[Candy1]

We have had moisture problems with our concrete floor in our bedroom. Luckily we haven't laid carpet yet and hopefully can fix this problem. We discovered mildew in a corner on the north side of the room. We have a downspout there that is connected to an underground drainage system. We had a large storm and forgot that it wasn't completely connected, so the ground is quite wet and in the winter doesn't really ever dry out. We sealed about 2 1/2 ft. Of the floor from the wall corner to corner. Now just under the window there is water on the floor. The windows sweat, but that isn't where it's coming from, at least not spilling over the sill, they don't sweat that much. Should I try another sealer or is the moisture around the window somehow seeping down the wall to the floor? Or, is it coming from the ground? I didn't see any threads that covered a sealed floor,unless I missed one. I hope someone has encountered this or has some words of wisdom!

 

[SeniorSitizen]

There is a possibility of finding the answer by taking a temperature reading of the concrete in that area just below the window and comparing that temperature to the dew point temperature of the air near floor level.

 

[joecaption]

You can try all you want to seal that floor from the top side but it's not going to help.
All the work neds to be done on the outside.
I own a block home that the slab was pored below the finshed grade.
It got so bad I had water coming in through the tile.
I dig out around the foundation and added a french drain, water proofed the outside wall.
Added a sepperat line to run the gutters under ground to a sump pit with a pump to get the water out to the ditch by the street.
It's never leaked again.
It's never leaked again.