If you are installing dual rods in the closet, the hanging measurements and spacing changes. 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. In these cases, the upper rod is usually installed at a height of 80 inches while the lower rod is positioned at 40 inches. 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. Another factor that will shift this height is if you choose to use a double-rod system in your closet.