Just got back to Michigan for the summer, and found the two lower panels of the 14’x14’ door on the eave side of the shop had the same damage on the two bottom panels. Apparently we had a lot of snow this winter and no January thaw.
Talking to the garage door dealer, he’s seen a lot of similar damage: steel roof, 16’ walls, and sudden shedding has enough kinetic energy to buckle 14’ and larger doors.
He’s out of the 14’ reinforcements, but expects more in ten days. New panels would be September, at best.
The “U” shaped reinforcements cost about $30 each, and are lighter than a hack job angle iron repair, so the door shouldn’t sag when open.