We moved into this house 4 years ago and since day one the area around the back wall has leaked. The wall was an "addon" to enclose a covered patio. 3 years ago we tried resloping the concrete in the area to help it drain away, but I think we worsened the situation. I'd like to know, if I had the chance to completely redo this area, how SHOULD it have been done? Grind the concrete down so it is sloped down, away from the house? Or bring the wall all the way out to the edge of the slab so water drains right off the siding?
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