Help me understand window detail in Dr. Joe’s “Deep-Dish Retrofits”, please!

Thanks in advance for your time and thoughts!I’m considering applying the methods outlined in Dr. Joe’s 2014 article:https://buildingscience.com/documents/insights/bsi079-deep-dish-retrofitsBut I’m having a hard time with the detail at the top of… Thanks in advance for your time and thoughts!I’m considering applying the methods outlined in Dr. Joe’s 2014 article:https://buildingscience.com/documents/insights/bsi079-deep-dish-retrofitsBut I’m having a hard time with the detail at the top of…Read MoreGreenBuildingAdvisor