Why Extension Springs Need Safety Cables — And What We Found in Dunwoody
Of all the parts on a residential garage door, extension springs carry the most stored energy — and when one fails without a safety cable in place, the result can be serious injury or property damage. We were reminded of that on a recent service call in Dunwoody.
What Extension Springs Do
Extension springs are the long springs mounted along the horizontal tracks on either side of the garage door. They stretch as the door closes and contract as it opens, counterbalancing the weight of the door so the opener and your arms are not lifting the full load.
They are common on older homes and on lighter single-car doors. They work well — but they store an enormous amount of tension, and that tension has to go somewhere if the spring breaks.
What a Safety Cable Actually Does
A safety cable is a steel cable that runs through the center of each extension spring and anchors to the track bracket at both ends. Under normal operation it does nothing at all.
But when a spring snaps under tension, the broken halves release with tremendous force. Without a cable, those pieces can become projectiles — striking a vehicle, a wall, or a person standing in the garage. The safety cable contains the broken spring, letting it fail in place instead of flying across the room.
It is a simple, inexpensive part. It is also the single most important safety component on an extension spring system.
What We Found in Dunwoody
Our technician recently responded to a service call in the Dunwoody area where a homeowner noticed their garage door was operating unevenly.
On inspection, one of the extension springs had come loose from its anchor point. The spring was still under tension and hanging free — with no safety cable running through it. Had that spring released while someone was in the garage, there would have been nothing to contain it.
Thankfully, nobody was hurt. Our technician secured the system, replaced the failed hardware, and installed safety cables on both springs before leaving.
The homeowner had lived in the house for years and had no idea the cables were missing. That is the part worth paying attention to — most homeowners never look, because there is no reason to think about it until something goes wrong.
How to Check Your Own Door
Look at the springs running along the tracks above your garage door. If you have extension springs, you should see a thin steel cable threaded through the center of each one, anchored at both ends.
If you see the spring but no cable running through it, your system is missing a critical safety component and should be serviced.
A few other warning signs worth noting:
- A door that opens unevenly or appears to tilt
- A visible gap in a spring
- Springs that look stretched out or misshapen
- Loose hardware at the anchor points
Note for Torsion Spring Systems
If your springs are mounted on a bar above the door rather than along the side tracks, you have torsion springs. Those do not use safety cables — the shaft itself contains the spring if it breaks. Different system, different safety design, but the same annual inspection still applies.
Schedule a Free Inspection with Top Dog Garage Doors
Top Dog Garage Doors provides garage door inspections, spring replacement, and safety cable installation for homeowners throughout Atlanta including Dunwoody, Brookhaven, Buckhead, Sandy Springs, and Decatur. Our technicians are licensed, insured, and background-checked.
If you have extension springs and are not sure whether safety cables are installed, contact us for a free garage door inspection. It takes a few minutes to check, and it is one of the least expensive fixes in the trade.