Extension vs. Torsion Springs in Montreal's Older Garages

The call came from an address in Rosemont, for a detached laneway garage behind a classic Montreal duplex. The description was one we hear almost daily: “loud bang from the garage, door is stuck shut.” Before we even get out of the truck, we know the odds are 9-to-1 it’s a snapped spring. And on an older build like that, it’s almost certainly a failed extension spring.

The Call We Get All the Time: The Old Laneway Extension Spring Snap We see this scenario play out across the city, from Verdun to Anjou. Older garages, particularly the narrow, single-car laneway structures built from the 1940s to the 1970s, were almost universally fitted with extension spring systems. They were cheap and simple to install. The problem is, they are also mechanically inferior and significantly more dangerous than modern torsion systems. When one of these old springs lets go, it doesn't just break; it releases years of stored kinetic energy in a fraction of a second. The “loud bang” the client hears is the sound of a heavy steel coil, stretched to its limit thousands of times, finally failing. We arrived on site within our usual 15-30 minute window, and our flat $29 service call fee covers the initial diagnosis. Sure enough, looking up at the horizontal tracks, we saw the left-side spring dangling in two pieces. The safety cable, which is supposed to contain a broken spring, had rusted through and snapped long ago. The broken end of the spring had whipped around and put a nasty dent in the homeowner's drywall. This time it was just drywall; next time it could be a car window or worse.

What Are Extension Springs? The Old-School Standard An extension spring system is easy to identify. You'll see two long, coiled springs running parallel to the horizontal tracks on either side of the door. They attach to a hangar at the back of the garage and to a pulley-and-cable system at the front. As the garage door closes, the cables pull on the springs, stretching them out. This stores potential energy. When you open the door, that stored energy is released as the springs contract, helping to lift the door's weight. It’s a simple concept, like a massive elastic band. The system relies on a lot of moving parts: four pulleys (two on the spring, two on the door frame), and long stretches of aircraft cable. Each of these is a potential failure point. The pulleys wear out, their bearings seize, and the cables can fray and snap, especially if they rub against a misaligned track. On a typical 150-pound, single-car insulated door, those springs are under immense tension. When they fail, it's never gentle.

Why Extension Springs Are a Major Safety Hazard We can't be blunt enough about this: an unsecured extension spring is one of the most dangerous components in your home. When a spring that is stretched to hold 150 pounds of force breaks, that energy has to go somewhere. The spring becomes a projectile. We have seen them punch through the 1/2-inch drywall of a garage ceiling, shatter the back window of a car parked inside, and embed themselves in wooden support beams. The only thing meant to stop this is a thin steel “safety cable” that runs through the center of the spring. The problem is, on older installations, these were often omitted to save a few dollars. In other cases, like the Rosemont job, the cable is so old and corroded from Montreal road salt dripping off the car that it offers no protection. It snaps right along with the spring. A torsion spring, by contrast, is secured to a steel shaft. When it breaks, the two pieces stay on the shaft. The door makes a loud noise and becomes heavy, but nothing goes flying across the garage. This contained failure is the single biggest reason we advocate for converting away from extension systems whenever possible.

Diagnosing a Failed Extension Spring System on a Plateau Triplex When we arrive at a job, say for a garage behind a Plateau triplex with a suspected broken spring, we have a clear diagnostic process before we touch a single tool. It's all about safety and confirming the exact point of failure.

1. First, we instruct the homeowner not to operate the opener. Trying to lift a door with a broken spring can strip the gears in the motor, turning a spring repair into a much more expensive opener replacement. We immediately pull the red emergency release cord on the opener trolley to disconnect it from the door. 2. Next, we attempt to lift the door by hand. A properly balanced door should feel like it weighs 10-15 pounds and should stay in place if you let go of it three to four feet off the ground. If the door feels like it weighs its full 150+ pounds, we know the counterbalance system is completely non-functional. 3. With the door safely on the ground, we do a visual inspection. We look at both extension springs. Often, one will have a visible gap in the coils where it has snapped. We also check the condition of the second spring; if one has failed from metal fatigue, the other is not far behind. We always replace them in pairs. We then inspect the lift cables for fraying or rust, and check the pulleys to see if they spin freely or are seized. Finally, we confirm whether safety cables are present and intact. The absence of safety cables immediately elevates the job's risk profile.

