HOUSTON GUIDE

When a torsion spring snaps over a Houston door

A bang from the header, then the door will not rise, or it climbs an inch and quits. That is the usual sound of a torsion spring letting go. On a Houston bay the wire often rusts for years in humid air before it breaks. This page is about that spring, why the rust makes the repair a technician job, and what to leave untouched until someone with the right bars is standing on a clear floor.

By Mike Maziarz · Sources checked October 6, 2026 · How we write these guides

What the bang usually means

The noise comes from above the opening, not from the opener motor. A torsion spring is a coil of wire on a shaft over the door. It is wound so it can counter the weight of the panels. When the wire breaks, the stored twist releases at once. People describe a gunshot, a gap in the coil, and a door that suddenly feels like a solid wall. Look from the side, with the door down if it is down. You are checking for a visible gap in the coil, not climbing onto a ladder to poke the shaft.

A double door often carries two torsion springs on the same shaft. One can break and leave the other still wound. The door may hang crooked, or the remaining spring may be asked to do work it was not sized for. Do not decide that the unbroken coil is fine because the door still twitches. Both springs, the drums, and the cables need a look by someone who replaces this hardware for a living. A single-car door in a tight Garden Oaks garage can still hide a pair of springs, so count the coils before you describe the job.

Torsion springs are not a hardware-store coil

The wire size, the inside diameter, the length of the coil, and the hand of the wind all have to match the door. A spring that looks similar is not a match. Winding bars fit the cones on the shaft. Screwdrivers, pliers, and pieces of pipe do not. The cones, the set screws, and the center bracket take the load. If a set screw lets go, the shaft can spin. That is the injury people are trying to avoid when they say a homeowner should not wind a torsion spring.

Some older doors still use extension springs stretched along the horizontal tracks, sometimes with a safety cable through the coil. Those are a different part, and a break there is still not a casual swap if you cannot see how the cable is routed. Most of the doors this page is about are torsion. If you are unsure which you have, say so. A photo taken from the floor, door closed, is enough for a first conversation. Do not lean into the header to get a closer frame.

Rust is why this stays a technician job

Houston air stays humid, and a garage traps that moisture against bare steel. Spring wire, the shaft, and the winding cones pick up orange scale long before the door stops. A rusted spring can break while it is being wound or unwound, not only while the door is in daily use. Sanding the scale, painting over it, or spraying a light oil on a coil that is already cracked does not return the wire to a known strength. The safe assumption is that a rusty torsion spring is replaced, not tuned.

That is also why a neighbor's spare winding bars are not a favor you should accept. The person doing the work needs the right bars, a winding cone that still grips, and a floor clear of the car, the mower, and the bin that usually sits under the drum. Humid air does not pause for a careful amateur. If the coil is flaking, say that on the call. It tells the technician to bring a matched spring rather than a can of lubricant. Lubricant belongs on a sound spring during maintenance, not on a coil that has already opened a gap.

How the door behaves once the spring is gone

With the spring broken and the door down, leave it down. The opener may still try to lift, grunt, and stop. Do not hold the wall button through that strain. You can burn the motor or strip the drive trying to raise a door that no longer has a counterbalance. If the door was open when the spring failed, it may be stuck overhead. Do not walk under it. A partial spring can let the door creep, then drop. Keep people and pets out of the bay until the door is secured by a technician.

A door that will not close after the bang is a different sequence from a door that will not open, and the two get confused on the phone. If the panels start down and reverse, that may be a sensor or a force setting rather than the spring alone. The page on a door that will not close separates those clues. If you cannot tell whether the motor or the spring is the part that quit, the notes on an opener or a door problem are the split to read before you buy a new motor.

The emergency release is not a spring repair

The red cord, or whatever color the release handle is, disconnects the opener trolley from the door. It does not rebuild a spring. Pull it only when the door is fully closed, or when a person can actually hold the door if it is open. A weak or broken spring can let an open door fall as soon as the trolley lets go. People get hurt trying to catch that drop. If the door is open and the spring is suspect, leave the release alone and wait.

Once a sound spring is back on the shaft, the door should stay where you put it, about halfway, without the opener attached. That balance check is the technician's, done with the door under control. It is not a test to try with one hand on a panel and the other on a ladder. If the door slams shut or flies up during that check, the wind is wrong or a cable is off the drum. Either result means stop, not another turn of the cone.

What to ask before the spring is ordered

Ask whether the price conversation includes both springs on a two-spring shaft, the cables if they are frayed, and the drums if the cable has jumped. A spring that broke from rust often has a cable that has been rubbing. Replacing the coil and leaving a fuzzy cable is a short repair. Ask how they measure the old spring, and whether the new one is matched to the door weight rather than to a guess from the panel count. A heavier insulated door needs a different spring from a thin uninsulated one of the same size.

If the panels are already bent, the track is twisted, or the door is an old uninsulated sheet that Houston sun has baked for decades, a new spring on a dying door is a fair question. The page on repair or replacement is that decision, still without a dollar figure. Whoever does the work should be someone you have questioned, not the first truck that answers. The list of questions before hiring covers permits, insurance, and what a written scope should say before a winding bar comes out of the truck.