A photo would help to see what you are talking about. I had a bad ceiling once and installed new and thin sheetrock over the old.
Had bring old down water crummbled ceiling from sky line was leaking
Hello Lisa! What kind of ceiling do you have now? And how big is the area you want to replace. Is there damage to your ceiling now? Give us some more information for some great answers!
Its in mobile home. 2 long sheets had come down i put back insulation had black mold on it. Trying to put something back not to heavy.
Drywall is still the cheapest, but since a bathroom , use green board. Water resistant drywall. Just a few dollars more.
I am doing mine soon & I was thinking of beadboard
Bead board is lighter and easy to install. However, seams may need a wooden grid to cover them to dress them up.
You need to do whatever your local building code allows. Some may allow 3/4 inch tongue and groove instead of drywall, some may not. Bead board panels are probably not allowed as they would not meet the fire safety requirement. You could redo the drywall and not finish it (except for taping and mudding the seams) and then cover with bead board panels if that is the look you are after.