Basements can leak for many reasons, including failed or aging exterior damp-proofing, clogged or broken weeping tiles, poor grading around the home, foundation cracks, high groundwater, or blocked drains. In older homes, original waterproofing systems may simply have reached the end of their lifespan. A professional assessment helps pinpoint the true cause so the repair plan addresses the source of the problem instead of just treating the visible symptoms.