With a median build year around 1957, most garages on this side of our service area were framed for a door and hardware combination that predates insulated steel sectional doors entirely. The original single wood door, often just tongue-and-groove panels on a wood frame, was never insulated and was never meant to carry the extra weight of added insulation, a heavier opener bracket, or a retrofit steel skin someone bolted over the wood decades later.
The failure we see over and over in this town isn't a broken cable from misuse - it's a torsion spring that's been quietly working overtime for years because the door it's lifting isn't the door it was sized for. Add Chicago-area cold, which stiffens grease in old bearing plates and makes brittle wood more likely to crack at the panel seams during a hard lift, and you get a spring that finally lets go on a January morning. Cold moderate winters aren't dramatic here, but they're consistent, and consistent cold on old hardware is what actually breaks things, not one bad storm.