The Modern Standard: Torsion Springs Explained Walk into any newly built garage in Brossard or Saint-Laurent and you'll see a torsion spring system. Instead of two springs on the sides, there's a single heavy-duty spring (or a pair of springs for a heavy double door) mounted on a steel shaft directly above the door opening. This shaft, or “torque tube,” is held by a center bearing plate and two end bearing plates. Drums at each end of the shaft hold the lift cables, which run straight down to the bottom corners of the door. When the door closes, the cables wrap around the drums, which turns the shaft and “winds” the spring. This creates torque. When the door opens, the spring unwinds, using that torque to turn the shaft and help lift the door. The entire operation is smoother and more controlled than an extension system. It’s a balanced, engineered system, not just a brute-force stretching mechanism. The standard springs we install are rated for 10,000 to 12,000 cycles (one cycle is one open and one close), which is good for about 7-10 years of typical use. For a small premium, we can install 25,000-cycle springs, which are a smart investment for high-use families.

How a Torsion Spring Actually Fails After ~10,000 Cycles Unlike the violent snap of an extension spring, a torsion spring failure is almost boring. It's a simple case of metal fatigue. The spring wire, which might be a .250 or .2625 gauge high-tensile steel, is designed to twist and untwist a specific number of times. Every time you open or close your door, you use up one “cycle.” Once it nears the end of its rated life, a microscopic crack forms and eventually propagates through the wire. The result is a clean break. You'll hear a loud bang, similar to an extension spring, because the release of torque is still sudden. But because the spring is installed on the torque tube, the two broken pieces are contained. They can't fly off. They just sit there on the tube. The symptom for the homeowner is the same: the opener will strain but be unable to lift the door's full weight, and the door will be impossible to lift by hand. When we arrive, we see the 1-2 inch gap in the spring, confirm the wire size and length, and install a new, correctly calibrated replacement. It's a much safer failure mode by design.

The Low-Headroom Problem in Montreal's Garages Here is the main challenge with upgrading older Montreal garages: headroom. Headroom is the space between the top of the garage door opening and the ceiling (or the lowest obstruction, like a beam). A standard torsion spring installation, with the spring mounted to the wall above the door, requires about 12 inches of clear space for a normal 12-inch radius track. If you have a larger vehicle and need high-lift tracks, you might need 15 inches or more. The problem is, many laneway garages in NDG or older parts of Laval were built with minimal clearance. We often see as little as 4 to 6 inches of headroom. You simply cannot fit a standard front-mount torsion system in that space. This is why extension springs were used in the first place—they don't require any space above the door opening. Trying to force a standard torsion setup into a low-headroom situation is a common mistake made by inexperienced installers. It can cause the door to operate poorly and even damage the top section of the door as it tries to round the curve of the track.

### ### The Solution: Rear-Mount Torsion and Other Low-Headroom Kits For these tight spaces, we don't just give up and install another set of dangerous extension springs. We use a professional low-headroom torsion conversion kit. The most common and effective solution is a rear-mount torsion system. Instead of mounting the spring shaft above the door opening, we mount it at the very back of the horizontal tracks. The torque tube, springs, and drums are all located near the garage ceiling, above where your car's hood would be. This requires a longer set of cables, but it completely frees up the space above the door opening, requiring as little as 4 inches of headroom. It delivers all the safety and performance benefits of a torsion system—a balanced lift, contained failure mode—in a package designed for these older Montreal buildings. Some manufacturers, like Wayne Dalton, have offered alternative systems like the TorqueMaster, which encloses the spring inside the torque tube itself. While these are also low-headroom solutions, they are proprietary and can be more difficult to service down the road. For most conversions, a properly installed rear-mount system with standard, replaceable torsion springs offers the best long-term value and safety.

Converting from Extension to Torsion: The On-Site Process Performing a full conversion from an old extension spring system to a modern rear-mount torsion system is a precise job that takes a few hours. It’s not a DIY project. Here’s what we do on the driveway and in the garage:

1. First, with the door in the closed position, we clamp it to the tracks to prevent it from moving. We then carefully disconnect and remove the old, stretched-out extension springs. This is the most dangerous part, and requires specific tools to release the tension safely. 2. We remove all the old hardware: the four pulleys, the frayed lift cables, and the rear spring hangars. This cleans up the sides of the door and eliminates future failure points. 3. Next, we assemble the new torsion system. We mount the end bearing plates at the rear of the horizontal tracks and the spring anchor bracket in the center. We slide the new torque tube through the bearings, and then load the new spring(s) and the cable drums (a common size being a D400-8 for an 8-foot door). 4. We run new, thicker gauge aircraft cables from the bottom brackets on the door up to the new drums on the rear-mounted shaft and secure them. 5. Now comes the critical step: winding the springs. Using professional winding bars, we turn the spring a specific number of times to match the door's height and weight. A standard 7-foot high door typically requires 7.75 full rotations. This must be exact. 6. Finally, we perform a balance test. We remove the clamps, disconnect the opener, and lift the door by hand to about waist height. It should stay there. If it falls, it needs more tension; if it rises, it has too much. We fine-tune the tension until the balance is perfect, then reconnect and test the opener.

