Making Cornice Board Valance. This is great info using the foam board. The best i can usually come up with is a yard sale treasure , which means it’s not perfect but it will do.
Cut your fabric and batting. I am so unknowledgeable about window treatments and fabric. If you have ever felt confused about window treatment terminology, you are not alone!
Wrap and staple tightly on the inside of the cornice.
Window valance boxes are pretty easy to diy. Both the fabric and batting will wrap around the cornice, so you'll want to make it proportionately bigger, for example six inches wider and 12 inches longer than the cornice board. They can easily enhance the look of your existing curtains or a bare. Making drapery cornices out of foam board.