Torsion vs Extension Springs: How a Garage Door Counterbalance Works

What is the difference between torsion and extension springs?

The difference is where the spring sits and how it stores energy. A torsion spring mounts on a steel shaft above the door opening and twists to store torque. An extension spring runs along the horizontal track beside the door and stretches when the door closes.

Both systems do the same job: they counterbalance the weight of a door that can run 130 to 220 pounds, so the opener motor or your own arm only has to move a few pounds of net weight. The mechanics differ in safety, lifespan, and how evenly they balance the door.

Torsion springs are the modern standard on quality doors such as Garaga, Steel-Craft, and Clopay because they balance the door smoothly and contain their stored energy on a fixed shaft. Extension springs are older and still common on lighter single doors, but they stretch loose across the ceiling and need safety cables. If your spring has already failed, you want same-day garage door spring repair in Ottawa, because a door with a broken spring should not be used.

How does a garage door spring counterbalance the door?

A spring counterbalances the door by storing energy that pulls upward almost exactly as hard as gravity pulls the door down. When balance is right, the door floats at any height and the opener moves only a few pounds, not the door’s full 150 pound weight.

Think of it as a tug of war that is meant to be a tie. As the door closes, you wind energy into the spring; as it opens, the spring gives that energy back to lift the panels. The cables and cable drums translate the spring’s pull into the up and down motion of the door.

This is why a broken spring is so obvious. With no counterbalance, the opener suddenly has to lift the entire weight, strains, and often gives up. You can check whether your spring still works: disconnect the opener and lift the door halfway by hand. A balanced door stays put; one that slams down or shoots up has lost tension. Always test whether your spring is still balancing the door before you blame the opener.

What is a torsion spring and how does it work?

A torsion spring is a tightly coiled spring mounted on a horizontal steel shaft, the torsion tube, above the door. It is wound to a set number of turns with winding bars, storing torque. As the door opens, the spring unwinds and turns cable drums that reel in the lifting cables.

The torsion system has a few key parts working together: the torsion tube or shaft, the winding cone where the spring is tensioned, the cable drums at each end, and the lifting cables that run down to the bottom brackets. Because the energy lives on a fixed shaft, the door rises straight and balanced.

Most double doors in Ottawa use either a single large torsion spring or a pair of smaller ones. A pair, one left-wound and one right-wound, balances the load evenly and is safer, because if one breaks the other still holds half the load. Garaga and Steel-Craft doors are factory-fitted with torsion springs sized to the exact door weight, which is why a like-for-like replacement matters.

Torsion spring specs: wire size, length, inside diameter, wind direction

A torsion spring is defined by four specs: wire size, inside diameter, length, and wind direction. Wire size usually runs 0.207 to 0.250 inch, inside diameter is typically 1 3/4 or 2 inches, length is matched to door weight, and the spring is wound either left or right.

Getting these four numbers right is the whole job. The wrong wire size or length leaves the door unbalanced and burns out the opener. Here is what each spec means:

• Wire size (0.207 in to 0.250 in): the thickness of the steel. Heavier doors need thicker wire. A measurement of 20 coils with calipers tells the installer the exact gauge.
• Inside diameter (1 3/4 in or 2 in): the bore of the coil, stamped on the winding cone. It must match the cone and shaft.
• Spring length: longer springs deliver more cycles and finer balance. This is matched to the door’s weight and height.
• Wind direction (left-wound or right-wound): on a two-spring system the left and right springs are wound opposite ways. The wind direction must match the side; getting it backward unwinds instead of lifts.

Oil-tempered wire is the common standard, while galvanized wire resists corrosion in damp garages. High-cycle springs simply use a longer, heavier spring of the same diameter to hit 25,000 to 50,000 cycles. When you book same-day garage door spring repair in Ottawa, a factory-trained technician measures all four specs on the truck so the new spring matches the door, not just the broken part.

What is an extension spring and how does it work?

An extension spring is a long coil mounted along the horizontal track on each side of the door, running parallel to the ceiling. It stores energy by stretching when the door closes and contracts to help lift it. Extension springs always come in pairs, one per side.

Unlike torsion springs, extension springs work in tension rather than torsion, and they rely on a system of pulleys and cables to translate their stretch into lift. Because a stretched spring under load can become a projectile if it snaps, every extension spring should have a safety cable threaded through its centre and anchored at both ends.

Extension springs are lighter duty and cheaper, so they show up on older single doors and lower-cost installs. The trade-offs are real: they balance the door less evenly than torsion, the door can rise crooked if one side weakens, and without intact safety cables a broken extension spring is genuinely dangerous. Many homeowners upgrading an aging door choose to upgrade to high-cycle springs with a new Garaga door and move to a torsion system at the same time.

How do I tell which type of spring I have?

Look at the area just above the closed door. If you see one or two springs wound tightly around a horizontal metal bar centred over the opening, you have torsion springs. If you see long springs stretched along the tracks on each side, parallel to the ceiling, you have extension springs.

Torsion is the centred, shaft-mounted setup; extension is the pair running front to back along the side tracks. There is a quick way to be sure: torsion springs sit on a single steel tube above the header, while extension springs each have a pulley and a cable looping back toward the rear of the track.

Knowing the type matters before you call. It tells the technician what hardware to load, and it tells you how urgent the situation is. Either way, do not lift or run the door if a spring has visibly separated into two pieces; that gap is the classic sign of a broken spring and the door is no longer balanced.

