How to slab foam to wall foam

What is the proper way to marry the 4″ XPS foam to the 2 layers of 1.5″ XPS foam that I will be installing on the OSB sheathing? Do I… What is the proper way to marry the 4″ XPS foam to the 2 layers of 1.5″ XPS foam that I will be installing on the OSB sheathing? Do I…Read MoreGreenBuildingAdvisor