Mark the location on the wall to attach the L-brackets. Use the length of your cornice as a guide. For heavier cornices, use two L-brackets vertically aligned, spaced 3 to 5 inches apart depending on the width of the cornice.
Drill the L-brackets to the wall. Drill a guide hole then attach the L-bracket to the wall with the drywall screws provided in the package. If no stud is available behind the wall, drill a guide hole and attach the L-bracket with drywall anchors followed by the drywall screws.
Hang the cornice. Aided by an assistant, hold the cornice up to the wall. The L-brackets should be on the inside of the cornice.
Attach the cornice to the L-brackets. While your assistant holds the cornice, use the remaining screws in the package to attach the cornice. Be sure the cornice is flush against the wall and is tightly fastened.