Shift approximately the next shingle row, offsetting the shingles horizontally by about six inches so the tabs are staggered. Each 3-tab shingle requires four nails, 1 higher than Every tab groove. The nails needs to be inserted 3 to 4 inches within the shingle’s base edge, plus the nails on https://josuerhuh69787.ampblogs.com/5-tips-about-roof-you-can-use-today-63539579