Shift as much as the next shingle row, offsetting the shingles horizontally by about 6 inches so the tabs are staggered. Just about every 3-tab shingle demands four nails, one above Every single tab groove. The nails need to be inserted three to four inches through the shingle’s bottom edge, https://excellentopolis.com/roofing-hail-navigating-insurance-claims-for-a-hassle-free-experience/