Step 17: Finish the Runs

finishing the runs for three-piece crown molding
Photo: Wendell T. Webber
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Work around the room until all molding is installed. Remove the painter's tape from the walls and ceiling. Caulk nail holes, joints, and seams. Lightly sand the assembly with a fine-grit sanding sponge, and finish by applying two coats of semigloss paint.
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    Tools List

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    • 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

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    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