Somebody looks up while getting something off a shelf and notices that the long steel spring above the garage door has gone orange between the coils. It has probably been like that for a while. The door still works, so it goes on the list of things that are presumably fine.
It is one of the few pieces of visible corrosion on a house that is genuinely load-bearing, and the way it fails is worth understanding.
What the spring is holding
The torsion spring above your opening is wound to store almost exactly the weight of the door. That is why a 200-pound door can be lifted by hand when it is set up correctly. The opener is not doing that work, and it is not built to.
The energy stored is substantial, which is why spring work is the one part of a garage door that a homeowner genuinely should not attempt. It is also why the spring is the part that wears out: it is the only component doing real mechanical work on every cycle.
Cycles, not years
Springs are rated in cycles. One cycle is one open and one close. A common residential spring is rated around 10,000 cycles.
That is not a duration. A household that opens the door six times a day gets through 10,000 cycles in about four and a half years. A household that opens it twice a day gets thirteen years from the identical part. Higher-cycle springs exist, they cost more, and on a busy household they are the one upgrade that is straightforwardly worth it.
So the useful question about a spring is never how old it is. It is how much of its life this house has used.
What rust actually does to that number
Three separate mechanisms, and they compound.
It reduces the wire diameter. A spring’s capacity depends very strongly on the thickness of its wire. The relationship is steep: small reductions in diameter produce disproportionately large reductions in what the spring can carry and how long it lasts. Rust converts steel into flakes and removes section, so a corroded spring is functionally a thinner spring than the one that was specified.
It creates stress raisers. This is the bigger effect. Fatigue failures do not start in the middle of good metal, they start at a defect. A pit from corrosion is a sharp-bottomed notch in a part that flexes thousands of times, and it concentrates stress at its tip. Springs with pitting fail well before their rated cycle count and they fail without any warning at all.
It causes coil binding. Rust between adjacent coils makes them rub and catch instead of moving cleanly against each other, adding wear and noise.
Why South Florida is hard on them specifically
It is not rain. It is the number of wetting cycles.
Humidity here means that on most nights any surface that cools below the dew point grows a film of condensation, and a steel spring in an unconditioned garage does exactly that. So the spring is wet nearly every night and dry by mid-morning, all year. Inland and further north a spring gets a fraction of those cycles.
Near the coast, add chloride. Salt makes that condensation conductive, which accelerates the electrochemistry, and chloride gets under coatings at any defect and works sideways beneath paint that still looks sound.
The coating is the specification that matters here
Springs come with different finishes and it is worth knowing which you are buying.
- Black oxide or painted. The default. Cheap and adequate in a dry climate. Not much of a barrier in this one.
- Galvanised. A zinc coating that corrodes sacrificially in place of the steel. A real improvement in coastal air, and worth specifying here even though it is slightly more.
- Oil-tempered with a coating applied after winding. Winding a coated spring damages the coating at every coil. A finish applied afterwards has no such defects.
In this part of the country the coating is not a detail, it is most of the service life, and it rarely appears on a quote unless you ask.
How to look at yours
Stand inside with the door closed and look along the spring or springs above the opening.
Uniform darkening is normal and is usually the finish. Orange flaking, particularly between the coils, is corrosion that has gone past the coating. Visible pitting when you look closely is the finding that matters.
Look also for a gap. A broken torsion spring shows as a clean separation of a few inches, and it is unmistakable once you know to look for it. And check the ends where the spring meets the cone and the centre bearing, which is where water tends to sit.
Look. Do not touch, do not attempt to lubricate a spring you cannot safely reach, and do not under any circumstances put a tool near the winding cones.
The money question
No prices. What sets the number is how many springs the door has, the wire specification for its weight, the cycle rating you choose, and the coating.
The lever that most affects long-term cost is the cycle rating, and it is the least exciting item on the invoice. On a household using the garage as its main entrance, a higher-cycle spring with a coating suited to the climate is not an upsell, it is the correct part for the duty.
What not to buy
- Do not buy one spring on a two-spring door. They are the same age, the same cycle count and the same weather. The second one follows within months, and you pay for the visit twice.
- Do not buy a spring for a corroded shaft. If the shaft and the end bearings are rusted, replacing the spring alone leaves the new part running in the thing that killed the old one.
- Do not buy a heavier spring than the door needs. An over-sprung door creeps upward on its own and fights the opener’s safety reversal. The right spring is the one matched to the weight.
- Do not buy paint for a rusty spring. Coating over pitting hides the defect and does nothing about the notch that will start the crack.
The short version
Springs are rated in cycles, corrosion cuts that rating, and South Florida gives a spring a wetting cycle most nights of the year. The coating you specify is most of how long it lasts.
The honest version of this is that a spring and an hour is a fairly ordinary repair, which is terrible news for anyone hoping to sell a door off the back of it. We would still rather you looked up and noticed the orange.
M&M Garage Door Service · (954) 787-3756 · mnmgaragedoorrepair.com
Serving Plantation, Fort Lauderdale and Broward County.