Does anyone have any ideas on how best to repair a basement wall in our home which we recently purchased and found behind the insulation and gyproc 2 areas which are leaking due to a crack the full height of the foundation and 2 areas where there is a "honeycomb" section approx. 6 inches wide running the span of one side of the house. These areas are leaking quite a lot, in fact, we've had to remove the foam insulation and gyproc to find the exact locations of the leaks, only to find a complete mess of rotted wood and wet foam insulation. We are trying to avoid digging up the outside wall of the basement and were told we could get a backhoe in to dig up just the areas in question and apply tar, followed with roof shingles (standard ones you put on with roof tar) with tar approx. 3 ft. on either side of crack, from top to bottom of wall over the footing, then cover. This is supposed to last a long time as asphalt shingle do not break down when covered in soil. Can you perhaps give me some advice.