Torsion vs Extension Springs: How to Tell Which You Have and How Each Works

What is the difference between torsion and extension springs?

A torsion spring twists on a steel shaft above the door, and an extension spring stretches along the track on each side of it. Both carry the weight of the door so the opener only moves a few pounds.

That one difference in where the spring sits changes how the door rides, what a break looks like, and how dangerous a failure is. Here is the comparison side by side.

Torsion springs are the modern standard on quality doors such as Garaga, Steel-Craft and Clopay, because they balance the door smoothly and keep their stored energy on a fixed shaft. Extension springs are older and lighter duty. In Ottawa you still find them on older single doors in neighbourhoods such as Vanier and Nepean. 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 do I tell which type of spring I have?

Springs on a bar across the top of the door are torsion springs, and long springs running above each ceiling track are extension springs. You can check from the floor in thirty seconds with the door closed and a flashlight.

Look for these, and do not climb up to touch anything while you do:

• Torsion. A steel shaft runs across the top of the opening, just above the door. One or two tightly wound springs sit on it, usually beside a centre bracket. A grooved cable drum sits at each end of the shaft, and a lift cable runs from each drum down to the bottom corner of the door.
• Extension. A long spring runs above each horizontal track, from a hanger near the back of the track toward the door. The front end of each spring carries a pulley with the lift cable looped around it. A thin steel cable threaded through the middle of the spring is the safety cable.
• A tube with no spring in sight. A steel tube across the top of the door with no visible coil is usually a Wayne Dalton TorqueMaster. It is a torsion system with the spring sealed inside the tube. Our guide to Wayne Dalton TorqueMaster springs and parts covers how that system differs.

Knowing the type also tells you what a break looks like. A broken torsion spring shows a gap of about two inches where the coil has split, usually after a loud bang. A broken extension spring hangs slack on its safety cable, or is missing, and the door lifts crooked. A TorqueMaster break shows nothing from the floor: the door is simply too heavy to lift.

It tells the technician what hardware to load before the truck leaves, too. Whatever the type, do not lift or run the door once a spring has broken. The door is no longer balanced.

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 weight of 130 to 350 pounds.

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. With the door fully closed, pull the release cord to disconnect the opener, then 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, storing torque. As the door opens, the spring unwinds and turns cable drums that reel in the lifting cables.

The torsion system has four working parts:

• the torsion tube or shaft across the top of the opening;
• the winding cone, where the spring’s tension is set;
• the cable drums at each end of the shaft;
• the lifting cables running down to the bottom brackets.

Because the energy lives on a fixed shaft, the door rises straight and balanced. When a torsion spring breaks, the two halves stay on the shaft instead of flying loose, which is the main reason torsion is the safer system to live with.

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.

Which torsion spring specs matter, wire size, length and wind?

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. Measuring the length of 20 coils and dividing by 20 gives 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 above the horizontal track on each side of the door, running parallel to the ceiling. It stores energy by stretching when the door closes and pulls back to help lift it. Extension springs always come in pairs, one per side.

Each spring hooks to a hanger near the back of the track, and its front end carries a pulley. The lift cable runs from the bottom corner of the door up over a fixed pulley at the top of the door frame, back around the spring’s pulley, and ties off near the front of the track. Closing the door pulls the spring’s pulley forward and stretches the spring. Opening it lets the spring pull back and lift.

Because the spring works in tension on open hooks and a moving pulley, a snapped spring can become a projectile. Every extension spring needs a safety cable threaded through its centre and anchored at both ends, so a broken spring stays on the cable.

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 many years do torsion and extension springs last? (cycle life)

A standard spring is rated for about 10,000 cycles, which lasts roughly five 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 opening the door eight or ten times a day burns through a 10,000 cycle spring in about three years. A rarely used door keeps the same spring much longer. This is the single biggest factor in spring lifespan, for torsion and extension springs alike.

A spring near the end of its life often gives warnings before it breaks. The door feels heavier by hand, it drifts during the balance test, it starts to rise crooked, or the opener strains to lift it. Rust on the coils speeds the end, because pitted wire cracks sooner.

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 near end of life, a high-cycle upgrade during the repair is usually worth the small extra cost. 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.

Why are torsion and extension springs both dangerous to service?

Both spring types hold the door’s full weight, 130 to 350 pounds, as stored energy, and every service job on them happens against that energy. They are dangerous in different ways, and neither is a homeowner job.

Torsion springs: the danger is in the winding

A torsion spring is wound tight the whole time the door is closed. Changing one means releasing that tension and putting it back at the winding cone with steel winding bars. If a bar slips, the cone cracks, or the spring is already fractured, the spring unwinds at once and throws the bar with the door’s full energy behind it.

The set screws holding the cone to the shaft, the cable drums and the bottom brackets carry the same load. The door can drop if a cable comes off its drum. Online videos make the job look quick, and the parts that go wrong are the dangerous ones.

Extension springs: the danger is the stretched spring and its cables

An extension spring is stretched tightest when the door is closed, and it stays under tension even with the door open. The hooks, pulleys and cable ends are all loaded. A spring or cable that lets go without a safety cable flies along the line of the track and across the garage.

Extension springs look simpler, so they get tried more often. They are not safer to work on. Both sides are matched to the door’s weight, so changing one alters the balance against the other, and the door can drop or rise crooked while the tension is uneven.

What is safe for you, and what to leave alone

Looking is safe. So is the balance test with the door closed and the opener disconnected, checking from the floor that each extension spring has a safety cable through it, and keeping children and pets away from a door with a broken spring. Winding, unwinding, adjusting or loosening anything on the springs, the cables or the bottom brackets is not. Stay clear and call a technician.

There is also the matching problem. The right spring is defined by four specs, with wire size 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. Let a pro handle torsion spring replacement in Ottawa and keep your hands clear of the winding cone. For the rest of the door, here is what is safe to do yourself on a garage door and what is not.

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 of 130 to 350 pounds 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 (343) 700-1077.

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. Once the door is fully down, disconnect the opener with the red release cord so the motor is not fighting the load, and leave it down until a technician arrives. Never pull that cord with the door part way up.

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. 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. 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 $275 for a single torsion spring and from $400 for a pair, installed and before HST. A service call starts at $150 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 on approved credit 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.

Book professional spring repair in Ottawa and Gatineau

If a spring has snapped, do not force 130 to 350 pounds of 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 the 90-day Done-Right Promise.

Call (343) 700-1077 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 $275 and pairs from $400, and we back every repair with our done-right guarantee. We carry both spring types on the truck across our Ottawa service areas, where cold snaps brittle springs all winter long.