04:26PM | 08/06/04
Member Since: 08/05/04
2 lifetime posts
I have purchased a small home that is on a slab. After noticing a hump in the floor and a dark area on the linoleum I pulled up the linolium to investigate. The previous owner added a bathroom on the other side of the house. In order to get water there and waste water away he cut a trench in the floor and put in hot and cold waterlines and a 3" sewer line. The concrete he poured(4") heaved in several areas. There was mold on the bottom of the linolium.

I busted up a ten foot section and dug down about 2 feet to find the mentioned lines/sewer. there was standing water in the hole. the water subsided during the next few days. After a good rain the water in the trench rose about 2". Then subsided.

The water lines have continuos pressure, so I assume the water is not coming from them, as the water would continue to rise.

The gutters were plugged solid when I first got the place. There is good fall away from the house. The down spouts are intact and flow out to the street when I put a hose down them. I have run the water into the sewer line for 4 hours. This did not make the water rise. The last rain did not effect the water level((just a dribble. All the duct work is in the floor, they all have a small amount of water at the bottom.

I have dug a hole on the outside of the house along the footer in the area of concern, have not gotten down all the way yet, but so far its dry as a bone.

Any Ideas, I am stumped. I do not want to put it back together ubntil im sure what the problem is.


04:44PM | 08/08/04
Member Since: 01/28/03
693 lifetime posts
The problem is likely that in the course of demolishing the original floor to install the pipes for the new bath, the former owner cut thru the required polyethylene sheeting below the slab, removed it, and never properly replaced it.

In fact, it is not possible to correctly replace the polyethylene vapor barrier under an existing concrete slab once it has been compromised unless you can lap and seal the poly sheets as code requires.

The issue seems that water from water table rises is getting to the concrete level and since concrete is porous and acts like a sponge, is wicking water up into the concrete slab.

You see the results.

The correction seems to be to cut back the floor to expose the original plastic sheeting, add a patch of new sheeting making sure it is sealed all around against water, then re-concrete.


05:50AM | 08/09/04
Member Since: 08/05/04
2 lifetime posts
The house does not have any vapor barrior. Since the last post I dug a hole alonr the foundation to the bottom. It is every bit of 36", but has no footer drain. There is no sign of moisture in the hole, solid clay and no moisture. I even went about 6" below the bottom of the footer to be sure.

Now Im thinking a waterline leaking under the slab or that because there was soil against block of house above the footer. The block is porus and may be possible the water entered below the slab, through the block. I guess it depends on the hieght of the slab in reference to the block. Thinking about digging another test hole on the otherside of the house to be sure.
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