Water leakage can have very serious consequences and should quickly find its origin.
Where possible, the method is to locate the leak on a rainy day, under the roof with a flashlight. The raindrops shine in the light beam; just follow their path to trace the source: a tile often moved, broken, or flashing cracked.
Caution! seek the origin of the leak: water dripping in one place can come from several meters above.
522 rue de courcelle # 206