Risers, shared stacks and sealed units
Towers rely on risers and drain stacks that serve many units at once. A blockage in a stack can push waste water back into the lowest connected fixtures, and a failed riser valve can flood several floors. Because the building is sealed and air conditioned, humid air stays inside, and wet drywall or carpet padding can stay damp for a long time.
Condo layouts also bring concrete floors, built-in cabinetry, stone countertops and wood or tile finishes that react differently to moisture. Balcony doors and window walls can leak in a heavy storm, which is another route for water that many owners do not expect. Careful moisture mapping separates the wet from the dry.