The Montreal Climate Factor: Salt, Cold, and Humidity on Springs Our climate takes a special toll on garage door hardware. The impact on springs, both extension and torsion, is significant. During winter, road salt and calcium chloride drip from your car onto the garage floor. The resulting salty slush gets kicked up or evaporates, creating a corrosive atmosphere that attacks steel springs. We see springs that should last 10 years fail in 5 or 6 in garages where a car covered in winter slush is parked every day. The protective coating on the spring wire wears away, rust pits form, and the spring snaps prematurely. The extreme cold itself is also a factor. When the temperature drops to -25°C, steel becomes less ductile and more brittle. An older, fatigued spring is much more likely to snap during a cold snap. Then there's the humidity swing. The heavy, humid air of a Montreal summer can cause a perfectly balanced door to feel heavy, while the dry winter air can make it feel light. This is why checking your door's balance seasonally is a good idea. A door that's out of balance puts constant strain on your opener, and an opener fighting a heavy door is an opener that's going to fail early.

Common Mistakes We See with Spring Replacements There’s a right way and a wrong way to do everything. With garage door springs, the wrong way is often dangerous and ends up costing more in the long run. We see the same mistakes made by homeowners attempting a DIY repair or by unqualified handymen.

• **Replacing only one spring.** Whether it's a two-spring extension system or a two-spring torsion setup on a double door, springs should always be replaced in pairs. Both springs have the same number of cycles on them. If one broke from metal fatigue, the other is on the verge of failing too. Mismatched springs also create an imbalanced lift, which will damage the door sections and the opener.
• **Installing the wrong size spring.** This is the most common error. Springs are not one-size-fits-all. They are calculated based on door height, weight, track radius, and drum size. Installing a spring that's too strong will make the door “hot,” causing it to fly open and be difficult to close. A spring that's too weak will force the opener to do all the lifting, burning out the motor.
• **Forgetting the safety cable on extension springs.** If you must keep an extension spring system, not installing a safety cable through the middle of each spring is pure negligence. It’s a simple, inexpensive part that turns a dangerous projectile into a contained break.
• **Using the wrong tools for torsion springs.** Winding a torsion spring requires a pair of solid steel winding bars that fit the winding cone sockets perfectly. We've seen people try to use screwdrivers or rebar. When these slip out of the socket under tension, the force is enough to break a wrist or cause serious facial injury.
• **Oiling the tracks or using WD-40 on rollers.** Garage door tracks should be clean and dry. Grease or oil in the tracks just attracts dirt and grit, which gums up the rollers. And WD-40 is a solvent, not a lubricant. It will strip away any real grease in the roller bearings, causing them to fail.

The guaranteed way to avoid these mistakes is to have the work done by a licensed and insured technician who uses the correct parts and procedures. All our work comes with a warranty on both labour and parts.

Balancing Cost vs. Safety: Is a Torsion Conversion Worth It? Homeowners often ask us about the cost difference. A full conversion from extension springs to a new torsion spring system is more expensive than a simple like-for-like replacement of two broken extension springs. You are paying for more hardware—the shaft, bearings, drums, and new cables—plus the additional labour to install it all. However, the comparison isn't just about the upfront price. You are buying a fundamentally safer, more reliable, and better-performing system. A torsion spring provides a much smoother and more balanced lift, which reduces the daily wear and tear on your electric opener, the rollers, and the door panels themselves. The risk of a snapped extension spring damaging your car or, worse, injuring someone, carries a potential cost that dwarfs the premium for a torsion conversion. For a high-use family garage, upgrading to a 25k or 30k high-cycle torsion spring during the conversion adds even more long-term value, potentially doubling the time before you need to think about springs again. For us, especially in the tight confines of an old city garage, the safety aspect alone makes the decision clear.

The mechanics of a torsion system are simply superior. The torque is applied evenly across the door, the lift is more stable, and the components are under less stress than in a stretching-and-pulling extension setup. When you factor in the contained, predictable failure mode, it becomes the only system we can responsibly recommend for the long-term safety and function of your garage door. It’s the professional standard for a reason.