...number of nails to the pound in each instance: Purlin angle 2X2ins. 2'^XS ins. 3V$X3Kins. 4X4'jins. Length of nail 4 ins. 5 ins. 6 ins. 7 ins. No. of nails per Ib 48 38 33 27 The nails should be placed through the top of every second or third corrugation. At the eaves of the...