4But many tape length gauges add red numbers (or some other graphical salient) every 16 inches; This is a very common spacing for nails in house framing. This spacing allows for six supports every 8 feet of length. So in a perfect world, you should be able to make pencil engravings on your red marks so that you can easily determine the placement of the nails. Now, if you want to find a center between the nails, black diamond will be your best option.
