Extension to Torsion Spring Conversion in Ann Arbor, MI Onto a Torsion Bar

What you have now, and how to recognize it

Extension springs run horizontally along the tracks on both sides of the door, stretching as the door comes down. Torsion springs sit on a shaft above the opening and store energy by twisting. DASMA's guidance on one-piece doors describes the older arrangement directly: the counterbalance usually comprises extension springs attached near the bottom corners of the door, and inspectors are told to verify that the springs are contained by a secure cable running through the center of the springs. That containment cable is the tell. If it is missing on your door, a spring failure sends a length of loaded steel across the garage rather than leaving it hanging on the cable, and that alone is a reason to look at the counterbalance. The rest of the spring work is on the service index.

Why a torsion conversion is worth the money

Three concrete gains. The load moves to a shaft anchored above the opening, so the door hangs from a single balanced system instead of two independent springs that inevitably drift out of match with each other. A door balanced on a torsion shaft holds its position through the full travel, which makes the hand test meaningful and lets an opener run at a lower force. And a torsion spring can be specified by cycle rating, so the same door can be built for a longer service life instead of taking whatever the original builder fitted. The side tracks also lose the spring hardware, which frees the space along the walls that extension springs occupy.

Headroom decides whether it is possible

The measurement that governs is the clear space between the top of the opening and the ceiling or joists. A standard torsion assembly wants roughly 12 inches. Low-headroom kits use a double track and reduce that requirement, and where there is genuinely no room a wall-mount jackshaft operator driving a torsion shaft placed beside the opening becomes the answer. This is the routine obstacle on old stock. The city's own downtown housing needs assessment recorded 31.3 percent of downtown rental units as built in 1949 or earlier, and the American Community Survey table for the city puts the median year a housing unit was built at 1971, so a great many garages here were framed with no thought of a torsion tube. A 1936 Cape Cod garage of the kind documented on Gardner Avenue in Lower Burns Park is a typical measurement problem.

The header has to carry it

A torsion assembly transfers the entire counterbalance load into the wall above the door through two or three anchor points. DASMA's inspection guidance requires that torsion spring anchor pads be fastened to structurally sound load-bearing members, which on an old garage means opening up what is behind the drywall or the boards rather than trusting a nailed-on ledger. In the detached garages behind the houses of the Old West Side, the header is often a light built-up member sized for a door half the weight of a modern insulated one. Where the framing will not take it, the honest answer is to add a proper spring pad or reframe the header as part of the job, and to price that openly, rather than to fasten into whatever the drill finds.

What the conversion includes

The extension springs, pulleys, cables and their brackets come out. A shaft is sized to the opening, bearing plates and a center bracket are fixed into sound framing, springs are specified by the door's actual measured weight and the cycle life wanted, and new lift cables and drums are fitted and set. Then the door is balanced by hand before the opener is reconnected, and the operator's force and limits are reprogrammed to the changed door. The door's weight should be measured rather than estimated from a chart; a door with a replacement bottom section or an insulation kit added weighs something no chart knows. Related pages: spring repair and opener installation.