When the battens let go
Battens are often the weakest link in older houses.
Drag the slider to compare the damage with the fix.
What went wrong
The roof sheets were fixed to the battens, but the battens were only nailed down. The wind lifted them off together.
Another house looked fine from outside, but many battens had started to pull away.
The fix
Screw every batten down to each rafter. It’s one of the best value upgrades, and easiest when you reroof.