Obvious cracks, tipping, and basement settling provide clear indication of a foundation that has been weakened and needs to be restored. However, many other issues may also signal that your foundation is faulty. They include: Chipping or cracked concrete Popped out nails Gaps at the tops and bottoms of walls Bouncy floors Windows out of square Leaks in basement walls or floors Cracks in drywall Uneven or sagging flooring Jammed doors and windows Misplaced moldings Cracks in floors Gapping around chimney Misaligned doors and windows