Guide · Springs & balance

The half-lift test: what a heavy door is telling you

A Balance Point guide · Toronto NSW · reviewed by the people who run the test daily

Somewhere in the last year, your garage door got heavier. Not all at once, and not enough to ring anyone about, until one morning it takes both hands and a grunt, or the opener groans up its rails like it's towing something. This guide explains what actually changed, how the trade reads it in about ten seconds, and which findings mean "book it soon" versus "stop using the door today".

The door never weighed what you thought

A domestic garage door is a genuinely heavy object, from tens of kilograms for a light roller curtain to well over a hundred for a big insulated sectional. You have never lifted that weight, and neither has your opener. The spring has.

Every counterbalanced door, tilt, sectional or roller, carries a spring system tensioned to hold almost exactly the door's weight. When the balance is right, the moving door is nearly weightless in the hand: your arm, or a small electric motor, only steers it. That's the entire trick of the trade, and it's why the same door can be one-finger light in March and a two-hand struggle by September without a single visible thing changing.

Why doors go heavy

Spring steel is a consumable. Every open and close is one cycle, and springs are cycle-rated parts; the common domestic torsion spring is commonly rated around the ten-thousand-cycle mark, which a door used four times a day gets through in under a decade. As the steel fatigues it loses tension, the counterbalance drifts below the door's true weight, and the difference lands on whoever, or whatever, is lifting.

Around the western shore two local habits speed this up. Doors here work hard: on the commuter streets the door is the working front door of the house, cycled at dawn and dusk every day of the working week. And on the bay streets the air itself is a factor, because Lake Macquarie is saltwater, tidal through Swansea Channel, and hardware on the waterfront weathers faster than the same parts inland. Neither is dramatic. Both are real, and both show up early in a balance reading.

The test itself

When a technician arrives at a door, the first check needs no tools. The opener is disconnected so the door moves freely, the door is raised to about half its travel by hand, and then, carefully, it's released.

• The door holds. The spring is carrying the weight. Whatever the complaint was, the balance itself is sound.
• The door falls. The spring is under-tensioned or fatigued. The door is heavier than its counterbalance, and everything lifting it is overworking.
• The door climbs. Over-tension. Less common, and its own kind of dangerous, because the door wants to fly up and slam open.

That single reading, hold, fall or climb, sorts most garage door complaints into their true category before a panel is touched. It's the reason our repair visits start with the test even when you've told us exactly what's wrong: the door's own answer is the honest baseline for everything that follows.

And here is the line we hold: we describe this test so you understand what we're reading, not so you'll perform it. A badly out-of-balance door can fall hard from half height, and the spring behind that reading stores enough energy to cause real injury the moment anyone starts adjusting around it. If your door already tells the story, heavy, slamming, climbing, you don't need the test to know it's time. If a door won't hold, stop using it and call someone whose job it is.

The opener is hiding it from you

Openers make heavy doors invisible, for a while. A motor doesn't complain; it just works harder, and modern openers will keep dragging an out-of-balance door up its tracks well past the point a hand would have noticed. Three costs pile up quietly while it does.

First, the motor and drive gear wear at a rate they were never sized for, so the "opener failure" that eventually arrives was really a spring failure with a middleman. Second, the safety systems drift out of their assumptions: an opener's force limits and reversing behaviour are calibrated around a balanced door, which is one reason the Australian safety standard for motorised domestic doors, AS/NZS 60335.2.95, treats the drive and its safety functions as one system. A motor muscling a heavy door is operating outside the spirit of that design. Third, and most practically for this town: the day the opener finally gives up, you inherit the manual door at its worst, at full weight, usually at 6:40am.

The tell is audible. If your opener has started straining, slowing near the floor, or reversing for no reason, don't reach for a new opener first. Ask for a balance reading. It's a cheaper question with an honest answer.

What we won't tell you to do

You'll find internet videos for every repair this guide describes. We won't link them, and here's the plain reason: the energy. A wound torsion spring above a double door is holding roughly a door's worth of weight in twist. Released properly, with winding bars and a practised sequence, it's routine. Released by a slipped screwdriver, it isn't. Cables, drums and bottom brackets are under the same tension by proxy, which is why "just replacing a cable" belongs in the same category. There is no shame in a two-hand lift being the day you stop; that's the door telling you whose job the next part is.

What a repair visit actually looks like

So you book it. Here's the shape of the visit, because knowing it is half the trust. We run the test and the hardware check, door and opener together. Then you get the finding in plain words: what's worn, what's sound, what caused what. Then the call, repair or replace, with our honest recommendation and the price of the work, before any work starts. If the right answer is a re-tension and two rollers, that's what we'll say, even though it's the smallest job on the sheet. A door put back in balance is finished with the same test it started with: lifted to half, released, holding.

The words, so we're speaking the same language

Gone heavy

A door whose spring no longer carries its weight, so the difference lands on your arm or the opener. The most common finding on the patch's older doors.

Out of balance

Any mismatch between spring tension and door weight, in either direction. A door out of balance falls or climbs on the half-lift test instead of holding.

Holds at half

The pass. A door raised to half travel and released stays put, resting on its counterbalance. A door that holds at half is a door in balance.

Cycle

One full open and close. Springs are rated in cycles, not years, which is why the busiest doors on the commuter streets age fastest.

Sources and further reading

• Standards Australia, AS/NZS 60335.2.95: the Australian safety standard covering motorised garage door drives and their safety functions. The standard itself is a paid document; we cite it here so you know the safety framework exists, not to claim any particular product's compliance.
• ACCC Product Safety, garage door openers: the national recall search. Worth a look if you've inherited an older opener with the house.
• NSW Government, electrical work licensing: why any mains wiring an opener needs is a licensed electrician's job in NSW, no exceptions made on a ladder.

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Read your own door's behaviour against the findings in the balance test walk-through, or skip straight to the point: