A cornice of the width of your bedroom is actually easier to build than a shorter ledge, as it is only two-sided. This style of cornice is designed to work with walls of windows or walls with full-width curtains. The cornice hides curtain rods and the top of the curtains. It is often cut with padding and upholstery same or tissue that blends well with the curtains.
Measure the length of the wall where you want to place the cornice. Subtracting 1/2 inch (1.27 cm). Cut two tables 1 by 6 inches (2.54 by 15.23 cm) of this measure using a table saw.
Place the end of a plate on the upper side of the second plate. Finishing nails placed through the side at the end of the table every 8 inch (20.32 cm). Place the cornice with a flat board on the floor when finished.
L stands placed every 3 to 4 feet (91 to 121 cm) along the inside corner of the ledge. Screw the brackets on both pieces of wood to create a secure.
Short batting 5 inches (12.7 cm) longer than wood and 18 inches (45.72 cm) longer. Keep the batter smooth and slightly stretched in the face outside of the tables. Trim excess fabric. Repeat with your decorative fabric.
Moves a stud finder along the wall 4-6 inches (10.16 to 15.23 cm) above the top of the window trim. Mark the location of each beam. Draw a line through your guideline marks at the desired height to the cornice. L bracket screwed into the wall stud in your line. Using two screws and a holder for every two or three beams.
Locate the ledge in the L brackets mounted on the wall and screw them above the bottom. Add L bracket at each end of the ledge to the adjacent side wall. Use wall anchors if you screw the brackets to the studs.