After removing all of the damaged wood, it was time to replace it with new wood.
The remaining shingles were removed from the part of the tower that had the water damage. The rotted out sheathing was replaced with new wood.
New felt was added from the top of the wall to the bottom.
Fitting in the last piece of new felt.
In order to safeguard against future leaks, I also added a strip of metal flashing on the outside corner of the wall.
Then, the shingles were put back on. Any shingles that were in bad condition were replaced with new ones.
Close-up of the upper part of the shingled wall. The new piece of decorative wood has also been installed.