Specifics - low slope porch gable roof, about 3/12 slope with 3 tab shingles.
Is there a minimum distance from the wall and flashing that I should avoid nailing a shingle tab? I am assuming that on a low slope roof there is a good chance that water can move horizontally some distance away from the wall. In the picture I’ve attached it doesn’t seem unreasonable that water (red) could reach a nail (blue) a half tab from the wall. Should I avoid nailing this close to the wall? What about the a full tab from the wall? Recommendations? Thank you in advance!