Continue to allow about 24 inches of space from the rod to the back of the wall, but increase the height of the top rod. Make this a full 80 1/4 inches above the ground, which is high enough to hang two levels of clothing with 40 inches in between. If installing a double-rod closet system, mount the top rod 81-¾ inches above the floor and the lower rod 40-½ inches above the floor. In these cases, the upper rod is usually installed at a height of 80 inches while the lower rod is positioned at 40 inches. Another factor that will shift this height is if you choose to use a double-rod system in your closet. If you are installing dual rods in the closet, the hanging measurements and spacing changes.