Participants will explore the importance of air barriers, vapor control, and thermal control in wall assemblies. They will recognize components leading to moisture penetration, understand upcoming changes to building code for Whole Building Airtightness Testing (WBAT), and summarize the benefits of continuous stone wool insulation for rainscreens. Additionally, participants will identify proper rainscreen details and gain basic knowledge of WUFI hygrothermal modeling. This course equips architects and building professionals with essential skills for designing efficient, durable, and code-compliant wall systems.