Creating a fabric covered cornice is one of the most rewarding DIY projects for anyone looking to elevate the finish of a room. This horizontal frame mounted above a window instantly polishes the architecture, hiding curtain hardware and adding a layer of design sophistication. Unlike soft treatments, a cornice is rigid and tailored, offering a clean line that bridges the gap between the wall and the curtain rod.
The process requires a mix of carpentry precision and upholstery flair, but the barrier to entry is lower than you might think. With a few pieces of dimensional lumber and a staple gun, you can construct a solid shell that will last for decades. The real magic happens when you wrap that shell in fabric, transforming a plain box into a bespoke design element that ties your entire color palette together.
Understanding the Cornice Board
Before cutting a single piece of fabric, it is essential to understand the structure you are building. A cornice is essentially a shallow, wooden box that is mounted above the window frame. Its primary function is to provide a structured backing for the fabric, while its depth creates the illusion of height and blocks light from creeping between the curtain and the window.
Typically, the board is made from MDF (Medium-Density Fiberboard) or plywood, which offers a smooth, stable surface for finishing. However, for a more rustic or traditional look, solid wood boards with visible grain are also popular. The depth of the board usually ranges from 4 to 8 inches, depending on the amount of fullness in the fabric and the hardware you intend to conceal.
Required Materials and Tools
Success in this project is largely dependent on having the right materials and tools on hand. You will need dimensional lumber for the frame, which is usually 1x3 or 1x4 boards. Additionally, you will require MDF or plywood for the center, wood glue, finish nails or screws, and of course, the star of the show: your chosen fabric.
| Material | Purpose |
|---|---|
| 1x3 or 1x4 Lumber | Constructing the perimeter frame. |
| MDF or Plywood | Creating the solid center panel. |
| Fabric | Providing the aesthetic finish and color. |
| Batting (Optional) | Adding subtle texture and insulation. |
Measuring and Cutting the Frame
Accuracy is the backbone of a professional-looking cornice. You must measure the width of the existing window frame, including any trim or casing where the cornice will sit. Transfer this exact measurement to your MDF board, which will become the front panel of your box.
Next, cut your lumber to create the sides. The height of these pieces will determine the depth of the cornice. To assemble the frame, attach the sides to the ends of a shorter top piece using wood glue and nails. Finally, secure the MDF front to this box using a brad nailer. If you prefer a seamless look, you can miter the corners of the lumber for a picture-frame appearance.
Fabric Selection and Preparation
Choosing the right fabric is crucial because it dictates the mood of the room. Heavy fabrics like velvet or chenille provide drama and light blocking, while linen or cotton blends offer a relaxed, airy feel. For a tailored look, medium-weight fabrics with a bit of body work best, as they hold structure without sagging.
Before you begin the upholstering process, wash and dry your fabric if it is prone to shrinking. If you opt to use batting, cut a piece slightly smaller than the MDF board. Lay the batting down first, then place the fabric face down on top of it. This ensures that the batting adds dimension without creating bulk under the fabric.
Upholstering the Board
With the board prepared, it is time to wrap it in fabric. Start by placing the center of the fabric face down on a flat surface. Lay the cornice board face down on top of the fabric. Pull one side of the fabric up and staple it securely to the back of the board, ensuring the fabric is taut and centered.
Move to the opposite side, pulling the fabric tight and stapling it in place. The key is to maintain even tension so the fabric lies flat. Next, fold the corners in neatly, creating clean miters, and staple them down. Finally, attach the top and bottom edges, working your way outward to eliminate wrinkles and creases.
Installation and Finishing Touches
Once the fabric is perfected, you need to prepare the cornice for hanging. Attach sturdy brackets or cleats to the back of the board, ensuring they are level. Carefully lift the cornice into position above the window and secure it directly into the wall studs. This step requires a helper to ensure the board aligns perfectly with the window frame.
After installation, you might choose to add a stiff interfacing or a lining fabric to the back for a cleaner finish. You can also paint or stain the exposed wooden edges for a more polished look. Whether you leave it natural or add a trim, the result will be a custom window treatment that looks like it came from a high-end designer, but was made with your own hands.
