Garage Door Fell Down or Came Crashing Shut

The most common route to a door on the floor, and the one that produces the bang people describe.

Springs are consumable. Standard residential torsion springs are commonly rated around ten thousand cycles, where one cycle is a single open plus a single close, and they fail from accumulated fatigue rather than from any particular event. our call history says springs retire early in this valley, and DASMA's own entry is about the exposure a door picks up from standing open rather than about ambient heat it, which is why doors here reach the end of that number sooner than the rule of thumb suggests.

Where a spring is in its cycle when it goes is chance. Break with the door closed, and the door becomes very heavy and stays put — that's the version most people get, and it's the version our broken spring page is written around. Break with the door open, and the only thing still resisting the door's weight is the opener's drive train, which is a small nylon gear and a length of chain or belt. It does not hold, and it usually does not hold for long.

Once the door is down, there's still a broken spring above the opening with energy in whatever is left of it, and a cable arrangement that has been through a sudden unloading.

How you can tell: A visible gap in the torsion coil, a bang heard at the moment of failure, and a door that came down flat rather than twisting.

The version that produces a twisted landing rather than a flat one.

Lift cables carry the springs' effort to the door. Each one runs from a bottom corner up to a drum on the shaft. They are steel, they run under the full tension the springs hold, and they fail from corrosion, from fraying against a burred drum groove, or from being repeatedly loaded at a bad angle after a door has been running out of square.

When one goes, that corner of the door loses its support instantly while the other corner still has all of its. The door drops on one side, the sections rack hard against each other, and the rollers on the failed side are dragged sideways out of the channel. Frequently the door ends up partly down and jammed at an angle rather than flat on the floor, which is a considerably worse place for it to be.

The cable that's left is also worth understanding: it may still be under load, and a released cable can be lying across the floor with tension still in the system behind it.

How you can tell: One corner down and the other higher, a cable visibly broken or hanging, or a drum with cable unwound off it.

The one that's genuinely preventable, and the reason the warning is printed on the cord itself.

The red release cord disconnects the door from the opener's trolley so the door can be moved by hand. On a healthy door that's an ordinary thing to do — the springs are carrying the weight and the opener wasn't holding anything meaningful.

But if a spring has already broken, the situation is reversed. The counterbalance is gone, and the opener's drive train has been the only thing holding a couple of hundred pounds in the air. Pulling the cord in that state removes it deliberately. The door comes down immediately, in one piece, with nothing slowing it.

The circumstances are painfully consistent: the power is out, or the opener won't run, and someone wants to get a car out. The door is already open. Nobody thinks to check the spring first because nobody knew that was the check that mattered.

The rule that prevents it is short. Look at the spring before you pull the cord, and if the door is open and the spring has a gap, leave it open.

How you can tell: The door came down within seconds of the cord being pulled, on a door that had been sitting open and refusing to move.

This one hasn't happened yet, and it's on this page because it's the version people have a chance to act on.

A door that speeds up over the last few feet, lands hard, or shakes the wall when it closes has a counterbalance that's no longer matching its weight. Springs don't fail cleanly at a threshold; they weaken as they fatigue. The door still works. It just stops behaving like a balanced door — heavier in the hands, faster on the way down, and reluctant to hold position if you stop it partway.

Every one of those is the same information a broken spring gives you, delivered early and quietly enough that households adapt to it. We have stood in a lot of garages where somebody said the door had been slamming for months.

The check that settles it is the balance test, and it belongs on its own page. What matters here is that a slamming door is not a nuisance to live with. It's the stage before this page's headline.

How you can tell: The door accelerates near the floor, lands with a bang, feels heavy by hand, or drifts down when you stop it midway.

A door that fails while it's actually moving is a different investigation, because the load is dynamic and more things are candidates.

A cable can leave its drum while the door is running, particularly on a door that has been rising out of square for a while and spooling unevenly. A roller can climb out of the channel at the curve. A bottom bracket that has been working loose can release under the extra load of acceleration. Any of those takes support away from one corner while the door is in motion, and the door twists and comes down rather than stopping.

These often follow a period of symptoms — scraping, shuddering, a door that looked slightly crooked in the opening — which is why our chain page for this failure starts well before the fall itself.

What matters practically is that a door that failed mid-cycle rarely ends up flat on the floor. It ends up jammed, partly out of its track, and still capable of moving.

How you can tell: The failure happened while the door was travelling, and it has come to rest somewhere other than fully closed.

Worth treating separately because the instinct — get the car out — makes things worse.

When a door lands on a vehicle, the vehicle takes part of the load. The door is no longer resting on the concrete or hanging from anything; it's balanced across the car and whatever else it's touching. Backing the car out removes that support, and the rest of the door goes wherever gravity takes it, which may be onto the vehicle as it moves.

The same applies to anything else in the opening. A stack of storage, a bicycle, a trash can — if the door is resting on it, it's part of the support arrangement now.

Vehicle damage from this is normally to the roof, hood or trunk lid, and it's the kind of thing to photograph carefully before anything moves. Insurance questions belong with your insurer rather than with us; what we can supply is a clear written account of the door's condition.

The right sequence is always the same: control the counterbalance, support the door, then recover whatever is underneath.

How you can tell: Any part of the door in contact with a car or an object rather than with the floor.

Less common than a counterbalance failure and worth knowing about because it looks similar from inside the house.

The horizontal tracks are supported from the ceiling structure by hanger brackets, usually lagged into framing. The vertical tracks are fixed to the jambs. Where those fixings have been anchored into something inadequate — drywall alone, a furring strip, a jamb that has dried out badly, or framing that was never quite hit — they can pull under normal load, and the whole assembly comes away with the door still attached.

We also see this after a period of the door running badly. A door that has been binding or racking puts repeated sideways load into fixings that were only meant to carry weight, and they work loose over months.

The tell is what's still attached to the wall and ceiling. A counterbalance failure leaves the tracks in place with the door on the floor. A fixing failure leaves track hanging, brackets dangling, and often the opener rail out of line.

How you can tell: Track hanging from the ceiling, brackets pulled from the jamb or framing, or the whole assembly out of position rather than the door alone.