Building envelope systems and continuous air barriers has gained prevalence in the marketplace with inclusion into building and energy codes over the last decade. This presentation aims to bring awareness of code requirements as they relate to building envelope components and systems and shed light on common material misconceptions. Additionally, this presentation will focus on the all-important tie-in junctions which have been known to cause confusion resulting in leaky buildings and system failure. We will discuss tie-in design considerations, known product incompatibilities, as well as tie-in installation best practices.