To make sure the nails don’t threat being uncovered or interfere with the shingle sealant system, they should be located about three to 4 inches from the outside fringe of the shingle. Whether installed at the eave or the rake, the starter shingles ought to overhang the edge of the roof by ¼ inch to ¾ inch.
It adds a second layer to the bottom shingles in order that the complete roof now has two shingle layers. You do need to use a starter course with architectural shingles. The starter edge will assist seal the sides and cover your shingle joints. As it gained’t be visible on the finished roof, you don’t want to fret about the look of your starter strip and whether it matches your architectural shingles. You can as a substitute use the identical starter strip that you simply’d use for 3-tab shingles.