Tighter build-year clustering
Where the wider Green Bay area covers everything from 1962 through 2008, De Pere clusters tighter around that 1985 median. That matters for diagnosis: when we get a call from this area, we're not guessing between three different eras of hardware. We're mostly choosing between two - original 1980s steel doors with galvanized torsion springs sized for that era's door weight, and a smaller number of 1990s-2000s replacements with slightly different spring cycle ratings and composite-reinforced panels.

