Ashburn's housing stock runs from 1938 up through 2015, but the median build year sits at 1982, and most of the doors we service across the area's 31 named neighborhoods are still running builder-grade hardware from that 1980s and 90s wave. Steel rollers on ball bearings were standard on those doors, and steel doesn't age well through repeated freeze-thaw cycles - this area sits in a cold-severe climate band, and that swing between hard freeze and thaw is exactly what dries out factory grease and lets rust take hold in the bearing race.
Across the roughly 52,770 owner-occupied houses in the service area, that means a lot of identical rollers wearing out around the same age, which is part of why this is one of the calls we get steadily rather than seasonally. With a median household income of $154,734 in the area, we also see more owners choosing to upgrade to sealed nylon rollers outright rather than replace steel with steel, since the quieter ride is worth the small difference in part cost to them.
The service area runs from Brambleton five miles out to spots like Purcellville and Middleburg fifteen miles beyond that, and the same 1980s-90s builder doors show up consistently across that whole stretch, not just in any one pocket of it.