My home inspector and myself failed to catch a major design flaw regarding the foundation at the front of my 11 year old townhouse I purchased a year and a half ago. There is a U-shaped outside space that is bounded by 3 exterior walls (my garage, the front of my townhouse and the garage wall of the adjoining townhouse). The front wall is approximately 10 feet wide. The top of my poured foundation is just a few inches above the soil line. This has created two major problems: 1.) when it rains hard the water literally will flow over the sill plate into the basement. 2.) the plywood that caps the joists is rotting in this location because it is wicking up moisture.
The major obstacle I'm facing is that I cannot significantly slope (or lower) the soil away from the foundation because the curbing and driveway (about 25 feet away) is more or less level with the top of my foundation. A possible solution I have been kicking around is to dig down about 18", slope the ground underground, put down a waterproof membrane and replace the soil. Does this make any sense? Would a dry well help me in a situation like this?
Also I'm getting water in basement where the PVC sewer pipe exits the foundation And it's not always when it rains. The temperature has been below freezing and I'm still getting a few buckets worth a day. I have french drains and sump pit, but I would like to stop the water. I have been hesitant to simply plug the gap with hydraulic cement because I'm concerned about the hydrostatic pressure. Any help/suggestions would be greatly appreciated as I'm at my wits end.
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