Hemlock's houses cluster around a median build year of 1969, which puts most garage doors here squarely in the same generation as the rest of this area's 1960s-70s housing stock. That matters because doors from this window were built with lighter-gauge steel and, on a lot of them, extension springs mounted along the horizontal tracks rather than the torsion setup you'd see on anything newer. Extension springs age harder - the coils stretch, the safety cables (if they were ever added) get brittle, and the whole system loses tension unevenly instead of all at once. Layer on the fact that this area sits in a cold-severe climate band, and you get a second problem stacked on the first: grease in the rollers and hinges thickens in deep cold, metal brackets contract, and a spring that was already near the end of its life gives out on the coldest morning of the year instead of a mild one. It's not that Hemlock doors fail more often than doors ten miles away - it's that the era and the winters here point to the same two failure points, springs and hardened lubrication, over and over.