Your garage door spring snapped: what happened and what to do

Broken spring

The sound that most people remember

Many homeowners describe the same moment. They are inside the house, maybe in the kitchen or a back bedroom, and there is a sharp crack or bang from the garage that sounds like something heavy was dropped. Some people assume a car backfired or a shelf collapsed. A few walk out to look and find nothing out of place, until the next time they try to open the door.

That bang is the sound of a spring releasing a large amount of stored energy at once. A garage door spring is wound tightly, and when the metal fatigues and fails, the coil snaps and the tension disappears all at once. The door itself usually has not moved, which is why the damage can go unnoticed for hours.

If you were not home when it happened, the clues come later. The opener strains and hums but the door barely lifts, or the door rises a few inches and drops back. Or you pull the manual release and find the door will not stay up by hand.

Whatever you notice first, treat that bang as a sign that the balance system has changed and the door should not be run until it has been inspected.

Why the door suddenly feels so heavy

A garage door can weigh well over a hundred pounds, and in many homes much more. You never feel that weight in normal use because the springs counterbalance it. A well balanced door feels light enough that, with the opener disconnected, it can be lifted by hand and will stay near the halfway point without drifting.

When a spring breaks, that counterbalance is gone. The door now weighs what it really weighs, and an opener motor sized for a balanced door has to lift all of it. That is why you may hear the motor hum and the chain or belt strain while the door stays put or barely moves.

Some homes have two torsion springs on one shaft, and if one breaks the other still carries part of the load. The door might move partway, feel lopsided or open a few inches and stop. That does not mean the system is fine. The remaining spring is under extra strain and is often close behind the first in age.

For a plain explanation of how the balance works, see how garage door springs work.

Signs you can check from a safe position

You can confirm a broken spring with your eyes and ears without touching anything. On a torsion system, look at the metal bar above the door opening. The springs sit on that bar like long coils. A broken one shows a visible gap in the coil, usually a space of an inch or more where the wire has separated, and the two halves may look different in length.

On an extension system, springs run along the sides of the door, parallel to the horizontal tracks. A broken extension spring may be hanging loose, stretched out of shape, or missing a piece. In some cases the broken end has flailed and marked the wall or ceiling.

You might also see pieces of metal on the garage floor, or a small bright mark on the shaft where the end of the wire struck. Do not pick anything up from near the springs, and do not reach in to move the pieces for a closer look.

Take photos from a safe distance and note which side is damaged. That information helps the technician bring the right parts and plan the work.

• A visible gap in a coil above the door opening.
• A sharp bang followed by a door that is hard to lift.
• The opener hums or strains but the door barely moves.
• The door rises a little and then drops back.
• A cable that has gone slack on one side.

Why the opener should not be used afterward

It can be tempting to press the wall button and see what happens. The opener is not made to lift a door that has lost its spring support, and it may try anyway. The motor will draw hard against a load it was never meant to carry, and parts inside the opener that carry the force, such as the drive gear or the trolley, can wear or break.

There is also a risk to the door. An unbalanced door that is dragged upward by the opener can bind in its tracks, bend a section, or put uneven pressure on the cables. If the cables go slack and then take up load again suddenly, they can jump a drum or fray.

If the door does rise partly and then drops, it can fall onto whatever is below it, including a vehicle. For that reason, do not leave a car, a bicycle, or a person in the path of a door that has a broken spring.

So set the wall button and remote aside, tell the household not to use them, and leave the opener alone until the spring has been dealt with. Our page on an opener that hums while the door does not move covers the sound you may be hearing.

The danger of handling springs yourself

A spring on a garage door holds enough stored force to cause serious harm. A torsion spring is wound with a precise number of turns, and the end fittings are held by set screws. Loosening one while the spring is under tension can send a winding bar spinning and cause injuries to hands, face and body.

Even a broken spring is not safe to casually touch. The unbroken half may still hold tension, and the cables and drums are still connected to a door that wants to move. That is why no step by step instructions for spring work belong in a homeowner guide.

Many accidents come from people who thought they could replace one part to save time. The parts are not interchangeable by guess, because the right spring depends on door weight, height and track setup. Using the wrong size leaves a door that is unbalanced and wears out the opener.

This is work for a trained technician with the proper winding tools and the knowledge to match the system. If you want to understand what the work involves, read spring repair, which describes the service from the customer side.

Keeping the garage secure while you wait

If the door is closed, leave it closed. A closed door with a broken spring is still held in place by its own weight and the track, and it is the safest position. Do not try to lift it, since it may fall back with little warning, and a dropped door can crush a hand or foot.

