Step 13: Mark the Corners

marking a molding for an outside corner for three-piece crown molding
Photo: Wendell T. Webber
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To mark the miter cuts for outside corners, you'll first mark the ceiling for the upper molding (and the soffit for the lower molding, as shown) to see where the ends of the pieces will land. Position a scrap piece of molding in place so that one end extends beyond the corner. Trace a light pencil line onto the ceiling (or soffit) along the top edge of the molding, extending the line past the corner. Repeat for the other side to create a set of crosshair marks. Position the length of molding to be installed along this line and the fascia (or wall) so that one end extends beyond the corner. On the face of the molding, mark the spots where the top edge meets the crosshair line and the bottom edge meets the corner. Draw a cutline on the face of the molding between these marks. Repeat for the other side.
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    Tools List

    • studfinder
      stud finder
    • chalk line
      chalk line
    • miter saw
      miter saw
    • coping saw
      coping saw
    • drill
      drill/driver
    • brad nailer
      nail gun
    • hot glue gun
      hot-glue gun
    • hand clamps
      spring clamps
    • caulk gun
      caulk gun
    • sandpaper
      fine-grit sanding sponge
    • chisel-tip paintbrush
      paintbrush

    Shopping List

    Primed crown molding. Select a larger profile for the upper run and a smaller one for the lower run. To calculate how much to buy, round the length of each wall to the nearest foot and add the lengths together. Get tips on sizing crown molding to suit your space

    Primed fascia board with a decorative profile on one edge.

    Primed 1x6 soffit board

    2x2 for cleats on the walls and ceiling, to which the half beams will be attached.1x1 for the nailing strip that will help you join the soffit and fascia boards.

    2x4 to rip at an angle for making backing blocks for the gable ends of the room.

    Painter's tape

    1¼-inch and 3-inch screws

    1¼-inch and 2-inch finishing nails

    Toggle anchors

    Paintable caulk

    Semigloss paint