Step 3: Reinforce the Outside Miters.

To prevent the outside miters from coming open, glue and screw small reinforcing blocks to the backs of the crown at each joint. In this case, the faces of each block are cut at a 22½-degree angle so that it sits flat against the moldings' sloped backs. To pull each side of the joint together, offset two screws and drive them through the block perpendicular to each other.
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    Tools List

    • 30-foot tape measure
      Tape measure
    • hand clamps
    • miter saw
      Miter saw
    • drill
    • pencil compass
      Compass (optional)
    • jigsaw
      Jigsaw (optional)
    • pneumatic pin gun
      Pneumatic pin nailer (optional)

    Shopping List

    1x4 poplar boards
    Crown molding
    Filler strips (optional)
    1¾-inch drywall screws for building the frame
    1¼ and 2½-inch washer-head screws for attaching the crown
    Pin nails
    Wood glue
    Caulk (optional)