Lay out 30-lb. asphalt roofing felt paper and nail it in place using 1 1/4-inch galvanized roofing nails. 8. To lay out the design for the shingles, begin at the bottom of the roof and place a tape measure 1/2 inch from the edge of the roof to ensure the shingles overhang the drip edge.Mar 28, 2016read more >>