Extension Spring Replacement in Sherborn, MA
Extension springs run above the horizontal tracks on either side of the door and stretch — rather than twist — to store lifting energy. They’re common on older garage doors and lighter-duty installations.
Local context for Sherborn
Winters around Sherborn bring real cold-weather stress on garage door springs and cables, a pattern seen consistently across colder parts of the country.
Extension spring systems use a spring mounted above each horizontal track that stretches as the door closes and contracts to help lift the door as it opens, working through a pulley-and-cable system that redirects the force downward to the door itself. This design was the standard for decades before torsion systems became more common, and it’s still found on many older homes and some lighter residential doors today.
Because an extension spring stores energy by stretching rather than twisting on a fixed shaft, a snapped extension spring can become a projectile if it isn’t restrained — which is exactly why safety cables (a thin cable that runs through the center of the spring, anchored at both ends) are considered essential on any extension-spring door. A door with extension springs but no visible safety cables is a real hazard and worth flagging to a technician even before a spring actually fails.
Extension Spring Replacement problems we see in Sherborn
Cable and hinge cold-brittleness
Along with springs, lift cables can also become more brittle in extreme cold, increasing the chance of sudden failure alongside a spring.
Frozen door-bottom seal adding spring load
In freezing conditions, a bottom seal frozen to the driveway can force the spring to work against extra resistance when the door opens, a common cold-climate stress factor.
Door drops suddenly or closes too fast
A snapped or badly weakened extension spring can no longer control the door’s descent, causing it to fall faster than normal.
Uneven lift, heavier on one side
When only one of two extension springs fails or weakens, the door often lifts unevenly or binds against the track on that side.
Frequently asked questions
How quickly can a broken garage door spring be fixed?
Broken spring repair is one of the most common same-day emergency requests, since a broken spring can leave a door unusable or unsafe to operate manually.
What is a safety cable and why does my extension spring need one?
A safety cable runs through the center of an extension spring and anchors at both ends, so that if the spring snaps under tension, the cable keeps the broken pieces from flying loose. Any extension-spring door without visible safety cables should have them added regardless of whether the spring has failed.
Are extension springs less safe than torsion springs?
Extension springs aren’t inherently unsafe, but they do carry a specific risk if safety cables are missing: a snapped extension spring under tension can become a projectile. With properly installed safety cables, extension systems are a well-established, functional design that’s simply less common on newer doors than torsion systems.