Jan 13, 2009 4:46 PM by Overhead Door Company
Springs counterbalance the weight of a door and actually lift the door. Extension springs run parallel to the track to help the door raise and lower. When the door is down, the springs extend. When the door is up they contract. Over time these springs stretch out offering the opener less help with opening the door. Extension springs work independently of each other and wobble back and forth causing more uneven wear on your door parts. Torsion springs are located above the door opening and generally work together as a pair providing smooth and even operation. They are the superior spring as they are more precisely gauged for the size and weight of your door. Torsion springs offer more control over the door when raising and lowering and are safer than extension springs when they break as they are "contained" on the torsion bar.
10 hours ago