Go as much as the following shingle row, offsetting the shingles horizontally by about 6 inches so which the tabs are staggered. Just about every three-tab shingle demands 4 nails, just one over each tab groove. The nails should be inserted 3 to four inches through the shingle’s bottom edge, https://cruzxmfxl.blog-ezine.com/26838001/the-roofing-contractor-diaries