A newly finished bathroom can look perfect. The tiles are clean. The fixtures are installed. The ceiling below looks brand new. Then, several months later, a dark stain appears. Paint begins peeling. Moisture develops along the wall. Water starts dripping into the room below. At that point, the problem is no longer only waterproofing. It may now involve removing tiles, opening ceilings, replacing damaged finishes, checking electrical components, repairing paint, and disruptin