> > this has something to do with the humidity in the basement decreasing
> > relative to the moisture in the ground outside/in the walls?
> >
> >

It's 12 years old.


Posted by Art on August 25, 2006, 11:03 am
You might try turning off the dehumidfier for a few days to see of the whole
wall darkens to match the line. That would be what I would expect.


>
> Art wrote:
>> Is this a new house?
>>
>>
>> > So, a couple of weeks ago I bought a dehumidifier for our unfinished
>> > basement - the walls are poured concrete. After a couple of days I
>> > noticed a horizontal dark line about two inches wide stretching along
>> > one of the walls. It starts in a corner and just ends a few feet along
>> > the wall. It is under the level of the soil outside - the ground
>> > outside is well graded away from the house, and it hasn't
>> > rained much recently. The line does not feel wet to the touch. I assume
>> > this has something to do with the humidity in the basement decreasing
>> > relative to the moisture in the ground outside/in the walls?
>> >
>> >
>
> It's 12 years old.
>



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