Tape Measure Standard Spacing

The usual spacing between 2 x 4's in a wall is 16 inches on center. You'll see an arrow on your tape measure at 16, 32, 48, 64, 80 and 96. The spacing between larger structural members, such as roof rafters and trusses, is often 24 inches. You'll see an arrow on your tape measure at 24, 48, 72, 96 and so on. Note that both series of numbers come out even every 48 inches and every 96 inches. That is because the standard size of a sheet of plywood is 4' x 8', or 48 inches by 96 inches. The ends and edges of every sheet of plywood will have a nailing location with standard spacing.