Why is the plywood roof decking sagging on my new house?

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   contacting the contractor's licensing board to enforce a judgment
2. 2
   putting solar panels on to hide the damage
3. 3
   ripping off and replacing the roof sheathing

In their words

Unedited, most upvoted first, each linked to the thread it came from.