Watertightness performance of face-sealed versus drained window-wall interfaces

Several research studies have identified window-wall interfaces as one of the major sources water ingress through building envelopes. Window-wall can either be sealed by means face-sealed or drained sealing systems. In general, it is assumed that show an improved rainwater resistance compared to interfaces. However, only a limited number found in literature evaluating watertightness performance both and The objective this paper evaluate methods identify primary factors affecting Various combinations exterior seal, drainage layer, air barrier, airtightness level, installation method wall assemblies were assessed 5 test specimens 9 specimens. Both static cyclic tests performed. It was showed corresponding results with regard pressure threshold value for ingress. study also indicated presence separate barrier at interior side interface affected great extent. findings very difficult obtain resistant interfaces, even lab conditions. therefore recommended always provide possibilities behind seal cladding.