All plywood sheets have the same 4-foot width, but you can buy sheets that are 8…

All plywood sheets have the same 4-foot width, but you can buy sheets that are 8- 10- and 12-feet long. If you're installing the sheathing vertically, the use of longer sheets allows you to avoid making horizontal seams in the middle of a wall. This improves water resistance and insulation.

Source by leeloolemon