How To Make A Valance Board. 12″ was allowed for the center pleat. 13 board mounted valance ideas (with pictures) board mounts are the best way to ensure that a window treatment hangs properly.
Box pleat valances are usually mounted to a board, but you can make a box pleat valance on a rod, too and it’s super easy. Cornice boards are cheap to make.
15 DIY Window Treatments Valance Patterns Window
Cut poster board into one 48” x 10” piece and two 8” x 10” pieces. Decide how long you want it and how wide.