What Is Going On
Menomonee Falls homes mostly date to the 1960s and '70s, and that build era shows up differently depending on whether the garage is attached or stands alone. Detached garages from this period were often framed light, since they weren't heated and nobody expected them to hold a modern insulated door. Attached garages from the same years were tied into the house's structure, which means the door opening is more likely to have settled evenly with the foundation - but it also means any gap at the bottom lets cold air straight into a shared wall. We see this split constantly: a detached garage with a sagging track from decades of thermal movement, next door to an attached garage with a door that's fine but a bottom seal that's given up. Neither problem is dramatic on its own. Both get worse because the structures they're mounted to are now 50 to 85 years old, built to a standard nobody was writing with a modern insulated door in mind.
What the Weather Here Does to It
This is a severe cold climate, and the detached-versus-attached difference changes how that cold does damage. A detached garage has no heat source at all, so metal contracts hard every winter - tracks tighten, torsion springs lose a little tension faster, and panel seams that were fine in August can gap by January. An attached garage usually gets some residual heat through the shared wall, which softens that cycle but doesn't eliminate it. What it does instead is create condensation at the door itself, where warm air inside meets a cold steel panel, and that moisture finds every weak weld and rust spot over a winter or two. Either way, the failure mode is the same part doing the dying: springs and rollers taking the brunt of repeated contraction, just on different schedules depending on which side of the wall the cold is working from.
