how far should shingles overhang drip edge
The general consensus seems to be that shingles should extend over the drip edge by 1/4 to 3/4 of and inch depending on the roof pitch and area of the country. The camp is in the western mountains area of Maine, Oquossoc/Rangeley and I figured 1/2 shingle overhang would be right for the area./ insert a second drip edge 1/4 to 1/2 away from the existing drip edge. 3/ insert a 3-6 inch section of single shingle between the drip edge top and the existing shingle to get the 1/2 inch past the drip edge.