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lepore88

03:14PM | 12/17/03
Member Since: 12/16/03
2 lifetime posts
Bvbasement
Five weeks ago we had installed professionally French drains in our basement. We had some water problem (not major)I would say 2x in 5 yrs (about 1/2 bucket full for 1800 sq ft basement. This week we had 20 inchs of snow follwed by warm weather and rain the following week. We began to see spots of water marks along the perimeter where new cement meets the main foundation (not at the walls). We did not see spots at center of the new cement where drains were installed. I tested the sub pump and it works well, however, the contracter claims it is condensation from the cold foundation to the damp room(go figure) while the temperature of the basement was 60 degree F and I measured the water in the sub pump to be 55 and the humidity to be 60%. I think this is water rising from the drains because of pooling (poor drainage). I need a second point of view on this one. I also need a fix for this problem. Has anyone encountered this issue before?

Thanks

Piffin

01:17PM | 12/27/03
Member Since: 11/06/02
1281 lifetime posts
I'm not sure what you are calling French drains.
In my experience, a french drain is placed just below the ground surface outside the house to attempt to provide surface water a way to run off before finding it's way down to the foundation, where you report problems on the inside.

With a hunidity level of 60% it could easily be a condensation problem. Indoor humidity should be no more than 40%. That is a level that is healthy for people but a house is happier at 15-20%.

To test, take a piece of plastic about two feet square and use duct tape to seal it down to the concrete floor for a few days.
If you find moisture under the plastice, between it and the crete, then the moisture is coming from still curing concrete or from water under the slab. If the moisture is found on top of the plastic, it is surely from condensation.

I am also not sure what is meant about meeting of new and old concrete. Is this just a patch where the old was cut out for drain material or was a whole new slab poured? Was a 3 or 4" perforated drain laid into stone under the slab? Was a vapour barrier used before the slab was poured? This picture is incompleete.

cellarwater

12:14PM | 01/04/04
Member Since: 12/09/03
175 lifetime posts
You sound pretty wet!! I'm in New England and the rain and snow has been crazy here! Check the water level in the sump when the pump starts. If it's close to floor level adjust it down & see if that helps any. Write back if there is any more questions.C.
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