Extension springs and torsion springs. An overhead garage door has two springs one on each side of the door see figure. All About Garage Door Springs Advantage Garage Doors Because of the pulley system the springs stretch only. An overhead garage door has two springs . A force of 15 pounds is required to stretch each spring 1 foot. The door moves a total of 8 feet. If you have an electric remote controlled garage door opener you have springs. The torsion spring directly above the closed door provides 100 of the lift needed to raise the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of the pulley system the springs stretch only one-half the distance the door travels. Lighter and smaller doors may only have a single torsion spring while larger and heavier doors may have two springs with one located on either side of the central plate. A force of 15 pounds is required to stretch each spring 1 foot. An overhead garage door has two spring...
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