- 1). To determine the size of the cornice, measure the depth and width of the curtain top and rod that you want to cover. Measure the distance from the wall and add 1 inch. Use a miter saw to cut 45-degree bevels on each end of the front board, but cut only one end of the end boards. Reset the miter saw to 90 degrees and cut the other end of the end boards to the correct length.
- 2). Join the boards by applying woodworking glue on the mitered end and join each miter side with three 1-inch brads. Use an air powered brad nailer to nail the brads. A nailer is inexpensive to buy or you can rent one. Cut the top to fit the front and sides of the cornice. Apply glue on the box and place the board on top. Nail the top on with 1 1/2-inch brads that are spaced 6-inches apart.
- 3). Cut the two end pieces of the crown molding first. Cut them 1-inch longer than needed and miter one end of each piece at a 45-degree angle. Turn the box upside down, smear the end molding with woodworking glue and attach to the cornice with two 1-inch brads.
- 4). Measure and cut the front crown molding; glue and attach the molding across the front with 1 1/2- inch brads spaced 6-inches apart. Cut and attach the bottom trim the same way you attached the crown molding.
- 5). Fill any nail holes with compound and sand rough spots with 160-grit sandpaper. Apply a wood primer to the cornice with a 2-inch paintbrush. Paint the cornice the color of choice to match the decor and window treatment.
- 6). Measure the distance between the curtain brackets and cut a 1-by-2 inch board to fit. Screw the 1-by-2 inch board to the wall frame between the brackets using 2 1/2 -inch screws. Pre-drill holes 1/8 inch deep into the cornice and hold the cornice to the wall while putting in 2-inch screws.
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