Why garage door springs break
Springs fail from fatigue, not from abuse. Every open-and-close is one cycle, and a standard spring is rated at roughly 10,000 of them. A household opening the door four times a day reaches that in about seven years; one opening it ten times a day gets there in under three.
Three things accelerate it. Rust, which pits the steel and creates a stress point — the reason a light oiling once a year genuinely extends spring life. Incorrect sizing, where a spring that was never right for the door weight has been fighting from day one. And imbalance, where a worn partner spring, dragging rollers or a bent track make the surviving spring work harder than it was rated to.
Torsion springs versus extension springs
Torsion springs are the modern standard on sectional doors: mounted centrally, wound under controlled tension, and safer in failure because the spring stays captive on its shaft.
Extension springs stretch along the horizontal tracks and are still found on tip-up doors and older installations. They do the same job less elegantly, and when one breaks it can travel — which is why safety containment cables through the centre of an extension spring are not a nice-to-have.
Both types are fitted and replaced. What we will not do is fit a torsion conversion to a door that does not have the headroom for it, or leave an extension spring without its containment cable.
How a torsion spring actually works
A torsion spring sits on a steel shaft above the door opening. As the door closes, the cables wind onto drums at each end of that shaft and twist the spring, storing energy. When you open the door, the spring unwinds and returns that energy, lifting the weight for you.
Balance is the whole point. On a correctly sprung door you can stop it at waist height with the motor disconnected and it will simply stay there — neither falling nor rising. That single test tells a technician more about a door's condition than any electronic diagnostic.