Step 1: Cut the pieces

cutting the pieces
Photo: Wendell T. Weber
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To size the plywood mounting board, add the casing widths to your mirror’s dimensions and subtract 1 inch from each side. The casings, resting flush on hardboard spacers, will overlap the mirror on their inside edges. Use a circular saw to cut the plywood and hardboard. Position the mirror and spacers on the plywood so that the spacers are flush with the plywood’s perimeter.
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    Tools List

    • circular saw
      Circular saw
    • hammer
      Hammer
    • hand clamps
      Clamps

    Shopping List

    ½-inch plywood Get a full sheet

    ¼-inch hardboard Get a 4x4 sheet

    3-by-4 foot mirror

    3-inch fluted door casing Get two 8-foot pieces.3½-inch corner block Get four.

    3d finishing nails

    Wood glue

    Mirror adhesive caulk