Vertical studs are normally spaced 450mm apart, measuring centre to centre. If you are putting a doorway in the wall, leave a space that includes enough room for the door and the doorjamb. The distance between the top and bottom plates may vary slightly, so measure the length for each individual stud. Nail the stud into place with your nail gun. To keep the studs steady while you are installing them, brace them by nailing a small offcut into the top and bottom plates. If you are leaving room for a doorway, always nail away from the door cavity.