Curtain wall and facade water intrusion most often contains air and water paths

https://wiki.tgt.eu.com/index.php?title=Above-Grade_Waterproofing:_Protecting_Roofs,_Facades,_and_Roof_Decks

Curtain wall and facade water intrusion traditionally entails air and water paths. Proper flashing, weeps, and power equalization facts can enhance development handle.