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The leaf in the overhaul bay needed two people to move it, and the maintenance log said only that it had “got heavier” over the winter. Nobody had touched the balance. That entry hides the real problem. An industrial door is never meant to feel heavy, because an industrial door counterweight system or its spring counterpart carries the weight all along.<\/p>\n

Our production team assembles every variant discussed here, and the differences show up long before the warranty does. Balance is the quiet half of every door specification. It decides whether the operator lifts a leaf or fights one, and it fails in two very different ways depending on whether springs or counterweights do the work. This page walks through how each system carries a door, how each one lets go, and what to check before the next overhaul.<\/p>\n

How a Door Stays in Balance<\/h2>\n

A counterbalance is any system that offsets the door’s own weight so that people and operators only overcome friction and small imbalances. Done right, the leaf rests anywhere along its travel and stays there. Done wrong, every component downstream pays for the difference.<\/p>\n

The first route stores energy. A torsion spring winds onto a shaft above the opening and holds mechanical energy in its twist, while an extension spring stretches along the tracks. As the door moves, the springs wind or stretch in step with it, giving the energy back on the way up. Spring selection, sizing and cycle ratings are their own discipline, covered in our industrial door springs guide<\/a>.<\/p>\n

The second route moves mass instead. In an industrial door counterweight system, weights ride in a tower or side columns and connect to the leaf through cables running over sheaves. As the door rises, the weights descend, and the two trade potential energy throughout the travel. The drive only has to beat friction.<\/p>\n

The physics of the two routes differ in one respect that matters for maintenance. A spring works by straining material, so its life is a predictable count of cycles and our own sectional door springs are rated for 30,000 of them. Weights never tire, but the cables, sheaves and guides that route them are ordinary wearing parts.<\/p>\n

Where Each Balance System Carries the Door<\/h2>\n

Springs dominate wherever a leaf travels up and back overhead. A sectional door keeps its balance hardware in the header zone above the opening, which is compact, affordable and easy to service. That is why torsion springs remain the default on sectional and standard-lift industrial doors.<\/p>\n

An industrial door counterweight system takes over where leaves grow too heavy or lift straight up. Vertical-lift hangar and industrial doors hang from cables instead. One US hangar-door manufacturer builds such systems more than 30 feet tall and 130 feet wide, with door panels rated for wind loads up to 200 mph while closed. At that scale a spring shaft would be impractical, so the counterweight tower carries the job instead, and our vertical lift door guide<\/a> shows when that configuration wins.<\/p>\n

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Vertical-lift leaves of this size hang from cables and weights, not from a spring shaft.<\/figcaption><\/figure>\n

The trade is space and money. The same manufacturer names the counterweight tower’s footprint and the cost of the weight material as the system’s main drawbacks. That is why the option appears mostly on large new builds. Springs cost no building volume but live by their cycle count, so the choice is really between buying space and buying fatigue life.<\/p>\n

Counterweights and springs balance the door; the guide to industrial door locks and handles<\/a> keeps it held there, under grades and standards.<\/p>\n

Whatever balances the door, the load still travels through rope; the guide to sectional door cable drums<\/a> explains groove matching, wear limits and pair replacement on the spring-shaft route.<\/p>\n

How Each Balance System Fails<\/h2>\n

Springs usually announce their failure. Fatigue, corrosion or a mismatch with the door’s weight ends in a fracture that often sounds like a bang. The break leaves a visible gap in the coil, and the leaf turns heavy without warning.<\/p>\n