The torsion spring system is a newer system. The spring bars are mounted on the inside header and torsion springs are mounted to each tube with a center bracket holding the spring in place. On each side of the garage door, each bar has a drum, which is attached to a cable, which winds around the drum to open or close the door. The cable and drum lift the door, while the torsion spring provides the force.
Torsion Springs’ Life Expectancy
Torsion springs are used both to raise the garage door as well as to hold it in place. When damaged, they need to be replaced by a professional. They usually have 5,000-20,000 cycles, which means they can last between 7 and 12 years.