Except where walls are brick the vertical part of the sidewall flashing should extend up behind the exterior wall covering just like with headwalls.
Walls between roofs.
If there were no flashing against these walls water could slowly drip into the crevice between the wall and the roof and potentially into the home.
This is what we typically get in the real world today figure 6.
A sidewall is a junction between a wall and a sloped portion of a roof.
Damaged or improperly installed roof flashing especially around the chimney or dormer is one of the most common causes of roof leaks.
The horizontal part of the flashing will vary depending on the type of roof covering material.
Like rain snow sleet wind and hail.
It is because the intersection between the roof and the exterior wall covering is not properly installed and flashed.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
Continuity of the control layers between roofs and walls is the whole enchilada.
This oversight has been going on for years and costing property owners many thousands of dollars.