Thin-skin steel double panels
These are thin-skin steel panels, usually 16x7 for a double bay, hung on galvanized torsion springs that were standard-issue hardware for that era. Thirty-plus years in, the fault pattern is predictable: the spring that came with the house is either dead or close to it, the bottom roller brackets have rusted at the weld, and the steel skin along the bottom panel has started to bow or flake where water sits after a hard rain.
