putting up half beams for three-piece crown molding
Photo: Wendell T. Webber

Step 6: Put Up the Half Beams

Countersink pilot holes every 12 to 16 inches through the fascia and soffit. Lift the half beam into place, and drive 2-inch screws through the pilot holes and into the cleats. (Since you added inch to the marking block in Step 1 to clear wall imperfections, there may be gaps between the beam and the walls or ceiling. These will be covered when the molding is installed.) Repeat for the adjoining half beam. Connect the beams by driving 1¼-inch screws through the end of the second beam's soffit and into the connecting block on the first beam. Repeat for the remaining half beams.
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    Tools List

    • studfinder
      stud finder
    • chalk line
      chalk line
    • miter saw
      miter saw
    • coping saw
      coping saw
    • drill
    • 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

    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