Alleys, tight openings and old framing
Alley garages in this part of the city are often sized for older, smaller cars, so the opening can be narrow and the headroom limited. A tight opening makes it easy to clip the door with a bumper or a mirror, which bends a track or pops a roller out. Low headroom also limits which spring and opener setups will fit.
Many of these garages were built long ago, and the walls and slab can shift. Loose track bolts, a sagging header and a floor that slopes toward the alley are all familiar sights. Trucks and delivery vans using the alley, plus the occasional tree limb after a storm, add to the list of things that knock a door out of alignment. A careful look at the framing is part of any repair here.

