Leakage from pipes running through shafts, kitchen and bathroom are most common source of dampness in interior walls. At times the source of leakage might be a crack on the terrace from where water enters the structure and accumulates on the interior wall, showing as dampness. Places which have a high ground water level are bound to have a higher chance of dampness in their walls as water from the ground seeps into the walls resulting in walls getting moist and even causing structural damages in the form of cracks.