Every overhead garage door relies on springs to do the heavy lifting. The opener (or your arms) only guides the door; the springs counterbalance most of its weight so it moves smoothly and stays where you leave it. Most homes use one of two systems: torsion springs or extension springs. Knowing which one you have and what failure looks like helps you spot trouble early.
Why Garage Door Springs Matter
A garage door is heavy, and its springs are wound or stretched to store enough energy to offset that weight. When the springs are balanced correctly, a closed door should lift with modest effort once it is disconnected from the opener, and a partly open door should not drift much on its own. When a spring weakens or breaks, the opener ends up straining against the full weight of the door, and the door can become hard to control.
That stored energy is also why springs are the most dangerous part of the system. A spring under tension can release suddenly and with real force, so any adjustment, removal, or replacement is a job for a trained professional.
How Torsion Springs Work
Torsion springs are mounted on a metal shaft that runs horizontally across the top of the door opening, usually just above the header. When the door closes, the springs twist and store energy. When the door opens, the springs unwind, turning the shaft. Cable drums at each end of the shaft wind up lift cables attached to the bottom corners of the door, raising it evenly from both sides.
A door may have a single torsion spring or a pair, depending mainly on its size and weight. Springs are typically anchored to a bracket near the center of the shaft, with bearing plates at the ends to let the shaft turn freely.
Pros of torsion springs
- Smoother, more controlled lifting because the force is applied evenly through the shaft and drums.
- The spring stays on its shaft if it breaks, so it is less likely to fly loose.
- Generally better suited to heavier doors, such as insulated, wood, or wide double doors.
- Many are designed for a longer service life than basic extension springs.
Cons of torsion springs
- Usually cost more to purchase and install than extension springs.
- Winding and unwinding them requires special tools and training.
- Need some headroom above the door for the shaft and hardware.
How Extension Springs Work
Extension springs run parallel to the horizontal tracks, one on each side of the door, mounted above the tracks between the back hangers and pulleys near the door. As the door closes, the springs stretch and store energy. As it opens, they contract and, through a system of pulleys and cables, help lift the door.
Pros of extension springs
- Often less expensive up front.
- Common on lighter, single-car doors and older installations.
- Can work where there is limited space above the door opening.
Cons of extension springs
- Because each side works independently, uneven wear can cause the door to lift unevenly.
- They are fully stretched whenever the door is closed, so a break can release energy along the track.
- Pulleys and cables add more parts that can wear out.
- Without safety cables, a broken spring or cable can whip around the garage.
Why Safety Cables Matter on Extension Springs
A safety cable (sometimes called a containment cable) runs through the center of each extension spring and is anchored at both ends. If the spring snaps, the cable keeps the broken pieces contained instead of letting them fly across the garage toward people, cars, or windows. If you have extension springs and do not see a cable running through the middle of each one, ask a technician to look at it. Do not try to add one yourself while the springs are under tension.
How to Tell Which Springs You Have
With the door closed, look at the area above the door and along the tracks without touching any hardware:
- Torsion: one or two large coils on a horizontal bar directly above the door, with round cable drums at each end of the bar.
- Extension: long springs running front to back above each horizontal track, usually connected to pulleys and cables.
Most homes in Southlake and nearby cities like Keller and Grapevine have one of these two setups.
Signs a Spring Is Worn or Broken
Springs are rated by cycles, with one cycle meaning one full open-and-close. Every cycle wears the steel a little, so springs eventually fatigue and break. Watch for these signs:
- A loud bang from the garage when no one was using the door. This is often the sound of a torsion spring releasing its tension at once.
- A visible gap in a torsion spring coil, or a stretched, sagging, or separated extension spring.
- The door opens only a few inches and stops, or the opener strains and reverses.
- The door feels much heavier than usual, or it slams down quickly when closing.
- The door rises unevenly or looks crooked in the opening.
- Jerky, noisy movement, which can also point to worn rollers, bearings, or cables.
- Loose or frayed lift cables.
Springs do not work alone. Worn rollers, stiff bearings, and dry hardware make the springs work harder and can shorten their life. A periodic garage door tune-up helps catch these issues, and our guide to signs your garage door needs maintenance covers other warning signs. Frayed or slipping lift cables should be handled through broken cable replacement, since cables and springs are under the same load.
What to Do If You Suspect a Broken Spring
- Stop using the door and the opener.
- Do not pull the emergency release while the door is open. Without spring support, the door can drop suddenly.
- Keep people, pets, and vehicles clear of the door.
- Do not try to adjust, unwind, or remove any spring, cable, drum, or bracket.
- Call a garage door professional to inspect the system.
If your door has two torsion springs and one breaks, technicians commonly recommend replacing both. They have been through the same number of cycles, so the remaining spring is often close to failing too, and matched springs keep the door balanced.
Why Spring Work Should Be Left to a Pro
Garage door springs hold enough energy to cause serious injury. Winding bars can slip, set screws can let go, and extension springs and cables can snap with force. Spring size, wire thickness, and length also need to match the specific door, or it will not balance correctly. For these reasons, we do not provide do-it-yourself instructions for spring adjustment or replacement, and we strongly recommend against attempting it.
Converting From Extension to Torsion Springs
Many homeowners with extension springs ask about switching to torsion springs. In many garages it is possible. A conversion generally involves removing the extension springs, pulleys, and related hardware, then installing a torsion shaft, springs, drums, bearing plates, and new cables sized for the door. Whether it makes sense depends on the door’s weight, the available headroom, the condition of the header, and the condition of the rest of the door. A technician can look at your setup and tell you whether a conversion is practical.
Frequently Asked Questions
Are torsion springs better than extension springs?
For many doors, torsion springs offer smoother operation and better containment if they break. Extension springs can still work well on lighter doors when they are in good condition and have safety cables installed.
How long do garage door springs last?
It depends on the spring’s cycle rating, how often the door is used, and how well the rest of the door is maintained. A door that is opened and closed many times a day will wear its springs out sooner than one used occasionally.
Can I replace just one spring?
On a two-spring door, replacing both at once is usually the better choice, because the older spring has the same wear and is likely to fail soon.
Get Help With Garage Door Springs
If you hear a bang from the garage or your door suddenly feels heavy, First Responder Garage Doors can inspect your springs and recommend broken garage door spring repair or broken garage door spring replacement for homes in Southlake, Colleyville, and nearby communities. Call (817) 991-5551 to schedule a visit.