A lot of Tualatin's garage doors went up between 1964 and 2006, with the median build year sitting around 1980, which means a big share of the original steel rollers are now pushing forty-plus years of wear on hardware nobody's touched since the house was built. Steel rollers wear differently than nylon - they don't crack, they flatten and pit, and that pitting is what you hear as grinding rather than a smooth roll. Tualatin sits in a cold, moderate climate band, and that swing between damp winter mornings and dry summer afternoons is hard on steel roller stems and bearings, since condensation sits in the bearing race overnight and then dries out, washing away whatever lubrication was left. Across the service area's roughly 130,959 households and 66,619 owner-occupied houses, roller wear is one of the most common reasons a garage door starts grinding instead of gliding, especially in the stretch of homes from the 1980s and 90s that make up most of this housing stock. It's less about any one bad part and more about original hardware finally running out of road at the same time across a lot of similar-aged houses.