A galvanized metal flashing, air-sealed to the rim and foundation with adhesive, provides a starter strip for the foam sheathing and protects the bottom edge from burrowing bugs, rodents, and flying sparks. The attached insect screen was later folded up over the ends of the vertical vent strips behind the siding.
Expanding foam seals random cutouts in the rim joist. The first layer of 2-inch foam is installed vertically and sealed and bonded to the frame with adhesive.
Before framing the unheated attached garage, the author applied foam sheathing to the common wall, establishing a thermal break between the two structures.
Structural screws driven through the foam tie the isolated frames together. Here, the author anchors a walk-out bay rafter to the wall framing.