If the door is stuck open, there is a security concern. You cannot close it, and a heavy door that you cannot raise or lower is difficult to secure. Park vehicles away from the opening if possible, close and lock the door between the garage and the house, and store tools and valuables elsewhere.

If someone in the household uses the garage as the main entrance, plan for another way in. Remember that in Houston the weather can make a stuck door a bigger inconvenience. Heavy rain or wind can push water into an open garage, so protect anything that could be damaged.

Do not prop a door open with a chair, ladder or stack of boxes. A prop can fail without warning, and the door can come down on it. If the door has to be held, the technician will handle that with proper support.

What to tell the technician on the phone

The call goes smoothly when you describe what you saw and heard. Start with the bang and when it happened. Then say what the door does now, such as barely lifting, dropping back, or staying down. Mention whether the door is open or closed.

If you can see the springs, say whether there are one or two, and whether there is a visible gap. If your garage has two doors, say which one is affected. It helps to know the approximate width and height of the door and whether it is insulated or heavy.

Also mention how old the system seems and whether there have been earlier signs of trouble, such as squeaking, a door that took a little more effort than before, or an opener that started to strain. Those details tell the technician about the wear on the whole system.

Remember that the process is simple. You call and describe the issue. The system is inspected on site. The options are discussed before any work begins, and the finished work and normal operation are reviewed with you.

Why a broken spring rarely stands alone

Springs wear in cycles. Each time the door goes up and down, the spring winds and unwinds, and over time the metal tires. When one spring in a pair goes, the other has done the same number of cycles and is usually close to failing. This is the reason for the question many people ask about changing one spring or both, covered in replacing a spring pair versus a single spring.

Cables are also involved. When a spring breaks, the sudden change can leave a cable slack or damaged. A technician should examine the cables, drums and bottom brackets while the door is supported. If you suspect a cable problem, see frayed or loose garage door lift cable.

Rollers, hinges and the center bearing can also be affected by the strain of lifting an unbalanced door. If anyone tried to force the door up by hand or with the opener, those parts deserve a look.

Checking the whole balance system rather than a single part is what makes the repair last. A door that is properly balanced puts less wear on the opener and every moving part.

Repair choices a technician will talk through

The first choice is usually whether to replace the broken spring only or the pair. The second is the type of spring. A standard spring is made for a typical number of cycles, while a longer life spring is made for a higher number. Which makes sense depends on how often your household uses the door. Our comparison of standard versus high cycle springs explains the difference.

Another question is whether your system is a torsion or an extension type, since each has its own parts and its own safety features. The differences are laid out in torsion versus extension springs.

You may also talk about whether other wear items should be dealt with at the same visit, such as cables, rollers or a worn bearing. These choices come down to the condition of the door and your plans for it. A good technician will explain what is necessary, what is optional, and why.

Ask for the options to be explained in plain words before any work begins. That is a normal part of a service visit, and our guide on questions to ask a garage door technician gives a short list to bring.

How a balanced door is confirmed afterward

After new springs are installed, the door should be tested for balance. With the opener disconnected, a well balanced door should lift smoothly and stay roughly where it is left near the middle of its travel. A door that slams down or shoots up is not balanced.

The technician also checks that the cables are seated properly on the drums, that the door rides evenly in the tracks, and that the opener has not been strained. Normal operation with the opener is then reviewed with you, including the safety reversal.

You can learn how balance is judged in how to test garage door balance, though the test should be treated as an observation, not a repair. If anything seems off, stop and call.

It also helps to ask the technician to show you where the springs sit, what the cables look like when they are properly seated, and what a normal sound is for your particular door. Knowing that baseline makes later changes easier to notice. Write down anything you are told about the condition of the other parts so you can compare it at the next visit.

Over the following weeks, listen to the door. A smooth, quiet motion is a good sign. A new shake, scrape or strain means it deserves another look.

Looking after the new springs

Springs live a hard life, but a few habits help. Keep the hardware lightly lubricated in the places the manufacturer recommends, and avoid spraying random products on the springs themselves unless a technician has told you it is appropriate. Our garage door lubrication guide explains the general approach.

Houston humidity can encourage surface rust on exposed steel, including springs, so a periodic look matters. Surface rust on its own may be minor, but heavy corrosion or a visible crack should be mentioned during your next service visit.

Pay attention to changes. A door that suddenly feels heavier, an opener that begins to strain, or a door that sits unevenly when partly open can point to weakening tension before a break.

Keeping a short note of when work was done, using something like a garage door service log, makes it easier to judge when the system is due for attention again.

Questions and answers