Interior water handle aas a rule entails sealing joints and penetrations where outdoors moisture migrates

https://wiki.seti-hub.org/w/index.php?title=Balconies,_Parapets,_and_Water_Control:_A_Design_Perspective

Interior water regulate many times comprises sealing joints and penetrations where outdoors moisture migrates. This helps safeguard ceilings, insulation, and construction features.