A laser level comes in handy so you can align the ceiling plate directly over the floor plate. Before attaching the ceiling plate, however, lay it on the floor beside the installed floor plate; use a measuring tape and a straightedge to make pencil marks on both to indicate the placement of wall studs. Standard studs are 16 inches apart, measured from the center of one stud to the center of the next stud. Attach the ceiling plate using the same nailing pattern used for the floor plate. The ceiling plate will attach either to the ceiling joists it crosses or to the blocking. here