Two things line up against older doors in Saginaw, and neither is unique to one house - they're built into the housing stock and the weather. First, the age: most homes across the 21 named areas we work in were built in the 1960s and 70s, which means a lot of original doors and hardware are now well past their expected service life, whether or not they show it yet. Second, the climate band is cold and severe, which means every winter puts real stress on seals, springs, and steel that a milder region wouldn't see - expansion and contraction, ice at the bottom seal, springs working harder to lift a door that's picked up moisture weight. Put an aging door from that build era into that climate, year after year, and the failure isn't random - it's predictable. That's most of what we install: not a custom door for a new build, but a full replacement for a house where the original one finally gave out.