1) if your installing 3 tab shingles as mentioned then you have a rain row to guide the sequenced layment of each course (one atop of the other) from bottom to top... otherwise they are strip shingles(architectual, and then you align the line printed on them)
2) nothing wrong with the other suggestion(s) relating to pitch and coverage to the weahter... the flatter the more coverage is needed. Most three tabs call for 5 1/4" to the weather, or said differently, bottom of tab of latest laid shingle (one on top) needs to be just even with the rain row slot/ on top of the shingle underneath, generally speaking. However as said, the flatter the roof surface the greater the coverage must/should be, said another way, more of the rain row slot must be covered to guard against siphoning and ice damming.
3) Vertical roofing installation is nothing new, some actually prefer because of scaffolding changes, however, the surface needs to be really good, per seŽ new plywood as alignment problems are crucial to good assembly when using vertical method(s). And, some do not prefer because there is a lot of lifting shingles up and down to install the next sucession of shingles laid the horizontal distance of the next vertical section to be installed. But, vetical layment method "is" best for steep roofs -- less moves and less cuts for sure !Lastly, but actually the first question, the strip stays on, if it is a good quality shingle then "all"directions are included on the outside of the packages ( in thirds-- 3 equals 1 square... ect)
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