Why Garage Door Springs Break on Cold Michigan Mornings

What the spring is actually doing

A sectional garage door is heavy. A double insulated steel door commonly weighs between 150 and 250 pounds, and the opener is not built to lift that. The torsion spring above the opening is. It is wound under tension, and as the door comes down the spring winds tighter and stores that energy. As the door goes up it unwinds and gives the energy back, so the door is close to weightless through most of its travel and the opener only has to overcome friction and start the motion.

That is why a correctly balanced door will hold its position when you lift it halfway by hand with the opener disconnected. The spring is carrying the door, not the motor.

Why springs are rated in cycles, not years

Every open and close is one cycle. A standard residential spring is commonly rated around 10,000 cycles. A household that leaves twice a day and comes back twice a day runs roughly 1,460 cycles a year, so a spring at that rate reaches its rating in about seven years. A busy family with teenage drivers can double that and reach it in three or four.

The rating is not a guarantee and it is not a cliff. It is the point at which the steel has accumulated enough fatigue that a break becomes likely rather than unlikely. Long before the wire parts, microscopic cracks have been forming at the inside of each coil where the stress concentrates.

What the cold adds

Two things change when the temperature drops.

Spring steel gets less forgiving

High-carbon spring steel becomes less ductile as it gets colder. Warm steel will stretch a little at a crack tip and blunt it. Cold steel is more inclined to let that crack run. The spring is not weaker in the sense of carrying less load, but it is less tolerant of the damage it already has.

Everything else gets stiffer at the same time

Grease in the rollers and hinges thickens, the weatherseal at the bottom of the door can freeze to the slab, and the sections themselves contract slightly. The door now needs more force to break away from the floor on that first lift of the morning, and the spring is what supplies it. A tired spring meets its highest demand of the year on the coldest morning of the year.

That is why these calls cluster in January and February across Livingston, Oakland, Wayne, Washtenaw and Genesee counties, and why they cluster in the first hour of the day.

How to tell a spring broke

• A single loud bang from the garage, often described as a gunshot, with nothing visibly wrong afterwards.
• A visible gap in the coil above the door. An intact torsion spring is a continuous helix; a broken one has a two to three inch separation.
• The opener strains, the motor runs, and the door lifts an inch or two and stops.
• The door is far too heavy to lift by hand once the opener is released.
• The top section flexes or the door goes up crooked, which means one side is still being carried and the other is not.

What to do, and what not to do

Leave the door in the position it is in. If it is closed, use another door. If it is open, do not stand or park under it.

Do not keep pressing the opener button. With no spring assist the opener is dragging the whole weight of the door on a chain or belt that was never sized for it, and the usual result is a second repair on top of the first: a stripped gear, a snapped chain or a bent top section.

Do not attempt the spring yourself. A torsion spring is wound to several hundred pounds of force and is unwound with bars sized to the shaft. It is the one part of a garage door that regularly injures people who take it on without the right tools.

Disconnect the opener with the release cord only if you have to get a car out and you have enough people to control the door safely. Remember that with the spring gone, the door will drop the moment it is not held.

Replacing one spring or both

On a two-spring door the pair went up together and has cycled together, so the one that did not break has the same age and the same fatigue history as the one that did. Replacing both keeps the door balanced and avoids a second visit within a season. On a single-spring door there is only one to change, and it is worth asking whether the door is a candidate for a higher-cycle spring.

What reduces the chance of the next one

• Keep the bottom seal free of ice so the door is not tearing itself off the slab each morning.
• Have the balance checked. A door that will not hold at the halfway point is working the spring harder than it should on every cycle.
• Keep the rollers and hinges lubricated with a garage door lubricant, not a general penetrating spray, which washes the grease out.
• If the door is the main entrance to the house and runs many cycles a day, ask about a higher-cycle spring at the next replacement.

Frequently asked questions

Can I still open the door after a spring breaks?

Not safely by hand. The spring carries almost all of the door's weight, so once it breaks the full weight sits on the opener and on you. Leave the door where it is and call for service.

Why did the spring break in the cold and not in summer?

Cold does not create the failure, it finishes one that was already in progress. A wire carrying years of fatigue is more likely to part on a freezing morning than on a mild one.

Should both springs be replaced when only one breaks?

On a two-spring door, yes in most cases. The surviving spring is the same age and has done the same work.

Is a broken spring an emergency?

Empire treats it as one, because the door is usually the main way in and out and a car can be trapped behind it. Calls are answered and dispatched around the clock, every day of the year.