I have a 2-year old home with poured concrete walls. During a couple of recent heavy rains, have had water coming through a spot in wall about 1 foot off floor. Wall above this area has a small crack that runs from top of wall to about 3/4 of way down the wall (but not to where water comes in). Previous owner painted walls with Drylock. Outside of walls are only damproofed (asphalt), not waterproofed. How can I "repair" the wall to keep from leaking? Thanks.