Builder-grade steel doors remain
That means a lot of these garages still have their original builder-grade steel door - single-layer, minimal insulation, and an opener that was spec'd to the door's original weight, not whatever replaces it. The sideways moment comes when a homeowner swaps the door but keeps the old opener, or vice versa. A heavier insulated door on a 2008-era chain-drive unit sized for a hollow door will strain the motor and trip the force sensors constantly.
