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Cherry          Raminwood Information Tip Considering custom window treatments, horizontal blinds or other window coverings? See our measuring instructions so that your custom made window treatments fit your window. Remember to measure each and every window and check your measurements.

Build a Window Cornice

Give your window a whole new outlook. Whether you have or are planning to install formal drapery, miniblinds, Roman shades, or another casual window treatment, window cornices add a new dimension to your decorating efforts. In addition to a cornice's obvious functional purpose -- concealing drapery hardware or the often-unattractive tops of miniblinds and other window treatments -- a covering of fabric allows you to bring a touch of color and texture to your room. Choose a fabric that coordinates with (not necessarily matches) that of other furnishings or window treatments. (A separate project tells you how to cover your cornice with fabric.) A cornice can also be used to improve the proportions of a room that has undersized windows or window moldings. The dimensions of the cornice we show here can be easily modified to suit your design needs. You might, for example, decide to extend a cornice all the way to the ceiling instead of just a couple inches above the window casing. Materials List Tape measure 2-1/4-in. coarse-thread drywall screws 1/4-in. lauan plywood o Drill/driver w/ Phillips bit (or drill and screwdriver) Handsaw and combination square #6 Combination countersink-pilot bit o Utility knife and straightedge (opt.) Clamps (open to "D" dimension minimum) Wood glue o Two 2-in. inside corner braces 5/8-in. brads (or 5/8-in. screws) 1- and 2-in. screws for braces 1. Determine Cornice Dimensions: The cornice height should equal the width of one side of the window casing plus about 6 inches. The bottom edge should align approximately with the top of the window glass; the top will extend 2-1/4 inches above the top of the casing. The cornice depth should equal the thickness of the casing plus 2-4 inches (minimum). If there are existing or planned window treatments, the depth should equal the depth of any open window treatments plus 1 inch (minimum). The cornice width should equal the full window casing width plus 1 inch (minimum). This will allow a 1/2-in. overhang on each side. If existing or planned window treatments extend beyond casing, the cornice width should be the width of the treatment plus 1 inch. 2. Cut the Parts: Cut all parts, substituting your cornice height (H), depth (D), and width (W) for the letters in the cutting list. Use a square such as a combination or carpenter's square to mark square cut lines. Tip: Lauan plywood is inexpensive and can be cut with a handsaw, any power saw, or even a utility knife guided by a metal straightedge. You may also be able to have your lumber supplier cuts strips to your height (H) dimension (for the fronts and sides) and depth (minus 1/4" for the dust cover). Then all you need to do is cross-cut the lengths. 3. Attach Cleats to Sides and Front: Apply wood glue to the face of the cleat and locate it 1/2 inch below the top edge of the plywood. Drive 5/8-in. brads through the plywood into the cleats (or use 5/8-in. screws). Do the sides first; when doing the front, center the cleat set back 1-inch from the ends of the front. Space fasteners about 4-6 inches apart. 4. Assemble Cornice: Apply glue to the edges of the sides that mate with the front. Clamp the front to each side (or have a helper hold the pieces together). Drive 2-1/4-in. drywall screws through the sides and into the ends of the front cleat, and also through the front into the end of each side cleat. Offset the screw locations and bore pilot holes for the screws with a combination countersink bit. 5. Attach the Dust Cover: With the cornice upside down, apply glue to the three cleats and lay the dust cover in place. Bore pilot holes and use 1-in. coarse-threaded drywall screws to attach the cover to the cleats. With the dust cover on, drive brads through the face of the cornice into the edges of the plywood sides. 6. Mount the Cornice on the Wall: Use 1-in. screws to attach the inside corner braces to cleats so they are flush with the back end of the cleat. Place the cornice against the wall, centered over the window and with the dust cover on the top of the casing. Trace the brace mounting hole locations on the wall. Lower the cornice to cover it with fabric, and remove the braces and attach them to the wall with 2-in. screws. Reposition the fabric-covered cornice and reattach the braces to the cornice. Tip: To center the cornice over the window: Mark the top back edge of the dust cover at the center, and mark the center of the top casing on the wall about 1/2 inch above the casing. Align your two marks as you position the cornice. Cutting List Part Quantity Dimension side 2 1/4" x H x (D minus 1/4") front 1 1/4" x H x D side cleat 2 3/4" x 1-1/2" x (D minus 1/4") front cleat 1 3/4" x 1-1/2" x (W minus 2") dust cover 1 1/4" x (D minus 1/4") x (W minus 1/2")

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