How long do garage door springs last? (cycle life)

A standard spring is rated for about 10,000 cycles, which lasts roughly seven to nine years at three to five uses a day. One full open and close is one cycle. High-cycle springs rated 25,000 to 50,000 cycles can last fifteen years or more under the same use.

Cycle life, not calendar years, is what actually wears a spring out. A household that opens the door eight or ten times a day burns through a 10,000 cycle spring in three to four years, while a rarely used door can keep the same spring much longer. This is the single biggest factor in spring lifespan.

If you want to predict when yours will fail, read how garage door cycle life determines spring lifespan and count your daily openings. When a spring is approaching end of life, upgrading to a high-cycle spring during the repair is usually worth the small extra cost, because it can double or triple the time before the next failure.

Why do garage door springs break, especially in winter?

Springs break from metal fatigue once they hit their cycle rating, and cold weather speeds it up. In Ottawa winters, steel becomes more brittle below freezing, so a tired spring that would have lasted another month often snaps on the first deep cold morning of the season.

Every cycle flexes the steel a little, and microscopic cracks grow until the wire finally separates, usually with a loud bang. Most springs are living on borrowed time by the time the cold arrives. Rust accelerates the process, because corrosion pits the wire and concentrates stress, which is why galvanized wire and a yearly spray of spring-safe lubricant help.

This is why our phone rings hardest on the coldest mornings, from Greely and Carp to the urban core. If you want the full explanation, see why garage door springs break in winter. A door that suddenly feels like dead weight on a January morning almost always has a snapped spring, not a frozen opener.

Is it safe to use a garage door with a broken spring?

No. With a broken spring there is no counterbalance, so the door’s full weight, often 150 pounds or more, falls onto the opener, the cables, and the brackets. Forcing it can snap a cable, strip the opener gear, or drop the door. Stop and call (613) 255-1968.

People are often surprised the opener still moves a door with a broken spring. It might, for a few cycles, but it is dragging the entire weight it was never designed to lift, and something else breaks next. The door can also slam shut without warning if you are running it by hand.

If you heard a bang and the door now will not open, or it opens a few inches and stops, treat it as a broken spring. Do not park under it, and do not keep hitting the wall button. Disconnect the opener with the red release cord so the motor is not fighting the load, and leave the door down until a technician arrives.

Should you repair or replace a broken spring?

If the door itself is in good shape, you replace the broken spring, you do not replace the door. On a two-spring system, replace both at once, because the second spring has the same age and cycle count and will fail soon after. Replacing one alone usually means a second service call within months.

The math is simple. Both springs in a pair were installed together and have wound the same number of cycles, so when one breaks the other is right behind it. Doing the pair together saves a second trip charge and rebalances the door correctly. A technician also checks the cables, rollers, and bearings during the visit, since a failing spring often takes those parts with it.

Replacement only enters the picture when the door is also old, dented, or poorly insulated. If you are weighing a tired door against a new one, the complete garage door maintenance guide helps you judge whether the rest of the door has life left, and an upgrade to a new Garaga door with high-cycle springs resets the whole system.

How much does garage door spring replacement cost in Ottawa?

Garage door spring replacement in Ottawa starts at $200 for a single torsion spring and from $300 for a pair, parts and labour included. A service call runs $35 to $85 and is free when it is rolled into a repair over $250. There are never overtime fees, even on weekends.

Pricing depends on the spring type, the door weight, and whether you choose a standard 10,000 cycle spring or a longer-lasting high-cycle spring. High-cycle springs add a small amount but can last two to three times longer, which makes them the better value on a door you use heavily.

For a full breakdown by spring type and door size, see garage door spring replacement cost in Ottawa. Financing is available from $89 per month if you are replacing the door at the same time. We carry the common Ottawa spring sizes on the truck, so most repairs are done same day.

Why spring replacement is not a DIY job

Spring replacement is not a DIY job because a wound torsion spring holds enough stored torque to break a wrist or worse. Winding and unwinding require proper winding bars, the correct turn count, and a way to control the shaft. A slip sends the bars flying with the door’s full energy behind them.

Online videos make it look quick, but the parts that go wrong are the dangerous ones: the winding cone can shatter, a winding bar can kick back, or the door can drop if the cables are released in the wrong order. Even getting the wire size or wind direction wrong leaves the door unbalanced and burns out the opener you were trying to protect.

There is also the matching problem. The right spring is defined by four specs measured to thousandths of an inch, and the wrong one ruins the balance. A factory-trained technician carries calipers, a chart, and the common sizes, and is covered by WSIB clearance #7421809 and Ontario business #76481 2935 RT0001. Let a pro handle same-day garage door spring repair in Ottawa and keep your hands clear of the winding cone.

Book professional spring repair in Ottawa and Gatineau

If a spring has snapped, do not force the door. HUSH Garage Door Service carries torsion and extension springs on every truck and offers same-day service seven days a week across Ottawa and Gatineau, with no overtime fees and a 90-day guarantee on the work.

Call (613) 255-1968 or book online and a factory-trained technician will measure your exact spring specs, replace the pair if needed, rebalance the door, and check the cables and rollers before leaving. Single springs start from $200 and pairs from $300, and we back every repair with our done-right guarantee. For nearby help, see our Ottawa service areas, where cold snaps brittle springs all winter long.