I would appreciate direction on investigating this water issue further:
I have had water dripping (from ceiling) during heavy rain , along inside wall of basement only on one side of the house. Fortunately, this is also not a chronic issue. It happened only during two spring/summer seasons in past 7 years. Only after super heavy rain I saw this 3-5 times one year, and 1-2 time the next year spring. Dripping along the wall, stops after the heavy rain stops. For past two springs, it has been dry along that wall and now I am finishing the basement, so could use help on what preventive/investigative steps I could take before framing the inside wall. My plumber ruled out any water pipe leak. It is a 1950 cape in northeast, with poured concrete basement wall.
- The first image shows the stain on the wall from the ceiling, from water drippings. You can see the same basement window in the second image from an outside view. Since the basement ceiling is well over 18 inches above ground level, I ruled this out as collected ground water coming back in.
- The second image is an outside view of the same basement window: The water dripping along inside wall is isolated to the right of this window, in this view.
- The third image shows the full view of the outside wall, including the gutter & pipes on roof. I believe the gutters are fine, and water discharges about 21 feet away from the basement though a buried gutter extension. There is no other puddle or wet wall outside I could detect during rain.
I am suspecting the problem is some leakage around the flashing on the roof coming down alone inside of exterior wall, or some seepage along the cracks on the outdoor wood shingles.
Suggestions on other areas I could investigate, are very much appreciated. Right now I am think of calling a chimney professional to check flashings on the roof, as the next step to investigate.