I am unsure of the original cause of the problem, there was a decent size bowing down of the roof which holds water, which I am sure only compounds the problem as the extra
weight of the water bows it even further.....
From reading other forums and posts it seems like people slowly push up the ceiling so the
fiberglass can return to it's original shape then I can reinforce and
fiberglass underneath it to reinforce it, wouldn't that method help the structure of it to not bow back down....
The other alternate I have though about is getting
light weight plastic strip to reinforce it.
-Chad