Hello.
If you've made a mistake, like I have, and built a suspended ceiling with standard plasterboards 250x90 but spaced at cc45 instead of cc30, is there a solution to prevent it from sagging over time that doesn't involve redoing it? I guess it's difficult, if not impossible, to screw through the plasterboard, where there aren't any battens, and attach to the old ceiling, without it becoming poor, cracking, bending in the other direction, etc.? Or should you just accept that it might sag over time if you don't have the energy to redo everything?