Every sectional garage door uses one of two spring systems, and which one you have changes the cost, the lifespan and the risk profile of every repair you will ever have done on it.
Torsion springs: above the opening
A torsion system is one or two springs mounted on a steel shaft directly above the door. They wind and unwind as the door travels, and cables on drums at each end do the lifting. Almost every door built in the last twenty years uses this arrangement.
Extension springs: along the tracks
An extension system uses long springs running parallel to the horizontal tracks, stretching as the door closes. They are cheaper to manufacture, which is why they persist on older and lighter doors.
| Torsion | Extension | |
|---|---|---|
| Location | Shaft above the door | Alongside the tracks |
| Typical life | Higher — even, wound load | Lower — stretched steel fatigues faster |
| Door balance | Better, smoother travel | More prone to lifting unevenly |
| If it fails | Recoils on the shaft, contained | Can whip if no safety cable is fitted |
| Parts cost | Higher | Lower |
The safety cable question
If you have extension springs, look for a steel cable threaded through the middle of each spring and anchored at both ends. That is a containment cable, and it is what stops a snapped spring becoming a projectile. If it is missing, have one fitted. It is inexpensive and it is the single most important safety item on that style of door.
If your door has extension springs and no safety cables, that is the first thing we would change — before anything cosmetic.
BH Garage Door USA technicians
Is converting worth it?
Converting extension to torsion is possible on most doors and usually worth doing if you are already paying for spring work. You get a quieter, better-balanced, longer-lived system. The constraint is headroom above the opening — low-headroom garages need a specific kit, so it is measured before anything is quoted.
Why the springs matter more than anything else
The Garage Door Springs carry the weight of the door. Every single time it moves.
It sounds obvious. It is not. The Garage Door Opener does not lift anything. It guides a door the springs have already balanced. That one distinction explains most of what goes wrong on a garage door.
When springs weaken, the motor starts doing work it was never built for. It runs hot, the drive gear wears, and eventually it gives up entirely.
People then buy a new Garage Door Opener and wonder why that one dies too. It is a small thing that turns into a big thing.
How to tell how much life yours have left
Springs are rated in cycles, not years. One cycle is one open and one close.
So what does that mean day to day? A builder-grade spring is often rated around ten thousand cycles. That sounds enormous until you count your actual use: two cars, a school run, someone working from home, a bin trip. Six to eight cycles a day is completely normal.
At that rate, ten thousand cycles is three or four years. Not the twenty people assume.
If you know roughly when the door was fitted and roughly how often it runs, you can estimate where you are on that clock without anyone looking at it. Nobody enjoys hearing it, but it saves money.
What we check on a spring call
Every visit runs the same way, whatever the original complaint was. It is quicker than it sounds, and it stops us treating a symptom and calling it a fix.
- Coil condition along the full length of both springs — gaps, surface rust, fatigue.
- The cycle rating originally fitted, so we can tell you honestly how much life you got.
- Cable condition at the drums, because cables and springs wear on the same clock.
- Drum set screws and shaft bearings, which is where an uneven door usually begins.
- The balance itself, by hand, opener disconnected. That is the proof the job is right.
If something on that list is worn but not urgent, we say so and give you a rough idea how long it has left. That way you can plan instead of react. Most people find this out the expensive way.
The mistake we see most
Replacing one spring and leaving the other in place.
That is the theory. Here is the reality. Both were wound on the same day and have done the same number of cycles. Change one and you have a brand new spring working alongside a tired one.
The balance is off from day one, and the second one goes within months.
It costs a little more to do the pair once. It costs a great deal more to do it twice. Most people find this out the expensive way.
The short version
If you take one thing away from all of that: a door that is balanced, lubricated and has working safety reverses will outlast one that is not. By years, not months.
Almost everything we get called out to was preventable. Most of it was cheap to prevent, too.
So if any of this sounds like your door, get eyes on it while it is still an inconvenience rather than a breakdown. We would rather do the small job.
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