When I have a removed a few old roofs, I've noticed cedar shakes along the whole bottom edge of the roof.
What was the purpose and should I leave them if they are still solid? (ok I added this question while writing this)
Now for the advice question
I have a 4 sided steeple with a 3/12 pitch on 1 corner of the house that I am re-roofing. All the cap shingles running down the ridges have the 2 nails covered by the next shingle but on each, at both of the lowest corners about an inch in has a trim nail. This on both layers. Should I do this on the new roof?