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Posted by Jack on November 27, 2006, 8:03 pm
I had the same situation. If there is moisture under the floor, the vapor
will find its way up through the concrete. I painted the concrete with a
sealer -and- used those 2x2 dricore panels from HD as the sub-floor. It
wasn't cheap, but the floor is warm and the air spaces give the concrete
some breathing space (I know that sounds stupid but I don't know how to
explain it)
>I am in the process of remodelling our basement. Our home is about 2
> yrs old. I did not think that I had a moisture problem, except that on
> occasion, leaves would plug up the footing drain in a window well and
> water would come in the window. So I am going to address this issue
> outside. However, after reading many of the threads on this site, I am
> wondering about other issues.
>
> A little background. I have a single-story home with a full basement
> (about 2300 sq ft) with 9ft ceilings. About 6-8 in of the foundation
> walls are exposed on the outside. The walls are poured and have a
> spray-on coating on the outside. I have 1 larger crack (2-3mm wide)
> across the whole floor that has been there since it was poured, and I
> have recently filled that in and painted waterproofing paint over it as
> well as many of the other much smaller cracks. There were some
> hairline cracks in the walls stemming from two of the windows and I
> have sealed them as well. All of this was a precaution. I have never
> had moisture through any of these.
>
> I keep a dehumidifier running to keep it at 60% humidity, and it runs
> much of the year. It can collect 45 pints in a couple days in the
> summer at peak humid times. I don't know if this is abnormal or not,
> but there are no return vents on the 92% efficient furnace/AC in the
> basement, and that could contribute. Any thoughts would be appreciated
> on this.
>
> Here is the issue. We have a 12x20 area with carpet remnant layed over
> 6mil poly. When we started moving things around to build the walls, I
> noticed that the concrete under this sheeting is darker than the rest
> of the floor. After pulling a section back for a while, the color has
> lightened. There is no actual condensation under it, and it has been
> in place for about 2 yrs. After reading some messages and my DIY
> books, I am somewhat concerned.
>
> I have asked my builder about this, and he did not think there was any
> problem. The floor is 4 in thick concrete with pea gravel from the
> bottom to the top of the footings and there is drainage tile around the
> outside and inside perimeter of the footing leading to a sump pump.
> The pump runs normally a few times a day, rain or shine.
>
> Should I be concerned with this issue? Do I need to waterproof the
> whole floor to prevent moisture? I can't imagine that there is that
> much moisture under the floor with the drainage available under the
> floor. Could something not be working properly? Please help, as we are
> in the process of framing, and don't want to go too much further if
> there is something that needs addressing.
>
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