Windows, Flashing, and Water Management in Modern Wall Assemblies

This hands-on session demonstrates practical strategies for window installation and flashing integration within modern high-performance wall assemblies. Using both flanged and flangeless window conditions, the session will explore how windows are integrated back to the WRB layer, how openings are prepared in anticipation of exterior insulation, and how sequencing decisions affect long-term water management and durability. Time permitting, the session will also address common penetration and flashing details such as line-set penetrations, drip caps, and related transitions.

Learning objectives

• Identify the core steps required to prepare and flash a window opening in a modern wall assembly.
• Compare flanged and flangeless window installation approaches and understand where each may be appropriate.
• Understand how windows are integrated back to the WRB layer and coordinated with future exterior insulation thickness.
• Recognize common failures in opening preparation, sequencing, and water-management detailing.
• Apply practical flashing concepts to related penetrations and transitions in the building enclosure.