Basement Drop Ceiling Grid Slightly Sagging

The previous owners of the house refinished the basement but cut a lot of corners. I am trying to do what I can on my own and have come to the basement drop ceiling grid. The wall angles are drooping slightly since they were mounted directly into the drywall... the drywall was installed about 3 inches higher than the topmost line of studs and the wall angles tacked into the very top of the drywall. I can't drop the entire ceiling down by 3" due to other bigger problems that would create, so I'm wondering if I have any options for tacking up the wall angles a little more securely? The only thought my dad and I could come up with would be to install 4" molding around the entire ceiling, butting it up tight against the wall angle and then nailing it into the closest available studs. Any other thoughts? to make it a bit more complicated, the sewage drain pipe runs along the longest outside wall of the basement at the very top of the drywall line and that prohibits me from installing long screws or extensive backing onto the drywall tops. Thanks.

 

Can you drop some 3/4 plywood behind the drywall to stiffen it up? I cant see how the wall angle couldn't be straightened out somehow.

 

We had hoped to be able to do that but the sewage drain pipe doesn't give me any access at all to get behind the top of the drywall. Thanks, anything else come to mind?

 

I would take the outside perimeter down... snap some chalk lines on the drywall, then staple the wall angle back on using an air stapler. Add silicone or construction adhesive to the top edge of the wall angle.... even gorilla tape would help prevent it from wiggling loose again.

 

ok, thanks for getting back to me.