After three trouble free years my sons basement has begun to develope leakage on half of the back wall at the junction between the floor and the block wall. The soil is all sandy and there is generous grading away from the house for 15 to 20′. There are no gutters or drain tiles since I’ve never needed them in the past in this area. Only one water pipe exits in the back and thats not leaking. The spoting has appeared after a rain and several days after the last rain. The house is on city water and sewer. How can drainage in the yard seep under the footings to rise up through the seam? Would I learn anything by drilling a hole through the floor near the leaks? I don’t want to button the wall back up until the cause has been identified and cured.
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I'll bet, if you look more closely at the grading outside the house, you'll discover that some areas right next to the house have subsided. Build them back up to their original slope and you'll probably be OK.